Extract Last Word in String with Swift

Question

What is the way of extracting last word in a String in Swift? So if I have \"Lorem ipsum dolor sit amet\", return \"amet\". What is the most efficient way of doing this?

Answer 1

The other answers are fine if you want to include Foundation classes. If you want to use Swift-only classes then you can do it this way:

One way to do it is to use indices. This is probably the fastest way with long strings:

Swift 4:

let str = "Lorem ipsum dolor sit amet"
let size = str.reversed().firstIndex(of: " ") ?? str.count
let startWord = str.index(str.endIndex, offsetBy: -size)
let last = str[startWord...] // -> "amet"

Or you could split the string:

Swift 4:

let str = "Lorem ipsum dolor sit amet"
let split = str.split(separator: " ")
let last    = String(split.suffix(1).joined(separator: [" "]))
let lastTwo = String(split.suffix(2).joined(separator: [" "]))

print(last)    // -> "amet"
print(lastTwo) // -> "sit amet”

Swift 3:

let str = "Lorem ipsum dolor sit amet"
let split = str.characters.split(separator: " ")
let last    = String(split.suffix(1).joined(separator: [" "]))
let lastTwo = String(split.suffix(2).joined(separator: [" "]))

print(last)    // -> "amet"
print(lastTwo) // -> "sit amet”

Swift 2:

let str = "Lorem ipsum dolor sit amet"
let split = str.characters.split(Character(" "))
let last    = String(split.suffix(1).joinWithSeparator([" "]))
let lastTwo = String(split.suffix(2).joinWithSeparator([" "]))

print(last)    // -> "amet"
print(lastTwo) // -> "sit amet"