Swift Language Strings and Characters Concatenate strings
Example
Concatenate strings with the + operator to produce a new string:
let name = "John"
let surname = "Appleseed"
let fullName = name + " " + surname // fullName is "John Appleseed"
Append to a mutable string using the += compound assignment operator, or using a method:
let str2 = "there"
var instruction = "look over"
instruction += " " + str2 // instruction is now "look over there"
var instruction = "look over"
instruction.append(" " + str2) // instruction is now "look over there"
Append a single character to a mutable String:
var greeting: String = "Hello"
let exclamationMark: Character = "!"
greeting.append(exclamationMark)
// produces a modified String (greeting) = "Hello!"
Append multiple characters to a mutable String
var alphabet:String = "my ABCs: "
alphabet.append(contentsOf: (0x61...0x7A).map(UnicodeScalar.init)
.map(Character.init) )
// produces a modified string (alphabet) = "my ABCs: abcdefghijklmnopqrstuvwxyz"
3.0
appendContentsOf(_:) has been renamed to append(_:).
Join a sequence of strings to form a new string using joinWithSeparator(_:):
let words = ["apple", "orange", "banana"]
let str = words.joinWithSeparator(" & ")
print(str) // "apple & orange & banana"
3.0
joinWithSeparator(_:) has been renamed to joined(separator:).
The separator is the empty string by default, so ["a", "b", "c"].joined() == "abc".
