Left pad a string with zeros or a specified string. Fastest implementation.
You might also be interested in word-wrap.
Install with npm:
$ npm install pad-left --save
var pad = require('pad-left'); pad( '4', 4, '0') // 0004 pad( '35', 4, '0') // 0035 pad('459', 4, '0') // 0459
Benchmarks for node.js v6.5.0 versus left-pad.
# benchmark/fixtures/10-custom-char.js (37 bytes) pad-left x 14,660,838 ops/sec ±1.43% (84 runs sampled) left-pad x 9,189,792 ops/sec ±1.36% (81 runs sampled) # benchmark/fixtures/10.js (32 bytes) pad-left x 13,357,570 ops/sec ±1.91% (84 runs sampled) left-pad x 20,375,277 ops/sec ±1.40% (82 runs sampled) # benchmark/fixtures/100-custom-char.js (38 bytes) pad-left x 13,671,301 ops/sec ±1.58% (83 runs sampled) left-pad x 8,917,004 ops/sec ±1.84% (79 runs sampled) # benchmark/fixtures/100.js (34 bytes) pad-left x 15,442,944 ops/sec ±1.68% (81 runs sampled) left-pad x 7,850,636 ops/sec ±1.47% (83 runs sampled) # benchmark/fixtures/1000-custom-char.js (40 bytes) pad-left x 13,624,072 ops/sec ±1.25% (84 runs sampled) left-pad x 5,907,915 ops/sec ±1.13% (86 runs sampled) # benchmark/fixtures/1000.js (35 bytes) pad-left x 14,241,788 ops/sec ±1.23% (81 runs sampled) left-pad x 5,418,351 ops/sec ±1.52% (80 runs sampled)
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Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
Generate readme and API documentation with verb:
$ npm install verb && npm run docs
Or, if verb is installed globally:
Install dev dependencies:
$ npm install -d && npm test
Jon Schlinkert
Copyright © 2016, Jon Schlinkert. Released under the MIT license.
This file was generated by verb, v0.9.0, on May 07, 2016.
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