Hackety Hack! Written by Krystal Salerno Presented

slide1. Hackety Hack! Written byKrystal Salerno

Presented by
_______________<br>
slide2. What is Hackety Hack? Hackety Hack is a cool Ruby-based program that makes it really easy and fun to learn coding!

You can get it at home and work on it too!

www.hackety.com<br>
slide3. Let’s get started! Click on Start
Click All Programs
Open Hackety Hack
Click on the Hackety Hack program

If you can’t find it, let us know!<br>
slide4. The basics We are going to make a simple program that just says hello!

alert “Hello ambassador!”

Click on Run in the bottom corner and watch!<br>
slide5. What is a variable? Variables are things that we can change for the computer to read

name = “Bob”
alert “My name is ” + name

Click Run!<br>
slide6. Asking questions: We can have the computer ask us questions too!

name = ask “What is your name?”
alert “Your name is ” + name

Click on Run!<br>
slide7. Let’s draw! We can make the computer draw shapes with a few commands.

Let’s use Turtle to draw a simple square.<br>
slide8. Let’s draw! Turtle.start do
forward 50
turnright 90
end

Click Run and see what happens.<br>
slide9. Let’s draw! So we only got a line, and a square has 4. How can we fix it?

Let’s copy this 4 times

forward 50
turnright 90<br>
slide10. Let’s draw! Turtle.start do
forward 50
turnright 90
forward 50
turnright 90
forward 50
turnright 90
forward 50
turnright 90
end<br>
slide11. Let’s draw! This takes too long to do, especially with more sides, so we can tell the computer to repeat itself.

When we do this we call it a loop.

We can also change the colors of the background and the line Turtle makes!<br>
slide12. Loopity Loop Turtle.start do
background maroon
pencolor honeydew
4.times do
forward 50
turnright 90
end
end<br>
slide13. Loopity Loop See how much nicer that makes it!

Let’s play with the numbers we have after forward and turnright and see what happens.<br>
slide14. Strings and Integers Who knows what the difference between
“1000”
and
1000
is?<br>
slide15. Strings and Integers “1000” is a string (The quotes “” are the key)
1000 is an integer

Strings are words or letters, must have quotes
Integers are only whole numbers<br>
slide16. Strings and Integers If we tried to do a math problem with this:

“1000” + 1 = …

The computer would give us an error, we tried adding the word “one thousand” and 1, it won’t work...<br>
slide17. Strings and Integers If we want to change “1000” to 1000, then we need to use a special command.

to_i and to_s will do the trick!

“1000”.to_i = 1000
1000.to_s = “1000”<br>
slide18. Lets Try It! Clear your editor, and let’s ask a question

sides = ask “How many sides?”

Then let’s see how we can use this in the Turtle program!<br>
slide19. Lets Try It! sides = ask “How many sides?”
Turtle.start do
sides.to_i.times do
forward 50
turnright 40
end
end<br>
slide20. Ask More Questions sides = ask “How many sides?”
steps = ask “How much should we turn?”
Turtle.start do
sides.to_i.times do
forward 50
turnright steps.to_i
end
end<br>
slide21. Ask More Questions sides = ask “How many sides?”
Turtle.start do
sides.to_i.times do
forward 50
turnright 360/sides.to_i
end
end<br>
slide22. Calculators We can make small calculators with this too!

number1 = ask “First number?”
number2 = ask “Second number?”
alert number1.to_i + number2.to_i<br>
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