Ruby Switch Case Example

Are executed until break is encountered.

Ruby switch case example.

It is similar to the switch keyword in another programming. Let s see an example where we want to print some message depending on what range a value falls in. Case capacity when 0 you ran out of gas when 1 20 the tank is almost empty. Basically if elsif else notice there s nothing after the word case.

The expression specified by the when clause is evaluated as the left operand. The following case example detects where a number falls amongst a group of different ranges. Otherwise the switch case will trigger the default case and print the appropriate text regarding the program outline. Ruby uses case and when where others use switch and case.

This example shows that case statements not only match an item s value but also its class this is possible because under the hood ruby uses the operator aka. The case statement is a multiway branch statement just like a switch statement in other languages. Variable case when bool condition statements when bool condition statements else the else clause is optional statements end if you assigned variable before the case the variable now has the value of the last executed statement or nil if there was no match. Quickly find a gas station when 21 70 you should be ok for now.

Ruby case ranges. 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. Why do we need a switch case. Score 70 result case score when 0 40 then fail when 41 60 then pass when 61 70 then pass with merit when 71 100 then pass with distinction else invalid score end puts result.

There is one potential problem with the if else statement which is the complexity of the program increases whenever the number of alternative path increases. The case statement is more flexible than it might appear at first sight. A quick tour of the operator. The three equals operator.

When you write x y y in ruby you re asking does y belong in the group represented by x this is a very general statement. For example if the value of the expression is equal to constant2 statements after case constant2. Ranges strings and regexp use the case statement. The expression is evaluated once and compared with the values of each case label.

Ruby case statement syntax case expression when expression expression then code. Match values and ranges of values with this statement. How does the switch statement work.