arr.splice(index, 0, item); //explanation: inserts "item" at the specified "index", deleting 0 other items before it
myArray.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());