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📖 100 Go Mistakes: Released!

After almost three years of work, I wanted to announce that my book, 100 Go Mistakes and How to Avoid Them, has finally been released 🎉. 100 Go Mistakes and How to Avoid Them shows you how to replace common programming problems in Go with idiomatic, expressive code. In it…

Golang

3 min read

Golang

3 min read

Dec 23, 2022

Profiling and Execution Tracing in Go

Go offers a few excellent diagnostics tools to help us get insights into how an application performs. This post focuses on the most important ones: profiling and the execution tracer. Both tools are so important that they should be part of the core toolset of any Go developer who is…

Golang

13 min read

Golang

13 min read

Nov 9, 2022

Slice length vs. capacity in Go

TL;DR: The slice length is the number of available elements in the slice, whereas the slice capacity is the number of elements in the backing array, counting from the first element in the slice. It’s pretty common for Go developers to mix slice length and capacity or not understand them…

Golang

6 min read

Golang

6 min read

Sep 28, 2022

Maps and Memory Leaks in Go

TL;DR: A map can always grow in memory; it never shrinks. Hence, if it leads to some memory issues, you can try different options, such as forcing Go to re-create the map or using pointers. When working with maps in Go, we need to understand some important characteristics of how…

Golang

6 min read

Golang

6 min read

Sep 14, 2022

Concurrency isn’t Always Faster in Go

TL;DR: To be a proficient developer, you must acknowledge that concurrency isn’t always faster. Solutions involving parallelization of minimal workloads may not necessarily be faster than a sequential implementation. Benchmarking sequential versus concurrent solutions should be the way to validate assumptions. A misconception among many developers is believing that a…

Golang

9 min read

Golang

9 min read

Aug 31, 2022

How to Write Accurate Benchmarks in Go

In general, we should never guess about performance. When writing optimizations, so many factors may come into play that even if we have a strong opinion about the results, it’s rarely a bad idea to test them. However, writing benchmarks isn’t straightforward. It can be pretty simple to write inaccurate…

Golang

11 min read

Golang

11 min read

Dec 15, 2021

When to Use Generics in Go?

Generics is a fresh addition to the language. In a nutshell, it allows writing code with types that can be specified later and instantiated when needed. However, it can be pretty easy to be confused about when to use generics and when not to. Throughout this post, we will describe…

Golang

6 min read

Golang

6 min read

Jun 23, 2021

100 Go Mistakes (2022)

In 2019, I published a post called The Top 10 Most Common Mistakes I’ve Seen in Go Projects. As the name states, it was a way to explain some of the most common mistakes made by Go developers. This post was pretty much popular (at least for me), and I…

4 min read

4 min read

Nov 20, 2020

Mechanical Sympathy in Go

A couple of months ago, I wrote a post about Go and CPU Caches: https://teivah.medium.com/go-and-cpu-caches-af5d32cc5592 Then, I wanted to extend the scope of this post. Following this idea, I had the chance to give a talk to GopherCon Turkey 2020. The topic is the following: Mechanical Sympathy in Go. I…

Software Development

2 min read

Software Development

2 min read

Mechanical Sympathy in Go

A couple of months ago, I wrote a post about Go and CPU Caches: https://teivah.medium.com/go-and-cpu-caches-af5d32cc5592

Then, I wanted to extend the scope of this post. Following this idea, I had the chance to give a talk to GopherCon Turkey 2020. The topic is the following: Mechanical Sympathy in Go.

I…

Published in solvingalgo

·Jun 27, 2020

Find the Element that Appears Once

Problem Find the only element that appears once In an unsorted array of integers, every element appears twice except for one element that appears only once. Return this element. Example: Input: a=[1, 4, 2, 4, 1, 3, 2] Output: 3 Category: Bit manipulation Video:

Programming

1 min read

Programming

1 min read

Find the Element that Appears Once

Problem

Find the only element that appears once

In an unsorted array of integers, every element appears twice except for one element that appears only once. Return this element.Example:Input: a=[1, 4, 2, 4, 1, 3, 2]
Output: 3

Category: Bit manipulation

Video:

📖 100 Go Mistakes: Released!

Profiling and Execution Tracing in Go

Slice length vs. capacity in Go

Maps and Memory Leaks in Go

Concurrency isn’t Always Faster in Go

How to Write Accurate Benchmarks in Go

When to Use Generics in Go?

100 Go Mistakes (2022)

Mechanical Sympathy in Go

Mechanical Sympathy in Go

Find the Element that Appears Once

Find the Element that Appears Once

Problem

Teiva Harsanyi