Remove all falsy values from an array.
Falsy values in JavaScript are false, null, 0, "", undefined, and NaN.
bouncer([7, "ate", "", false, 9]) should return [7, "ate", 9].
bouncer(["a", "b", "c"]) should return ["a", "b", "c"].
bouncer([false, null, 0, NaN, undefined, ""]) should return [].
bouncer([1, null, NaN, 2, undefined]) should return [1, 2].
function bouncer(arr) {
return arr.filter(Boolean);
}
bouncer([7, "ate", "", false, 9]);
copy from https://github.com/freeCodeCamp/freeCodeCamp/wiki/Algorithm-Falsy-Bouncer
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