Function Composition

Function CompositionCodewars

Approach

Find pattern

• it should use rest parameter for getting unlimited parameters

• should use currying

Solve the problem

1. get functions as arguments

2. return lambda function and get arguments

3. triggering functions last to first. initialize with arguments

Solution

JavaScript

// Function Composition
// https://www.codewars.com/kata/5421c6a2dda52688f6000af8


const compose = (...functions) => (...args) => {
  return functions.reduceRight((acc, cur) => {
    if (Array.isArray(acc)) {
      return cur(...acc);
    }
    return cur(acc);
  }, args);
};

Best practice on codewars

JavaScript

function compose(f, g) {
  return function () {
    return f(g.apply(this, arguments));
  };
}