Chapter 7, Transforming Functions – Currying and Partial Application

7.1. Sum as you will: The following sumMany() function does the job:

const sumMany = total => number =>
  number === undefined ? total : sumMany(total + number);

sumMany(2)(2)(9)(6)(0)(-3)(); // 16

7.2. Working stylishly: We can do currying by hand for applyStyle():

const applyStyle = style => string => `<${style}>${string}</${style}>`;

7.3. Currying by prototype: Basically, we are just transforming the curryByBind() version so that it uses this:

Function.prototype.curry = function() {
  return this.length === 0 ? this() : p => this.bind(this, p).curry();
};

You could work in a similar fashion and provide a partial() method instead.

7.4. Uncurrying the currying: We can work in a similar fashion to what we did in curryByEval():

const uncurryByEval = (fn, len) =>
...