arr.splice(index, 0, item);
//explanation:
inserts "item" at the specified "index",
deleting 0 other items before itmyArray.splice(index, 0, item);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());var arr = [];
arr[0] = "Apple";
arr[1] = "Grape";
arr[2] = "Pear";
arr[3] = "Peach";
arr[4] = "Grapefruit";
console.log(arr.join()); // Apple,Grape,Pear,Peach,Grapefruit
arr.splice(2, 0, "Orange");
console.log(arr.join()); // Apple,Grape,Orange,Pear,Peach,Grapefruitconst numbers = ['one', 'two', 'four', 'five']
numbers.splice(2, 0, 'three'); // one,two,three,four,five