Ruby Switch Case Or

Whenever you need to use some if elsif statements you could consider using a ruby case statement instead.

Ruby switch case or.

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. Ruby case statement syntax case expression when expression expression then code. The components of a case statement in ruby.

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. Ruby exceptions the execution and the exception always go together. In most computer languages the case or conditional also known as switch statement compares the value of a variable with that of several constants or literals and executes the first path with a matching case in ruby it s a bit more flexible and powerful. The expression specified by the when clause is evaluated as the left operand.

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. Stack overflow for teams is a private secure spot for you and your coworkers to find and share information. In other programming languages this is known as a switch statement. Ruby case statement last updated.

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. 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. It provides an easy way to forward execution to different parts of code based on the value of the expression.