js array add element at index code example
Example 1: javascript insert item into array
var colors=["red","blue"];
var index=1;
colors.splice(index, 0, "white");
Example 2: javascript add array to array at index
a1.splice(2, 0, ...a2);
Example 3: javascript push in position
var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";
console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());
Example 4: add new element by index js
const arr = [ 1, 2, 3, 4 ];
arr[5] = 'Hello, world!';
console.log(arr);
console.log(arr.length);