meet it

The `strings` toolbox is full of tricks for text.

counts the characters in a string, spaces included, so len("cat") is 3. For more tricks, add a second line, import "strings", to bring in the strings toolbox.

makes every letter a capital, and strings.ToLower makes them small. snips spaces off both ends. swaps every copy of one piece of text for another.

None of these change your box. They hand back a new string, so store it if you want to keep it: name = strings.TrimSpace(name).

package main
import "fmt"
import "strings"
func main() {
	shout := "  hello there  "
	fmt.Println(len(shout))
	fmt.Println(strings.ToUpper(shout))
	fmt.Println(strings.TrimSpace(shout))
	fmt.Println(strings.ReplaceAll("cats and cats", "cats", "dogs"))
}

Each toolbox gets its own import line at the top, under package main.

guess first

Count carefully. What will this show?

Guess before you run it. Wrong guesses are how you learn, and nothing is marked.

package main
import "fmt"
func main() {
	fmt.Println(len("ice cream"))
}

your turn

Your turn. Crown a champion.

Type a name in the box, in small letters if you like. strings.ToUpper will shout it for you.

Your code

output

press run to see what happens

fix it

The spaces will not go away. Can you fix it?

Broken code to fix

output

press run to see what happens

Read the error on line 6. Go says the result of TrimSpace is not used.
TrimSpace hands back a tidy new string, but nothing catches it. Store it in the box.
Change line 6 to answer = strings.TrimSpace(answer), then press run.

nailed it

you learned some tricks with text. :D

len counts the characters in a string.
Import strings for ToUpper, ToLower, TrimSpace and ReplaceAll.
These hand back a new string, so store it.

new words in your collection

len
ToUpper
TrimSpace
ReplaceAll

This lesson isn’t saved. A free account remembers every lesson you finish.

The strings toolbox is full of tricks for text.

Count carefully. What will this show?

Your turn. Crown a champion.

The spaces will not go away. Can you fix it?

you learned some tricks with text. :D

The `strings` toolbox is full of tricks for text.