CurrentMicros returns the current microseconds.

CurrentMillis returns the current milliseconds.

IsLowerCase returns true if the rune in a-z.

IsUpperCase returns true if the rune in A-Z.

NewElapsedTimer returns a ElapsedTimer.

ToCamelCase returns a copy string by converting snake case into camel case.

ToLower returns a copy string by converting it into lower.

ToLowerCase converts rune into lower case.

ToSnakeCase returns a copy string by converting camel case into snake case.

ToUpper returns a copy string by converting it into upper.

ToUpperCase converts rune into upper case.

UnExport converts the first letter into lower case.

UpperFirst converts s[0] into upper case.

A ElapsedTimer is a timer to track the elapsed time.