A sample on getting a default value for Optional with nil cases using if let and guard let statement.

InefficientStringValueValidation.swift

func getValidString(string: String?) -> String {
	
	if let validString = string {
		return validString
	} else {
		return ""
	}
}

func anotherGetValidString(string: String?) -> String {
	
	guard let validString = string else {
		return ""
	}
	
	return validString
}