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Chapter 1. Getting Started
- Starting a new project
Chapter 2. Strings
Chapter 3. Numbers
Chapter 4. Data Structures
- Using associative arrays
Chapter 5. Good Coding Practices
Chapter 6. Files and I/O
Chapter 7. Dates and Times
Chapter 9. Testing and Debugging
Chapter 10. Data Formats and Serialization
Chapter 11. HTML and the Web

Chapter 1. Getting Started
- Starting a new project
Chapter 2. Strings
Chapter 3. Numbers
Chapter 4. Data Structures
- Using associative arrays
Chapter 5. Good Coding Practices
Chapter 6. Files and I/O
Chapter 7. Dates and Times
Chapter 9. Testing and Debugging
Chapter 10. Data Formats and Serialization
Chapter 11. HTML and the Web

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Chapter 9. Testing and Debugging

JavaScript Chapter 9.
Testing and Debugging

Printing debug output

Javascript makes it super easy to print debug output using console.log().

Using an interactive shell (REPL)

Node.js ships with a REPL accessible via the terminal.

Using a debugger

Here’s a bit of JavaScript code that’s not behaving as expected.

Writing tests

Jest is a popular testing framework that provides a friendly API for writing unit tests in JavaScript.