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Else code end compares the expression specified by case and that specified by when using the operator and executes the code of the when clause that matches.

Ruby switch case or.

The components of a case statement in ruby. Ruby case statement syntax case expression when expression expression then code. If you are opening a file which does not exist then if you did not handle this situation properly then yo. The case statement is a multiway branch statement just like a switch statement in other languages.

Whenever you need to use some if elsif statements you could consider using a ruby case statement instead. If 表达式用于条件执行 值 false 和 nil 为假 其他值都为真 请注意 ruby 使用 elsif 不是使用 else if 和 elif 如果 conditional 为真 则执行 code 如果 conditional 不为真 则执行 else 子句中指定的 code. Switch statements function somewhat similarly to the if statement used in programming languages like c c c visual basic net java and exists in most high level imperative. Ruby exceptions the execution and the exception always go together.

In this post you will learn a few different use cases and how it all really works under the hood. In computer programming languages a switch statement is a type of selection control mechanism used to allow the value of a variable or expression to change the control flow of program execution via search and map. Ruby case statement last updated. The expression specified by the when clause is evaluated as the left operand.

In other programming languages this is known as a switch statement. Stack overflow for teams is a private secure spot for you and your coworkers to find and share information. 1 is a fixnum hello is a string 2 is a 1 3 in the range of 比较让人产生误解的 大概就是1 1也为true 所以理解起来 也不纯碎是is a关系.

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