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Stephen Delaney sdelaney@skokielibrary

Stephen Delaney sdelaney@skokielibrary.info. JavaScript Basics. Review: Working With Numbers Doing math in JavaScript The random challenge. Types of Numbers Integers 10, -8, 2787382 Floating point numbers 3.14, -10.6454 Scientific notation 5.7e+4 => 57000. Is this a number?

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Stephen Delaney sdelaney@skokielibrary

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  1. Stephen Delaney sdelaney@skokielibrary.info • JavaScript Basics

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

  3. Types of Numbers Integers • 10, -8, 2787382 Floating point numbers • 3.14, -10.6454 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.floor(10.6)  10 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?

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