How Do I Iterate Over a Range of Integers in Go?

Iterating over a Range of Integers in Go

Iterating over data structures like maps and slices is straightforward in Go, but what if you want to traverse a sequence of integers? Is there a built-in mechanism or a way to emulate something like Ruby's Range class in Go?

Range over Integers from Go 1.22

Starting with Go version 1.22 (slated for release in February 2024), you can conveniently iterate over a range of integers using the following syntax:

for i := range 10 {
    fmt.Println(i + 1) // Ranging over an integer iterates from 0 to one less than that integer.
}

Idiomatic Approach for Prior Versions of Go

For Go versions before 1.22, the traditional way to iterate over a range of integers is to construct a manual loop:

for i := 1; i <= 10; i++ {
    fmt.Println(i)
}

This loop achieves the same functionality as the range-over syntax introduced in Go 1.22.

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