Function filter

src/filter.js:1–11

(values, test)

export default function filter(values, test) {
  if (typeof test !== "function") throw new TypeError("test is not a function");
  const array = [];
  let index = -1;
  for (const value of values) {
    if (test(value, ++index, values)) {
      array.push(value);
    }
  }
  return array;
}