ES6 array add before last middle code example
Example 1: array insertion javascript
Array.prototype.insert = function ( index, item ) {
this.splice( index, 0, item );
};
Example 2: 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());