Number of occurrences of substring in string in Swift

Question

My main string is \"hello Swift Swift and Swift\" and substring is Swift. I need to get the number of times the substring \"Swift\" occurs in the mentioned string.

T

Answer 1

My solution, maybe it will be better to use String.Index instead of Int range but I think in such way it is a bit easier to read.

extension String {
    func count(of char: Character, range: (Int, Int)? = nil) -> Int {
        let range = range ?? (0, self.count)

        return self.enumerated().reduce(0) {
            guard ($1.0 >= range.0) && ($1.0 < range.1) else { return $0 }
            return ($1.1 == char) ? $0 + 1 : $0
        }
    }
}