
Security News
TypeScript is Porting Its Compiler to Go for 10x Faster Builds
TypeScript is porting its compiler to Go, delivering 10x faster builds, lower memory usage, and improved editor performance for a smoother developer experience.
compose-function
Advanced tools
The compose-function npm package provides utility functions for function composition, allowing you to combine multiple functions into a single function. This is particularly useful in functional programming paradigms where you want to create complex operations by combining simpler ones.
compose
The `compose` function allows you to combine multiple functions into a single function. In this example, `addThenMultiply` first adds 1 to the input and then multiplies the result by 2.
const compose = require('compose-function');
const add = x => x + 1;
const multiply = x => x * 2;
const addThenMultiply = compose(multiply, add);
console.log(addThenMultiply(5)); // Output: 12
pipe
The `pipe` function is similar to `compose` but applies functions from left to right. In this example, `multiplyThenAdd` first multiplies the input by 2 and then adds 1.
const { pipe } = require('compose-function');
const add = x => x + 1;
const multiply = x => x * 2;
const multiplyThenAdd = pipe(add, multiply);
console.log(multiplyThenAdd(5)); // Output: 11
Lodash is a popular utility library that provides a wide range of functions for common programming tasks, including function composition. The `_.flow` and `_.flowRight` methods in Lodash offer similar functionality to `compose` and `pipe` in compose-function.
Ramda is a functional programming library for JavaScript that emphasizes immutability and side-effect-free functions. It provides `R.compose` and `R.pipe` functions, which are similar to the compose-function package but come with additional functional programming utilities.
Redux is a state management library for JavaScript applications. It includes a `compose` function that is often used to apply multiple middleware functions in a Redux store. While its primary focus is state management, its `compose` function can be used similarly to the compose-function package.
Installation |
Usage |
Related |
License
logo by Justin Mezzell
Compose a new function from smaller functions `f(g(x))`
npm install compose-function
import compose from 'compose-function';
const composition = compose(sqr, add2); // sqr(add2(x))
composition(2) // => 16
compose(sqr, inc)(2); // => 9
compose(inc, sqr)(2); // => 5
import compose from 'compose-function';
import { curry, _ } from 'curry-this';
const add = (x, y) => x + y;
// add(6, sqr(add(2, x)))
compose(
add::curry(6),
sqr,
add::curry(2),
);
// map(filter(list, even), sqr)
compose(
map::curry(_, sqr),
filter::curry(_, even),
)([1,2,3,4,5,6,7,8]) // => [4, 16, 36, 64]
::
huh?If you’re wondering what the ::
thing means, you’d better read this excellent overview by @jussi-kalliokoski or have a look at the function bind syntax proposal.
Or checkout the curry-this docs.
MIT © Christoph Hermann
FAQs
Compose new functions f(g(x))
The npm package compose-function receives a total of 904,053 weekly downloads. As such, compose-function popularity was classified as popular.
We found that compose-function demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
TypeScript is porting its compiler to Go, delivering 10x faster builds, lower memory usage, and improved editor performance for a smoother developer experience.
Research
Security News
The Socket Research Team has discovered six new malicious npm packages linked to North Korea’s Lazarus Group, designed to steal credentials and deploy backdoors.
Security News
Socket CEO Feross Aboukhadijeh discusses the open web, open source security, and how Socket tackles software supply chain attacks on The Pair Program podcast.