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truncateMiddle

Truncate a string in the middle to a specified length.

Installation

npm install @stdlib/string-truncate-middle

Alternatively,

• To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
• If you are using Deno, visit the deno branch (see README for usage intructions).
• For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (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.

Usage

var truncateMiddle = require( '@stdlib/string-truncate-middle' );

truncate( str, len[, seq] )

Truncates a string in the middle to a specified length.

var out = truncateMiddle( 'beep boop', 7 );
// returns 'be...op'

By default, the truncated string uses the replacement sequence '...'. To customize the replacement sequence, provide a seq argument:

var out = truncateMiddle( 'beep boop', 7, '!' );
// returns 'bee!oop'

out = truncateMiddle( 'beep boop', 7, '!!!' );
// returns 'be!!!op'

Examples

var truncateMiddle = require( '@stdlib/string-truncate-middle' );

var str = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit.';
var out = truncateMiddle( str, 15 );
// returns 'Lorem ... elit.'

str = 'To be or not to be, that is the question';
out = truncateMiddle( str, 19, '|' );
// returns 'To be or | question'

str = 'The quick fox jumps over the lazy dog.';
out = truncateMiddle( str, 28, '...' );
// returns 'The quick fox...he lazy dog.'

str = '🐺 Wolf Brothers 🐺';
out = truncateMiddle( str, 7 );
// returns '🐺 ... 🐺'

str = '🐺 Wolf Pack 🐺';
out = truncateMiddle( str, 7, '🐺🐺🐺' );
// returns '🐺 🐺🐺🐺 🐺'

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CLI

Installation

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

npm install -g @stdlib/string-truncate-middle-cli

Usage

Usage: truncate-middle [options] [<string>] --len <length>

Options:

  -h,    --help                Print this message.
  -V,    --version             Print the package version.
         --len length          String length.
         --seq str             Custom replacement sequence. Default: '...'.
         --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' | truncate-middle --len 6 --split /\r?\n/
  
  # Escaped...
  $ echo -n $'Hello, World!\nBeep Boop Baz' | truncate-middle --len 6 --split /\\r?\\n/

• The implementation ignores trailing delimiters.

Examples

$ truncate-middle 'Hello, World!' --len 8
Hel...d!

$ truncate-middle 'Hello, World!' --len 6 --seq '!'
Hel|d!

To use as a standard stream,

$ echo -n 'Hello, World!' | truncate-middle --len 8
Hel...d!

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' | truncate-middle --split '\t' --len 6 --seq '!'
Hel|d!
Bee|op

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See Also

• @stdlib/string-truncate: truncate a string to a specified length.

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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.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.