Chapter 10: Testing and Debugging

Errors and bugs are a fact of life in programming ― they will always be there. A ninja programmer will try to do everything to minimize errors occurring, and find ways to identify and deal with them quickly.

In this chapter, we’ll cover the following topics:

  • Errors, exceptions, and warnings

  • The importance of testing and debugging

  • Strict mode

  • Debugging in the browser

  • Error objects

  • Throwing exceptions

  • Exception handling

  • Testing frameworks

  • Our project ― we'll add some log messages and tests to the Quiz Ninja application

Errors, Exceptions, and Warnings

Errors are caused when something goes wrong in a program. They are usually caused by one of the following:

  • System error ― there’s a problem with the ...

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