1. JavaScript Basics
Stephen Delaney

2. Review: Working With Numbers
Doing math in JavaScript
The random challenge

3. Types of Numbers
Integers
10, -8,
Floating point numbers
3.14,
Scientific notation
5.7e+4 => 57000

4. Is this a number?
var greatNumber = ‘10’
*Introducing typeOf()

5. What are these for? += -= *= /=
var score = 10
score += 7
17

6. What’s the difference between?
parseInt()
parseInt(10.6) 10
parseFloat()
parseFloat(10.6) 10.6

7. What do these mean?
NaN
Not a Number
DRY
Don’t Repeat Yourself

8. What do these do? Math.round() Math.round(10.6)  11 Math.floor()
Math.ceil()
Math.ceil(10.6)  11

9. What does this do?
Math.random()
Floating number, from 0 (inclusive) to 1 (exclusive)

10. Challenge: Write the code to generate a random number between 1 and 10.
Math.floor(Math.random() * 10) + 1

11. Questions?