Rediscovering JavaScript

Wrapping Up

JavaScript is a very powerful language with some unpleasant surprises. You learned to be careful about automatic insertion of ;, to use === instead of ==, and to declare variables before use. We also discussed a few ways to proactively deal with the gotchas—by using the ’use strict’; directive and lint tools. In the next chapter we will discuss how a very fundamental task of declaring variables has changed, for the better, in JavaScript.

Exercises

Take a break and practice, using these code exercises, to identify some potential errors in code and ways to improve writing JavaScript. You can find answers to these exerciseshere.

Exercise 1

What will be the result of each of the following return statements?

return
 2 * 3;

return 2 ...