Remove the first six characters from a String (Swift)

Question

What's the best way to go about removing the first six characters of a string? Through Stack Overflow, I've found a couple of ways that were supposed to be solutions but I noticed an error with them. For instance,

extension String {
func removing(charactersOf string: String) -> String {
    let characterSet = CharacterSet(charactersIn: string)
    let components = self.components(separatedBy: characterSet)
    return components.joined(separator: "")
}

If I type in a website like https://www.example.com, and store it as a variable named website, then type in the following

website.removing(charactersOf: "https://")

it removes the https:// portion but it also removes all h's, all t's, :'s, etc. from the text.

How can I just delete the first characters?

Use `if str.length >= 6 { let newstr = str.chopPrefix(6) }`. See http://stackoverflow.com/a/30829999/1630618 — vacawama, Apr 13 '17 at 10:14

score 57 · Answer 1 · answered Feb 07 '18 at 16:31

57

In Swift 4 it is really simple, just use dropFirst(n: Int)

let myString = "Hello World"
myString.dropFirst(6)
//World

In your case: website.dropFirst(6)

answered Feb 07 '18 at 16:31

Gefilte Fish

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I had to make a new String and pass the result of `dropFirst` to its constructor to make it compile. – Vahid Amiri Apr 02 '18 at 22:55

Alain T. · Answer 2 · 2019-02-26T12:56:46.650

34

Why not :

let stripped = String(website.characters.dropFirst(6))

Seems more concise and straightforward to me.

(it won't work with multi-char emojis either mind you)

[EDIT] Swift 4 made this even shorter:

let stripped = String(website.dropFirst(6))

edited Feb 26 '19 at 12:56

answered Sep 18 '17 at 22:02

Alain T.

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Awesome, After lots of R&D i've found best required sollution thanks. :) – steveSarsawa Feb 28 '20 at 07:31

Neethu M · Accepted Answer · 2017-04-13T09:36:20.123

15

length is the number of characters you want to remove (6 in your case)

extension String {

  func toLengthOf(length:Int) -> String {
            if length <= 0 {
                return self
            } else if let to = self.index(self.startIndex, offsetBy: length, limitedBy: self.endIndex) {
                return self.substring(from: to)

            } else {
                return ""
            }
        }
}

edited Apr 13 '17 at 09:36

answered Apr 13 '17 at 05:09

Neethu M

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6
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have you tried emojis? "‍‍‍".toLengthOf(length: 1) will be "‍" – Kubba Apr 13 '17 at 08:59
@Kubba This works for emojis as well. In your case, the output would be "". – Neethu M Apr 13 '17 at 09:06
after your edits - now it outputs: `"12".toLengthOf(length: 1) // 2`, `"‍‍‍".toLengthOf(length: 1) // "‍‍"` – Kubba Apr 13 '17 at 09:13
@Kubba I have added the screen shot of your scenario. Please have a look. – Neethu M Apr 13 '17 at 09:26
use emoji which is made from more than emoji. For example is made from one emoji. ‍‍‍ is made from four basic emojis. `"\u{200D}\u{200D}\u{200D}" == "‍‍‍" //true` – Kubba Apr 13 '17 at 09:30
because is a single emoji, ‍‍‍ is not, try with it. – Kubba Apr 13 '17 at 09:43
1

@Kubba This won't work for emojis made from more than one emojis because a normal emoji would contain only one character whereas the one you mentioned contains multiples characters. But I think it will work for the scenario asked in the question. – Neethu M Apr 13 '17 at 10:01
Getting a warning as 'substring(from:) is deprecated.' – Jayprakash Dubey Mar 08 '19 at 06:13

score 0 · Answer 4 · answered Sep 20 '17 at 12:16

0

It will remove first 6 characters from a string

    var str = "Hello-World"
    let range1 = str.characters.index(str.startIndex, offsetBy: 6)..<str.endIndex
    str = str[range1]
    print("the end time is : \(str)")

answered Sep 20 '17 at 12:16

srinivasg

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Remove the first six characters from a String (Swift)

4 Answers4