JavaScript: Accepts a converging function and a list of branching functions
JavaScript fundamental (ES6 Syntax): Exercise-68 with Solution
Converge Function with Branching Functions
Write a JavaScript program that accepts a converging function and a list of branching functions. It returns a function that applies each branching function to the arguments. The results of the branching functions are passed as arguments to the converging function.
- Use Array.prototype.map() and Function.prototype.apply() to apply each function to the given arguments.
- Use the spread operator (...) to call converger with the results of all other functions.
Sample Solution:
JavaScript Code:
//#Source https://bit.ly/2neWfJ2
// Define a function 'converge' that takes a 'converger' function and an array of functions 'fns' as arguments and returns a new function.
const converge = (converger, fns) => (...args) =>
converger(...fns.map(fn => fn.apply(null, args)));
// Define functions 'average' and 'sum'.
const average = converge((a, b) => a / b, [
arr => arr.reduce((a, v) => a + v, 0),
arr => arr.length
]);
// Example usage:
console.log(average([6, 7])); // Output: 6.5
console.log(average([1, 2, 3, 4, 5, 6, 7])); // Output: 4
Output:
6.5 4
Visual Presentation:
Flowchart:

Live Demo:
See the Pen javascript-basic-exercise-68-1 by w3resource (@w3resource) on CodePen.
For more Practice: Solve these Related Problems:
- Write a JavaScript program that accepts multiple branching functions and a converging function to merge their outputs.
- Write a JavaScript function that applies several functions to the same arguments and then passes all results to a final function.
- Write a JavaScript program that demonstrates convergent composition by processing inputs through parallel functions and combining their outputs.
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