go · level 1 · unit 4 · lesson 4
- meet it
- guess first
- your turn
- fix it
- nailed it
Tap a green word if you get lost.
meet it
Build bigger questions with , and .
&& means and. It gives true only when both sides are true. A cake needs flour and eggs: if either one is missing, there is no cake.
|| means or. It gives true when at least one side is true, like a lie-in on Saturday or Sunday. ! means not and flips an answer, so !true is false.
A bool box already counts as a condition. So if !hasEggs { reads like plain English: if we do not have eggs.
package main
import "fmt"
func main() {
hasFlour := true
hasEggs := false
if hasFlour && hasEggs {
fmt.Println("Time to bake a cake!")
}
if !hasEggs {
fmt.Println("Off to the shop for eggs.")
}
}Write a full condition on each side, like day == "Saturday" || day == "Sunday".
guess first
Did you earn pudding? Make a guess.
Guess before you run it. Wrong guesses are how you learn, and nothing is marked.
package main
import "fmt"
func main() {
atePeas := true
ateCarrots := true
if atePeas || ateCarrots {
fmt.Println("Pudding time!")
} else {
fmt.Println("Veg first, please.")
}
}your turn
Your turn. Get on the Twister.
The Twister has two rules: you must be 8 or older, and at least 120 cm tall. Choose an age and a height that get you on.
output
press run to see what happens
fix it
Is this snack healthy? Go cannot tell. Fix it!
output
press run to see what happens
- Go stops at the
ifline. Look at the right side of||. - "banana" on its own is a string, not
trueorfalse. Each side needs a full condition. - Write the box name again: snack == "apple" || snack == "banana", then press run.
nailed it
you can ask smarter questions now. :D
&&needs both sidestrue.||needs at least one.!flipstruetofalse, andfalsetotrue.- Write a full condition on each side of
&&or||.
new words in your collection
- &&
- ||
- !
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