npm install utils-left-pad-stringLeft Pad
===
[![NPM version][npm-image]][npm-url] [![Build Status][build-image]][build-url] [![Coverage Status][coverage-image]][coverage-url] [![Dependencies][dependencies-image]][dependencies-url]
> Left pad a string.
`` bash`
$ npm install utils-left-pad-string
` javascript`
var lpad = require( 'utils-left-pad-string' );
#### lpad( str, len[, pad] )
Left pads a string such that the padded string has a length of __at least__ len.
` javascript`
var str = lpad( 'a', 5 );
// returns ' a'
By default, an input string is padded with spaces. To pad with a different character or sequence of characters, provide a pad string.
` javascript
var str = lpad( 'beep', 10, 'b' );
// returns 'bbbbbbbeep'
str = lpad( 'boop', 12, 'beep' );
// returns 'beepbeepboop'
`
* An output string is __not__ guaranteed to have a length of __exactly__ len, but to have a length of __at least__ len. To generate a padded string having a length equal to len
` javascript
var str = lpad( 'boop', 10, 'beep' );
// returns 'beepbeepboop' => length 12
str = str.substring( str.length-10 );
// returns 'epbeepboop' => length 10
`
` javascript
var round = require( 'math-round' );
var lpad = require( 'utils-left-pad-string' );
var str = 'beep';
var n;
var i;
for ( i = 0; i < 100; i++ ) {
n = round( Math.random()*10 ) + str.length;
console.log( lpad( str, n, 'b' ) );
}
`
To run the example code from the top-level application directory,
` bash`
$ node ./examples/index.js
---
To use the module as a general utility, install the module globally
` bash`
$ npm install -g utils-left-pad-string
` bash
Usage: lpad [options] str --len length
Options:
-h, --help Print this message.
-V, --version Print the package version.
--len length Minimum string length.
--pad str String used to pad. Default: ' '.
`
` bash`
$ lpad beep --len 10 --pad b=> bbbbbbbeep
---
This repository uses [tape][tape] for unit tests. To run the tests, execute the following command in the top-level application directory:
` bash`
$ make test
All new feature development should have corresponding unit tests to validate correct functionality.
This repository uses [Istanbul][istanbul] as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:
` bash`
$ make test-cov
Istanbul creates a ./reports/coverage directory. To access an HTML version of the report,
` bash`
$ make view-cov
This repository uses [Testling][testling] for browser testing. To run the tests in a (headless) local web browser, execute the following command in the top-level application directory:
` bash`
$ make test-browsers
To view the tests in a local web browser,
` bash``
$ make view-browser-tests
---
Copyright © 2016. Athan Reines.
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[npm-url]: https://npmjs.org/package/utils-left-pad-string
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[build-url]: https://travis-ci.org/kgryte/utils-left-pad-string
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[coverage-url]: https://codecov.io/github/kgryte/utils-left-pad-string?branch=master
[dependencies-image]: http://img.shields.io/david/kgryte/utils-left-pad-string.svg
[dependencies-url]: https://david-dm.org/kgryte/utils-left-pad-string
[dev-dependencies-image]: http://img.shields.io/david/dev/kgryte/utils-left-pad-string.svg
[dev-dependencies-url]: https://david-dm.org/dev/kgryte/utils-left-pad-string
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[github-issues-url]: https://github.com/kgryte/utils-left-pad-string/issues
[tape]: https://github.com/substack/tape
[istanbul]: https://github.com/gotwarlost/istanbul
[testling]: https://ci.testling.com