Run results for: Array type test comparison

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:70.0) Gecko/20100101 Firefox/70.0

Browser: Firefox 70

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
instanceof	79420120.0 Ops/sec
isArray	77979000.0 Ops/sec
Symbol.iterator	53083508.0 Ops/sec

Script Preparation code:

var types = {
  array: [1,2,3],
  number: 123,
  string: '123',
  map: new Map([[1,1],[2,2],[3,3]]),
  set: new Set([1,2,3]),
  buffer: new ArrayBuffer([1,2,3]),
  boolean: true,
  arrow: () => {},
  function: function () {},
  object: {},
  u8: new Uint8Array(),
  u16: new Uint16Array(),
  u32: new Uint32Array(),
  i8: new Int8Array(),
  i16: new Int16Array(),
  i32: new Int32Array()
}

Tests:

instanceof
const t1 = types.array instanceof Array const t2 = types.object instanceof Array
isArray
const t1 = Array.isArray(types.array) const t2 = Array.isArray(types.object)
Symbol.iterator
const t1 = types.array[Symbol.iterator] !== undefined const t2 = types.object[Symbol.iterator] !== undefined

Run results for: Array type test comparison

instanceof

isArray

Symbol.iterator