Question

How to remove characters present in first string from the second string in Swift

Answer 1

import Foundation

/// Removes all characters from `source`
/// that appear in `charsToRemove`.
func removeCharacters(
    from source: String,
    charsToRemove: String
) -> String {
    let forbidden = Set(charsToRemove)
    return String(source.filter { !forbidden.contains($0) })
}

let first = "programming language"
let second = "rogy"

let result = removeCharacters(
    from: second,
    charsToRemove: first
)

print("First : \"\(first)\"")
print("Second: \"\(second)\"")
print("Result: \"\(result)\"")



/*
run:

First : "programming language"
Second: "rogy"
Result: "y"

*/

 

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Answer 2

import Foundation

/// Removes all characters from `source`
/// that appear in `charsToRemove`.
func removeCharacters(
    from source: String,
    charsToRemove: String
) -> String {
    let forbidden = Set(charsToRemove)
    var result = String()

    for character in source {
        if !forbidden.contains(character) {
            result.append(character)
        }
    }

    return result
}

let first = "programming language"
let second = "rogy"

let result = removeCharacters(
    from: second,
    charsToRemove: first
)

print("First : \"\(first)\"")
print("Second: \"\(second)\"")
print("Result: \"\(result)\"")



/*
run:

First : "programming language"
Second: "rogy"
Result: "y"

*/

 

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