Remove Last Two Characters in a String

Question

Is there a quick way to remove the last two characters in a String in Swift? I see there is a simple way to remove the last character as clearly noted here. Do you know ho

Answer 1

update: Xcode 9 • Swift 4 or later

String now conforms to RangeReplaceableCollection so you can use collection method dropLast straight in the String and therefore an extension it is not necessary anymore. The only difference is that it returns a Substring. If you need a String you need to initialize a new one from it:

let string = "0123456789"
let substring1 = string.dropLast(2)         // "01234567"
let substring2 = substring1.dropLast()      // "0123456"
let result = String(substring2.dropLast())  // "012345"

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We can also extend LosslessStringConvertible to add trailing syntax which I think improves readability:

extension LosslessStringConvertible {
    var string: String { .init(self) }
}

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Usage:

let result = substring.dropLast().string

Answer 2

Better to use removeLast()

var myString = "Hello world"
myString.removeLast(2)

output : "Hello wor"

Answer 3

Use removeSubrange(Range<String.Index>) just like:

var str = "Hello, playground"
str.removeSubrange(Range(uncheckedBounds: (lower: str.index(str.endIndex, offsetBy: -2), upper: str.endIndex)))

This will crash if the string is less than 2 characters long. Is that a requirement for you?

Answer 4

var name: String = "Dolphin"
let endIndex = name.index(name.endIndex, offsetBy: -2)
let truncated = name.substring(to: endIndex)
print(name)      // "Dolphin"
print(truncated) // "Dolph"

Answer 5

swift 4:

let str = "Hello, playground"
let newSTR1 = str.dropLast(3)
print(newSTR1) 

output: "Hello, playgro"

//---------------//

let str = "Hello, playground"
let newSTR2 = str.dropFirst(2)
print(newSTR2)

output: "llo, playground"