About stdlib...
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Trim whitespace characters from the beginning of a string.
npm install @stdlib/string-left-trimAlternatively,
- To load the package in a website via a
scripttag without installation and bundlers, use the ES Module available on theesmbranch (see README). - If you are using Deno, visit the
denobranch (see README for usage intructions). - For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the
umdbranch (see README). - To use as a general utility for the command line, install the corresponding CLI package globally.
The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.
To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.
var ltrim = require( '@stdlib/string-left-trim' );Trims whitespace from the beginning of a string.
var out = ltrim( ' \r\n\t Beep \t\t\n ' );
// returns 'Beep \t\t\n '-
Following Unicode 6.3.0 and later, "whitespace" is defined as the following characters:
\f\n\r\t\v\u0020\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff
var ltrim = require( '@stdlib/string-left-trim' );
var str = ltrim( ' Whitespace ' );
// returns 'Whitespace '
str = ltrim( '\t\t\tTabs\t\t\t' );
// returns 'Tabs\t\t\t'
str = ltrim( '\n\n\nNew Lines\n\n\n' );
// returns 'New Lines\n\n\n'To use as a general utility, install the CLI package globally
npm install -g @stdlib/string-left-trim-cliUsage: ltrim [options] [<string>]
Options:
-h, --help Print this message.
-V, --version Print the package version.
--split sep Delimiter for stdin data. Default: '/\\r?\\n/'.
-
If the split separator is a regular expression, ensure that the
splitoption is either properly escaped or enclosed in quotes.# Not escaped... $ echo -n $' foo \n bar ' | ltrim --split /\r?\n/ # Escaped... $ echo -n $' foo \n bar ' | ltrim --split /\\r?\\n/
-
The implementation ignores trailing delimiters.
$ ltrim ' beep boop'
beep boopTo use as a standard stream,
$ echo -n ' beep boop' | ltrim
beep boopBy default, when used as a standard stream, the implementation assumes newline-delimited data. To specify an alternative delimiter, set the split option.
$ echo -n ' foo \t bar \t baz ' | ltrim --split '\t'
foo
bar
baz @stdlib/string-trim: trim whitespace characters from the beginning and end of a string.@stdlib/string-right-trim: trim whitespace characters from the end of a string.
This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
See LICENSE.
Copyright © 2016-2024. The Stdlib Authors.
