Perl Tutorial - 32: Last Statement Video Lecture | Perl Building Blocks: An Introduction to Perl - Back-End Programming

hello guys welcome to my channel this is
the thirty-second to told in this course
and in this tutorial we'll be talking
about the last statement in Perl so the
last statement is by the by the last
trade when I don't mean the last
statement I mean the statement last
enfold and this statement is equivalent
to the break statement in most
programming languages you know just as
the next statement was equivalent to the
continue statement the last in Perl
means break in C++ or Java or you know
PHP or you know so many other
programming languages so anyway I'm
going to use a very similar example to
what we saw in the last tutorial I have
a script here that's called last and in
the script on line number three I have a
for loop which has X as a control
variable and I have initialized X within
the for statement and it has initial
value of pen the test condition is X is
less than or equal to 20 and we are
incrementing the value of x by 1 and
over here since I have less than equal
to instead of just less than the loop is
expected to have 11 iterations but let's
say we want this loop to run only till a
certain point and you know of course you
could argue that you know why program it
within the loop you know we could just
change the test condition so if suppose
you want this loop to only work till X
has the value 15 then you could you know
play with the test condition here X is
less than equal to 15 instead of you
know 20 but let's say you have a
situation in which you want the user to
be able to decide how many iterations
are you the you know the loop should
have and the maximum value that X can
take is 20 so you're providing the scope
for the loop through the for statement
and then within the body of the loop you
can have an if statement but this time
you know even though the test condition
is going to be the same X is equal to
equal to 15 instead of using the next
statement we are going to use the
statement last so you just type last and
put a semicolon and what this would do
is as soon as the program you know the
control reaches this statement you know
the loop is not going to have any more
iteration so unlike next in which we
simply move to the update part and you
know proceeded with the next iteration
in case of last we are not going to have
any more I trace in the loop and you
know just going to pass the control to
this line you know line number 10 if
there was anything after this curly
brace and that would have executed as
soon as we went you know these last so
again I'll explain the flow X initially
has a value 10 the test condition is
okay we're going to get inside the if
statement is going to fail we're going
to print the value of X update X 11 you
know move ahead and do the same thing
and as soon as X is going to get the
value 15 this test condition is going to
value to true if it's going to work
we're going to get inside the if block
execute last and that'll be the end of
story for the loop so let me make sure
that this file is saved I'll press f5 to
run it and there we go we see 10 11 12
13 and 14 but we don't see 15 because we
have this part inside the body of the
loop so that's it for this tutorial
I hope you guys had fun watching this
one you may subscribe to my channel if
you haven't already I'm going to see you
in the next video till then take care