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Untyped constants in Go

Untyped constants in Go

Let’s start with quiz comparing two programs which differ only by single statement. Program C uses constant declaration (source code):
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Michał Łowicki
Pointer receiver methods and iteration variables

Pointer receiver methods and iteration variables

One more gotcha with re-using range clause variables.
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Michał Łowicki
Equality in Golang

Equality in Golang

Tale of comparison operators and {DeepEqual,Equal,EqualFold} methods
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Michał Łowicki
Defer statement in Golang (part I)

Defer statement in Golang (part I)

Deferred function is declared inside another function and is called when surrounding function exits — either normally or if goroutine…
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Michał Łowicki
“for” statement and its all faces in Golang

“for” statement and its all faces in Golang

In contrast to many other languages, Go doesn’t have multiple constructs for executing block of code repeatedly. There’s single statement…
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Michał Łowicki
range clause and the address of iteration variable

range clause and the address of iteration variable

(source code)
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Michał Łowicki
sync.RWMutex

sync.RWMutex

Solving readers-writers problems
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Michał Łowicki
Synchronization queues in Golang

Synchronization queues in Golang

how to use channels to write idiomatic code in Go
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Michał Łowicki
Reusable barriers in Golang

Reusable barriers in Golang

How to implement them using buffered channels
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Michał Łowicki
Tags in Golang

Tags in Golang

Declaration of struct fields can be enriched by string literal placed afterwards — tag. Tags add meta information used either by current…
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Michał Łowicki
Import declarations in Go

Import declarations in Go

Programs in Go are made up of packages. Usually package depends on other packages either those built-in into the standard library or 3rd…
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Michał Łowicki
Introduction to bufio package in Golang

Introduction to bufio package in Golang

Package bufio helps with buffered I/O. Through a bunch of examples we’ll get familiar with goodies it provides: Reader, Writer and Scanner…
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Michał Łowicki
In-depth introduction to bufio.Scanner in Golang

In-depth introduction to bufio.Scanner in Golang

Go is shipped with package helping with buffered I/O — technique to optimize read or write operations. For writes it’s done by temporary…
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Michał Łowicki
Globally unique key for context value in Golang

Globally unique key for context value in Golang

Suppose you’ve a context which is passed across many packages. Any of these packages can put there information (f.ex. something related to…
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Michał Łowicki
Making debugger in Golang (part III)

Making debugger in Golang (part III)

So far we’ve learned how to single-step ptraced process (tracee) and get some debugging info out of binary (read it here if you haven’t…
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Michał Łowicki
Making debugger in Golang (part II)

Making debugger in Golang (part II)

During the first part we’ve bootstrapped development environment and made a simple program (tracer) which stops child process (tracee) at…
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Michał Łowicki
Making debugger for Golang (part I)

Making debugger for Golang (part I)

The goal of this series is not to write full-featured debugger for Go programming language. If you’re looking for some then please take a…
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Michał Łowicki
Multi-valued expressions in Go

Multi-valued expressions in Go

Expression describes computation of value and consists of operands (identifiers, literal, another expression between parentheses, …) which…
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Michał Łowicki
Elide type in composite literals in Golang

Elide type in composite literals in Golang

Composite types are containers for other values. In Golang composite types are arrays, slices, maps and structs. Composite literals specify…
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Michał Łowicki
Interfaces in Go (part III)

Interfaces in Go (part III)

This story introduces another set of interfaces-related topics in Golang. It explains things like method expression derived from interface…
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Michał Łowicki
Interfaces in Go (part II)

Interfaces in Go (part II)

Type assertion & type switch
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Michał Łowicki
Interfaces in Go (part I)

Interfaces in Go (part I)

Interfaces make the code more flexible, scalable and it’s a way to achieve polymorphism in Golang. Instead of requiring a particular type…
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Michał Łowicki
Go code is UTF-8 encoded

Go code is UTF-8 encoded

Unicode plays quite nicely with Golang. Programmer doesn’t have to mark unicode strings in any special way:
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Michał Łowicki
Let’s say you have foo/foo.go:

Let’s say you have foo/foo.go:

and bar/bar.go:
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Michał Łowicki
Selectors in Go

Selectors in Go

Expression foo.bar can mean two things in Go. If foo is a package name then expression is a so-called qualified identifier referencing…
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Michał Łowicki
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