Hello World examples

      - Lesson 0001 - Hello World in a document
      - Lesson 0002 - Hello World in an alert
      - Lesson 0003 - Hello world in a confirmation dialog box
      - Lesson 0004 - Hello World in an HTML element
      - Lesson 0005 - Hello World in the browser console
    

Arithmetic Operators

Additions

    - Lesson 0006 - Additions with values in a document
    - Lesson 0007 - Additions with values in an alert
    - Lesson 0008 - Additions with values in a confirmation dialog box
    - Lesson 0009 - Additions with values in an HTML document
    - Lesson 0010 - Additions with values in the browser console