Ruby Case Statement Return Value

Case capacity when 0 you ran out of gas.

Ruby case statement return value.

The return statement in ruby is used to return one or more values. Let s see an example where we want to print some message depending on what range a value falls in. Usr bin ruby for i in 0 5 puts value of local variable is i end here we have defined the range 0 5. One equals sign in ruby means assignment make sure to use when you want to find out if two things are the same.

Here we have explained if expression ternary if unless expression modifier if and unless and case expression. If you don t this right you won t get the expected results. 1 value is set 3 value is set ruby case statement syntax case expression when expression expression then code. But when you want to check for the opposite not true false.

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. The statement for i in 0 5 will allow i to take values in the range from 0 to 5 including 5. For example def test i 100 j 10 k 0 end this method when called will return the last declared variable k. A case statement will always return a single object just like a method call.

Hash index value returns the key for the given value in hash nil if no matching value is found. This will produce the following result. Will insert the default value for keys that are not found. Nil and false are false values.

Every method in ruby returns a value by default. Hash has value value tests whether hash contains the given value. For example the above version of the case statement ca be re written like this. Hash indexes keys returns a new array consisting of values for the given key s.

This method is deprecated. Return values from methods. Things are no different when it comes to case statements. True and any other object are true values.

So you can safely wrap a case statement in a method call and ruby will have no problems with it. This can quickly become cumbersome however when a need arises to evaluate a large number of conditions. With an if statement you can check if something is true. This returned value will be the value of the last statement.

Ruby case ranges. All the expressions described here return a value. Notice that we use two equal symbols to mean equality. Result case value when match1 then result1 when match2 then result2 when match3 then result3 when match4 then result4.