Data

Tools

Indexes

Applications

Experiments

Open Source Science

@stdlib/utils-decorate-after

Decorate a provided function such that the function's return value is provided as an argument to another function.

https://github.com/stdlib-js/utils-decorate-after

Science Score: 44.0%

This score indicates how likely this project is to be science-related based on various indicators:

  • ✓
    CITATION.cff file
    Found CITATION.cff file
  • ✓
    codemeta.json file
    Found codemeta.json file
  • ✓
    .zenodo.json file
    Found .zenodo.json file
  • ○
    DOI references
  • ○
    Academic publication links
  • ○
    Committers with academic emails
  • ○
    Institutional organization owner
  • ○
    JOSS paper metadata
  • ○
    Scientific vocabulary similarity
    Low similarity (15.4%) to scientific vocabulary

Keywords

decorate decorator fcn fun func function functional javascript node node-js nodejs stdlib transform util utilities utils
Last synced: 6 months ago · JSON representation ·

Repository

Decorate a provided function such that the function's return value is provided as an argument to another function.

Basic Info
Statistics
  • Stars: 1
  • Watchers: 3
  • Forks: 0
  • Open Issues: 0
  • Releases: 0
Topics
decorate decorator fcn fun func function functional javascript node node-js nodejs stdlib transform util utilities utils
Created over 3 years ago · Last pushed 6 months ago
Metadata Files
Readme Changelog Contributing License Code of conduct Citation Security

README.md

About stdlib...

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!

decorateAfter

NPM version Build Status Coverage Status <!-- dependencies -->

Decorate a provided function such that the function's return value is provided as an argument to another function.

## Installation ```bash npm install @stdlib/utils-decorate-after ``` 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 decorateAfter = require( '@stdlib/utils-decorate-after' ); ``` #### decorateAfter( fcn, arity, after\[, thisArg] ) Decorates a provided function such that the function's return value is provided as an argument to another function. ```javascript var abs = require( '@stdlib/math-base-special-abs' ); function negate( v ) { return -v; } var f = decorateAfter( abs, abs.length, negate ); // returns var bool = ( abs.length === f.length ); // returns true var v = f( -5 ); // returns -5 v = f( 5 ); // returns -5 ``` Decorators are intended to be transparent, meaning that, when interfacing with an API, the decorated API should have the same signature (i.e., number of parameters) as the decorated function. Thus, a typical value for `arity` is `fcn.length`. This function does not require equality, however, and the `arity` argument is allowed to diverge from that of the decorated function. Specifying a differing `arity` does **not** affect function evaluation behavior, as the returned function passes all provided arguments to the decorated function. ```javascript var abs = require( '@stdlib/math-base-special-abs' ); function negate( v ) { return -v; } var f = decorateAfter( abs, 0, negate ); // returns var bool = ( abs.length === f.length ); // returns false var v = f( -5 ); // returns -5 v = f( 5 ); // returns -5 ``` To specify the function execution context for `after`, provide a `thisArg` argument. ```javascript var abs = require( '@stdlib/math-base-special-abs' ); function counter() { this.count += 1; } var ctx = { 'count': 0 }; var f = decorateAfter( abs, abs.length, counter, ctx ); // returns var v = f( -5 ); // returns 5 v = f( 5 ); // returns 5 var count = ctx.count; // returns 2 ``` #### decorateAfter.factory( fcn, arity, after\[, thisArg] ) Uses code generation to decorate a provided function such that the function's return value is provided as an argument to another function. ```javascript var abs = require( '@stdlib/math-base-special-abs' ); function negate( v ) { return -v; } var f = decorateAfter.factory( abs, abs.length, negate ); // returns var bool = ( abs.length === f.length ); // returns true var v = f( -5 ); // returns -5 v = f( 5 ); // returns -5 ``` Argument behavior is the same as for `decorateAfter` above.
## Notes - If the `after` function returns `undefined`, the returned decorator returns the return value of the decorated function `fcn`; otherwise, the returned decorator returns the return value of `after`. - Code generation may be problematic in browser contexts enforcing a strict [content security policy][mdn-csp] (CSP). If running in or targeting an environment with a CSP, avoid using code generation. - For non-native functions, the code generation API supports returning a decorator whose API exactly matches the API of the decorated function, including function length and parameter names. For native functions, due to how native functions serialize to strings, the code generation API generates placeholder parameter names, which are unlikely to match the canonical parameter names. Using placeholder parameter names ensures that the length of the decorator (i.e., number of parameters) matches the decorated function and, except in scenarios involving function source code inspection, will not affect runtime behavior. - For the non-code generation API, the returned decorator supports an `arity` less than or equal to `10` (i.e., the maximum arity of the returned function is `10`). For an arity greater than `10`, the returned function has an arity equal to `0`. While this violates strict notions of a decorator, for all practical purposes, this is unlikely to be an issue, as the vast majority of functions have fewer than `10` parameters and the need for explicitly checking function length is relatively uncommon. - The decorators returned by the code generation and non-code generation APIs should have the same performance characteristics, and, thus, neither API should have a performance advantage over the other. The main advantage of the code generation API is the ability to return a decorator whose signature exactly matches the signature of a non-native decorated function. - Common use cases for decorating a function with additional actions **after** invocation include logging, capturing invocation statistics, and validating return values.
## Examples ```javascript var discreteUniform = require( '@stdlib/random-base-discrete-uniform' ); var format = require( '@stdlib/string-format' ); var decorateAfter = require( '@stdlib/utils-decorate-after' ); function count() { this.count += 1; } function greet() { return 'Hello!'; } function randstr( f ) { var str; var i; str = []; for ( i = 0; i < discreteUniform( 1, 10 ); i++ ) { str.push( f() ); } return str.join( ' ' ); } // Create an evaluation context to allow tracking how many times a function is invoked: var ctx = { 'count': 0 }; // Decorate a function with a counter: var f = decorateAfter( greet, greet.length, count, ctx ); // Generate a random greeting: var str = randstr( f ); // returns // Check how many times the function was invoked: var c = ctx.count; // returns ```
* * * ## 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].

Owner

  • Name: stdlib
  • Login: stdlib-js
  • Kind: organization

Standard library for JavaScript.

Citation (CITATION.cff) 

cff-version: 1.2.0
title: stdlib
message: >-
  If you use this software, please cite it using the
  metadata from this file.

type: software

authors:
  - name: The Stdlib Authors
    url: https://github.com/stdlib-js/stdlib/graphs/contributors

repository-code: https://github.com/stdlib-js/stdlib
url: https://stdlib.io

abstract: |
  Standard library for JavaScript and Node.js.

keywords:
  - JavaScript
  - Node.js
  - TypeScript
  - standard library
  - scientific computing
  - numerical computing
  - statistical computing

license: Apache-2.0 AND BSL-1.0

date-released: 2016

GitHub Events

Total
  • Push event: 38
Last Year
  • Push event: 38

Committers

Last synced: 8 months ago

All Time
  • Total Commits: 43
  • Total Committers: 1
  • Avg Commits per committer: 43.0
  • Development Distribution Score (DDS): 0.0
Past Year
  • Commits: 12
  • Committers: 1
  • Avg Commits per committer: 12.0
  • Development Distribution Score (DDS): 0.0
Top Committers
Name Email Commits
stdlib-bot n****y@s****o 43
Committer Domains (Top 20 + Academic)
stdlib.io: 1

Issues and Pull Requests

Last synced: 6 months ago

All Time
  • Total issues: 0
  • Total pull requests: 0
  • Average time to close issues: N/A
  • Average time to close pull requests: N/A
  • Total issue authors: 0
  • Total pull request authors: 0
  • Average comments per issue: 0
  • Average comments per pull request: 0
  • Merged pull requests: 0
  • Bot issues: 0
  • Bot pull requests: 0
Past Year
  • Issues: 0
  • Pull requests: 0
  • Average time to close issues: N/A
  • Average time to close pull requests: N/A
  • Issue authors: 0
  • Pull request authors: 0
  • Average comments per issue: 0
  • Average comments per pull request: 0
  • Merged pull requests: 0
  • Bot issues: 0
  • Bot pull requests: 0
View more stats
Top Authors
Issue Authors
Pull Request Authors
Top Labels
Issue Labels
Pull Request Labels

Packages

  • Total packages: 1
  • Total downloads: unknown
  • Total dependent packages: 3
  • Total dependent repositories: 1
  • Total versions: 5
  • Total maintainers: 4
npmjs.org: @stdlib/utils-decorate-after

Decorate a provided function such that the function's return value is provided as an argument to another function.

  • Homepage: https://stdlib.io
  • License: Apache-2.0
  • Latest release: 0.2.2
    published over 1 year ago
  • Versions: 5
  • Dependent Packages: 3
  • Dependent Repositories: 1
  • Downloads: 0 Last month
Rankings
Dependent packages count: 5.9%
Dependent repos count: 10.3%
Forks count: 15.4%
Average: 15.8%
Stargazers count: 16.7%
Downloads: 30.7%
Maintainers (4)
planeshifter rreusser stdlib-bot kgryte
Funding
  • type: opencollective
  • url: https://opencollective.com/stdlib
Last synced: 6 months ago

Dependencies

package.json npm
  • @stdlib/bench ^0.0.x development
  • @stdlib/math-base-assert-is-nan ^0.0.x development
  • @stdlib/math-base-ops-add ^0.0.x development
  • @stdlib/math-base-special-abs ^0.0.x development
  • @stdlib/random-base-discrete-uniform ^0.0.x development
  • @stdlib/utils-noop ^0.0.x development
  • istanbul ^0.4.1 development
  • tap-spec 5.x.x development
  • tape git+https://github.com/kgryte/tape.git#fix/globby development
  • @stdlib/assert-is-function ^0.0.x
  • @stdlib/assert-is-nonnegative-integer ^0.0.x
  • @stdlib/function-ctor ^0.0.x
  • @stdlib/function-to-string ^0.0.x
  • @stdlib/regexp-native-function ^0.0.x
  • @stdlib/string-format ^0.0.x
  • @stdlib/utils-define-nonenumerable-read-only-property ^0.0.x
.github/workflows/benchmark.yml actions
  • actions/checkout v3 composite
  • actions/setup-node v3 composite
.github/workflows/cancel.yml actions
  • styfle/cancel-workflow-action 0.11.0 composite
.github/workflows/close_pull_requests.yml actions
  • superbrothers/close-pull-request v3 composite
.github/workflows/examples.yml actions
  • actions/checkout v3 composite
  • actions/setup-node v3 composite
.github/workflows/npm_downloads.yml actions
  • actions/checkout v3 composite
  • actions/setup-node v3 composite
  • actions/upload-artifact v3 composite
  • distributhor/workflow-webhook v3 composite
.github/workflows/productionize.yml actions
  • act10ns/slack v1 composite
  • actions/checkout v3 composite
  • actions/setup-node v3 composite
  • stdlib-js/bundle-action main composite
  • stdlib-js/transform-errors-action main composite
.github/workflows/publish.yml actions
  • JS-DevTools/npm-publish v1 composite
  • act10ns/slack v1 composite
  • actions/checkout v3 composite
  • actions/setup-node v3 composite
  • styfle/cancel-workflow-action 0.11.0 composite
.github/workflows/test.yml actions
  • act10ns/slack v1 composite
  • actions/checkout v3 composite
  • actions/setup-node v3 composite
.github/workflows/test_bundles.yml actions
  • act10ns/slack v1 composite
  • actions/checkout v3 composite
  • actions/setup-node v3 composite
  • denoland/setup-deno v1 composite
.github/workflows/test_coverage.yml actions
  • act10ns/slack v1 composite
  • actions/checkout v3 composite
  • actions/setup-node v3 composite
  • codecov/codecov-action v3 composite
  • distributhor/workflow-webhook v3 composite
.github/workflows/test_install.yml actions
  • act10ns/slack v1 composite
  • actions/checkout v3 composite
  • actions/setup-node v3 composite