Go Keyword range

From NovaOrdis Knowledge Base
Jump to navigation Jump to search

Internal

Overview

range keyword is used to iterate over arrays, slices, maps and variadic function arguments. It returns two values. On the first position is the index/kyes, and the second position is the value.

Note that only a first identifier is declared, that is the index and not the value, as the intuition would suggest. See examples below:

Iterating over Indices

var a [5]int
for i := range a {
   // i is the index
}

Iterating over Values

var a [5]int
for _, value := range a {
   // 'value' is the value
}

Iterating over Indices and Values

var a [5]int
for i, value := range a {
   // i is the index
   // 'value' is the value
}