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feat: add truncate-middle-grapheme-cluster string package
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steff456 committed Oct 30, 2023
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<!--
@license Apache-2.0
Copyright (c) 2023 The Stdlib Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->

# truncateMiddleGraphemeCluster

> Truncate grapheme clusters of string in the middle to a specified length.
<section class="usage">

## Usage

<!-- eslint-disable id-length -->

```javascript
var truncateMiddleGraphemeCluster = require( '@stdlib/string/base/truncate-middle-grapheme-cluster' );
```

#### truncateMiddleGraphemeCluster( str, len\[, seq] )

Truncates grapheme clusters of string in the middle to a specified length.

<!-- eslint-disable id-length -->

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

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

<!-- eslint-disable id-length -->

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

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

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

<!-- eslint-disable id-length -->

```javascript
var truncateMiddleGraphemeCluster = require( '@stdlib/string/truncate-middle-grapheme-cluster' );

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

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

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

</section>

<!-- /.examples -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

</section>

<!-- /.related -->

<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="links">

</section>

<!-- /.links -->
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/**
* @license Apache-2.0
*
* Copyright (c) 2023 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

'use strict';

// MODULES //

var bench = require( '@stdlib/bench' );
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var pkg = require( './../package.json' ).name;
var truncateMiddle = require( './../lib' );


// MAIN //

bench( pkg, function benchmark( b ) {
var values;
var out;
var i;

values = [
'beep boop',
'foo bar',
'xyz abc',
'🐶🐮🐷🐰🐸'
];

b.tic();
for ( i = 0; i < b.iterations; i++ ) {
out = truncateMiddle( values[ i%values.length ], 1 );
if ( typeof out !== 'string' ) {
b.fail( 'should return a string' );
}
}
b.toc();
if ( !isString( out ) ) {
b.fail( 'should return a string' );
}
b.pass( 'benchmark finished' );
b.end();
});
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{{alias}}( str, len[, seq] )
Truncate grapheme clusters of string in the middle to a specified length.

Parameters
----------
str: string
Input string.

len: integer
Output string length.

seq: string (optional)
Custom replacement sequence. Default: '...'.

Returns
-------
out: string
Truncated string.

Examples
--------
> var str = 'beep boop';
> var out = {{alias}}( str, 5 )
'b...p'

> out = {{alias}}( str, 5, '|' )
'be|op'

See Also
--------
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/*
* @license Apache-2.0
*
* Copyright (c) 2023 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

// TypeScript Version: 4.1

/**
* Truncate grapheme clusters of string in the middle to a specified length.
*
* @param str - input string
* @param len - output string length (including sequence)
* @param seq - custom replacement sequence (default: `...`)
* @returns truncated string
*
* @example
* var str = 'beep boop';
* var out = truncateMiddle( str, 5 );
* // returns 'b...p'
*
* @example
* var str = 'beep boop';
* var out = truncateMiddle( str, 5, '>>>' );
* // returns 'b>>>p'
*
* @example
* var str = 'beep boop';
* var out = truncateMiddle( str, 10 );
* // returns 'beep boop'
*
* @example
* var str = 'beep boop';
* var out = truncateMiddle( str, 0 );
* // returns ''
*
* @example
* var str = 'beep boop';
* var out = truncateMiddle( str, 2 );
* // returns '..'
*/
declare function truncateMiddle( str: string, len: number, seq?: string ): string; // tslint-disable-line max-line-length


// EXPORTS //

export = truncateMiddle;
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/*
* @license Apache-2.0
*
* Copyright (c) 2023 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

import truncateMiddle = require( './index' );


// TESTS //

// The function returns a string...
{
truncateMiddle( 'abcdefghi', 3 ); // $ExpectType string
truncateMiddle( 'abcdefghi', 10, '|' ); // $ExpectType string
}

// The compiler throws an error if the function is not provided a string as its first argument...
{
truncateMiddle( true, 6 ); // $ExpectError
truncateMiddle( false, 6 ); // $ExpectError
truncateMiddle( 3, 6 ); // $ExpectError
truncateMiddle( [], 6 ); // $ExpectError
truncateMiddle( {}, 6 ); // $ExpectError
truncateMiddle( ( x: number ): number => x, 6 ); // $ExpectError
}

// The compiler throws an error if the function is not provided a number as its second argument...
{
truncateMiddle( 'abd', true ); // $ExpectError
truncateMiddle( 'abd', false ); // $ExpectError
truncateMiddle( 'abd', 'abc' ); // $ExpectError
truncateMiddle( 'abd', [], 0 ); // $ExpectError
truncateMiddle( 'abd', {}, 0 ); // $ExpectError
truncateMiddle( 'abd', ( x: number ): number => x, 0 ); // $ExpectError
}

// The compiler throws an error if the function is not provided a string as its third argument...
{
truncateMiddle( 'beep boop', 4, true ); // $ExpectError
truncateMiddle( 'beep boop', 4, false ); // $ExpectError
truncateMiddle( 'beep boop', 4, 123 ); // $ExpectError
truncateMiddle( 'beep boop', 4, [], 0 ); // $ExpectError
truncateMiddle( 'beep boop', 4, {}, 0 ); // $ExpectError
truncateMiddle( 'beep boop', 4, ( x: number ): number => x, 0 ); // $ExpectError
}

// The compiler throws an error if the function is provided an unsupported number of arguments...
{
truncateMiddle(); // $ExpectError
truncateMiddle( 'abc', 4, '|', true ); // $ExpectError
}
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/**
* @license Apache-2.0
*
* Copyright (c) 2023 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

'use strict';

var truncateMiddle = require( './../lib' );

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

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

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

str = 'अनुच्छेद';
out = truncateMiddle( str, 6, '...' );

Check failure on line 39 in lib/node_modules/@stdlib/string/base/truncate-middle-grapheme-cluster/examples/index.js

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GitHub Actions / Lint Changed Files

Displayed return value is `अनुच्...छेद`, but expected `अनुच्छेद` instead
console.log( out );
// => 'अनुच्...छेद'

str = '🐺 Wolf Brothers 🐺';
out = truncateMiddle( str, 7 );
console.log( out );
// => '🐺 ... 🐺'

str = '🐺 Wolf Pack 🐺';
out = truncateMiddle( str, 7, '🐺🐺🐺' );
console.log( out );
// => '🐺 🐺🐺🐺 🐺'
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