// +build OMIT // Copyright 2013 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package main import ( "fmt" ) // Insert inserts the value into the slice at the specified index, // which must be in range. // The slice must have room for the new element. func Insert(slice []int, index, value int) []int { // Grow the slice by one element. slice = slice[0 : len(slice)+1] // Use copy to move the upper part of the slice out of the way and open a hole. copy(slice[index+1:], slice[index:]) // Store the new value. slice[index] = value // Return the result. return slice } func main() { slice := make([]int, 10, 20) // Note capacity > length: room to add element. for i := range slice { slice[i] = i } fmt.Println(slice) slice = Insert(slice, 5, 99) fmt.Println(slice) // OMIT }