@stdlib/string-starts-with-cli NPM

startsWith

Test if a string starts with the characters of another string.

Installation

To use as a general utility, install the CLI package globally

npm install -g @stdlib/string-starts-with-cli

Usage

Usage: starts-with [options] --search=<string> [<string>]

Options:

  -h,    --help                Print this message.
  -V,    --version             Print the package version.
         --search string       Search string.
         --pos int             Search position.
         --split sep           Delimiter for stdin data. Default: '/\\r?\\n/'.

Notes

If the split separator is a regular expression, ensure that the split option is either properly escaped or enclosed in quotes.

# Not escaped...
$ echo -n $'Hello, World!\nBeep Boop Baz' | starts-with --search=Beep --split /\r?\n/

# Escaped...
$ echo -n $'Hello, World!\nBeep Boop Baz' | starts-with --search=Beep --split /\\r?\\n/

The implementation ignores trailing delimiters.

Examples

$ starts-with --search=be beep
true

To use as a standard stream,

$ echo -n 'boop' | starts-with --search=bo
true

By default, when used as a standard stream, the implementation assumes newline-delimited data. To specify an alternative delimiter, set the split option.

$ echo -n 'Hello, World!\tBeep Boop' | starts-with --search=Beep --split '\t'
false
true

Notice

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.