How can I perform operations in JavaScript just like we do pipeline of operations in Java streams?

Question

In Java 8 using streams when I chain methods one after the another the execution of operations are performed in pipelined manner.

Example:

List

        

Answer 1

Maybe later (or never) you can use the actual experimental pipeline operator |>, which has the following syntax:

expression |> function

Your wanted result could be achieved by taking the functions as separate functions and iterate the stream array for each pipe.

This works only in FF. From version 58: this feature is behind the --enable-pipeline-operator compile flag.

const
    a = x => { x = x * x; console.log("map1=" + x); return x; },
    b = x => { x = x * 3; console.log("map2=" + x); return x; },
    c = x => console.log("forEach=" + x)

var nums = [1, 2, 3, 4, 5, 6];

nums.forEach(v => v |> a |> b |> c);

The same with a pipe as function (function composition enabling piping) with a closure over the wanted functions.

const
    pipe = (...functions) => input => functions.reduce((acc, fn) => fn(acc), input),
    a = x => { x = x * x; console.log("map1=" + x); return x; },
    b = x => { x = x * 3; console.log("map2=" + x); return x; },
    c = x => console.log("forEach=" + x)

var nums = [1, 2, 3, 4, 5, 6],
    pipeline = pipe(a, b, c);

nums.forEach(pipeline);