ruby · level 1 · unit 1 · lesson 1
- meet it
- guess first
- your turn
- fix it
- nailed it
Tap a green word if you get lost.
meet it
is a list of instructions for a computer.
Code is instructions written down for a computer. A set of instructions that does one job, like a recipe for a cup of tea, is called a .
The computer follows a program exactly, starting at the top line and working down. It never guesses what you meant. It does what you wrote.
We will write our code in Ruby, a language built to be friendly for people to read. When you a program, the computer starts following it.
puts "Hello!"Press run on this one-line program and the computer says Hello! back to you.
guess first
Spot the typo. What will the computer show?
Guess before you run it. Wrong guesses are how you learn, and nothing is marked.
puts "See you tomorow, Grandad!"your turn
Your turn. Teach the computer to make a sandwich.
Think of a filling and type a step for it between the quotes on line 2, like Add some cheese. Then press run and watch the steps appear in order.
fix it
Cake before candles? Can you fix it?
- The computer runs the lines from top to bottom. Which one happens first here?
- Eating the cake first leaves nothing to blow the candles out on. The two lines are in the wrong order.
- Swap the two lines so the candles line is on top, then press run.
nailed it
you wrote and ran your first program. :D
- Code is a list of instructions for a computer.
- A program runs from the top line down.
- The computer does exactly what you write, not what you meant.
new words in your collection
- code
- program
- run
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