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CONTRIBUTORS

@@ -12,6 +12,7 @@ Anudeep Sanapala <[email protected]>
 Athan Reines <[email protected]>
 Brendan Graetz <[email protected]>
 Bruno Fenzl <[email protected]>
+Bryan Elee <[email protected]>
 Chinmay Joshi <[email protected]>
 Christopher Dambamuromo <[email protected]>
 Dan Rose <[email protected]>

base/last-grapheme-cluster/README.md

@@ -0,0 +1,95 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2024 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.
+
+-->
+
+# lastGraphemeCluster
+
+> Return the last `n` grapheme clusters (i.e., user-perceived characters) of a string.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var lastGraphemeCluster = require( '@stdlib/string/base/last-grapheme-cluster' );
+```
+
+#### lastGraphemeCluster( str, n )
+
+Returns the last `n` grapheme clusters (i.e., user-perceived characters) of a string.
+
+```javascript
+var out = lastGraphemeCluster( 'Hello World', 1 );
+// returns 'd'
+
+out = lastGraphemeCluster( 'Evening', 3 );
+// returns 'ing'
+
+out = lastGraphemeCluster( 'foo bar', 10 );
+// returns 'foo bar'
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var lastGraphemeCluster = require( '@stdlib/string/base/last-grapheme-cluster' );
+
+var str = lastGraphemeCluster( 'Hello World!', 1 );
+// returns '!'
+
+str = lastGraphemeCluster( 'JavaScript', 6 );
+// returns 'Script'
+
+str = lastGraphemeCluster( 'stdlib', 10 );
+// returns 'stdlib'
+
+str = lastGraphemeCluster( '🐶🐮🐷🐰🐸', 2 );
+// returns '🐰🐸'
+
+str = lastGraphemeCluster( '六书/六書', 2 );
+// returns '六書'
+```
+
+</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 -->

base/last-grapheme-cluster/benchmark/benchmark.js

@@ -0,0 +1,58 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 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 last = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var values;
+	var out;
+	var i;
+
+	values = [
+		'beep boop',
+		'foo bar',
+		'六書',
+		'xyz abc',
+		'🐶🐮🐷🐰🐸',
+		'🌷🌷🌷🌷🌷'
+	];
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		out = last( 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();
+});

base/last-grapheme-cluster/docs/repl.txt

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+
+{{alias}}( str, n )
+    Returns the last `n` grapheme clusters (i.e., user-perceived characters) of
+    a string.
+
+    Parameters
+    ----------
+    str: string
+        Input string.
+
+    n: integer
+        Number of grapheme clusters to return.
+
+    Returns
+    -------
+    out: string
+        Output string.
+
+    Examples
+    --------
+    > var out = {{alias}}( 'beep', 1 )
+    'p'
+    > out = {{alias}}( 'Boop', 2 )
+    'op'
+    > out = {{alias}}( 'JavaScript', 6 )
+    'Script'
+
+    See Also
+    --------
+

base/last-grapheme-cluster/docs/types/index.d.ts

@@ -0,0 +1,53 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2024 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
+
+/**
+* Returns the last `n` grapheme clusters (i.e., user-perceived characters) of a string.
+*
+* @param str - input string
+* @param n - number of grapheme clusters to return
+* @returns output string
+*
+* @example
+* var out = last( 'Hello World', 1 );
+* // returns 'd'
+*
+* @example
+* var out = last( 'Evening', 3 );
+* // returns 'ing'
+*
+* @example
+* var out = last( 'JavaScript', 6 );
+* // returns 'Script'
+*
+* @example
+* var out = last( '🐶🐮🐷🐰🐸', 2 );
+* // returns '🐰🐸'
+*
+* @example
+* var out = last( 'foo bar', 5 );
+* // returns 'o bar'
+*/
+declare function last( str: string, n: number ): string;
+
+
+// EXPORTS //
+
+export = last;

base/last-grapheme-cluster/docs/types/test.ts

@@ -0,0 +1,57 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2024 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 last = require( './index' );
+
+
+// TESTS //
+
+// The function returns a string...
+{
+	last( 'abc', 1 ); // $ExpectType string
+}
+
+// The compiler throws an error if the function is provided a value other than a string...
+{
+	last( true, 1 ); // $ExpectError
+	last( false, 1 ); // $ExpectError
+	last( null, 1 ); // $ExpectError
+	last( undefined, 1 ); // $ExpectError
+	last( 5, 1 ); // $ExpectError
+	last( [], 1 ); // $ExpectError
+	last( {}, 1 ); // $ExpectError
+	last( ( x: number ): number => x, 1 ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a second argument that is not a number...
+{
+	last( 'abc', true ); // $ExpectError
+	last( 'abc', false ); // $ExpectError
+	last( 'abc', null ); // $ExpectError
+	last( 'abc', 'abc' ); // $ExpectError
+	last( 'abc', [] ); // $ExpectError
+	last( 'abc', {} ); // $ExpectError
+	last( 'abc', ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+	last(); // $ExpectError
+	last( 'abc' ); // $ExpectError
+	last( 'abc', 1, 2 ); // $ExpectError
+}

base/last-grapheme-cluster/examples/index.js

@@ -0,0 +1,36 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 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 lastGraphemeCluster = require( './../lib' );
+
+console.log( lastGraphemeCluster( 'Hello World!', 1 ) );
+// => '!'
+
+console.log( lastGraphemeCluster( 'JavaScript', 6 ) );
+// => 'Script'
+
+console.log( lastGraphemeCluster( 'stdlib', 10 ) );
+// => 'stdlib'
+
+console.log( lastGraphemeCluster( '🐶🐮🐷🐰🐸', 2 ) );
+// => '🐰🐸'
+
+console.log( lastGraphemeCluster( '六书/六書', 2 ) );
+// => '六書'

base/last-grapheme-cluster/lib/index.js

@@ -0,0 +1,46 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 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';
+
+/**
+* Return the last `n` grapheme clusters (i.e., user-perceived characters) of a string.
+*
+* @module @stdlib/string/base/last-grapheme-cluster
+*
+* @example
+* var last = require( '@stdlib/string/base/last-grapheme-cluster' );
+*
+* var out = last( 'Hello', 1 );
+* // returns 'o';
+*
+* out = last( 'JavaScript', 1 );
+* // returns 'Script';
+*
+* out = last( '🐮🐷🐸🐵', 2 );
+* // returns '🐸🐵';
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;