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take

Take elements from an array.

Usage

import take from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-take@deno/mod.js';

The previous example will load the latest bundled code from the deno branch. Alternatively, you may load a specific version by loading the file from one of the tagged bundles. For example,

import take from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-take@v0.3.0-deno/mod.js';

You can also import the following named exports from the package:

import { assign } from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-take@deno/mod.js';

take( x, indices, mode )

Takes elements from an array.

var x = [ 1, 2, 3, 4 ];

var y = take( x, [ 1, 3 ], 'throw' );
// returns [ 2, 4 ]

The function supports the following parameters:

• x: input array.
• indices: list of indices.
• mode: index mode.

If indices is an empty array, the function returns an empty array.

var x = [ 1, 2, 3, 4 ];

var y = take( x, [], 'throw' );
// returns []

take.assign( x, indices, mode, out, stride, offset )

Takes elements from an array and assigns the values to elements in a provided output array.

var x = [ 1, 2, 3, 4 ];

var out = [ 0, 0, 0, 0, 0, 0 ];
var indices = [ 0, 0, 1, 1, 3, 3 ];

var arr = take.assign( x, indices, 'throw', out, -1, out.length-1 );
// returns [ 4, 4, 2, 2, 1, 1 ]

var bool = ( arr === out );
// returns true

The function supports the following parameters:

• x: input array.
• indices: list of indices.
• mode: index mode.
• out: output array.
• stride: output array stride.
• offset: output array offset.

Examples

import filledBy from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-filled-by@deno/mod.js';
import discreteUniform from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-base-discrete-uniform@deno/mod.js';
import linspace from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-linspace@deno/mod.js';
import take from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-take@deno/mod.js';

// Generate a linearly spaced array:
var x = linspace( 0, 100, 11 );
console.log( x );

// Generate an array of random indices:
var N = discreteUniform( 5, 15 );
var indices = filledBy( N, discreteUniform.factory( 0, x.length-1 ) );
console.log( indices );

// Take a random sample of elements from `x`:
var y = take( x, indices, 'throw' );
console.log( y );

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Notice

This package is part of stdlib, a standard library with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.