in the previous part, you learned how to use labels for creating Conditions and Loops. but there is a easy way to create Conditions, that is If..elif..else statement. this system is very easy for creating conditions and handling program flow.
example:
if 2 == 2
println('yes, 2 is 2')
endif
or:
if 3 == 7
println('3 is 7')
else
println('3 is NOT 7')
endif
in this part, we learn how to use this system.
The if syntax is this:
if <condition>
# code
endif
for example:
$age = 30
if $age > 18
println('Welcome!')
endif
output:
Welcome!
$age = 12
if $age > 18
println('Welcome!')
endif
# above code haven't output
also you can use else:
$age = 12
if $age > 18
println('Welcome!')
else
println('you cannot access')
endif
if condition of if is not true, else block will be ran.
also there is other keyword elif:
$num = 17
if $num == 5
println('num is 5')
elif $num == 6
println('num is 6')
elif $num == 17
println('num is 17')
else
println('nothing')
endif
output:
num is 17
actually, elif block will be checked one by one. elif means else if.
you can write ifs in ifs.
look at this example:
$num = 15
$test = True
if $num == 18
pass
elif $num == 15
println('num is 15')
# another if in the parent if
if $test
println('this is a test')
else
println('this is not test')
endif
endif
output:
num is 15
this is a test