Conditionals are used to add branching logic to your programs; they allow you to include complex behaviour that only occurs under specific conditions.
Here is the syntax of an
if condition something to be done end
condition is an expression that can be checked for truth. If the expression evaluates to
true, then the code within the block is executed.
Here are some examples of expressions that evaluate to
3 < 4 true "cat" == "cat"
You can combine
if with the keyword
else. This lets you execute one block of code if the condition is
true, and a different block if it is
if condition something to be done else something to be done if the condition evaluates to false end
else block will only be executed if the
if block doesn't run, so they will never both be executed.
When you want more than two options, you can use
elsif. This allows you to add more conditions to be checked.
Here is if/elsif/else statement syntax:
if condition something to be done elsif different condition something else to be done else another different thing to be done end
Still only one of the code blocks will be run, because the statement only executes the code in the first applicable block; Once a condition has been satisfied, the whole statement ends.
Below is an actual example of an
if statement with both an
elsif and an
booleanOne = true randomCode = "Hi!" if booleanOne puts "I will be printed!" elsif randomCode.length>=1 puts "Even though the above code is true, I won't be executed because the earlier if statement was true!" else puts "I won't be printed because the if statement was executed!" end
Change the value of language so that the elsif statement is the only block being executed.