feat: add string/base/slice-code-points

lib/node_modules/@stdlib/string/base/slice-code-points/README.md

@@ -0,0 +1,90 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2025 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.
+
+-->
+
+# sliceCodePoints
+
+> Slice a string based on Unicode code point indices.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var sliceCodePoints = require( '@stdlib/string/base/slice-code-points' );
+```
+
+#### sliceCodePoints( str, start, end )
+
+Slices a string based on Unicode code point indices.
+
+```javascript
+var out = sliceCodePoints( 'Hello 👋 World', 0, 7 );
+// returns 'Hello 👋'
+
+out = sliceCodePoints( '👋👋👋', 1, 2 );
+// returns '👋'
+```
+
+The function accepts the following arguments:
+
+-   **str**: input string.
+-   **start**: the `ith` Unicode code point to start a slice (inclusive).
+-   **end**: the `jth` Unicode code point to end a slice (exclusive).
+
+</section>
+
+<!-- /.usage -->
+
+<section class="examples">
+
+## Examples
+
+```javascript
+var sliceCodePoints = require( '@stdlib/string/base/slice-code-points' );
+
+console.log( sliceCodePoints( 'Hello 👋 World', 0, 7 ) );
+// => 'Hello 👋'
+
+console.log( sliceCodePoints( 'last man standing', 1, 17 ) );
+// => 'ast man standing'
+
+console.log( sliceCodePoints( '六书/六書', 1, 14 ) );
+// => '书/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. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="links">
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/string/base/slice-code-points/benchmark/benchmark.js

@@ -0,0 +1,57 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 sliceCodePoints = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var values;
+	var out;
+	var i;
+
+	values = [
+		'Iñtërnâtiônàlizætiøn',
+		'presidential election',
+		'🐶🐮🐷🐰🐸',
+		'Hello 👋 World',
+		'अनुच्छेद'
+	];
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		out = sliceCodePoints( values[ i%values.length ], 1, 3 );
+		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();
+});

lib/node_modules/@stdlib/string/base/slice-code-points/docs/repl.txt

@@ -0,0 +1,29 @@
+
+{{alias}}( str, start, end )
+    Slices a string based on Unicode code point indices.
+
+    Parameters
+    ----------
+    str: string
+        Input string.
+    start: integer
+        The `ith` Unicode code point to start a slice (inclusive).
+    end: integer
+        The `jth` Unicode code point to end a slice (exclusive).
+
+    Returns
+    -------
+    out: string
+        Output string.
+
+    Examples
+    --------
+    > var out = {{alias}}( 'Hello 👋 World', 1, 3 )
+    'el'
+    > out = {{alias}}( '👋👋👋', 1, 2 )
+    '👋'
+    > out = {{alias}}( '六书/六書', 1, 14 )
+    '书/六書'
+
+    See Also
+    --------

lib/node_modules/@stdlib/string/base/slice-code-points/docs/types/index.d.ts

@@ -0,0 +1,42 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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
+
+/**
+* Slices a string based on Unicode code point indices.
+*
+* @param str - input string
+* @param start - the `ith` Unicode code point to start a slice (inclusive)
+* @param end - the `jth` Unicode code point to end a slice (exclusive)
+* @returns output string
+*
+* @example
+* var out = sliceCodePoints( 'Hello 👋 World', 1, 3 );
+* // returns 'el'
+*
+* @example
+* var out = sliceCodePoints( '👋👋👋', 1, 2 );
+* // returns '👋'
+*/
+declare function sliceCodePoints( str: string, start: number, end: number ): string;
+
+
+// EXPORTS //
+
+export = sliceCodePoints;

lib/node_modules/@stdlib/string/base/slice-code-points/docs/types/test.ts

@@ -0,0 +1,68 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 sliceCodePoints = require( './index' );
+
+
+// TESTS //
+
+// The function returns a string...
+{
+	sliceCodePoints( 'abc', 1, 2 ); // $ExpectType string
+}
+
+// The compiler throws an error if the function is provided a value other than a string...
+{
+	sliceCodePoints( true, 1, 2 ); // $ExpectError
+	sliceCodePoints( false, 1, 2 ); // $ExpectError
+	sliceCodePoints( null, 1, 2 ); // $ExpectError
+	sliceCodePoints( undefined, 1, 2 ); // $ExpectError
+	sliceCodePoints( 5, 1, 2 ); // $ExpectError
+	sliceCodePoints( [], 1, 2 ); // $ExpectError
+	sliceCodePoints( {}, 1, 2 ); // $ExpectError
+	sliceCodePoints( ( x: number ): number => x, 1, 2 ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a second argument that is not a number...
+{
+	sliceCodePoints( 'abc', true, 2 ); // $ExpectError
+	sliceCodePoints( 'abc', false, 2 ); // $ExpectError
+	sliceCodePoints( 'abc', null, 2 ); // $ExpectError
+	sliceCodePoints( 'abc', 'abc', 2 ); // $ExpectError
+	sliceCodePoints( 'abc', [], 2 ); // $ExpectError
+	sliceCodePoints( 'abc', {}, 2 ); // $ExpectError
+	sliceCodePoints( 'abc', ( x: number ): number => x, 2 ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a third argument that is not a number...
+{
+	sliceCodePoints( 'abc', 1, true ); // $ExpectError
+	sliceCodePoints( 'abc', 1, false ); // $ExpectError
+	sliceCodePoints( 'abc', 1, null ); // $ExpectError
+	sliceCodePoints( 'abc', 1, 'abc' ); // $ExpectError
+	sliceCodePoints( 'abc', 1, [] ); // $ExpectError
+	sliceCodePoints( 'abc', 1, {} ); // $ExpectError
+	sliceCodePoints( 'abc', 1, ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+	sliceCodePoints(); // $ExpectError
+	sliceCodePoints( 'abc' ); // $ExpectError
+	sliceCodePoints( 'abc', 1, 2, {} ); // $ExpectError
+}

lib/node_modules/@stdlib/string/base/slice-code-points/examples/index.js

@@ -0,0 +1,30 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 sliceCodePoints = require( './../lib' );
+
+console.log( sliceCodePoints( 'Hello 👋 World', 0, 7 ) );
+// => 'Hello 👋'
+
+console.log( sliceCodePoints( 'last man standing', 1, 17 ) );
+// => 'ast man standing'
+
+console.log( sliceCodePoints( '六书/六書', 1, 14 ) );
+// => '书/六書'

lib/node_modules/@stdlib/string/base/slice-code-points/lib/index.js

@@ -0,0 +1,43 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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';
+
+/**
+* Slice a string based on Unicode code point indices.
+*
+* @module @stdlib/string/base/slice-code-points
+*
+* @example
+* var sliceCodePoints = require( '@stdlib/string/base/slice-code-points' );
+*
+* var out = sliceCodePoints( 'Hello 👋 World', 1, 3 );
+* // returns 'el'
+*
+* out = sliceCodePoints( '👋👋👋', 1, 2 );
+* // returns '👋'
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;