Using 'guard' statement for early exits in swift?

Example:

  func validate(number: Int?) -> Bool {
      if let _ = number {
          return true
      }
      return false
  }
  print(validate(number: nil))
  

The example defines a function that checks if an optional number is nil or not using an 'if let' construct.

Solution:

  func validateUsingGuard(number: Int?) -> Bool {
      guard let _ = number else {
          return false
      }
      return true
  }
  print(validateUsingGuard(number: nil))
  

In the solution, the 'guard' statement provides a clearer and more concise way to perform the validation.