![]() ![]() If you feel tempted to take an idiomatic feature of your favorite language and apply it in other languages, first ask yourself whether the feature had any merit even in the original language. ![]() This was reasonable when switch supported only a few reference types. Many people consider the "idiomatic" way of doing things in a particular language to be a goal in and of itself, while it is not. Traditionally, switch statements and expressions throw NullPointerException if the selector expression evaluates to null, so testing for null must be done outside of the switch. Many languages do not even have any particular reason of existence. The fact that golang allows the creation of meaningless switch statements means absolutely nothing to me. It provides an easy way to dispatch execution to different parts of code based on the value of the expression. It is like an if-else-if ladder statement. In simple words, the Java switch statement executes one statement from multiple conditions. So, the nicer way of doing this is to go back to the good old, familiar, tried-and-true, cascaded if-else statement. The switch statement is a multi-way branch statement. If I study the code and I notice that my expectation is not met, I will be mighty surprised. When I see a switch statement, I expect to see various different things done based on different values of a particular variable I do not expect to see just about anything being done in there. No such thing happens when there is no switch expression. Modern switch statements work on more complex values, but when there is a single controlling switch expression there is still some possibility of optimization. The original implementations of switch statements used highly efficient lookup tables, that's why they could only operate on int. If there is no switch expression, then it is not a switch, it is a collection of mutually exclusive rules.Īnother idea behind the invention of the switch statement was the possibility of optimization. The very concept of a "switch" is based on the idea of more than one outcome which is controlled by something in the case of the switch statement, that something is the switch expression. The when extension was invented to add some flexibility and terseness to this mechanism, but the original purpose of the mechanism is still there: to switch on possible values of a particular variable. The switch statement is used for executing different code paths based on possible values of a particular variable. List all C# tutorials.There a few principles that I can think of that can guide decisions for situations like this: Soįar, I have written over 1400 articles and 8 e-books. I have been writing programming articles since 2007. My name is Jan Bodnar and I am a passionate programmer with many years of In this article, we have presented C# switch expression. In the switch expression to reach the game conclusion. string RockPaperScissors(string human, string computer) => (human, computer) switchįrom the human and computer choices we form tuples which are used as patterns We have a Rock paper scissors game in which we utilize the tuple expression. ("scissors", "paper") => "Scissors cut paper. ![]() ("scissors", "rock") => "Scissors are broken by rock. ("paper", "scissors") => "Paper is cut by scissors. ("rock", "scissors") => "Rock breaks scissors. ("rock", "paper") => "Rock is covered by paper. String RockPaperScissors(string human, string computer) => (human, computer) switch Var res = RockPaperScissors(human, computer) Var menu = "Select: \n1 -> rock\n2 -> paper\n3 -> scissors\n4 -> finish" ![]()
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