Change the value of an array changes original array JavaScript

Question

The following code causes both elements from id 0 to be set to -, even though I want only one to be set to -1. Am I just creating a re

Answer 1

Yes. Both valueArray and labelArray reference the same underlying array. To make a copy, use slice():

valueArray = labelArray.slice(0);

NOTE: Slice() only copies 1 level deep, which works fine for primitive arrays. If the array contains complex objects, use something like jQuery's clone(), credit @Jonathan.