keys-length

keys-length

Get the length of the keys on an object. Much faster than Object.keys()

If you need the length of an object's properties, excluding prototype properties, use object-length

Install

Install with npm

npm i keys-length --save

Usage

var len = require('keys-length');

len({a: 'b', c: 'd', e: 'f'});
//=> 3

Related projects

• expand-object: Expand a string into a JavaScript object using a simple notation.
• object-length: Get the length of an object's properties, excluding prototype properties. Works with dontEnum bugs.

Comparison to Object.keys()

#1: 2 keys
  'for-in loop' x 24,570,016 ops/sec ±0.65% (93 runs sampled)
  'Object.keys()' x 3,840,164 ops/sec ±0.62% (97 runs sampled)

#2: 5 keys
  'for-in loop' x 22,487,684 ops/sec ±0.83% (91 runs sampled)
  'Object.keys()' x 3,169,150 ops/sec ±0.59% (97 runs sampled)

#3: 10 keys
  'for-in loop' x 20,201,512 ops/sec ±1.06% (94 runs sampled)
  'Object.keys()' x 2,519,700 ops/sec ±0.62% (94 runs sampled)

#4: 52 keys
  'for-in loop' x 10,519,640 ops/sec ±0.61% (97 runs sampled)
  'Object.keys()' x 791,094 ops/sec ±0.63% (94 runs sampled)

Running tests

Install dev dependencies:

npm i -d && npm test

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue

Author

Jon Schlinkert

• github/jonschlinkert
• twitter/jonschlinkert

License

Copyright (c) 2015 Jon Schlinkert Released under the MIT license.

This file was generated by verb-cli on May 12, 2015.