Eloquent JavaScript 0503 Everything.js https://eloquentjavascript.net/05_higher_order.html#i_SmbRSAd5GA

Eloquent JavaScript 0503 Everything.js

/*
function every(array, test) {
  // Your code here.
  for (let elem of array) {
    if (!test(elem)) return false;
  }
  return true;
}
*/

function every(array, test) {
  // Your code here.
  return !array.some((elem) => !test(elem));
}

console.log(every([1, 3, 5], n => n < 10));
// → true
console.log(every([2, 4, 16], n => n < 10));
// → false
console.log(every([], n => n < 10));
// → true