Swift String API 정리

접두어, 접미어 확인 

var derrickName = "derrick"

print(derrickName.hasPrefix("der"))
print(derrickName.hasSuffix("ick"))

대소문자 변환 

var convertedString: String = ""

convertedString = derrickName.uppercased()
print(convertedString)
convertedString = derrickName.lowercased()
print(convertedString)