Dictionary extension for case insensitive value lookups

Dictionary+CaseInsensitive.swift

import Foundation

extension Dictionary where Key == String {
    
    func valueForInsensitive<T>(key: Key) -> T? {
        let key = keys.first { $0.compare(key, options: .caseInsensitive) == .orderedSame } ?? key
        return self[key] as? T
    }
}

// MARK: Example

var parameters: [String: Any] = [
    "ID": 12345678,
    "userName": "50Cent",
    "lengthOfLife": 50
]

let id: Int? = parameters.valueForInsensitive(key: "id")
let username: String? = parameters.valueForInsensitive(key: "username")
let age: Int? = parameters.valueForInsensitive(key: "lengthOfLife")