Go: Range Over Function Types

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<div class="Article" data-slug="/blog/range-functions">

<h1 class="small"><a href="/blog/">The Go Blog</a></h1>


<h1>Range Over Function Types</h1>
  
  <p class="author">
  Ian Lance Taylor<br>
  20 August 2024
  </p>
  
  <h2 id="introduction">Introduction</h2>

This is the blog post version of my talk at GopherCon 2024.

Range over function types is a new language feature in the Go 1.23 release. This blog post will explain why we are adding this new feature, what exactly it is, and how to use it.

Why?

Since Go 1.18 we’ve had the ability to write new generic container types in Go. For example, let’s consider this very simple Set type, a generic type implemented on top of a map.

// Set holds a set of elements.
type Set[E comparable] struct {
    m map[E]struct{}
}
// New returns a new [Set].

func New[E c…

Get the full details here: Range Over Function Types - The Go Programming Language