About stdlib...
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Test if a value is a blank string.
npm install @stdlib/assert-is-blank-stringAlternatively,
- 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 isBlankString = require( '@stdlib/assert-is-blank-string' );Tests if a value is a blank string (i.e., an empty string or a string consisting only of whitespace characters).
var bool = isBlankString( ' ' );
// returns true
bool = isBlankString( '' );
// returns true
bool = isBlankString( 0 );
// returns falsevar isBlankString = require( '@stdlib/assert-is-blank-string' );
var out = isBlankString( ' ' );
// returns true
out = isBlankString( '\t\t\t' );
// returns true
out = isBlankString( '\r\n' );
// returns true
out = isBlankString( '' );
// returns true
out = isBlankString( 'beep boop' );
// returns false
out = isBlankString( null );
// returns falseTo use as a general utility, install the CLI package globally
npm install -g @stdlib/assert-is-blank-string-cliUsage: is-blank-string [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 $'\nisMobile' | is-blank-string --split /\r?\n/ # Escaped... $ echo -n $'\nisMobile' | is-blank-string --split /\\r?\\n/
-
The implementation ignores trailing delimiters.
$ is-blank-string baz
falseTo use as a standard stream,
$ echo -n ' \t ' | is-blank-string
trueBy default, when used as a standard stream, the implementation assumes newline-delimited data. To specify an alternative delimiter, set the split option.
$ echo -n '\t123' | is-blank-string --split '\t'
true
false@stdlib/assert-is-string: test if a value is a string.@stdlib/assert-is-empty-string: test if a value is an empty 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.
