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feat: add array/base/at2d 
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‎lib/node_modules/@stdlib/array/base/at2d/README.md

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<!--
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@license Apache-2.0
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Copyright (c) 2024 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# at2d
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> Return an element from a two-dimensional nested array.
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<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
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<section class="intro">
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</section>
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<!-- /.intro -->
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<!-- Package usage documentation. -->
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<section class="usage">
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## Usage
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```javascript
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var at2d = require( '@stdlib/array/base/at2d' );
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```
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#### at2d( x, i0, i1 )
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Return an element from a two-dimensional nested array.
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```javascript
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var x = [ [ 1, 2 ], [ 3, 4 ] ];
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var out = at2d( x, 0, 1 );
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// returns 2
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out = at2d( x, 1, 0 );
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// returns 3
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```
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</section>
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<!-- /.usage -->
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<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="notes">
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## Notes
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- Negative indices are resolved relative to the last element along the respective dimension, with the last element corresponding to `-1`.
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- If provided out-of-bounds indices, the function always returns `undefined`.
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</section>
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<!-- /.notes -->
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<!-- Package usage examples. -->
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<section class="examples">
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## Examples
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<!-- eslint no-undef: "error" -->
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```javascript
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var papply = require( '@stdlib/utils/papply' );
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var discreteUniform = require( '@stdlib/random/base/discrete-uniform' ).factory;
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var filled2dBy = require( '@stdlib/array/base/filled2d-by' );
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var binary2d = require( '@stdlib/array/base/binary2d' );
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var zeros2d = require( '@stdlib/array/base/zeros2d' );
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var at2d = require( '@stdlib/array/base/at2d' );
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var shape = [ 3, 3 ];
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// Define a nested input array:
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var x = filled2dBy( shape, discreteUniform( -100, 100 ) );
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console.log( x );
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// Define arrays containing random index values:
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var i0 = filled2dBy( shape, discreteUniform( -shape[0], shape[0]-1 ) );
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console.log( i0 );
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var i1 = filled2dBy( shape, discreteUniform( -shape[1], shape[1]-1 ) );
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console.log( i1 );
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// Define an output array:
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var out = zeros2d( shape );
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console.log( out );
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// Fill the output array with randomly selected values from the input array:
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binary2d( [ i0, i1, out ], shape, papply( at2d, x ) );
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console.log( out );
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```
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</section>
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<!-- /.examples -->
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<!-- 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. -->
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<section class="references">
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</section>
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<!-- /.references -->
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<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
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<section class="related">
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</section>
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<!-- /.related -->
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<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="links">
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</section>
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<!-- /.links -->

‎lib/node_modules/@stdlib/array/base/at2d/benchmark/benchmark.js

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2024 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var bench = require( '@stdlib/bench' );
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var uniform = require( '@stdlib/random/base/uniform' ).factory;
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var filled2dBy = require( '@stdlib/array/base/filled2d-by' );
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var isnan = require( '@stdlib/math/base/assert/is-nan' );
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var pkg = require( './../package.json' ).name;
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var at2d = require( './../lib' );
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// MAIN //
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bench( pkg, function benchmark( b ) {
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var x;
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var v;
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var i;
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var j;
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x = filled2dBy( [ 10, 10 ], uniform( 0.0, 10.0 ) );
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b.tic();
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for ( i = 0; i < b.iterations; i++ ) {
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j = ( i%20 ) - 10;
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v = at2d( x, j, j );
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if ( v !== v ) {
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b.fail( 'should not return NaN' );
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}
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}
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b.toc();
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if ( isnan( v ) ) {
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b.fail( 'should not return NaN' );
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}
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b.pass( 'benchmark finished' );
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b.end();
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});

‎lib/node_modules/@stdlib/array/base/at2d/docs/repl.txt

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{{alias}}( x, i0, i1 )
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Returns an element from a two-dimensional nested array.
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Negative indices are resolved relative to the last element along the
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respective dimension, with the last element corresponding to `-1`.
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If provided out-of-bounds indices, the function always returns `undefined`.
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Parameters
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----------
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x: ArrayLikeObject
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Input nested array.
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i0: integer
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First dimension index.
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i1: integer
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Second dimension index.
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Returns
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-------
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out: any
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Element value.
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Examples
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--------
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> var x = [ [ 1, 2 ], [ 3, 4 ] ];
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> {{alias}}( x, 0, 1 )
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2
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> {{alias}}( x, 1, 0 )
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3
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See Also
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--------
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‎lib/node_modules/@stdlib/array/base/at2d/docs/types/index.d.ts

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/*
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* @license Apache-2.0
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*
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* Copyright (c) 2024 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// TypeScript Version: 4.1
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/// <reference types="@stdlib/types"/>
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import { Array2D } from '@stdlib/types/array';
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/**
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* Returns an element from a two-dimensional nested array.
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*
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* @param x - input array
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* @param i0 - first dimension index
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* @param i1 - second dimension index
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* @returns nested array element
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*
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* @example
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* var x = [ [ 1, 2 ], [ 3, 4 ] ];
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*
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* var v = at2d( x, 0, 1 );
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* // returns 2
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*
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* v = at2d( x, 1, 0 );
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* // returns 3
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*
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* v = at2d( x, -2, -2 );
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* // returns 1
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*/
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declare function at2d<T = unknown>( x: Array2D<T>, i0: number, i1: number ): T | void;
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// EXPORTS //
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export = at2d;

‎lib/node_modules/@stdlib/array/base/at2d/docs/types/test.ts

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/*
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* @license Apache-2.0
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*
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* Copyright (c) 2024 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import at2d = require( './index' );
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// TESTS //
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// The function returns an array element...
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{
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const x = [ [ 1, 2 ], [ 3, 4 ] ];
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at2d( x, 0, 0 ); // $ExpectType number | void
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}
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// The compiler throws an error if the function is provided a first argument which is not a nested array...
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{
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at2d( 'abc', 0, 0 ); // $ExpectError
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at2d( 5, 0, 0 ); // $ExpectError
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at2d( true, 0, 0 ); // $ExpectError
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at2d( false, 0, 0 ); // $ExpectError
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at2d( null, 0, 0 ); // $ExpectError
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at2d( void 0, 0, 0 ); // $ExpectError
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at2d( {}, 0, 0 ); // $ExpectError
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at2d( ( x: number ): number => x, 0, 0 ); // $ExpectError
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}
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// The compiler throws an error if the function is provided a second argument which is not a number...
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{
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const x = [ [ 1, 2 ], [ 3, 4 ] ];
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at2d( x, 'abc', 0 ); // $ExpectError
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at2d( x, true, 0 ); // $ExpectError
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at2d( x, false, 0 ); // $ExpectError
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at2d( x, null, 0 ); // $ExpectError
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at2d( x, void 0, 0 ); // $ExpectError
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at2d( x, [ '1' ], 0 ); // $ExpectError
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at2d( x, {}, 0 ); // $ExpectError
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at2d( x, ( x: number ): number => x, 0 ); // $ExpectError
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}
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// The compiler throws an error if the function is provided a third argument which is not a number...
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{
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const x = [ [ 1, 2 ], [ 3, 4 ] ];
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at2d( x, 0, 'abc' ); // $ExpectError
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at2d( x, 0, true ); // $ExpectError
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at2d( x, 0, false ); // $ExpectError
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at2d( x, 0, null ); // $ExpectError
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at2d( x, 0, void 0 ); // $ExpectError
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at2d( x, 0, [ '1' ] ); // $ExpectError
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at2d( x, 0, {} ); // $ExpectError
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at2d( x, 0, ( x: number ): number => x ); // $ExpectError
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}
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// The compiler throws an error if the function is provided an unsupported number of arguments...
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{
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const x = [ [ 1, 2 ], [ 3, 4 ] ];
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at2d(); // $ExpectError
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at2d( x ); // $ExpectError
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at2d( x, 0 ); // $ExpectError
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at2d( x, 0, 0, 0 ); // $ExpectError
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}

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