feat: add array/base/entries2views

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Author: kgryte

lib/node_modules/@stdlib/array/base/entries2views/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.
+
+-->
+
+# entries2views
+
+> Convert array entries to an array of composite views.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var entries2views = require( '@stdlib/array/base/entries2views' );
+```
+
+#### entries2views( arr, fields )
+
+Converts array entries to an array of composite views.
+
+```javascript
+var x = [ 1, 2, 3 ];
+var fields = [ 'x', 'y' ];
+
+var out = entries2views( x, fields );
+// returns [ <Object>, <Object>, <Object> ]
+
+var v0 = out[ 0 ].toJSON();
+// returns { 'x': 0, 'y': 1 }
+
+var v1 = out[ 1 ].toJSON();
+// returns { 'x': 1, 'y': 2 }
+
+var v2 = out[ 2 ].toJSON();
+// returns { 'x': 2, 'y': 3 }
+
+// Mutate the input array:
+x[ 0 ] = 5;
+
+v0 = out[ 0 ].toJSON();
+// returns { 'x': 0, 'y': 5 }
+
+// Set a view property:
+out[ 1 ].y = 'beep';
+
+v1 = out[ 1 ].toJSON();
+// returns { 'x': 1, 'y': 'beep' }
+
+var y = x.slice();
+// returns [ 5, 'beep', 3 ]
+```
+
+The function supports the following parameters:
+
+-   **arr**: input array.
+-   **fields**: list of field names.
+
+Each element in the returned array is a class instance having prototype properties corresponding to the list of field names. As demonstrated in the example above, to convert an element to a regular object, invoke an element's `toJSON` method. Note, however, that the object returned by an element's `toJSON` method no longer shares the same memory as the provided input array.
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+-   The list of field names should be a two-element array where the first element corresponds to the field name of input array element index and the second element corresponds to the field name of the input array element value.
+-   For each element of the returned array, the index view field is read-only and cannot be mutated.
+-   Each view in the returned array shares the same memory as the corresponding element in the input array. Accordingly, mutation of either the input array or a view will mutate the other.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var entries2views = require( '@stdlib/array/base/entries2views' );
+
+var x = discreteUniform( 10, -100, 100 );
+var fields = [ 'x', 'y' ];
+
+var out = entries2views( x, fields );
+// returns [...]
+```
+
+</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 -->

lib/node_modules/@stdlib/array/base/entries2views/benchmark/benchmark.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 isArray = require( '@stdlib/assert/is-array' );
+var zeroTo = require( '@stdlib/array/base/zero-to' );
+var pkg = require( './../package.json' ).name;
+var entries2views = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg+':len=100', function benchmark( b ) {
+	var fields;
+	var x;
+	var i;
+	var v;
+
+	fields = [ 'x', 'y' ];
+	x = zeroTo( 10 );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		v = entries2views( x, fields );
+		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();
+});

lib/node_modules/@stdlib/array/base/entries2views/benchmark/benchmark.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 zeroTo = require( '@stdlib/array/base/zero-to' );
+var isArray = require( '@stdlib/assert/is-array' );
+var pkg = require( './../package.json' ).name;
+var entries2views = require( './../lib' );
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+	var fields = [ 'x', 'y' ];
+	var x = zeroTo( 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 = entries2views( x, fields );
+			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+':len='+len, f );
+	}
+}
+
+main();

lib/node_modules/@stdlib/array/base/entries2views/docs/repl.txt

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+
+{{alias}}( arr, fields )
+    Converts array entries to an array of composite views.
+
+    The list of field names should be a two-element array where the first
+    element corresponds to the field name of input array element index and the
+    second element corresponds to the field name of the input array element
+    value.
+
+    For each element of the returned array, the index view field is read-only
+    and cannot be mutated.
+
+    Parameters
+    ----------
+    arr: ArrayLikeObject
+        Input array.
+
+    fields: ArrayLikeObject
+        List of field names.
+
+    Returns
+    -------
+    out: Array<Object>
+        Output array.
+
+    Examples
+    --------
+    > var x = [ 1, 2 ];
+    > var f = [ 'x', 'y' ];
+    > var out = {{alias}}( x, f );
+    > var v = out[ 0 ].toJSON()
+    { 'x': 0, 'y': 1 }
+    > v = out[ 1 ].toJSON()
+    { 'x': 1, 'y': 2 }
+
+    See Also
+    --------
+

lib/node_modules/@stdlib/array/base/entries2views/docs/types/index.d.ts

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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.
+*/
+
+// TypeScript Version: 4.1
+
+/// <reference types="@stdlib/types"/>
+
+import { Collection, AccessorArrayLike } from '@stdlib/types/array';
+
+/**
+* Property key.
+*/
+type PropertyKey = string | number | symbol;
+
+/**
+* Converts array entries to an array of composite views.
+*
+* ## Notes
+*
+* -   The list of field names should be a two-element array where the first element corresponds to the field name of input array element index and the second element corresponds to the field name of the input array element value.
+* -   For each element of the returned array, the index view field is read-only and cannot be mutated.
+*
+* @param arr - input array
+* @param fields - list of field names
+* @returns output array
+*
+* @example
+* var x = [ 1, 2, 3 ];
+* var fields = [ 'x', 'y' ];
+*
+* var out = entries2views( x, fields );
+* // returns [ <Object>, <Object>, <Object> ]
+*
+* var v0 = out[ 0 ].toJSON();
+* // returns { 'x': 0, 'y': 1 }
+*
+* var v1 = out[ 1 ].toJSON();
+* // returns { 'x': 1, 'y': 2 }
+*
+* var v2 = out[ 2 ].toJSON();
+* // returns { 'x': 2, 'y': 3 }
+*
+* // Mutate the input array:
+* x[ 0 ] = 5;
+*
+* v0 = out[ 0 ].toJSON();
+* // returns { 'x': 0, 'y': 5 }
+*
+* // Set a view property:
+* out[ 1 ].y = 'beep';
+*
+* v1 = out[ 1 ].toJSON();
+* // returns { 'x': 1, 'y': 'beep' }
+*
+* var y = x.slice();
+* // returns [ 5, 'beep', 3 ]
+*/
+declare function entries2views<T = unknown, U extends PropertyKey = PropertyKey>( arr: Collection<T> | AccessorArrayLike<T>, fields: Collection<U> | AccessorArrayLike<U> ): Array<Record<U, T>>;
+
+
+// EXPORTS //
+
+export = entries2views;