Remove all falsy values from an array

Question

I would like to remove all falsy values from an array. Falsy values in JavaScript are false, null, 0, \"\", undefined, and NaN.

Answer 1

function bouncer(arr) {

    function filterFalse(value) {
        var a = Boolean(value);
        if (a === true) {
            return a;
        }
        return a;
    }

    function filterArray(x) {
        var y = filterFalse(x);
        if (y) {
            return true;
        } else {
            return false;
        }
    }

    var newArr = arr.filter(filterArray);
    return newArr;
}

bouncer([1, null, NaN, 2, undefined]);