README.md

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arrayWith

Return a new array with the element at the specified index replaced with a provided value.

Usage

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

arrayWith( x, index, value )

Returns a new array with the element at the specified index replaced with a provided value.

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

var out = arrayWith( x, 0, 5 );
// returns [ 5, 2, 3, 4 ]

out = arrayWith( x, -1, 6 );
// returns [ 1, 2, 3, 6 ]

The function accepts the following arguments:

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

arrayWith.assign( x, index, value, out, stride, offset )

Copies elements from one array to another array and sets the element at the specified index to a provided value.

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

var out = [ 0, 0, 0, 0 ];
var arr = arrayWith.assign( x, 0, 5, out, 1, 0 );
// returns [ 5, 2, 3, 4 ]

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

The function accepts the following arguments:

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

Notes

• If provided an array-like object having a with method, the arrayWith function defers execution to that method and assumes that the method has the following signature:

  x.with( index, value )
  

  If provided an array-like object without a with method, the arrayWith function shallow copies input array data to a new generic array, normalizes a provided index, and sets a specified element.

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

Examples

import discreteUniform from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-array-discrete-uniform@deno/mod.js';
import arrayWith from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-with@deno/mod.js';

// 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 );

// Define an array with random values to set:
var values = discreteUniform( indices.length, -10000, 10000, opts );

// Randomly set elements in the input array:
var i;
for ( i = 0; i < indices.length; i++ ) {
    console.log( 'x = [%s]', arrayWith( x, indices[ i ], values[ i ] ).join( ',' ) );
}

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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.