Joined Function (jfn)

Creates a function that runs multiple functions in serial or in parallel.

Installation

Requires Node.js 6.0.0 or above.

npm i jfn

The module exports a single function.

Variadic: ...fns (one or more of: function, or array of functions): The functions to be combined into one.
Optional: Object argument:
- parallel or p (boolean): If true, runs the functions in parallel, giving the same arguments to each function, and compiling the returned results into an array. If false, runs the functions in serial, passing the result of each function to the next in the list, and returning a single value at the end. Defaults to false.
- arg (positive integer): If in serial mode, the result of each function will be passed to the next as an argument at this index. Defaults to 0.

The return value of the last function in fns (if in serial mode) or an array of fns return values (if in parallel mode).

const jfn = require('jfn')

const add1 = n => n + 1
const add2 = n => n + 2
const add3 = jfn(add1, add2)

add3(1) // 4

const jfn = require('jfn')

const add1 = n => n + 1
const add2 = n => n + 2
const add = jfn(add1, add2, {parallel: true})

add(1) // [2, 3]