Javascript - Get position of the element of the array

Question

For instance, a variable named arrayElements of array type contains [1,2,3,4].

How do i get the position of which that has the value "3" in the array variable besides using loop?

thanks.

Answer 1

consider using indexOf, it returns the 0-based position of the element in the array.

e.g.

[1,2,3,4].indexOf(3); // produces 2 

Note that this method is not available in IE 8 and below.

Answer 2

jQuery provides yout with an "inArray" functionality, similar to PHP:

var a = [1,2,3,4]; console.log( jQuery.inArray(3, a) ); //returns 2 

If you're already using jQuery in your project, this would be the way to go! jQuery uses indexOf (the fastest solution) if possible and steps back to a loop based solution if not.