SoompiBlog - Cache.swift

import Foundation

class Cache<T> {
  private var dict: [String: T] = [:]

  var didSetHandler: ((_ key: String, _ value: T) -> Void)?

  func clear() {
    dict.removeAll()
  }

  func set(_ value: T, for key: String, skipDidSetHandler: Bool = false) {
    dict[key] = value
    if !skipDidSetHandler {
      didSetHandler?(key, value)
    }
  }

  // returns an optional because key can be non-existent
  func value(for key: String) -> T? {
    return dict[key]
  }
}