


How to Insert a Value into a Go Slice at a Specific Index Without Affecting Other Elements?
Inserting a Value into a Slice at a Given Index
Question:
How can we insert a value into a specific index in a Go slice without including other elements?
Problem Description:
Suppose we have two slices, array1 and array2, and we want to insert array2[2] at array1[1]. We want to keep the rest of array1 untouched.
Background:
Earlier techniques involved using the colon operator (:), but it also includes subsequent elements. This tutorial aims to provide a comprehensive solution focused on inserting single values at a specific index.
Solution:
Using the slices.Insert Package (Go 1.21 ):
result := slices.Insert(slice, index, value)
Note: 0 ≤ index ≤ len(slice)
Using Append and Assignment
a = append(a[:index+1], a[index:]...) a[index] = value
Note: len(a) > 0 && index < len(a)
For special cases:
-
If len(a) == index, do:
a = append(a, value)
Copy after login -
If inserting at index zero and dealing with an int slice, do:
a = append([]int{value}, a...)
Copy after login
Custom Function:
func insert(a []int, index int, value int) []int { if len(a) == index { return append(a, value) } a = append(a[:index+1], a[index:]...) a[index] = value return a }
Generic Function:
func insert[T any](a []T, index int, value T) []T { ... return a }
Example:
slice1 := []int{1, 3, 4, 5} slice2 := []int{2, 4, 6, 8} slice1 = append(slice1[:2], slice1[1:]...) slice1[1] = slice2[2] fmt.Println(slice1) // [1 6 3 4 5]
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