Count uppercase and lowercase

Goal

Finish two functions that count the upper-case and lower-case letters in Text. Use range to visit each character, and use continue to skip anything that is not a letter.

Example

If Text were "Go 2!", then UpperCount() is 1 (the G) and LowerCount() is 1 (the o). The space, the 2 and the ! are skipped, not counted.

Here is the same idea counting vowels, so you can see the shape:

func VowelCount() int {
	count := 0
	for _, r := range Text {
		if !unicode.IsLetter(r) {
			continue
		}
		if r == 'a' || r == 'e' || r == 'i' || r == 'o' || r == 'u' {
			count++
		}
	}
	return count
}

The counter is declared before the loop, so it builds up instead of resetting. continue ends a pass early for anything that is not a letter.

Rules

• Edit letters.go. Add import "unicode" at the top of the file.
• UpperCount returns how many upper-case letters are in Text. LowerCount returns how many lower-case letters.
• In both functions, declare a counter before the loop and loop with for _, r := range Text.
• Use continue to skip runes that are not letters. Digits, spaces and punctuation are never counted.
• Use unicode.IsLetter, unicode.IsUpper and unicode.IsLower, so letters like É and é count too.
• An empty Text gives 0 for both.
• The tests change Text, so use the variable. Do not type text into the functions.
• Do not change the var Text line or the first line of each function.

What you'll practice

range over a string, continue to skip a pass, and a counter declared before the loop.

Run it

gonomicon fetch week-1/11-06-letter-case-counts
cd 11-06-letter-case-counts
gonomicon test
gonomicon submit

Hints

1. You need a counter that starts at 0 before the loop, then a loop that visits every rune of Text. Do this once in each function.
2. Use for _, r := range Text. Inside, if r is not a letter, continue to skip it. Then if the letter is upper case (unicode.IsUpper), add 1 to the counter. LowerCount is the same with unicode.IsLower.
3. count := 0, then for _, r := range Text { if !unicode.IsLetter(r) { continue }; if unicode.IsUpper(r) { count++ } }, then return count. Add import "unicode" at the top of the file.