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 besi

Answer 1

Or simple use a for loop:

function getPosition(elementToFind, arrayElements) {
    var i;
    for (i = 0; i < arrayElements.length; i += 1) {
        if (arrayElements[i] === elementToFind) {
            return i;
        }
    }
    return null; //not found
}

getPosition(3, [1, 2, 3, 4]);