Count the charms

Goal

Fill in two functions: RuneCount returns how many symbols Word holds, and ExtraBytes returns how many more bytes than symbols it takes up.

Example

For Word = "héllo", there are 5 symbols but 6 bytes, because é takes two bytes.

Word = "héllo"
fmt.Println(RuneCount())  // 5
fmt.Println(ExtraBytes()) // 1

For plain English text such as "hello", both counts match, so ExtraBytes() is 0.

Rules

• Edit symbols.go. Each function has a // TODO comment and a return line you will change.
• Word is a variable outside the functions. The tests give it different values, so read Word each time the functions run.
• Count symbols with utf8.RuneCountInString. You will need import "unicode/utf8" at the top of the file.
• ExtraBytes is the number of bytes minus the number of symbols. It is never negative.
• Do not change the line var Word string or the func lines.

What you'll practice

Telling bytes apart from symbols: len counts bytes, and utf8.RuneCountInString counts runes.

Run it

gonomicon fetch week-1/09-02-count-the-symbols
cd 09-02-count-the-symbols
gonomicon test
gonomicon submit

Hints

1. Two numbers are in play: how many bytes (beads) and how many symbols (charms). len gives one, and utf8.RuneCountInString gives the other.
2. RuneCount should return utf8.RuneCountInString(Word). Add import "unicode/utf8" under the package line. ExtraBytes is the bytes minus the symbols.
3. RuneCount: return utf8.RuneCountInString(Word). ExtraBytes: return len(Word) - utf8.RuneCountInString(Word).