Mastering JavaScript Functional Programming - Third Edition

Answers to Questions

Here are the solutions (partial, or worked out in full) to the questions that were contained within the chapters in this book. In many cases, there are extra questions so that you can do further work if you choose to.

Chapter 1, Becoming Functional – Several Questions

1.1 TypeScript, please! The following are the fully annotated versions of the code in the chapter. This is the code for the factorial functions:

// question_01_typescript_please.ts
function fact(n: number): number {
  if (n === 0) {
    return 1;
  } else {
    return n * fact(n - 1);
  }
}
const fact2 = (n: number): number => {
  if (n === 0) {
    return 1;
  } else {
    return n * fact2(n - 1);
  }
};
const fact3 = (n: number): number =>   n === 0 ? 1 ...