As an exercise I repeated this Java question, but in Go: Convert string to mixed case Convert string to mixed case
As an exercise I repeated this Java question, but in Go: Convert string to mixed case
As an exercise I repeated this Java question, but in Go: Convert string to mixed case
Alternate letters to UpperCase
As an exercise I repeated this Java question, but in Go: Convert string to mixed case
The objective is for every second letter to be converted to uppercase.
Go string processing is relatively new to me, and I am looking for feedback on the use of the unicode package, any other go language or library features I should be using, and of course, issues with style, convention, or possible bugs.
I have put the following in the playground as well.
package kata
import (
"unicode"
)
// AlternateCase will return the input string modified such that alternate letters are transformed to uppercase.
//
// Note that non-letters are ignored, so in the input string `a!b` the `!` is ignored, so `b` is the second letter.
// The result of AlternateCase on `a!b` is `A!b`.
func AlternateCase(input string) string {
runes := make([]rune, 0, len(input))
var upper bool
for _, c := range input {
if unicode.IsLetter(c) {
upper = !upper
if upper {
c = unicode.ToUpper(c)
}
}
runes = append(runes, c)
}
return string(runes)
}
I have also written some test cases, and a documentation example:
package kata
import (
"fmt"
"testing"
)
func TestAlternateCase(t *testing.T) {
cases := []struct{ input, output string }{
{"hello, world!", "HeLlO, wOrLd!"},
{"a!b", "A!b"},
{"AAAA", "AAAA"},
{"", ""},
{"h", "H"},
{"!h", "!H"},
{"日本語", "日本語"},
{"f日u本b語ar", "F日U本B語Ar"},
}
for _, c := range cases {
got := AlternateCase(c.input)
if got != c.output {
t.Errorf("For input '%v' expect '%v' but got '%v'", c.input, c.output, got)
}
}
}
func ExampleAlternateCase() {
hi := "hello, world!"
fmt.Printf("The AlternateCase of '%v' is '%v'\n", hi, AlternateCase(hi))
// Output: The AlternateCase of 'hello, world!' is 'HeLlO, wOrLd!'
}
I am looking for feedback on the test mechanisms as well.