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
// Define a function 'compose' that takes any number of functions as arguments and returns a new function.
const compose = (...fns) => fns.reduce((f, g) => (...args) => f(g(...args)));

// Define functions 'add5' and 'multiply'.
const add5 = x => x + 5;
const multiply = (x, y) => x * y;

// Create a new function 'multiplyAndAdd5' by composing 'add5' and 'multiply'.
const multiplyAndAdd5 = compose(

// Example usage:
console.log(multiplyAndAdd5(5, 2)); // Output 15



Visual Presentation:

JavaScript Fundamental: Perform right-to-left function composition


flowchart: Perform left-to-right function composition

Live Demo:

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

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Previous: Write a JavaScript program to add special characters to text to print in color in the console (combined with console.log()).
Next: Write a JavaScript program to perform left-to-right function composition.

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