jonschlinkert/kind-of

$ npm install --save kind-of

const kindOf = require('kind-of');

kindOf(undefined);
//=> 'undefined'

kindOf(null);
//=> 'null'

kindOf(true);
//=> 'boolean'

kindOf(false);
//=> 'boolean'

kindOf(new Buffer(''));
//=> 'buffer'

kindOf(42);
//=> 'number'

kindOf('str');
//=> 'string'

kindOf(arguments);
//=> 'arguments'

kindOf({});
//=> 'object'

kindOf(Object.create(null));
//=> 'object'

kindOf(new Test());
//=> 'object'

kindOf(new Date());
//=> 'date'

kindOf([1, 2, 3]);
//=> 'array'

kindOf(/foo/);
//=> 'regexp'

kindOf(new RegExp('foo'));
//=> 'regexp'

kindOf(new Error('error'));
//=> 'error'

kindOf(function () {});
//=> 'function'

kindOf(function * () {});
//=> 'generatorfunction'

kindOf(Symbol('str'));
//=> 'symbol'

kindOf(new Map());
//=> 'map'

kindOf(new WeakMap());
//=> 'weakmap'

kindOf(new Set());
//=> 'set'

kindOf(new WeakSet());
//=> 'weakset'

kindOf(new Int8Array());
//=> 'int8array'

kindOf(new Uint8Array());
//=> 'uint8array'

kindOf(new Uint8ClampedArray());
//=> 'uint8clampedarray'

kindOf(new Int16Array());
//=> 'int16array'

kindOf(new Uint16Array());
//=> 'uint16array'

kindOf(new Int32Array());
//=> 'int32array'

kindOf(new Uint32Array());
//=> 'uint32array'

kindOf(new Float32Array());
//=> 'float32array'

kindOf(new Float64Array());
//=> 'float64array'

# arguments (32 bytes)
  kind-of x 17,024,098 ops/sec ±1.90% (86 runs sampled)
  lib-type-of x 11,926,235 ops/sec ±1.34% (83 runs sampled)
  lib-typeof x 9,245,257 ops/sec ±1.22% (87 runs sampled)

  fastest is kind-of (by 161% avg)

# array (22 bytes)
  kind-of x 17,196,492 ops/sec ±1.07% (88 runs sampled)
  lib-type-of x 8,838,283 ops/sec ±1.02% (87 runs sampled)
  lib-typeof x 8,677,848 ops/sec ±0.87% (87 runs sampled)

  fastest is kind-of (by 196% avg)

# boolean (24 bytes)
  kind-of x 16,841,600 ops/sec ±1.10% (86 runs sampled)
  lib-type-of x 8,096,787 ops/sec ±0.95% (87 runs sampled)
  lib-typeof x 8,423,345 ops/sec ±1.15% (86 runs sampled)

  fastest is kind-of (by 204% avg)

# buffer (38 bytes)
  kind-of x 14,848,060 ops/sec ±1.05% (86 runs sampled)
  lib-type-of x 3,671,577 ops/sec ±1.49% (87 runs sampled)
  lib-typeof x 8,360,236 ops/sec ±1.24% (86 runs sampled)

  fastest is kind-of (by 247% avg)

# date (30 bytes)
  kind-of x 16,067,761 ops/sec ±1.58% (86 runs sampled)
  lib-type-of x 8,954,436 ops/sec ±1.40% (87 runs sampled)
  lib-typeof x 8,488,307 ops/sec ±1.51% (84 runs sampled)

  fastest is kind-of (by 184% avg)

# error (36 bytes)
  kind-of x 9,634,090 ops/sec ±1.12% (89 runs sampled)
  lib-type-of x 7,735,624 ops/sec ±1.32% (86 runs sampled)
  lib-typeof x 7,442,160 ops/sec ±1.11% (90 runs sampled)

  fastest is kind-of (by 127% avg)

# function (34 bytes)
  kind-of x 10,031,494 ops/sec ±1.27% (86 runs sampled)
  lib-type-of x 9,502,757 ops/sec ±1.17% (89 runs sampled)
  lib-typeof x 8,278,985 ops/sec ±1.08% (88 runs sampled)

  fastest is kind-of (by 113% avg)

# null (24 bytes)
  kind-of x 18,159,808 ops/sec ±1.92% (86 runs sampled)
  lib-type-of x 12,927,635 ops/sec ±1.01% (88 runs sampled)
  lib-typeof x 7,958,234 ops/sec ±1.21% (89 runs sampled)

  fastest is kind-of (by 174% avg)

# number (22 bytes)
  kind-of x 17,846,779 ops/sec ±0.91% (85 runs sampled)
  lib-type-of x 3,316,636 ops/sec ±1.19% (86 runs sampled)
  lib-typeof x 2,329,477 ops/sec ±2.21% (85 runs sampled)

  fastest is kind-of (by 632% avg)

# object-plain (47 bytes)
  kind-of x 7,085,155 ops/sec ±1.05% (88 runs sampled)
  lib-type-of x 8,870,930 ops/sec ±1.06% (83 runs sampled)
  lib-typeof x 8,716,024 ops/sec ±1.05% (87 runs sampled)

  fastest is lib-type-of (by 112% avg)

# regex (25 bytes)
  kind-of x 14,196,052 ops/sec ±1.65% (84 runs sampled)
  lib-type-of x 9,554,164 ops/sec ±1.25% (88 runs sampled)
  lib-typeof x 8,359,691 ops/sec ±1.07% (87 runs sampled)

  fastest is kind-of (by 158% avg)

# string (33 bytes)
  kind-of x 16,131,428 ops/sec ±1.41% (85 runs sampled)
  lib-type-of x 7,273,172 ops/sec ±1.05% (87 runs sampled)
  lib-typeof x 7,382,635 ops/sec ±1.17% (85 runs sampled)

  fastest is kind-of (by 220% avg)

# symbol (34 bytes)
  kind-of x 17,011,537 ops/sec ±1.24% (86 runs sampled)
  lib-type-of x 3,492,454 ops/sec ±1.23% (89 runs sampled)
  lib-typeof x 7,471,235 ops/sec ±2.48% (87 runs sampled)

  fastest is kind-of (by 310% avg)

# template-strings (36 bytes)
  kind-of x 15,434,250 ops/sec ±1.46% (83 runs sampled)
  lib-type-of x 7,157,907 ops/sec ±0.97% (87 runs sampled)
  lib-typeof x 7,517,986 ops/sec ±0.92% (86 runs sampled)

  fastest is kind-of (by 210% avg)

# undefined (29 bytes)
  kind-of x 19,167,115 ops/sec ±1.71% (87 runs sampled)
  lib-type-of x 15,477,740 ops/sec ±1.63% (85 runs sampled)
  lib-typeof x 19,075,495 ops/sec ±1.17% (83 runs sampled)

  fastest is lib-typeof,kind-of

var typeOf = require('typeof');
function Test() {}
console.log(typeOf(new Test()));
//=> 'test'

function foo() {
  console.log(typeOf(arguments)) //=> 'object'
}
foo();

function * foo() {}
console.log(typeOf(foo));
//=> 'object'
console.log(typeOf(new Buffer('')));
//=> 'object'
console.log(typeOf(new Map()));
//=> 'object'
console.log(typeOf(new Set()));
//=> 'object'
console.log(typeOf(new WeakMap()));
//=> 'object'
console.log(typeOf(new WeakSet()));
//=> 'object'