kubernetes/vendor/github.com/stoewer/go-strcase/helper.go

// isLower checks if a character is lower case. More precisely it evaluates if it is
// in the range of ASCII character 'a' to 'z'.
func isLower(ch rune) bool { … }

// toLower converts a character in the range of ASCII characters 'A' to 'Z' to its lower
// case counterpart. Other characters remain the same.
func toLower(ch rune) rune { … }

// isLower checks if a character is upper case. More precisely it evaluates if it is
// in the range of ASCII characters 'A' to 'Z'.
func isUpper(ch rune) bool { … }

// toLower converts a character in the range of ASCII characters 'a' to 'z' to its lower
// case counterpart. Other characters remain the same.
func toUpper(ch rune) rune { … }

// isSpace checks if a character is some kind of whitespace.
func isSpace(ch rune) bool { … }

// isDelimiter checks if a character is some kind of whitespace or '_' or '-'.
func isDelimiter(ch rune) bool { … }

type iterFunc …

// stringIter iterates over a string, invoking the callback for every single rune in the string.
func stringIter(s string, callback iterFunc) { … }