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

I know this can be done using the arr.filter() method. But I prefer using the Boolean() function. Is clearer to me. Here's how I did it, although a little longer:

function bouncer(arr) {
// Don't show a false ID to this bouncer.

    var falsy;
    var trueArr = [];

    for (i = 0; i < arr.length; i++) {

        falsy =  Boolean(arr[i]);

        if (falsy === true) {

        trueArr.push(arr[i]);

        }

    }

    return trueArr;
}

bouncer([7, "ate", "", false, 9]);
// returns a new array that is filtered accordingly.