Ruby Case Switch

Ruby 入門 条件分岐.

Ruby case switch.

The following case example detects where a number falls amongst a group of different ranges. 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. It provides an easy way to forward execution to different parts of code based on the value of the expression.

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. 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. 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 case statement syntax case expression when expression expression then code. Ruby case statement last updated. Number ranges and the case statement. In other programming languages this is known as a switch statement.

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 components of a case statement in ruby. Score 70 result case score when 0 40 then fail when 41 60 then pass when 61 70 then pass.