eq to any in JavaScript

gistfile1.js

function eqToAny (el /*, args */) {
  var args = [].slice.call(arguments, 1);
  if (args.length == 0) return false;
  for (var i = 0, l = args.length; i < l; i++) {
    if (el === args[i]) {
      return true;
    }
  }
  return false;
}

var a = 1;
var b = 2;
var c = 3;
var d = 1;

console.log(eqToAny(a, b, c, d)); // true