A simple example of curried function

curryMultiply.js

const multiply = (...params) => {
  if (params.length === 3) {
    return params[0] * params[1] * params[2];
  } else {
    return (...moreParams) => multiply(...[...params, ...moreParams]);
  }
};

const curry = fun => {
  const parameterCount = fun.length;

  return (...params) => {
    if (params.length === parameterCount) {
      return fun(...params);
    }
    return (...moreParams) => curry(fun)(...params, ...moreParams);
  };
};
const multiplyCurried = curry((a, b, c) => a * b * c);

console.log(multiply(2, 3, 4));
console.log(multiply(2)(3)(4));
console.log(multiplyCurried(2, 3, 4));
console.log(multiplyCurried(2)(3)(4));