CODEWITHSUNDEEP
swift
WishIHadThreeGuns
WishIHadThreeGuns

Reputation: 1469

Swift String contain , or . but not both

I want to write the following in a more elegant way:

let number = "1,2922.3"

if number.contains(",") || number.contains(".") && !(number.contains(".") && number.contains(",")) {
    // proceed
}

That is, I want to proceed if the number has "." or ",", but not them both.

There has to be a better way?

I don't want to use an extension, as this is in a single place in my code.

Upvotes: 1

Views: 194

Answers (1)

AnderCover
AnderCover

Reputation: 2661

You can use SetAlgebra:

func validate(_ string: String) -> Bool {
    let allowed = Set(",.")
    return !allowed.isDisjoint(with: string) && !allowed.isSubset(of: string)
}

validate("1,2922.3") // false
validate("1,29223") // true
validate("12922.3") // true
validate("129223") // false

To explain a bit:

  • !allowed.isDisjoint(with: string) because you want to exclude strings that contain neither . nor ,.
  • !allowed.isSubset(of: string) because you want to exclude strings that contain both . and ,.

Upvotes: 5

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