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shvaikaleshshvaikalesh
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refactor: drop IE < 9 support
BREAKING CHANGE: do not support environments (namely, IE8) without `Array.isArray` and `Object.getPrototypeOf`.
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‎index.js

Lines changed: 128 additions & 133 deletions
Original file line numberDiff line numberDiff line change
@@ -4,12 +4,9 @@
44
* Copyright(c) 2013 jake luer <[email protected]>
55
* MIT Licensed
66
*/
7-
var getPrototypeOfExists = typeof Object.getPrototypeOf === 'function';
87
var promiseExists = typeof Promise === 'function';
98
var globalObject = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : self; // eslint-disable-line
109
var isDom = 'location' in globalObject && 'document' in globalObject;
11-
var htmlElementExists = typeof HTMLElement !== 'undefined';
12-
var isArrayExists = typeof Array.isArray === 'function';
1310
var symbolExists = typeof Symbol !== 'undefined';
1411
var mapExists = typeof Map !== 'undefined';
1512
var setExists = typeof Set !== 'undefined';
@@ -20,8 +17,8 @@ var symbolIteratorExists = symbolExists && typeof Symbol.iterator !== 'undefined
2017
var symbolToStringTagExists = symbolExists && typeof Symbol.toStringTag !== 'undefined';
2118
var setEntriesExists = setExists && typeof Set.prototype.entries === 'function';
2219
var mapEntriesExists = mapExists && typeof Map.prototype.entries === 'function';
23-
var setIteratorPrototype = getPrototypeOfExists && setEntriesExists && Object.getPrototypeOf(new Set().entries());
24-
var mapIteratorPrototype = getPrototypeOfExists && mapEntriesExists && Object.getPrototypeOf(new Map().entries());
20+
var setIteratorPrototype = setEntriesExists && Object.getPrototypeOf(new Set().entries());
21+
var mapIteratorPrototype = mapEntriesExists && Object.getPrototypeOf(new Map().entries());
2522
var arrayIteratorExists = symbolIteratorExists && typeof Array.prototype[Symbol.iterator] === 'function';
2623
var arrayIteratorPrototype = arrayIteratorExists && Object.getPrototypeOf([][Symbol.iterator]());
2724
var stringIteratorExists = symbolIteratorExists && typeof Array.prototype[Symbol.iterator] === 'function';
@@ -94,7 +91,7 @@ module.exports = function typeDetect(obj) {
9491
* Post:
9592
* array literal x 22,479,650 ops/sec ±0.96% (81 runs sampled)
9693
*/
97-
if (isArrayExists && Array.isArray(obj)) {
94+
if (Array.isArray(obj)) {
9895
return 'Array';
9996
}
10097

@@ -159,7 +156,7 @@ module.exports = function typeDetect(obj) {
159156
* Test: `Object.prototype.toString.call(document.createElement('blockquote'))``
160157
* - IE <=10 === "[object HTMLBlockElement]"
161158
*/
162-
if (htmlElementExists && obj instanceof HTMLElement && obj.tagName === 'BLOCKQUOTE') {
159+
if (obj instanceof HTMLElement && obj.tagName === 'BLOCKQUOTE') {
163160
return 'HTMLQuoteElement';
164161
}
165162

@@ -175,7 +172,7 @@ module.exports = function typeDetect(obj) {
175172
* - Firefox === "[object HTMLTableCellElement]"
176173
* - Safari === "[object HTMLTableCellElement]"
177174
*/
178-
if (htmlElementExists && obj instanceof HTMLElement && obj.tagName === 'TD') {
175+
if (obj instanceof HTMLElement && obj.tagName === 'TD') {
179176
return 'HTMLTableDataCellElement';
180177
}
181178

@@ -191,7 +188,7 @@ module.exports = function typeDetect(obj) {
191188
* - Firefox === "[object HTMLTableCellElement]"
192189
* - Safari === "[object HTMLTableCellElement]"
193190
*/
194-
if (htmlElementExists && obj instanceof HTMLElement && obj.tagName === 'TH') {
191+
if (obj instanceof HTMLElement && obj.tagName === 'TH') {
195192
return 'HTMLTableHeaderCellElement';
196193
}
197194
}
@@ -223,142 +220,140 @@ module.exports = function typeDetect(obj) {
223220
return stringTag;
224221
}
225222

226-
if (getPrototypeOfExists) {
227-
var objPrototype = Object.getPrototypeOf(obj);
228-
/* ! Speed optimisation
229-
* Pre:
230-
* regex literal x 1,772,385 ops/sec ±1.85% (77 runs sampled)
231-
* regex constructor x 2,143,634 ops/sec ±2.46% (78 runs sampled)
232-
* Post:
233-
* regex literal x 3,928,009 ops/sec ±0.65% (78 runs sampled)
234-
* regex constructor x 3,931,108 ops/sec ±0.58% (84 runs sampled)
235-
*/
236-
if (objPrototype === RegExp.prototype) {
237-
return 'RegExp';
238-
}
223+
var objPrototype = Object.getPrototypeOf(obj);
224+
/* ! Speed optimisation
225+
* Pre:
226+
* regex literal x 1,772,385 ops/sec ±1.85% (77 runs sampled)
227+
* regex constructor x 2,143,634 ops/sec ±2.46% (78 runs sampled)
228+
* Post:
229+
* regex literal x 3,928,009 ops/sec ±0.65% (78 runs sampled)
230+
* regex constructor x 3,931,108 ops/sec ±0.58% (84 runs sampled)
231+
*/
232+
if (objPrototype === RegExp.prototype) {
233+
return 'RegExp';
234+
}
239235

240-
/* ! Speed optimisation
241-
* Pre:
242-
* date x 2,130,074 ops/sec ±4.42% (68 runs sampled)
243-
* Post:
244-
* date x 3,953,779 ops/sec ±1.35% (77 runs sampled)
245-
*/
246-
if (objPrototype === Date.prototype) {
247-
return 'Date';
248-
}
236+
/* ! Speed optimisation
237+
* Pre:
238+
* date x 2,130,074 ops/sec ±4.42% (68 runs sampled)
239+
* Post:
240+
* date x 3,953,779 ops/sec ±1.35% (77 runs sampled)
241+
*/
242+
if (objPrototype === Date.prototype) {
243+
return 'Date';
244+
}
249245

250-
/* ! Spec Conformance
251-
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-promise.prototype-@@tostringtag)
252-
* ES6$25.4.5.4 - Promise.prototype[@@toStringTag] should be "Promise":
253-
* Test: `Object.prototype.toString.call(Promise.resolve())``
254-
* - Chrome <=47 === "[object Object]"
255-
* - Edge <=20 === "[object Object]"
256-
* - Firefox 29-Latest === "[object Promise]"
257-
* - Safari 7.1-Latest === "[object Promise]"
258-
*/
259-
if (promiseExists && objPrototype === Promise.prototype) {
260-
return 'Promise';
261-
}
246+
/* ! Spec Conformance
247+
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-promise.prototype-@@tostringtag)
248+
* ES6$25.4.5.4 - Promise.prototype[@@toStringTag] should be "Promise":
249+
* Test: `Object.prototype.toString.call(Promise.resolve())``
250+
* - Chrome <=47 === "[object Object]"
251+
* - Edge <=20 === "[object Object]"
252+
* - Firefox 29-Latest === "[object Promise]"
253+
* - Safari 7.1-Latest === "[object Promise]"
254+
*/
255+
if (promiseExists && objPrototype === Promise.prototype) {
256+
return 'Promise';
257+
}
262258

263-
/* ! Speed optimisation
264-
* Pre:
265-
* set x 2,222,186 ops/sec ±1.31% (82 runs sampled)
266-
* Post:
267-
* set x 4,545,879 ops/sec ±1.13% (83 runs sampled)
268-
*/
269-
if (setExists && objPrototype === Set.prototype) {
270-
return 'Set';
271-
}
259+
/* ! Speed optimisation
260+
* Pre:
261+
* set x 2,222,186 ops/sec ±1.31% (82 runs sampled)
262+
* Post:
263+
* set x 4,545,879 ops/sec ±1.13% (83 runs sampled)
264+
*/
265+
if (setExists && objPrototype === Set.prototype) {
266+
return 'Set';
267+
}
272268

273-
/* ! Speed optimisation
274-
* Pre:
275-
* map x 2,396,842 ops/sec ±1.59% (81 runs sampled)
276-
* Post:
277-
* map x 4,183,945 ops/sec ±6.59% (82 runs sampled)
278-
*/
279-
if (mapExists && objPrototype === Map.prototype) {
280-
return 'Map';
281-
}
269+
/* ! Speed optimisation
270+
* Pre:
271+
* map x 2,396,842 ops/sec ±1.59% (81 runs sampled)
272+
* Post:
273+
* map x 4,183,945 ops/sec ±6.59% (82 runs sampled)
274+
*/
275+
if (mapExists && objPrototype === Map.prototype) {
276+
return 'Map';
277+
}
282278

283-
/* ! Speed optimisation
284-
* Pre:
285-
* weakset x 1,323,220 ops/sec ±2.17% (76 runs sampled)
286-
* Post:
287-
* weakset x 4,237,510 ops/sec ±2.01% (77 runs sampled)
288-
*/
289-
if (weakSetExists && objPrototype === WeakSet.prototype) {
290-
return 'WeakSet';
291-
}
279+
/* ! Speed optimisation
280+
* Pre:
281+
* weakset x 1,323,220 ops/sec ±2.17% (76 runs sampled)
282+
* Post:
283+
* weakset x 4,237,510 ops/sec ±2.01% (77 runs sampled)
284+
*/
285+
if (weakSetExists && objPrototype === WeakSet.prototype) {
286+
return 'WeakSet';
287+
}
292288

293-
/* ! Speed optimisation
294-
* Pre:
295-
* weakmap x 1,500,260 ops/sec ±2.02% (78 runs sampled)
296-
* Post:
297-
* weakmap x 3,881,384 ops/sec ±1.45% (82 runs sampled)
298-
*/
299-
if (weakMapExists && objPrototype === WeakMap.prototype) {
300-
return 'WeakMap';
301-
}
289+
/* ! Speed optimisation
290+
* Pre:
291+
* weakmap x 1,500,260 ops/sec ±2.02% (78 runs sampled)
292+
* Post:
293+
* weakmap x 3,881,384 ops/sec ±1.45% (82 runs sampled)
294+
*/
295+
if (weakMapExists && objPrototype === WeakMap.prototype) {
296+
return 'WeakMap';
297+
}
302298

303-
/* ! Spec Conformance
304-
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-dataview.prototype-@@tostringtag)
305-
* ES6$24.2.4.21 - DataView.prototype[@@toStringTag] should be "DataView":
306-
* Test: `Object.prototype.toString.call(new DataView(new ArrayBuffer(1)))``
307-
* - Edge <=13 === "[object Object]"
308-
*/
309-
if (dataViewExists && objPrototype === DataView.prototype) {
310-
return 'DataView';
311-
}
299+
/* ! Spec Conformance
300+
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-dataview.prototype-@@tostringtag)
301+
* ES6$24.2.4.21 - DataView.prototype[@@toStringTag] should be "DataView":
302+
* Test: `Object.prototype.toString.call(new DataView(new ArrayBuffer(1)))``
303+
* - Edge <=13 === "[object Object]"
304+
*/
305+
if (dataViewExists && objPrototype === DataView.prototype) {
306+
return 'DataView';
307+
}
312308

313-
/* ! Spec Conformance
314-
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%mapiteratorprototype%-@@tostringtag)
315-
* ES6$23.1.5.2.2 - %MapIteratorPrototype%[@@toStringTag] should be "Map Iterator":
316-
* Test: `Object.prototype.toString.call(new Map().entries())``
317-
* - Edge <=13 === "[object Object]"
318-
*/
319-
if (mapExists && objPrototype === mapIteratorPrototype) {
320-
return 'Map Iterator';
321-
}
309+
/* ! Spec Conformance
310+
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%mapiteratorprototype%-@@tostringtag)
311+
* ES6$23.1.5.2.2 - %MapIteratorPrototype%[@@toStringTag] should be "Map Iterator":
312+
* Test: `Object.prototype.toString.call(new Map().entries())``
313+
* - Edge <=13 === "[object Object]"
314+
*/
315+
if (mapExists && objPrototype === mapIteratorPrototype) {
316+
return 'Map Iterator';
317+
}
322318

323-
/* ! Spec Conformance
324-
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%setiteratorprototype%-@@tostringtag)
325-
* ES6$23.2.5.2.2 - %SetIteratorPrototype%[@@toStringTag] should be "Set Iterator":
326-
* Test: `Object.prototype.toString.call(new Set().entries())``
327-
* - Edge <=13 === "[object Object]"
328-
*/
329-
if (setExists && objPrototype === setIteratorPrototype) {
330-
return 'Set Iterator';
331-
}
319+
/* ! Spec Conformance
320+
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%setiteratorprototype%-@@tostringtag)
321+
* ES6$23.2.5.2.2 - %SetIteratorPrototype%[@@toStringTag] should be "Set Iterator":
322+
* Test: `Object.prototype.toString.call(new Set().entries())``
323+
* - Edge <=13 === "[object Object]"
324+
*/
325+
if (setExists && objPrototype === setIteratorPrototype) {
326+
return 'Set Iterator';
327+
}
332328

333-
/* ! Spec Conformance
334-
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%arrayiteratorprototype%-@@tostringtag)
335-
* ES6$22.1.5.2.2 - %ArrayIteratorPrototype%[@@toStringTag] should be "Array Iterator":
336-
* Test: `Object.prototype.toString.call([][Symbol.iterator]())``
337-
* - Edge <=13 === "[object Object]"
338-
*/
339-
if (arrayIteratorExists && objPrototype === arrayIteratorPrototype) {
340-
return 'Array Iterator';
341-
}
329+
/* ! Spec Conformance
330+
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%arrayiteratorprototype%-@@tostringtag)
331+
* ES6$22.1.5.2.2 - %ArrayIteratorPrototype%[@@toStringTag] should be "Array Iterator":
332+
* Test: `Object.prototype.toString.call([][Symbol.iterator]())``
333+
* - Edge <=13 === "[object Object]"
334+
*/
335+
if (arrayIteratorExists && objPrototype === arrayIteratorPrototype) {
336+
return 'Array Iterator';
337+
}
342338

343-
/* ! Spec Conformance
344-
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%stringiteratorprototype%-@@tostringtag)
345-
* ES6$21.1.5.2.2 - %StringIteratorPrototype%[@@toStringTag] should be "String Iterator":
346-
* Test: `Object.prototype.toString.call(''[Symbol.iterator]())``
347-
* - Edge <=13 === "[object Object]"
348-
*/
349-
if (stringIteratorExists && objPrototype === stringIteratorPrototype) {
350-
return 'String Iterator';
351-
}
339+
/* ! Spec Conformance
340+
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%stringiteratorprototype%-@@tostringtag)
341+
* ES6$21.1.5.2.2 - %StringIteratorPrototype%[@@toStringTag] should be "String Iterator":
342+
* Test: `Object.prototype.toString.call(''[Symbol.iterator]())``
343+
* - Edge <=13 === "[object Object]"
344+
*/
345+
if (stringIteratorExists && objPrototype === stringIteratorPrototype) {
346+
return 'String Iterator';
347+
}
352348

353-
/* ! Speed optimisation
354-
* Pre:
355-
* object from null x 2,424,320 ops/sec ±1.67% (76 runs sampled)
356-
* Post:
357-
* object from null x 5,838,000 ops/sec ±0.99% (84 runs sampled)
358-
*/
359-
if (objPrototype === null) {
360-
return 'Object';
361-
}
349+
/* ! Speed optimisation
350+
* Pre:
351+
* object from null x 2,424,320 ops/sec ±1.67% (76 runs sampled)
352+
* Post:
353+
* object from null x 5,838,000 ops/sec ±0.99% (84 runs sampled)
354+
*/
355+
if (objPrototype === null) {
356+
return 'Object';
362357
}
363358

364359
return Object

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