Fundamentals

Variables, functions, and control flow.

5 lessons

  1. 1

    What is Javascript?

    What JavaScript does on the web, your first console.log, and how to read errors without panicking.

  2. 2

    Variables: let and const

    Store data with const and let, naming rules, and strings, numbers, and booleans.

  3. 3

    Strings and operators

    Join text, template literals, and when + adds numbers vs glues strings.

  4. 4

    Conditionals: if, else if, and else

    Make decisions in code with if, else if, and else, plus && and `

  5. 5

    Loops: for and while

    Repeat code with for and while, loop through arrays, and build running totals.