The three equals operator.
Ruby switch case example.
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.
Ruby case statement syntax case expression when expression expression then code.
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.
Ranges strings and regexp use the case statement.
It provides an easy way to forward execution to different parts of code based on the value of the expression.
Otherwise the switch case will trigger the default case and print the appropriate text regarding the program outline.
Let s see an example where we want to print some message depending on what range a value falls in.
Match values and ranges of values with this statement.
The expression specified by the when clause is evaluated as the left operand.
Ruby case ranges.
It is similar to the switch keyword in another programming.
There are 3 important keywords which are used in the case statement.
The case statement is more flexible than it might appear at first sight.
Are executed until break is encountered.
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.
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.
How does the switch statement work.
If there is a match the corresponding statements after the matching label are executed.
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.
Why do we need a switch case.
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 case statement is a multiway branch statement just like a switch statement in other languages.
A quick tour of the operator.
For example if the value of the expression is equal to constant2 statements after case constant2.
The following case example detects where a number falls amongst a group of different ranges.
Case capacity when 0 you ran out of gas when 1 20 the tank is almost empty.
