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kind-of

Get the native type of a value.

Install

Install with npm:

Install

Install with

Usage

es5, browser and es6 ready

Benchmarks

Benchmarked against and . Note that performaces is slower for es6 features Map, WeakMap, Set and WeakSet.

Optimizations

In 7 out of 8 cases, this library is 2x-10x faster than other top libraries included in the benchmarks. There are a few things that lead to this performance advantage, none of them hard and fast rules, but all of them simple and repeatable in almost any code library:

Optimize around the fastest and most common use cases first. Of course, this will change from project-to-project, but I took some time to understand how and why typeof checks were being used in my own libraries and other libraries I use a lot.
Optimize around bottlenecks - In other words, the order in which conditionals are implemented is significant, because each check is only as fast as the failing checks that came before it. Here, the biggest bottleneck by far is checking for plain objects (an object that was created by the Object constructor). I opted to make this check happen by process of elimination rather than brute force up front (e.g. by using something like val.constructor.name), so that every other type check would not be penalized it.

About

: Returns true if the given string looks like a glob pattern or an extglob pattern… |
: Returns true if the value is a number. comprehensive tests. |

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, .

Contributors

Building docs

(This project's readme.md is generated by , please don't edit the readme directly. Any changes to the readme must be made in the readme template.)

To generate the readme, run the following command:

Running tests

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:

Author

Jon Schlinkert

License

This file was generated by , v0.6.0, on May 16, 2017.

kind-of

Get the native type of a value.

Install

Install with npm:

$ npm install --save kind-of

Install

Install with

Usage

es5, browser and es6 ready

Benchmarks

Benchmarked against and . Note that performaces is slower for es6 features Map, WeakMap, Set and WeakSet.

Optimizations

Optimize around the fastest and most common use cases first. Of course, this will change from project-to-project, but I took some time to understand how and why typeof checks were being used in my own libraries and other libraries I use a lot.
Optimize around bottlenecks - In other words, the order in which conditionals are implemented is significant, because each check is only as fast as the failing checks that came before it. Here, the biggest bottleneck by far is checking for plain objects (an object that was created by the Object constructor). I opted to make this check happen by process of elimination rather than brute force up front (e.g. by using something like val.constructor.name), so that every other type check would not be penalized it.

About

: Returns true if the given string looks like a glob pattern or an extglob pattern… |
: Returns true if the value is a number. comprehensive tests. |

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, .

Contributors

Building docs

(This project's readme.md is generated by , please don't edit the readme directly. Any changes to the readme must be made in the readme template.)

To generate the readme, run the following command:

Running tests

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:

Author

Jon Schlinkert

License

This file was generated by , v0.6.0, on May 16, 2017.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

kindOf([]);
//=> 'array'

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

kindOf(new Array());
//=> 'array'

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

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

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

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

kindOf(new Function());
//=> 'function'

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

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

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

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

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

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'

#1: array
  current x 23,329,397 ops/sec ±0.82% (94 runs sampled)
  lib-type-of x 4,170,273 ops/sec ±0.55% (94 runs sampled)
  lib-typeof x 9,686,935 ops/sec ±0.59% (98 runs sampled)

#2: boolean
  current x 27,197,115 ops/sec ±0.85% (94 runs sampled)
  lib-type-of x 3,145,791 ops/sec ±0.73% (97 runs sampled)
  lib-typeof x 9,199,562 ops/sec ±0.44% (99 runs sampled)

#3: date
  current x 20,190,117 ops/sec ±0.86% (92 runs sampled)
  lib-type-of x 5,166,970 ops/sec ±0.74% (94 runs sampled)
  lib-typeof x 9,610,821 ops/sec ±0.50% (96 runs sampled)

#4: function
  current x 23,855,460 ops/sec ±0.60% (97 runs sampled)
  lib-type-of x 5,667,740 ops/sec ±0.54% (100 runs sampled)
  lib-typeof x 10,010,644 ops/sec ±0.44% (100 runs sampled)

#5: null
  current x 27,061,047 ops/sec ±0.97% (96 runs sampled)
  lib-type-of x 13,965,573 ops/sec ±0.62% (97 runs sampled)
  lib-typeof x 8,460,194 ops/sec ±0.61% (97 runs sampled)

#6: number
  current x 25,075,682 ops/sec ±0.53% (99 runs sampled)
  lib-type-of x 2,266,405 ops/sec ±0.41% (98 runs sampled)
  lib-typeof x 9,821,481 ops/sec ±0.45% (99 runs sampled)

#7: object
  current x 3,348,980 ops/sec ±0.49% (99 runs sampled)
  lib-type-of x 3,245,138 ops/sec ±0.60% (94 runs sampled)
  lib-typeof x 9,262,952 ops/sec ±0.59% (99 runs sampled)

#8: regex
  current x 21,284,827 ops/sec ±0.72% (96 runs sampled)
  lib-type-of x 4,689,241 ops/sec ±0.43% (100 runs sampled)
  lib-typeof x 8,957,593 ops/sec ±0.62% (98 runs sampled)

#9: string
  current x 25,379,234 ops/sec ±0.58% (96 runs sampled)
  lib-type-of x 3,635,148 ops/sec ±0.76% (93 runs sampled)
  lib-typeof x 9,494,134 ops/sec ±0.49% (98 runs sampled)

#10: undef
  current x 27,459,221 ops/sec ±1.01% (93 runs sampled)
  lib-type-of x 14,360,433 ops/sec ±0.52% (99 runs sampled)
  lib-typeof x 23,202,868 ops/sec ±0.59% (94 runs sampled)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

kindOf([]);
//=> 'array'

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

kindOf(new Array());
//=> 'array'

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

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

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

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

kindOf(new Function());
//=> 'function'

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

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

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

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

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

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'

#1: array
  current x 23,329,397 ops/sec ±0.82% (94 runs sampled)
  lib-type-of x 4,170,273 ops/sec ±0.55% (94 runs sampled)
  lib-typeof x 9,686,935 ops/sec ±0.59% (98 runs sampled)

#2: boolean
  current x 27,197,115 ops/sec ±0.85% (94 runs sampled)
  lib-type-of x 3,145,791 ops/sec ±0.73% (97 runs sampled)
  lib-typeof x 9,199,562 ops/sec ±0.44% (99 runs sampled)

#3: date
  current x 20,190,117 ops/sec ±0.86% (92 runs sampled)
  lib-type-of x 5,166,970 ops/sec ±0.74% (94 runs sampled)
  lib-typeof x 9,610,821 ops/sec ±0.50% (96 runs sampled)

#4: function
  current x 23,855,460 ops/sec ±0.60% (97 runs sampled)
  lib-type-of x 5,667,740 ops/sec ±0.54% (100 runs sampled)
  lib-typeof x 10,010,644 ops/sec ±0.44% (100 runs sampled)

#5: null
  current x 27,061,047 ops/sec ±0.97% (96 runs sampled)
  lib-type-of x 13,965,573 ops/sec ±0.62% (97 runs sampled)
  lib-typeof x 8,460,194 ops/sec ±0.61% (97 runs sampled)

#6: number
  current x 25,075,682 ops/sec ±0.53% (99 runs sampled)
  lib-type-of x 2,266,405 ops/sec ±0.41% (98 runs sampled)
  lib-typeof x 9,821,481 ops/sec ±0.45% (99 runs sampled)

#7: object
  current x 3,348,980 ops/sec ±0.49% (99 runs sampled)
  lib-type-of x 3,245,138 ops/sec ±0.60% (94 runs sampled)
  lib-typeof x 9,262,952 ops/sec ±0.59% (99 runs sampled)

#8: regex
  current x 21,284,827 ops/sec ±0.72% (96 runs sampled)
  lib-type-of x 4,689,241 ops/sec ±0.43% (100 runs sampled)
  lib-typeof x 8,957,593 ops/sec ±0.62% (98 runs sampled)

#9: string
  current x 25,379,234 ops/sec ±0.58% (96 runs sampled)
  lib-type-of x 3,635,148 ops/sec ±0.76% (93 runs sampled)
  lib-typeof x 9,494,134 ops/sec ±0.49% (98 runs sampled)

#10: undef
  current x 27,459,221 ops/sec ±1.01% (93 runs sampled)
  lib-type-of x 14,360,433 ops/sec ±0.52% (99 runs sampled)
  lib-typeof x 23,202,868 ops/sec ±0.59% (94 runs sampled)

kind-of

hashtagInstall

hashtagInstall

hashtagUsage

hashtagBenchmarks

hashtagOptimizations

hashtagAbout

hashtagRelated projects

hashtagContributing

hashtagContributors

hashtagBuilding docs

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kind-of

hashtagInstall

hashtagInstall

hashtagUsage

hashtagBenchmarks

hashtagOptimizations

hashtagAbout

hashtagRelated projects

hashtagContributing

hashtagContributors

hashtagBuilding docs

hashtagRunning tests

hashtagAuthor

hashtagLicense

Install

Install

Usage

Benchmarks

Optimizations

About

Related projects

Contributing

Contributors

Building docs

Running tests

Author

License

Install

Install

Usage

Benchmarks

Optimizations

About

Related projects

Contributing

Contributors

Building docs

Running tests

Author

License