How to remove characters from a String in swift

Question

I am looking for a simple way to remove the 4 characters in the tilesColored String "ment" from the shuffledWord1.

var word1: String = "employment"
var shuffledWord1: String = "melpyoemtn"

var tilesColored: String = "ment"
var characters = Array(tilesColored) // gives ["m","e","n","t"]

let newWord1 = word1.StringByReplacingOccurencesOfString("\(characters[0])", withString:"") // gives "elpyoetn"

stringByReplacingOccurencesOfString only allows 1 character to be checked and removes BOTH m's, so how can I check against all 4 and only remove ONE instance of each to return "melpyo"?

Thanks in advance for any help possible

Answer 1

Swift 3+ version with better performance than the previous top answers. (Because we don't separate into arrays with substrings, which all would need seperate allocations.)

This here just works on the unicode scalar level. You can paste it right into a playground.

import Foundation

extension String {

    func removeCharacters(from forbiddenChars: CharacterSet) -> String {
        let passed = self.unicodeScalars.filter { !forbiddenChars.contains($0) }
        return String(String.UnicodeScalarView(passed))
    }

    func removeCharacters(from: String) -> String {
        return removeCharacters(from: CharacterSet(charactersIn: from))
    }
}

let str = "n1o d2i3g4i5t6s!!!789"

let t1 = str.removeCharacters(from: CharacterSet.decimalDigits.inverted)
print(t1) // will print: 123456789

let t2 = str.removeCharacters(from: "0123456789")
print(t2) // will print: no digits!!!