Class 7 — Variables, classes, control structures, and error handling

Javascript topics        Javascript examples

Topics

• Single value variable types
  • Number — done in class 5 with calculator
  • String — done in class 6 with spaceling
  • Boolean
• Variables with multiple values
  • Arrays — done in class 6
  • Object literals
  • Classes
• Datatype conversion
• typeOf() — undefined and null variable types
• Program statement types
  • Declaration
  • Assignment
  • Function call
• Control structures
  • Sequence
  • Choice
  • Loop

Web console

Under tools select "Web console", then you can see the output of the function console.log(message_string).

You also get some syntactic error messages, which can be more helpful then JSLint when loading a web page.