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refactor: drop IE < 9 support
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BREAKING CHANGE: do not support environments (namely, IE8) without
`Array.isArray` and `Object.getPrototypeOf`.
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@shvaikalesh
shvaikalesh committed Oct 10, 2016
1 parent aad470b commit 69d089b
Showing 1 changed file with 128 additions and 133 deletions.
261 changes: 128 additions & 133 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,12 +4,9 @@
* Copyright(c) 2013 jake luer <[email protected]>
* MIT Licensed
*/
var getPrototypeOfExists = typeof Object.getPrototypeOf === 'function';
var promiseExists = typeof Promise === 'function';
var globalObject = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : self; // eslint-disable-line
var isDom = 'location' in globalObject && 'document' in globalObject;
var htmlElementExists = typeof HTMLElement !== 'undefined';
var isArrayExists = typeof Array.isArray === 'function';
var symbolExists = typeof Symbol !== 'undefined';
var mapExists = typeof Map !== 'undefined';
var setExists = typeof Set !== 'undefined';
Expand All @@ -20,8 +17,8 @@ var symbolIteratorExists = symbolExists && typeof Symbol.iterator !== 'undefined
var symbolToStringTagExists = symbolExists && typeof Symbol.toStringTag !== 'undefined';
var setEntriesExists = setExists && typeof Set.prototype.entries === 'function';
var mapEntriesExists = mapExists && typeof Map.prototype.entries === 'function';
var setIteratorPrototype = getPrototypeOfExists && setEntriesExists && Object.getPrototypeOf(new Set().entries());
var mapIteratorPrototype = getPrototypeOfExists && mapEntriesExists && Object.getPrototypeOf(new Map().entries());
var setIteratorPrototype = setEntriesExists && Object.getPrototypeOf(new Set().entries());
var mapIteratorPrototype = mapEntriesExists && Object.getPrototypeOf(new Map().entries());
var arrayIteratorExists = symbolIteratorExists && typeof Array.prototype[Symbol.iterator] === 'function';
var arrayIteratorPrototype = arrayIteratorExists && Object.getPrototypeOf([][Symbol.iterator]());
var stringIteratorExists = symbolIteratorExists && typeof Array.prototype[Symbol.iterator] === 'function';
Expand Down Expand Up @@ -94,7 +91,7 @@ module.exports = function typeDetect(obj) {
* Post:
* array literal x 22,479,650 ops/sec ±0.96% (81 runs sampled)
*/
if (isArrayExists && Array.isArray(obj)) {
if (Array.isArray(obj)) {
return 'Array';
}

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

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

Expand All @@ -191,7 +188,7 @@ module.exports = function typeDetect(obj) {
* - Firefox === "[object HTMLTableCellElement]"
* - Safari === "[object HTMLTableCellElement]"
*/
if (htmlElementExists && obj instanceof HTMLElement && obj.tagName === 'TH') {
if (obj instanceof HTMLElement && obj.tagName === 'TH') {
return 'HTMLTableHeaderCellElement';
}
}
Expand Down Expand Up @@ -223,142 +220,140 @@ module.exports = function typeDetect(obj) {
return stringTag;
}

if (getPrototypeOfExists) {
var objPrototype = Object.getPrototypeOf(obj);
/* ! Speed optimisation
* Pre:
* regex literal x 1,772,385 ops/sec ±1.85% (77 runs sampled)
* regex constructor x 2,143,634 ops/sec ±2.46% (78 runs sampled)
* Post:
* regex literal x 3,928,009 ops/sec ±0.65% (78 runs sampled)
* regex constructor x 3,931,108 ops/sec ±0.58% (84 runs sampled)
*/
if (objPrototype === RegExp.prototype) {
return 'RegExp';
}
var objPrototype = Object.getPrototypeOf(obj);
/* ! Speed optimisation
* Pre:
* regex literal x 1,772,385 ops/sec ±1.85% (77 runs sampled)
* regex constructor x 2,143,634 ops/sec ±2.46% (78 runs sampled)
* Post:
* regex literal x 3,928,009 ops/sec ±0.65% (78 runs sampled)
* regex constructor x 3,931,108 ops/sec ±0.58% (84 runs sampled)
*/
if (objPrototype === RegExp.prototype) {
return 'RegExp';
}

/* ! Speed optimisation
* Pre:
* date x 2,130,074 ops/sec ±4.42% (68 runs sampled)
* Post:
* date x 3,953,779 ops/sec ±1.35% (77 runs sampled)
*/
if (objPrototype === Date.prototype) {
return 'Date';
}
/* ! Speed optimisation
* Pre:
* date x 2,130,074 ops/sec ±4.42% (68 runs sampled)
* Post:
* date x 3,953,779 ops/sec ±1.35% (77 runs sampled)
*/
if (objPrototype === Date.prototype) {
return 'Date';
}

/* ! Spec Conformance
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-promise.prototype-@@tostringtag)
* ES6$25.4.5.4 - Promise.prototype[@@toStringTag] should be "Promise":
* Test: `Object.prototype.toString.call(Promise.resolve())``
* - Chrome <=47 === "[object Object]"
* - Edge <=20 === "[object Object]"
* - Firefox 29-Latest === "[object Promise]"
* - Safari 7.1-Latest === "[object Promise]"
*/
if (promiseExists && objPrototype === Promise.prototype) {
return 'Promise';
}
/* ! Spec Conformance
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-promise.prototype-@@tostringtag)
* ES6$25.4.5.4 - Promise.prototype[@@toStringTag] should be "Promise":
* Test: `Object.prototype.toString.call(Promise.resolve())``
* - Chrome <=47 === "[object Object]"
* - Edge <=20 === "[object Object]"
* - Firefox 29-Latest === "[object Promise]"
* - Safari 7.1-Latest === "[object Promise]"
*/
if (promiseExists && objPrototype === Promise.prototype) {
return 'Promise';
}

/* ! Speed optimisation
* Pre:
* set x 2,222,186 ops/sec ±1.31% (82 runs sampled)
* Post:
* set x 4,545,879 ops/sec ±1.13% (83 runs sampled)
*/
if (setExists && objPrototype === Set.prototype) {
return 'Set';
}
/* ! Speed optimisation
* Pre:
* set x 2,222,186 ops/sec ±1.31% (82 runs sampled)
* Post:
* set x 4,545,879 ops/sec ±1.13% (83 runs sampled)
*/
if (setExists && objPrototype === Set.prototype) {
return 'Set';
}

/* ! Speed optimisation
* Pre:
* map x 2,396,842 ops/sec ±1.59% (81 runs sampled)
* Post:
* map x 4,183,945 ops/sec ±6.59% (82 runs sampled)
*/
if (mapExists && objPrototype === Map.prototype) {
return 'Map';
}
/* ! Speed optimisation
* Pre:
* map x 2,396,842 ops/sec ±1.59% (81 runs sampled)
* Post:
* map x 4,183,945 ops/sec ±6.59% (82 runs sampled)
*/
if (mapExists && objPrototype === Map.prototype) {
return 'Map';
}

/* ! Speed optimisation
* Pre:
* weakset x 1,323,220 ops/sec ±2.17% (76 runs sampled)
* Post:
* weakset x 4,237,510 ops/sec ±2.01% (77 runs sampled)
*/
if (weakSetExists && objPrototype === WeakSet.prototype) {
return 'WeakSet';
}
/* ! Speed optimisation
* Pre:
* weakset x 1,323,220 ops/sec ±2.17% (76 runs sampled)
* Post:
* weakset x 4,237,510 ops/sec ±2.01% (77 runs sampled)
*/
if (weakSetExists && objPrototype === WeakSet.prototype) {
return 'WeakSet';
}

/* ! Speed optimisation
* Pre:
* weakmap x 1,500,260 ops/sec ±2.02% (78 runs sampled)
* Post:
* weakmap x 3,881,384 ops/sec ±1.45% (82 runs sampled)
*/
if (weakMapExists && objPrototype === WeakMap.prototype) {
return 'WeakMap';
}
/* ! Speed optimisation
* Pre:
* weakmap x 1,500,260 ops/sec ±2.02% (78 runs sampled)
* Post:
* weakmap x 3,881,384 ops/sec ±1.45% (82 runs sampled)
*/
if (weakMapExists && objPrototype === WeakMap.prototype) {
return 'WeakMap';
}

/* ! Spec Conformance
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-dataview.prototype-@@tostringtag)
* ES6$24.2.4.21 - DataView.prototype[@@toStringTag] should be "DataView":
* Test: `Object.prototype.toString.call(new DataView(new ArrayBuffer(1)))``
* - Edge <=13 === "[object Object]"
*/
if (dataViewExists && objPrototype === DataView.prototype) {
return 'DataView';
}
/* ! Spec Conformance
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-dataview.prototype-@@tostringtag)
* ES6$24.2.4.21 - DataView.prototype[@@toStringTag] should be "DataView":
* Test: `Object.prototype.toString.call(new DataView(new ArrayBuffer(1)))``
* - Edge <=13 === "[object Object]"
*/
if (dataViewExists && objPrototype === DataView.prototype) {
return 'DataView';
}

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

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

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

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

/* ! Speed optimisation
* Pre:
* object from null x 2,424,320 ops/sec ±1.67% (76 runs sampled)
* Post:
* object from null x 5,838,000 ops/sec ±0.99% (84 runs sampled)
*/
if (objPrototype === null) {
return 'Object';
}
/* ! Speed optimisation
* Pre:
* object from null x 2,424,320 ops/sec ±1.67% (76 runs sampled)
* Post:
* object from null x 5,838,000 ops/sec ±0.99% (84 runs sampled)
*/
if (objPrototype === null) {
return 'Object';
}

return Object
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