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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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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JavaScript: Tips of the Day
Chunks an array into n smaller arrays
Example:
const tips_chunkIntoN = (arr, n) => { const size = Math.ceil(arr.length / n); return Array.from({ length: n }, (v, i) => arr.slice(i * size, i * size + size) ); } console.log(tips_chunkIntoN([1, 2, 3, 4, 5, 6, 7,8], 4));
Output:
[[1,2],[3,4],[5,6],[7,8]]
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