JSFiddle - React, Tailwind, and code Playground

by Alexey Ukolov

JavaScript

function valueIsInWhitelist (value, whitelist) {
  if (!Array.isArray(whitelist)) {
    whitelist = [].slice.call(arguments, 1);
  }

  return whitelist.indexOf(value) > -1;
}

console.log(valueIsInWhitelist(42, [13, 42, 666]));
console.log(valueIsInWhitelist(42, 13, 42, 666));
console.log(valueIsInWhitelist(1, [13, 42, 666]));
console.log(valueIsInWhitelist(1, 13, 42, 666));