Question

How to insert an element at a specific index in an array with Go

Answer 1

package main

import "fmt"

func insertAtIndex(arr []int, index int, value int) []int {
    if index < 0 || index > len(arr) {
        fmt.Println("Index out of range")
        return arr
    }
    arr = append(arr[:index], append([]int{value}, arr[index:]...)...)
    
    return arr
}

func main() {
    arr := []int{4, 9, 8, 6, 5, 7}
    index := 3
    value := 100
    
    newArr := insertAtIndex(arr, index, value)
    
    fmt.Println(newArr) 
}




/*
run:

[1 2 3 4 5 6 7 8]

*/

 

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