Swift, Strings, Characters

Online Swift Playground

//Strings
let str = "Swift"
for ch in str.unicodeScalars {
    print("char: \(ch), unicode: \(ch.value)")
}
print("chars count: \(str.count)")
print("reversed: \(String(str.reversed()))")
print(str.uppercased())
print(str.lowercased())

print("first: \(str[str.startIndex])")
print("second: \(str[str.index(str.startIndex, offsetBy: 1)])")
print("last: \(str[str.index(before: str.endIndex)])")

//strings equality
print("\"Swift\" == \"swift\":", str == "swift")

//Substrings
let str1 = "Swift is cool"
print("substr: \(str1[str1.startIndex ..< str1.firstIndex(of: " ")!])")
print("substr: \(str1[..<str1.firstIndex(of: " ")!])")
print("substr: \(str1[str1.index(after: str1.firstIndex(of: " ")!)...])")

//Split
print("split: \(str1.split() {$0 == " "})")
print(str1.split(separator: " "))
print(str1.components(separatedBy: " "))

//Chars
let ch1:Character = "5"
print("isASCII: \(ch1.isASCII)")
print("isLetter: \(ch1.isLetter)")
print("isWhitespace: \(ch1.isWhitespace)")
print("isNumber: \(ch1.isNumber)")
print("isWholeNumber: \(ch1.isWholeNumber)")
print("wholeNumberValue: \(ch1.wholeNumberValue)")