feat: add array/base/to-inserted-at

lib/node_modules/@stdlib/array/base/to-inserted-at/README.md

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+<!--
+
+@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.
+
+-->
+
+# toInsertedAt
+
+> Return a new array containing every element from an input array and with a provided value inserted at a specified index.
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- Package usage documentation. -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var toInsertedAt = require( '@stdlib/array/base/to-inserted-at' );
+```
+
+#### toInsertedAt( x, index, value )
+
+Returns a new array containing every element from an input array and with a provided value inserted at a specified index.
+
+```javascript
+var x = [ 1, 2, 3, 4 ];
+
+var out = toInsertedAt( x, 0, 5 );
+// returns [ 5, 1, 2, 3, 4 ]
+
+out = toInsertedAt( x, -1, 6 );
+// returns [ 1, 2, 3, 4, 6 ]
+```
+
+The function accepts the following arguments:
+
+-   **x**: an input array.
+-   **index**: element index.
+-   **value**: value to insert.
+
+### toInsertedAt.assign( x, index, value, out, stride, offset )
+
+Copies elements from one array to another array and inserts a provided value at a specified index.
+
+```javascript
+var x = [ 1, 2, 3, 4 ];
+
+var out = [ 0, 0, 0, 0, 0 ];
+var arr = toInsertedAt.assign( x, 0, 5, out, 1, 0 );
+// returns [ 5, 1, 2, 3, 4 ]
+
+var bool = ( arr === out );
+// returns true
+```
+
+The function accepts the following arguments:
+
+-   **x**: an input array.
+-   **index**: element index.
+-   **value**: value to insert.
+-   **out**: output array.
+-   **stride**: output array stride.
+-   **offset**: output array offset.
+
+</section>
+
+<!-- /.usage -->
+
+<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+## Notes
+
+-   Negative indices are resolved relative to the last array element, with the last element corresponding to `-1`.
+
+</section>
+
+<!-- /.notes -->
+
+<!-- Package usage examples. -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var toInsertedAt = require( '@stdlib/array/base/to-inserted-at' );
+
+// Define an array:
+var opts = {
+    'dtype': 'generic'
+};
+var x = discreteUniform( 5, -100, 100, opts );
+
+// Define an array containing random index values:
+var indices = discreteUniform( 100, -x.length, x.length, opts );
+
+// Define an array with random values to insert:
+var values = discreteUniform( indices.length, -10000, 10000, opts );
+
+// Randomly insert elements in the input array:
+var i;
+for ( i = 0; i < indices.length; i++ ) {
+    console.log( 'x = [%s]', toInsertedAt( x, indices[ i ], values[ i ] ).join( ',' ) );
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="references">
+
+</section>
+
+<!-- /.references -->
+
+<!-- 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 -->

lib/node_modules/@stdlib/array/base/to-inserted-at/benchmark/benchmark.assign.length.js

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+/**
+* @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 pow = require( '@stdlib/math/base/special/pow' );
+var isArray = require( '@stdlib/assert/is-array' );
+var ones = require( '@stdlib/array/base/ones' );
+var zeros = require( '@stdlib/array/base/zeros' );
+var pkg = require( './../package.json' ).name;
+var toInsertedAt = require( './../lib' );
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+	var out = zeros( len+1 );
+	var x = ones( len );
+	return benchmark;
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var v;
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			v = toInsertedAt.assign( x, i%len, i, out, 1, 0 );
+			if ( typeof v !== 'object' ) {
+				b.fail( 'should return an array' );
+			}
+		}
+		b.toc();
+		if ( !isArray( v ) ) {
+			b.fail( 'should return an array' );
+		}
+		b.pass( 'benchmark finished' );
+		b.end();
+	}
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+	var len;
+	var min;
+	var max;
+	var f;
+	var i;
+
+	min = 1; // 10^min
+	max = 6; // 10^max
+
+	for ( i = min; i <= max; i++ ) {
+		len = pow( 10, i );
+
+		f = createBenchmark( len );
+		bench( pkg+':assign:dtype=generic,len='+len, f );
+	}
+}
+
+main();

lib/node_modules/@stdlib/array/base/to-inserted-at/benchmark/benchmark.length.js

@@ -0,0 +1,96 @@
+/**
+* @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 pow = require( '@stdlib/math/base/special/pow' );
+var isArray = require( '@stdlib/assert/is-array' );
+var ones = require( '@stdlib/array/base/ones' );
+var pkg = require( './../package.json' ).name;
+var toInsertedAt = require( './../lib' );
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+	var x = ones( len );
+	return benchmark;
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var out;
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			out = toInsertedAt( x, i%len, i );
+			if ( out.length !== len+1 ) {
+				b.fail( 'unexpected length' );
+			}
+		}
+		b.toc();
+		if ( !isArray( out ) ) {
+			b.fail( 'should return an array' );
+		}
+		b.pass( 'benchmark finished' );
+		b.end();
+	}
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+	var len;
+	var min;
+	var max;
+	var f;
+	var i;
+
+	min = 1; // 10^min
+	max = 6; // 10^max
+
+	for ( i = min; i <= max; i++ ) {
+		len = pow( 10, i );
+
+		f = createBenchmark( len );
+		bench( pkg+':dtype=generic,len='+len, f );
+	}
+}
+
+main();