Ruby Case Switch

Ruby case statement syntax case expression when expression expression then code.

Ruby case switch. 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. Number ranges and the case statement. Whenever you need to use some if elsif statements you could consider using a ruby case statement instead. The expression specified by the when clause is evaluated as the left operand.

Ruby uses case and when where others use switch and case. The case statement is a multiway branch statement just like a switch statement in other languages. In this post you will learn a few different use cases and how it all really works under the hood. The following case example detects where a number falls amongst a group of different ranges.

It provides an easy way to forward execution to different parts of code based on the value of the expression. Ruby case statement last updated. 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 case statement is also particularly useful when used in conjunction with number ranges for details of ranges read the ruby ranges chapter of this book.

Basically if elsif else notice there s nothing after the word case. The components of a case statement in ruby. 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. Variable case when bool condition statements when bool condition statements else the else clause is optional statements end if you assigned variable before.