Replace element at specific position in an array without mutating it

Question

How can the following operation be done without mutating the array:

let array = [\'item1\'];
console.log(array); // [\'item1\']
array[2] = \'item2\'; // array is         


        

Answer 1

var list1 = ['a','b','c'];
var list2 = list1.slice();
list2.splice(2, 0, "beta", "gamma");
console.log(list1);
console.log(list2);

Is this what you want?