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without

Return a new array containing every element from an input array, except for the element at a specified index.

Installation

npm install @stdlib/array-base-without

Alternatively,

• To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
• If you are using Deno, visit the deno branch (see README for usage intructions).
• For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

var without = require( '@stdlib/array-base-without' );

without( x, index )

Returns a new array containing every element from an input array, except for the element at a specified index.

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

var out = without( x, 0 );
// returns [ 2, 3, 4 ]

out = without( x, -1 );
// returns [ 1, 2, 3 ]

The function accepts the following arguments:

• x: an input array.
• index: element index.

without.assign( x, index, out, stride, offset )

Copies every element from one array to another array, except for the element at a specified index.

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

var out = [ 0, 0, 0 ];
var arr = without.assign( x, 0, out, 1, 0 );
// returns [ 2, 3, 4 ]

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

The function accepts the following arguments:

• x: an input array.
• index: element index.
• out: output array.
• stride: output array stride.
• offset: output array offset.

Notes

• Negative indices are resolved relative to the last array element, with the last element corresponding to -1.

Examples

var discreteUniform = require( '@stdlib/random-array-discrete-uniform' );
var without = require( '@stdlib/array-base-without' );

// 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-1, opts );

// Randomly omit elements from the input array:
var i;
for ( i = 0; i < indices.length; i++ ) {
    console.log( 'x = [%s]', without( x, indices[ i ] ).join( ',' ) );
}

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Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, 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.