insert-at - exercise in es5

insert-at.js

// 4 Aug 2019
// prompted by
// https://www.linkedin.com/posts/sifat-haque-9a3028b1_javascript-simpleabrjavascript-coding-activity-6561302165493780480-6A1F
// Here is an way to insert a new item to an Object at any specific position. 

function insertAt(obj, key, value, at) {
  if (Array.isArray(obj)) {
    var a = obj.slice();
    
    at === +at ? a.splice(at, 0, value) : a[at] = value;
    
    return a;
  }
  
  var newObj = {};
  var keys = Object.keys(obj);
  
  keys.splice(at, 0, key);
  
  keys.forEach(function(k) {
    newObj[k] = k === key ? value : obj[k];
  });
  
  return newObj;
}

// objects

var o = { 'q': 'bert', 'a': 'way'}

console.log( insertAt(o, 'x', 'x', 1) );
console.log( insertAt(o, 'email', 'something', 1) );

// Arrays

var a = ['3', 'b', 0 ];

console.log( insertAt(a, 1, 'one', 1) ) // index
console.log( insertAt(a, '1', 'dafs', 'candy') ); // prop