Ardan Labs

Blog Posts by William Kennedy

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Getting Friendly With CPU Caches

Oct 21, 2025

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Understanding how your data structures interact with hardware is one of the most powerful ways to improve application performance. This blogpost explores how CPU caches …

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Kubernetes CPU Limits and Go

Sep 22, 2025

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Kubernetes CPU limits can look straightforward on the surface, but their impact on application performance is anything but simple. This article unpacks how Go services …

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Garbage Collection In Go : Part III - GC Pacing

Aug 26, 2025

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Go’s garbage collector is designed not only to manage memory safely but also to pace itself intelligently, striking a balance between low latency and high throughput. …

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Garbage Collection In Go : Part II - GC Traces

Jul 14, 2025

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Originally published in 2019, this article is part two of a three-part series exploring Go’s garbage collector. Though the Go runtime has continued to evolve, the …

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Garbage Collection In Go : Part I - Semantics

Jun 10, 2025

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This article was originally published in 2018, yet its core insights into Go’s garbage collection model remain highly relevant for developers today. While some …

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Scheduling In Go : Part III - Concurrency

May 12, 2025

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Although originally written in 2018, the following concepts remain essential for developers working with concurrency. This blogpost focuses on concurrency, …

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Scheduling In Go : Part II - Go Scheduler

Apr 14, 2025

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This blogpost is the second installment in a three-part series exploring the mechanics and semantics of the Go scheduler. Despite being published in 2018, the content …

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Scheduling In Go : Part I - OS Scheduler

Mar 4, 2025

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Although this blogpost was originally published in 2018, the concepts and principles discussed remain crucial for building efficient and performant multithreaded …

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Context Package Semantics In Go

Feb 10, 2025

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Although first introduced in 2014, the Context package remains a crucial component of Go programming, enabling efficient management of request-scoped data, deadlines, …

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Kubernetes Memory Limits and Go

Feb 27, 2024

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Introduction After writing the Kubernetes (K8s) CPU Limits post, I was wondering what happens when a K8s memory limit is set for the same service. I’ve been hearing at …

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Ultimate Go Tour

Jan 15, 2024

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I have always appreciated the Go Team investing time on providing the community with the Go Tour. This website is designed to help developers get started in learning the …

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Implementing Enumerations In Go

Sep 21, 2023

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Introduction Prior to coding in Go, I was writing software in C#. In C# enumerations can be declared and the associated type can be used in functions and as fields in a …

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Slices Package: Contains, Delete, and Equal

Sep 8, 2023

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Series Here are all the posts in this series about the slices package. Binary Search Clip, Clone, and Compact Compare Contains, Delete, and Equal Introduction In the last …

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Slices Package: Compare

Aug 25, 2023

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Series Here are all the posts in this series about the slices package. Binary Search Clip, Clone, and Compact Compare Contains, Delete, and Equal Introduction In the last …

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Slices Package: Clip, Clone, and Compact

Aug 18, 2023

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Series Here are all the posts in this series about the slices package. Binary Search Clip, Clone, and Compact Compare Contains, Delete, and Equal Introduction In the …

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Slices Package: Binary Search

Aug 2, 2023

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Series Here are all the posts in this series about the slices package. Binary Search Clip, Clone, and Compact Compare Contains, Delete, and Equal Introduction Go’s most …

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Rust Programming Language: Simple Game

Mar 8, 2023

with Cheikh Seck Introduction This is the first in a series of posts that will explore the Rust programming language. I am going to take the same approach I did with Go …

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Smart Contracts Using Solidity and Go: Basic Contract

Dec 21, 2022

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Introduction I made it my mission in 2022 to learn everything I could about blockchain and as the year ends, I feel like I accomplished my goal. Love it, hate it, or …

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Practical Uses Of Blockchain Technology

Jun 6, 2022

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Introduction A blockchain is an integrated solution of different computer science problems in the form of a single, append-only, publicly available, transparent, and …

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Blockchain In Go: Part IV: Fraud Detection

May 5, 2022

go training golang blockchain

Introduction In the first three posts, I explained there were four aspects of a blockchain that this series would explore with a backing implementation provided by the …

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Blockchain In Go: Part III: Redundant Storage And Consensus

Apr 19, 2022

go training golang blockchain

Introduction In the first two posts, I explained there were four aspects of a blockchain that this series would explore with a backing implementation provided by the …

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Blockchain In Go: Part II: Transaction Distribution and Synchronization

Mar 8, 2022

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Introduction In the first post, I explained there were four aspects of a blockchain that this series would explore with a backing implementation provided by the Ardan …

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Blockchain In Go: Part I: Digital Accounts, Signatures and Verification

Feb 12, 2022

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Introduction This is the first post in a series that will explore the semantics and implementation details of the Ardan blockchain project. The code is a reference …

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Generics Part 03: Struct Types and Data Semantics

Sep 29, 2020

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Series Index Generics Part 01: Basic Syntax Generics Part 02: Underlying Types Generics Part 03: Struct Types and Data Semantics Introduction In the previous post, I …

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Generics Part 02: Underlying Types

Aug 18, 2020

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Changes The draft is a living document which means these posts will need to change over time. This section documents when changes have taken place to this post. 21/08/20 …

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Generics Part 01: Basic Syntax

Jul 23, 2020

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Changes The draft is a living document which means these posts will need to change over time. This section documents when changes have taken place to this post. 21/08/20 …

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Dgraph Database Semantics

Jun 26, 2020

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Introduction In this paper written by Manish Jain (the founder of Dgraph) he describes Dgraph as: a distributed graph database which provides horizontal scalability, …

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Dgraph, GraphQL, Schemas, and CRUD

May 15, 2020

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Introduction In most of the reviews for this post, I was asked why choose a graph database over something else? This is a hard question to answer since my experience …

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Getting Started With Dgraph and GraphQL+-

Apr 16, 2020

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Introduction I have spent a career building business applications that work with databases, starting with SQL and then moving to No-SQL. I’ve been curious how Graph …

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Modules Part 06: Vendoring

Apr 13, 2020

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Series Index Why and What Projects, Dependencies and Gopls Minimal Version Selection Mirrors, Checksums and Athens Gopls Improvements Vendoring Introduction It’s no …

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Modules Part 04: Mirrors, Checksums and Athens

Feb 10, 2020

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Series Index Why and What Projects, Dependencies and Gopls Minimal Version Selection Mirrors, Checksums and Athens Gopls Improvements Vendoring Introduction One of the …

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Modules Part 03: Minimal Version Selection

Dec 18, 2019

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Series Index Why and What Projects, Dependencies and Gopls Minimal Version Selection Mirrors, Checksums and Athens Gopls Improvements Vendoring Introduction Every …

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Modules Part 02: Projects, Dependencies and Gopls

Dec 2, 2019

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Series Index Why and What Projects, Dependencies and Gopls Minimal Version Selection Mirrors, Checksums and Athens Gopls Improvements Vendoring Introduction Modules is …

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Modules Part 01: Why And What

Oct 10, 2019

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Series Index Why and What Projects, Dependencies and Gopls Minimal Version Selection Mirrors, Checksums and Athens Gopls Improvements Vendoring Introduction Modules …

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Caddy Partnership With Light Code Labs

Jul 22, 2019

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Ardan Labs (a leader in building Go enterprise software) is excited to announce that we have partnered with Light Code Labs and Matt Holt to bring Caddy into the Ardan …

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An Open Letter To The Go Team About Try

Jul 1, 2019

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“Once a language gets complex enough, programming in it is more like carving out a subset from an infinite sea of features, most of which we’ll never learn. Once a …

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Ultimate Go Service

Jun 27, 2018

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Introduction I teach a class called Ultimate Go. The class is three days long and teaches you the history, mechanics and semantics of the Go programming language. The …

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Bounds Check Elimination In Go

Apr 28, 2018

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Introduction One day I was talking to Damian Gryski in Slack about some performance improvements he made to his go-metro package. When I first looked at the changes I was …

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Interface Values Are Valueless

Mar 23, 2018

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Introduction I’ve been seeing a lot of question about interfaces lately on Slack. Most of the time the answers are technical and focus on implementation details. …

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Focus On Being Precise

Feb 20, 2018

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Introduction I was guided for many years to write functions that are generalized and to create layers upon layers of abstraction so things don’t break as business …

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Escape-Analysis Flaws

Jan 22, 2018

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Prelude It will be helpful to read this four-part series first on escape analysis and data semantics. Details on how to read an escape analysis report and pprof output …

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The Behavior Of Channels

Oct 24, 2017

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Introduction When I started to work with Go’s channels for the first time, I made the mistake of thinking about channels as a data structure. I saw channels as a queue …

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Interface Semantics

Jul 15, 2017

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Prelude If you want to put this post in some better context, I suggest reading the following series of posts, which lay out some other fundamental and relevant design …

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For Range Semantics

Jun 27, 2017

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Prelude These are good posts to read first to better understand the material presented in this post: Index of the four part series: Language Mechanics On Stacks And …

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Design Philosophy On Data And Semantics

Jun 8, 2017

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Prelude This is the final post in a four part series discussing the mechanics and design behind pointers, stacks, heaps, escape analysis and value/pointer semantics in …

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Language Mechanics On Memory Profiling

Jun 1, 2017

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Prelude This is the third post in a four part series that will provide an understanding of the mechanics and design behind pointers, stacks, heaps, escape analysis and …

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Language Mechanics On Escape Analysis

May 26, 2017

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Prelude This is the second post in a four part series that will provide an understanding of the mechanics and design behind pointers, stacks, heaps, escape analysis and …

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Language Mechanics On Stacks And Pointers

May 18, 2017

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Prelude This is the first post in a four part series that will provide an understanding of the mechanics and design behind pointers, stacks, heaps, escape analysis and …

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Design Philosophy On Logging

May 10, 2017

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Prelude This post is part of a series designed to make you think about your own design philosophy on different topics. If you haven’t read the following post yet, please …

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Package Oriented Design

Feb 24, 2017

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Updated on February 28th, 2017 Prelude This post is part of a series of posts designed to make you think about your own design philosophy on different topics. If you …

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Design Philosophy On Packaging

Feb 20, 2017

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Prelude This post is part of a series of posts designed to make you think about your own design philosophy on different topics. If you haven’t read this post yet, please …

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Design Philosophy On Integrity

Feb 7, 2017

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Updated on February 10th, 2017 Prelude This post is part of a series of posts designed to make you think about your own design philosophy on different topics. If you …

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Develop Your Design Philosophy

Jan 31, 2017

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Prelude This post is part of a series of posts designed to make you think about your own design philosophy on different topics. I will not be laying out direct examples …

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Video: Design Philosophy in Go

Dec 5, 2016

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This is a talk that I gave at the Vancouver Meetup on November 29th, 2016. The talk covers topics around developing your own design philosophy with a focus on decoupling …

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Application Focused API Design

Nov 3, 2016

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“I think it’s ok to do heinous stuff to test an API if it makes it more usable by others.” - Nate Finch Prelude If you are new to Go, it might help to read these …

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Avoid Interface Pollution

Oct 21, 2016

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Introduction Interfaces should only be used when their added value is clear. I see too many packages that declare interfaces unnecessarily, sometimes just for the sake of …

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Reducing Type Hierarchies

Oct 9, 2016

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Introduction I see a lot of developers coming to Go from object oriented programming languages such as C# and Java. Because these developers have been trained to use type …

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Installing Go And Your Workspace

May 12, 2016

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Introduction If you are new to Linux or the Mac you might find installing Go to be a bit confusing. It was for me when I started learning Go. Go was the reason I stopped …

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Copying Interface Values In Go

May 5, 2016

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I am constantly thinking about the Go language and how things work. Lately I have been thinking how everything in Go is by value. We see this when we pass values to …

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Composition with Go

Sep 13, 2015

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Composition goes beyond the mechanics of type embedding. It’s a paradigm we can leverage to design better APIs and to build larger programs from smaller parts. It …

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Object Oriented Programming Mechanics

Mar 15, 2015

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Go is an object oriented programming language. It may not have inheritance, but in this 20 minute video from the Bangalore meetup, I will show you how object oriented …

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Scheduler Tracing In Go

Feb 23, 2015

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Introduction One of the things I love about Go is the profiling and debug information you can generate. There is a special environmental variable named GODEBUG that will …

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Stack Traces In Go

Jan 11, 2015

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Introduction Having some basic skills in debugging Go programs can save any programmer a good amount of time trying to identify problems. I believe in logging as much …

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Using Pointers In Go

Dec 16, 2014

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Introduction I am asked quite a bit about when and when not to use pointers in Go. The problem most people have, is that they try to make this decision based on what they …

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Error Handling In Go, Part II

Nov 10, 2014

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Introduction In part I of this post, we learned about the error interface and how the standard library provides support for creating error interface values via the errors …

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Error Handling In Go, Part I

Oct 13, 2014

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Introduction It is idiomatic in Go to use the error interface type as the return type for any error that is going to be returned from a function or method. This interface …

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Go Compiler nil Pointer Checks

Sep 1, 2014

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Introduction I was thinking about how the compiler looks to protect the code we write when it can. Invalid memory access checks are one type of safety check the compiler …

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ALS Ice Bucket Challenge - Go Style

Aug 30, 2014

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If you have not heard about the ALS Ice Bucket Challenge I would be surprised. It’s everywhere nowadays, being done by celebrities alike. After being challenged by …

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Ice Cream Makers and Data Races Part II

Jun 27, 2014

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Introduction Dave Cheney published a post called Ice Cream Makers and Data Races. The post showed an example of an interesting data race that can occur when using an …

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Actionable Data With MongoDB and Go

Jun 25, 2014

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Introduction If you are building any kind of application for a consumer based product, it is common to have large amounts of application data being generated about your …

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Pitfalls With Closures In Go

Jun 20, 2014

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Introduction Closures in Go are a very powerful construct but they can also be the cause of bugs if you don’t understand how they work. In this post I am going to pull a …

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Methods, Interfaces and Embedded Types in Go

May 3, 2014

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Introduction My business partner Ed asked me what would happen if a struct and an embedded field both implemented the same interface. We asked ourselves two questions: …

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Introduction To Numeric Constants In Go

Apr 6, 2014

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Introduction One of the more unique features of Go is how the language implements constants. The rules for constants in the language specification are unique to Go. They …

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Exported/Unexported Identifiers In Go

Mar 15, 2014

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Introduction One of the first things I learned about in Go was using an uppercase or lowercase letter as the first letter when naming a type, variable or function. It was …

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Web Form Validation And Localization In Go

Mar 7, 2014

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Introduction As I improve my knowledge and framework for a Go based web service I am building, I continue to go back and enhance my Beego Sample App. Something I just …

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Running MongoDB Queries Concurrently With Go

Feb 25, 2014

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If you are attending GopherCon 2014 or plan to watch the videos once they are released, this article will prepare you for the talk by Gustavo Niemeyer and Steve Francia. …

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The Nature Of Channels In Go

Feb 17, 2014

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Introduction In my last post called Concurrency, Goroutines and GOMAXPROCS, I set the stage for talking about channels. We discussed what concurrency was and how …

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Concurrency, Goroutines and GOMAXPROCS

Jan 29, 2014

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Introduction When new people join the Go-Miami group they always write that they want to learn more about Go’s concurrency model. Concurrency seems to be the big …

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Decode JSON Documents In Go

Jan 21, 2014

go Training golang

Introduction We are working on a project where we have to make calls into a web service. Many of the web calls return very large documents that contain many …

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Be Selected To Attend GopherCon 2014

Jan 16, 2014

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Gopher Academy announced a great program today. Today I’d like to announce the GopherCon Scholarship Program. It’s goal is to increase the visibility of women …

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Go Package Management For 2014

Jan 16, 2014

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Introduction In October 2013 I sent out a call to action to the Go community. I wanted to form a group of Gophers that would come together and help write a specification …

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Macro View of Map Internals In Go

Dec 31, 2013

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Introduction There are lots of posts that talk about the internals of slices, but when it comes to maps, we are left in the dark. I was wondering why and then I found the …

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Queue Your Way To Scalability

Dec 20, 2013

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Introduction The first thing I did when I started programming in Go was begin porting my Windows utilities classes and service frameworks over to Linux. This is what I …

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Three-Index Slices in Go 1.2

Dec 17, 2013

go Training golang

With the release of Go 1.2, slices gained the ability to specify the capacity when performing a slicing operation. This doesn’t mean we can use this index to extend …

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Sample Web Application Using Beego and Mgo

Dec 11, 2013

go Training golang

Introduction I am very excited about the Beego web framework. I wanted to share with you how I use the framework to build real world web sites and web services. Here is a …

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Building A Weather App Using Go

Dec 10, 2013

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At Ardan Studios we have spent the last 6 months, in our spare time and on weekends, building a consumer based mobile application called OutCast. The mobile application …

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Write Your Go Programs Using GEdit

Nov 23, 2013

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This is a guest post from Tad Vizbaras from Etasoft in South Florida. There are a number of editors and IDEs for Go development. LiteIde, Vim, Emacs and GEdit just to …

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Label Breaks In Go

Nov 21, 2013

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Have you ever found yourself in this situation. You have a case statement inside of a for loop and you would like to break from both the case and for statements in a …

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Using The Log Package In Go

Nov 5, 2013

go Training golang

Linux is unique to Windows in many ways, and writing programs in Linux is no exception. The use of standard out, standard err and null devices is not only a good idea but …

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Using XSLT With Go

Nov 3, 2013

go Training golang

I am working on a project that requires pulling and processing different XML feeds from the web and storing the data into MongoDB as JSON. Since new feeds come up …

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Manage Dependencies With GODEP

Oct 26, 2013

go Training golang

Introduction If you are using 3rd party packages, (packages that you don't own or control), you will want a way to create a reproducible build every time you build your …

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My Channel Select Bug

Oct 17, 2013

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I was testing new functionality on a program that is already running in production when suddenly the code behaved very badly. What I saw shocked me and then it became …

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Functions and Naked Returns In Go

Oct 10, 2013

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In Go values that are returned from functions are passed by value. Go gives you some nice flexibility when it comes to returning values from a function. Here is a simple …

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Cross Compile Your Go Programs

Oct 2, 2013

go Training golang

Introduction In my post about building and running programs in Iron.Io, I needed to switched over to my Ubuntu VM to build linux versions of my test programs locally. I …

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Go Package Management Call To Action

Oct 1, 2013

go Training golang

Nathan Youngman, with the help of others, has produced this document outlining months of research and discovery. I would appreciate everyone to honestly read it before …

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Detecting Race Conditions With Go

Sep 26, 2013

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I always find it interesting when I realize that something I have been practicing or dealing with for a long time has a name. This time it happens to be race conditions. …

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Recursion And Tail Calls In Go

Sep 26, 2013

go Training golang

This article was written for and published by Gopher Academy I was looking at a code sample that showed a recursive function in Go and the writer was very quick to state …

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Iterating Over Slices In Go

Sep 23, 2013

go Training golang

Slices are used everywhere in my code. If I am working with data from MongoDB, it is stored in a slice. If I need to keep track of a collection of problems after running …

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Pool Go Routines To Process Task Oriented Work

Sep 14, 2013

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After working in Go for some time now, I learned how to use an unbuffered channel to build a pool of goroutines. I like this implementation better than what is …

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Slices of Slices of Slices in Go

Sep 10, 2013

go Training golang

I am working on building code to load polygons for the different Marine Forecast areas in the United States. These polygons need to be stored in MongoDB and there is a …

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Running Go Programs In IronWorker

Sep 7, 2013

go Training golang

Introduction Iron.io has a product called IronWorker which provides a task oriented Linux container that you can run your programs inside. If you are not sure what I …

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Timer Routines And Graceful Shutdowns In Go

Sep 4, 2013

go Training golang

In my Outcast data server I have several data retrieval jobs that run using different go routines. Each routine wakes up on a set interval. The most complex job is the …

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Using CGO with Pkg-Config And Custom Dynamic Library Locations

Aug 31, 2013

go Training golang

Earlier in the month I wrote a post about using C Dynamic Libraries in Go Programs. The article built a dynamic library in C and created a Go program that used it. The …

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Organizing Code to Support Go Get

Aug 28, 2013

go Training golang

For those of you who are like me, trying to learn the Mac and Linux operating systems, Golang programming and deployment constructs all at the same time, I feel your …

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Collections Of Unknown Length in Go

Aug 26, 2013

go Training golang

If you are coming to Go after using a programming language like C# or Java, the first thing you will discover is that there are no traditional collection types like List …

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Using C Dynamic Libraries In Go Programs

Aug 20, 2013

go Training golang

My son and I were having fun last weekend building a console based game in Go. I was recreating a game from my youth, back when I was programming on a Kaypro II. I loved …

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Understanding Slices in Go Programming

Aug 15, 2013

go Training golang

Since I started programming in Go the concept and use of slices has been confusing. This is something completely new to me. They look like an array, and feel like an …

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Using Time, Timezones and Location in Go

Aug 8, 2013

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I ran into a problem today. I was building code to consume NOAA’s tide station XML document and quickly realized I was in trouble. Here is a small piece of that XML …

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Gustavo's IEEE-754 Brain Teaser

Aug 5, 2013

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Back in June, Gustavo Niemeyer posted the following question on his Labix.org blog: Assume uf is an unsigned integer with 64 bits that holds the IEEE-754 representation …

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An RSS Feed Searching Framework Using Go

Jul 29, 2013

go Training golang

This article was written for and published by Safari Books Online Back in May, I finally decided that it was time to move away from the Microsoft stack to Linux. The cost …

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An Open Source Debate

Jul 27, 2013

go Training golang

This article was written for and published by Safari Books Online If you read my article titled Analyze Data With MongoDB and Go, then you will understand the context of …

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Understanding Pointers and Memory Allocation

Jul 27, 2013

go Training golang

In the documentation provided by the Go language team you will find great information on pointers and memory allocation. Here is a link to that documentation: …

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Analyze Data With MongoDB and Go

Jul 24, 2013

go Training golang

This article was written for and published by Safari Books Online My company is building a mobile application called Outcast. The idea behind Outcast is to give people …

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OSCON 2013 - The Gophers Are Coming

Jul 20, 2013

go Training golang

On June 22nd through the 26th, Portland Oregon is hosting OSCON (Open Source Convention). The event is run by O’Reilly. After looking at the speakers list it …

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Understanding Type in Go

Jul 12, 2013

go Training golang

When I was coding in C/C++ it was imperative to understand type. If you didn’t, you would get into a lot of trouble with both the compiler and running your code. …

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Object Oriented Programming in Go

Jul 10, 2013

go Training golang

Someone asked a question on the forum today on how to gain the benefits of inheritance without embedding. It is really important for everyone to think in terms of Go and …

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Singleton Design Pattern in Go

Jul 6, 2013

go Training golang

Multi-threaded applications are very complicated, especially when your code is not organized and consistent with how resources are accessed, managed and maintained. If …

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How Packages Work in Go

Jul 5, 2013

go Training golang

Since I started writing code in Go it has been a mystery to me how best to organize my code and use the package keyword. The package keyword is similar to using a …

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Running Go Programs as a Background Process

Jun 24, 2013

go Training golang

I have been writing Windows services in C/C++ and then in C# since 1999. Now that I am writing server based software in Go for the Linux OS I am completely lost. What is …

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Reading XML Documents in Go

Jun 17, 2013

go Training golang

I was really surprised how easy it was to read an XML document using the encoding/xml package that comes with the standard library. The package works by defining structs …

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Send an email in Go with smtp.SendMail

Jun 13, 2013

go Training golang

I wanted to send an email from my TraceLog package when a critical exception occurred. Fortunately Go’s standard library has a package called smpt which can be …

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Go's time.Duration Type Unravelled

Jun 11, 2013

go Training golang

I have been struggling with using the Time package that comes in the Go standard library. My struggles have come from two pieces of functionality. First, trying to …

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Understanding Defer, Panic and Recover

Jun 8, 2013

go Training golang

I am building my TraceLog package and it is really important that the package logs any internal exceptions and prevents panics from shutting down the application. The …

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Documenting Go Code With Godoc

Jun 5, 2013

go Training golang

As you know if you read my blog, I have been building a set of new utility packages so I can start developing an application server I need for a new project. I am brand …

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Installing Go, Gocode, GDB and LiteIDE

Jun 2, 2013

go Training golang

Check out my new installtion document: https://www.ardanlabs.com/blog/2016/05/installing-go-and-your-workspace.html I removed the sections about gocode and GDB. These are …

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Thread Pooling in Go Programming

May 31, 2013

go Training golang

After working in Go for some time now, I learned how to use an unbuffered channel to build a pool of goroutines. I like this implementation better than what is …

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Why Go Programming

May 31, 2013

go Training golang

For the past 20 years I have been writing server based and application software on the Microsoft stack. First in C/C++ leveraging the Win32 API and then in C# when .Net …

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