@stdlib/array-to-fancy

Convert an array to an object supporting fancy indexing.

https://github.com/stdlib-js/array-to-fancy

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array data fancy index indexing javascript node node-js nodejs slice stdlib structure subseq subsequence types vector

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Convert an array to an object supporting fancy indexing.

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Host: GitHub
Owner: stdlib-js
License: apache-2.0
Language: JavaScript
Default Branch: main
Homepage: https://github.com/stdlib-js/stdlib
Size: 4.32 MB

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array data fancy index indexing javascript node node-js nodejs slice stdlib structure subseq subsequence types vector

Created almost 2 years ago · Last pushed 11 months ago

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We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

array2fancy

Convert an array to an object supporting fancy indexing.

An array supporting **fancy indexing** is an array which supports slicing via indexing expressions for both retrieval and assignment. ```javascript var array2fancy = require( '@stdlib/array-to-fancy' ); // Create a plain array: var x = [ 1, 2, 3, 4, 5, 6, 7, 8 ]; // Turn the plain array into a "fancy" array: var y = array2fancy( x ); // Select the first three elements: var v = y[ ':3' ]; // returns [ 1, 2, 3 ] // Select every other element, starting from the second element: v = y[ '1::2' ]; // returns [ 2, 4, 6, 8 ] // Select every other element, in reverse order, starting with the last element: v = y[ '::-2' ]; // returns [ 8, 6, 4, 2 ] // Set all elements to the same value: y[ ':' ] = 9; // Create a shallow copy by selecting all elements: v = y[ ':' ]; // returns [ 9, 9, 9, 9, 9, 9, 9, 9 ] ```

## Installation ```bash npm install @stdlib/array-to-fancy ``` Alternatively, - To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]). - If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions). - For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]). The [branches.md][branches-url] 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 ```javascript var array2fancy = require( '@stdlib/array-to-fancy' ); ``` #### array2fancy( x\[, options] ) Converts an array to an object supporting fancy indexing. ```javascript var Slice = require( '@stdlib/slice-ctor' ); var x = [ 1, 2, 3, 4 ]; var y = array2fancy( x ); // returns // Normal element access: var v = y[ 0 ]; // returns 1 v = y[ 1 ]; // returns 2 // Using negative integers: v = y[ -1 ]; // returns 4 v = y[ -2 ]; // returns 3 // Using subsequence expressions: v = y[ '1::2' ]; // returns [ 2, 4 ] // Using Slice objects: v = y[ new Slice( 1, null, 2 ) ]; // returns [ 2, 4 ] // Assignment: y[ '1:3' ] = 5; v = y[ ':' ]; // returns [ 1, 5, 5, 4 ] ``` The function supports the following options: - **cache**: cache for resolving array index objects. Must have a `get` method which accepts a single argument: a string identifier associated with an array index. If an array index associated with a provided identifier exists, the `get` method should return an object having the following properties: - **data**: the underlying index array. - **type**: the index type. Must be either `'mask'`, `'bool'`, or `'int'`. - **dtype**: the [data type][@stdlib/array/dtypes] of the underlying array. If an array index is not associated with a provided identifier, the `get` method should return `null`. Default: [`ArrayIndex`][@stdlib/array/index]. - **strict**: boolean indicating whether to enforce strict bounds checking. Default: `false`. By default, the function returns a fancy array which does **not** enforce strict bounds checking. For example, ```javascript var y = array2fancy( [ 1, 2, 3, 4 ] ); var v = y[ 10 ]; // returns undefined ``` To enforce strict bounds checking, set the `strict` option to `true`. ```javascript var y = array2fancy( [ 1, 2, 3, 4 ], { 'strict': true }); var v = y[ 10 ]; // throws ``` #### array2fancy.factory( \[options] ) Returns a function for converting an array to an object supporting fancy indexing. ```javascript var fcn = array2fancy.factory(); var x = [ 1, 2, 3, 4 ]; var y = fcn( x ); // returns var v = y[ ':' ]; // returns [ 1, 2, 3, 4 ] ``` The function supports the following options: - **cache**: default cache for resolving array index objects. Must have a `get` method which accepts a single argument: a string identifier associated with an array index. If an array index associated with a provided identifier exists, the `get` method should return an object having the following properties: - **data**: the underlying index array. - **type**: the index type. Must be either `'mask'`, `'bool'`, or `'int'`. - **dtype**: the [data type][@stdlib/array/dtypes] of the underlying array. If an array index is not associated with a provided identifier, the `get` method should return `null`. Default: [`ArrayIndex`][@stdlib/array/index]. - **strict**: boolean indicating whether to enforce strict bounds checking by default. Default: `false`. By default, the function returns a function which, by default, does **not** enforce strict bounds checking. For example, ```javascript var fcn = array2fancy.factory(); var y = fcn( [ 1, 2, 3, 4 ] ); var v = y[ 10 ]; // returns undefined ``` To enforce strict bounds checking by default, set the `strict` option to `true`. ```javascript var fcn = array2fancy.factory({ 'strict': true }); var y = fcn( [ 1, 2, 3, 4 ] ); var v = y[ 10 ]; // throws ``` The returned function supports the same options as above. When the returned function is provided option values, those values override the factory method defaults. #### array2fancy.idx( x\[, options] ) Wraps a provided array as an array index object. ```javascript var x = [ 1, 2, 3, 4 ]; var idx = array2fancy.idx( x ); // returns ``` For documentation and usage, see [`ArrayIndex`][@stdlib/array/index].

## Notes - A fancy array shares the **same** data as the provided input array. Hence, any mutations to the returned array will affect the underlying input array and vice versa. - For operations returning a new array (e.g., when slicing or invoking an instance method), a fancy array returns a new fancy array having the same configuration as specified by `options`. - A fancy array supports indexing using positive and negative integers (both numeric literals and strings), [`Slice`][@stdlib/slice/ctor] instances, [subsequence expressions][@stdlib/slice/seq2slice], and [index arrays][@stdlib/array/index] (boolean, mask, and integer). - A fancy array supports all properties and methods of the input array, and, thus, a fancy array can be consumed by any API which supports array-like objects. - Indexing expressions provide a convenient and powerful means for creating and operating on array views; however, their use does entail a performance cost. Indexing expressions are best suited for interactive use (e.g., in the [REPL][@stdlib/repl]) and scripting. For performance critical applications, prefer equivalent functional APIs supporting array-like objects. - In older JavaScript environments which do **not** support [`Proxy`][@stdlib/proxy/ctor] objects, the use of indexing expressions is **not** supported. ### Bounds Checking By default, fancy arrays do **not** enforce strict bounds checking across index expressions. The motivation for the default fancy array behavior stems from a desire to maintain parity with plain arrays; namely, the returning of `undefined` when accessing a single non-existent property. Accordingly, when `strict` is `false`, one may observe the following behaviors: ```javascript var x = array2fancy( [ 1, 2, 3, 4 ], { 'strict': false }); // Access a non-existent property: var v = x[ 'foo' ]; // returns undefined // Access an out-of-bounds index: v = x[ 10 ]; // returns undefined v = x[ -10 ]; // returns undefined // Access an out-of-bounds slice: v = x[ '10:' ]; // returns [] // Access one or more out-of-bounds indices: var i = array2fancy.idx( [ 10, 20 ] ); v = x[ i ]; // throws ``` When `strict` is `true`, fancy arrays normalize index behavior and consistently enforce strict bounds checking. ```javascript var x = array2fancy( [ 1, 2, 3, 4 ], { 'strict': true }); // Access a non-existent property: var v = x[ 'foo' ]; // returns undefined // Access an out-of-bounds index: v = x[ 10 ]; // throws v = x[ -10 ]; // throws // Access an out-of-bounds slice: v = x[ '10:' ]; // throws // Access one or more out-of-bounds indices: var i = array2fancy.idx( [ 10, 20 ] ); v = x[ i ]; // throws ``` ### Broadcasting Fancy arrays support **broadcasting** in which assigned scalars and single-element arrays are repeated (without additional memory allocation) to match the length of a target array instance. ```javascript var y = array2fancy( [ 1, 2, 3, 4 ] ); // Broadcast a scalar: y[ ':' ] = 5; var v = y[ ':' ]; // returns [ 5, 5, 5, 5 ] // Broadcast a single-element array: y[ ':' ] = [ 6 ]; v = y[ ':' ]; // returns [ 6, 6, 6, 6 ] ``` Fancy array broadcasting follows the [same rules][@stdlib/ndarray/base/broadcast-shapes] as for [ndarrays][@stdlib/ndarray/ctor]. Consequently, when assigning arrays to slices, the array on the right-hand-side must be broadcast-compatible with number of elements in the slice. For example, each assignment expression in the following example follows broadcast rules and is thus valid. ```javascript var y = array2fancy( [ 1, 2, 3, 4 ] ); y[ ':' ] = [ 5, 6, 7, 8 ]; var v = y[ ':' ]; // returns [ 5, 6, 7, 8 ] y[ '1::2' ] = [ 9, 10 ]; v = y[ ':' ]; // returns [ 5, 9, 7, 10 ] y[ '1::2' ] = [ 11 ]; v = y[ ':' ]; // returns [ 5, 11, 7, 11 ] y[ '1::2' ] = 12; v = y[ ':' ]; // returns [ 5, 12, 7, 12 ] // Out-of-bounds slices (i.e., slices with zero elements): y[ '10:20' ] = [ 13 ]; v = y[ ':' ]; // returns [ 5, 12, 7, 12 ] y[ '10:20' ] = 13; v = y[ ':' ]; // returns [ 5, 12, 7, 12 ] y[ '10:20' ] = []; v = y[ ':' ]; // returns [ 5, 12, 7, 12 ] ``` However, the following assignment expressions are not valid. ```javascript var y = array2fancy( [ 1, 2, 3, 4 ] ); y[ ':' ] = [ 5, 6 ]; // throws // Out-of-bounds slice (i.e., a slice with zero elements): y[ '10:20' ] = [ 8, 9, 10, 11 ]; // throws ``` In order to broadcast a nested array element as one would a scalar, one must wrap the element in a single-element array. ```javascript var y = array2fancy( [ [ 1, 2 ], [ 3, 4 ] ] ); // Assign individual array elements: y[ ':' ] = [ 5, 6 ]; var v = y[ ':' ]; // returns [ 5, 6 ] y = array2fancy( [ [ 1, 2 ], [ 3, 4 ] ] ); // Broadcast a nested array: y[ ':' ] = [ [ 5, 6 ] ]; v = y[ ':' ]; // returns [ [ 5, 6 ], [ 5, 6 ] ] ``` ### Casting Fancy arrays support [(mostly) safe casts][@stdlib/array/mostly-safe-casts] (i.e., any cast which can be performed without overflow or loss of precision, with the exception of floating-point arrays which are also allowed to downcast from higher precision to lower precision). ```javascript var Uint8Array = require( '@stdlib/array-uint8' ); var Int32Array = require( '@stdlib/array-int32' ); var x = new Int32Array( [ 1, 2, 3, 4 ] ); var y = array2fancy( x ); // 8-bit unsigned integer values can be safely cast to 32-bit signed integer values: y[ ':' ] = new Uint8Array( [ 5, 6, 7, 8 ] ); ``` When attempting to perform an unsafe cast, fancy arrays will raise an exception. ```javascript var Uint8Array = require( '@stdlib/array-uint8' ); var x = new Uint8Array( [ 1, 2, 3, 4 ] ); var y = array2fancy( x ); // Attempt to assign a non-integer value: y[ ':' ] = 3.14; // throws // Attempt to assign a negative value: y[ ':' ] = -3; // throws ``` When assigning a real-valued scalar to a complex number array (e.g., [`Complex128Array`][@stdlib/array/complex128] or [`Complex64Array`][@stdlib/array/complex64]), a fancy array will cast the real-valued scalar to a complex number argument having an imaginary component equal to zero. ```javascript var Complex128Array = require( '@stdlib/array-complex128' ); var real = require( '@stdlib/complex-float64-real' ); var imag = require( '@stdlib/complex-float64-imag' ); var x = new Complex128Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] ); var y = array2fancy( x ); // Retrieve the first element: var v = y[ 0 ]; // returns var re = real( v ); // returns 1.0 var im = imag( v ); // returns 2.0 // Assign a real-valued scalar to the first element: y[ 0 ] = 9.0; v = y[ 0 ]; // returns re = real( v ); // returns 9.0 im = imag( v ); // returns 0.0 ```

## Examples ```javascript var Uint8Array = require( '@stdlib/array-uint8' ); var Int32Array = require( '@stdlib/array-int32' ); var BooleanArray = require( '@stdlib/array-bool' ); var array2fancy = require( '@stdlib/array-to-fancy' ); var x = [ 1, 2, 3, 4, 5, 6 ]; var y = array2fancy( x ); // returns // Slice retrieval: var z = y[ '1::2' ]; // returns [ 2, 4, 6 ] z = y[ '-2::-2' ]; // returns [ 5, 3, 1 ] z = y[ '1:4' ]; // returns [ 2, 3, 4 ] // Slice assignment: y[ '4:1:-1' ] = 10; z = y[ ':' ]; // returns [ 1, 2, 10, 10, 10, 6 ] y[ '2:5' ] = [ -10, -9, -8 ]; z = y[ ':' ]; // returns [ 1, 2, -10, -9, -8, 6 ] // Array index retrieval: var idx = array2fancy.idx; var i = idx( [ 1, 3, 4 ] ); // integer index array z = y[ i ]; // returns [ 2, -9, -8 ] i = idx( [ true, false, false, true, true, true ] ); // boolean array z = y[ i ]; // returns [ 1, -9, -8, 6 ] i = idx( new BooleanArray( [ true, false, false, true, true, true ] ) ); // boolean array z = y[ i ]; // returns [ 1, -9, -8, 6 ] i = idx( new Uint8Array( [ 0, 0, 1, 0, 0, 1 ] ) ); // mask array z = y[ i ]; // returns [ 1, 2, -9, -8 ] i = idx( new Int32Array( [ 0, 0, 1, 1, 2, 2 ] ) ); // integer index array z = y[ i ]; // returns [ 1, 1, 2, 2, -10, -10 ] // Array index assignment: x = [ 1, 2, 3, 4, 5, 6 ]; y = array2fancy( x ); i = idx( [ true, false, true, false, true, false ] ); // boolean array y[ i ] = 5; z = y[ ':' ]; // returns [ 5, 2, 5, 4, 5, 6 ] i = idx( new BooleanArray( [ true, false, true, false, true, false ] ) ); // boolean array y[ i ] = 7; z = y[ ':' ]; // returns [ 7, 2, 7, 4, 7, 6 ] i = idx( new Uint8Array( [ 1, 1, 1, 0, 0, 0 ] ) ); // mask array y[ i ] = 8; z = y[ ':' ]; // returns [ 7, 2, 7, 8, 8, 8 ] i = idx( new Int32Array( [ 5, 3, 2 ] ) ); // integer index array y[ i ] = [ 9, 10, 11 ]; z = y[ ':' ]; // returns [ 7, 2, 11, 10, 8, 9 ] i = idx( [ 0, 1 ] ); // integer index array y[ i ] = -1; z = y[ ':' ]; // returns [ -1, -1, 11, 10, 8, 9 ] ```

* * * ## Notice This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib]. #### Community [![Chat][chat-image]][chat-url] --- ## License See [LICENSE][stdlib-license]. ## Copyright Copyright © 2016-2025. The Stdlib [Authors][stdlib-authors].

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  Standard library for JavaScript and Node.js.

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npmjs.org: @stdlib/array-to-fancy

Convert an array to an object supporting fancy indexing.

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@stdlib/array-to-fancy

Science Score: 44.0%

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array2fancy

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npmjs.org: @stdlib/array-to-fancy

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