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Unless is another type of control structure.
The general syntax is:
unless condition
instruction1
else
instruction2
end
The same rule applies, you can have as many instructions executed as you want, I just avoided writing more.
The output:
The program verifies if the condition is true and if it is, it executes instruction1.If the conditions is false, it executes instruction2
If you need something even more powerful in terms of options, you can use the case statement, similar to "switch" in other programming languages.
The general syntax of the case statement:
case variable
when condition1
intruction1
when condition2
instruction2
...............
when conditionk
instructionk
else instructionk+1
end
The outcome:
The program evaluates the value of the "variable".If the value equals condition1, then instruction1 is executed and so on.
If none of the condition1 to conditionk are equal to the variable value, then the program will execute instructionk+1
You can also evaluate something with the ternary operator "?" like this:
x = condition ? iftrue : iffalse
The outcome:
x will be assigned the value of "iftrue" if the "condition" is true, and the value of "iffalse" if the condition is false.
An example:
x = y != 5 ? y : 0
If y is different than 5, then x takes the value of y.If y equals 5, x becomes 0.
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