arrayFuncFilter.js

"use strict";

var log = function log(x) {
  console.log(x);
};

var ary = [10, 23, 4, 0, 77];

var even = function(x) {
  return x % 2 === 0;
};

var over20 = function(x) {
  return x > 20;
};

var a = ary.filter(even);
log(a); // [ 10, 4, 0 ]

var b = ary.filter(over20);
log(b); // [ 23, 77 ]