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Radashi

compose

Create a composition of functions

78 bytes

Usage

In a composition of functions, each function is given the next function as an argument and must call it to continue executing.

import * as 
import _
_ from 'radashi'


const 
const useZero: (fn: any) => () => any
useZero = (
fn: any
fn: any) => () => 
fn: any
fn(0)
const 
const objectize: (fn: any) => (num: any) => any
objectize = (
fn: any
fn: any) => (
num: any
num: any) => 
fn: any
fn({ 
num: any
num })
const 
const increment: (fn: any) => ({ num }: any) => any
increment =
  (
fn: any
fn: any) =>
  ({ 
num: any
num }: any) =>
    
fn: any
fn({ 
num: any
num: 
num: any
num + 1 })
const 
const returnArg: (arg: any) => (args: any) => any
returnArg = (
arg: any
arg: any) => (
args: any
args: any) => 
args: any
args[
arg: any
arg]


const 
const composed: () => any
composed = 
import _
_.
compose<any, [], [num: any], [any], any, [any], any, [args: any], any, any>(f1: (next: (num: any) => any) => () => any, f2: (next: (args_0: any) => any) => (num: any) => any, f3: (next: (args_0: any) => any) => (args_0: any) => any, f4: (next: (args: any) => any) => (args_0: any) => any, last: (args: any) => any): () => any (+8 overloads)
export compose
Create a function that composes multiple functions together. In a
composition of functions, each function is given the next function
as an argument and must call it to continue executing.
@see ― https://radashi.js.org/reference/curry/compose
@example 
const myComposedFunc = compose(
  (x) => x + 5,
  (x) => x * 2,
)


myComposedFunc(0)
// => 5
@version ― 12.1.0
compose(
  
const useZero: (fn: any) => () => any
useZero,
  
const objectize: (fn: any) => (num: any) => any
objectize,
  
const increment: (fn: any) => ({ num }: any) => any
increment,
  
const increment: (fn: any) => ({ num }: any) => any
increment,
  
const returnArg: (arg: any) => (args: any) => any
returnArg('num'),
)


const composed: () => any
composed() // => 2

This can be a little jarring if you haven’t seen it before. Here’s a broken down composition. It’s equivalent to the code above.

const decomposed = useZero(objectize(increment(increment(_.returnArg('num')))))


decomposed() // => 2