Run results for: Rest vs. Arguments to Array

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.16; rv:83.0) Gecko/20100101 Firefox/83.0

Browser: Firefox 83

Operating system: Mac OS X 10.16

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
rest with 10 args	7593550.0 Ops/sec
rest with 1 arg	15670710.0 Ops/sec
argsToArray with 10 args	4001229.0 Ops/sec
argsToArray with 1 arg	8999644.0 Ops/sec

Script Preparation code:

function rest(...args) {
  return function(fn) {
    return args.map(fn);
  };
}

function argsToArray() {
  const len = arguments.length;
  const args = Array(len);
  for (let i = 0; i < len; i++) {
    args[i] = arguments[i];
  }
  return function(fn) {
    return args.map(fn);
  };
}

Tests:

rest with 10 args
rest(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)(n => 2 * n);
rest with 1 arg
rest(1)(n => 2 * n);
argsToArray with 10 args
argsToArray(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)(n => 2 * n);
argsToArray with 1 arg
argsToArray(1)(n => 2 * n);

Run results for: Rest vs. Arguments to Array

Using the rest syntax (...args) versus converting arguments to an array.

rest with 10 args

rest with 1 arg

argsToArray with 10 args

argsToArray with 1 arg