JavaScript: Perform right-to-left function composition

JavaScript fundamental (ES6 Syntax): Exercise-66 with Solution

Write a JavaScript program to perform right-to-left function composition.

• Use Array.prototype.reduce() to perform right-to-left function composition.
• The last (rightmost) function can accept one or more arguments; the remaining functions must be unary.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const compose = (...fns) => fns.reduce((f, g) => (...args) => f(g(...args)));
const add5 = x => x + 5;
const multiply = (x, y) => x * y;
const multiplyAndAdd5 = compose(
  add5,
  multiply
);
console.log(multiplyAndAdd5(5, 2)); 

Sample Output:

15

Pictorial Presentation:

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-66-1 by w3resource (@w3resource) on CodePen.

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