Swift switch statement for matching substrings of a String

Question

Im trying to ask for some values from a variable. The variable is going to have the description of the weather and i want to ask for specific words in order to show differen

Answer 1

If you do this a lot, you can implement a custom ~= operator that defines sub-string matching:

import Foundation

public struct SubstringMatchSource {
    private let wrapped: String

    public init(wrapping wrapped: String) {
        self.wrapped = wrapped
    }

    public func contains(_ substring: String) -> Bool {
        return self.wrapped.contains(substring)
    }

    public static func ~= (substring: String, source: SubstringMatchSource) -> Bool {
        return source.contains(substring)
    }
}

extension String {
    var substrings: SubstringMatchSource {
        return SubstringMatchSource(wrapping: self)
    }
}

switch "abcdefghi".substrings {
    case "def": // calls `"def" ~= "abcdefghi".substrings`
        print("Found substring: def") 
    case "some other potential substring":
        print("Found \"some other potential substring\"")
    default: print("No substring matches found")
}