npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@stdlib/utils-map3d

v0.2.2

Published

Apply a function to each nested element in a three-dimensional nested array and assign the result to a nested element in a new three-dimensional nested array.

Downloads

3

Readme

map3d

NPM version Build Status Coverage Status

Apply a function to each nested element in a three-dimensional nested array and assign the result to a nested element in a new three-dimensional nested array.

Installation

npm install @stdlib/utils-map3d

Usage

var map3d = require( '@stdlib/utils-map3d' );

map3d( arr, fcn[, thisArg] )

Applies a function to each nested element in a three-dimensional nested array and assigns the result to a nested element in a new three-dimensional nested array.

var naryFunction = require( '@stdlib/utils-nary-function' );
var abs = require( '@stdlib/math-base-special-abs' );

var arr = [
    [ [ -1, -2, -3 ] ],
    [ [ -4, -5, -6 ] ]
];

var out = map3d( arr, naryFunction( abs, 1 ) );
// returns [ [ [ 1, 2, 3 ] ], [ [ 4, 5, 6 ] ] ]

The applied function is provided the following arguments:

  • value: array element.
  • indices: current array element indices.
  • arr: input array.

To set the this context when invoking the input function, provide a thisArg.

var abs = require( '@stdlib/math-base-special-abs' );

function fcn( v ) {
    this.count += 1;
    return abs( v );
}

var arr = [
    [ [ -1, -2, -3 ] ],
    [ [ -4, -5, -6 ] ]
];

var ctx = {
    'count': 0
};

var out = map3d( arr, fcn, ctx );
// returns [ [ [ 1, 2, 3 ] ], [ [ 4, 5, 6 ] ] ]

var cnt = ctx.count;
// returns 6

Examples

var filledarrayBy = require( '@stdlib/array-filled-by' );
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' ).factory;
var naryFunction = require( '@stdlib/utils-nary-function' );
var abs2 = require( '@stdlib/math-base-special-abs2' );
var map3d = require( '@stdlib/utils-map3d' );

function nestedFill( i ) {
    var rand = discreteUniform( -10*(i+1), 10*(i+1) );
    return filledarrayBy( 10, 'float64', rand );
}

function fill() {
    return filledarrayBy( 10, 'generic', nestedFill );
}

// Create a three-dimensional nested array:
var x = filledarrayBy( 10, 'generic', fill );

// Create an explicit unary function:
var f = naryFunction( abs2, 1 );

// Compute the element-wise squared absolute value...
var y = map3d( x, f );

console.log( 'x:' );
console.log( x );

console.log( 'y:' );
console.log( y );

See Also

  • @stdlib/utils-map: apply a function to each element in an array and assign the result to an element in an output array.
  • @stdlib/utils-map2d: apply a function to each nested element in an array of arrays and assign the result to a nested element in a new array of arrays.
  • @stdlib/utils-map4d: apply a function to each nested element in a four-dimensional nested array and assign the result to a nested element in a new four-dimensional nested array.
  • @stdlib/utils-map5d: apply a function to each nested element in a five-dimensional nested array and assign the result to a nested element in a new five-dimensional nested array.

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

Chat


License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.