Take elements from an indexed array.
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> Take elements from an indexed array.
``bash`
npm install @stdlib/array-base-take-indexed
`javascript`
var takeIndexed = require( '@stdlib/array-base-take-indexed' );
#### takeIndexed( x, indices )
Takes elements from an indexed array.
`javascript
var x = [ 1, 2, 3, 4 ];
var y = takeIndexed( x, [ 1, 3 ] );
// returns [ 2, 4 ]
`
If indices is an empty array, the function returns an empty array.
`javascript
var x = [ 1, 2, 3, 4 ];
var y = takeIndexed( x, [] );
// returns []
`
- The function does not perform bounds checking. If an index is less than zero or greater than the maximum index of x, the value of the corresponding element in the output array is undefined.[]
- An _indexed_ array-like object is a data structure in which one retrieves elements via integer indices using bracket notation (e.g., Float64Array, Int32Array, Array, etc). This is in contrast to an _accessor_ array-like object in which one retrieves elements using get and set methods (e.g., Complex64Array and Complex128Array).
`javascript
var filledBy = require( '@stdlib/array-base-filled-by' );
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var linspace = require( '@stdlib/array-base-linspace' );
var takeIndexed = require( '@stdlib/array-base-take-indexed' );
// Generate a linearly spaced array:
var x = linspace( 0, 100, 11 );
// Generate an array of random indices:
var N = discreteUniform( 5, 15 );
var indices = filledBy( N, discreteUniform.factory( 0, x.length-1 ) );
// Take a random sample of elements from x:
var y = takeIndexed( x, indices );
console.log( x );
console.log( indices );
console.log( y );
`
*
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For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
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---
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