arrayFuncEvery.js

"use strict";

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

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

var isEven = function(x) {
  return x % 2 === 0;
};
var a = mixedAry.every(isEven);
log(a); // false

var evenAry = [2, 14, 64, 8];

var b = evenAry.every(isEven);
log(b); // true