Perl Tutorial - 9: Replacing Array Elements Video Lecture | Perl Building Blocks: An Introduction to Perl - Back-End Programming

hello guys welcome to my channel this is
the ninth tutorial in this course and in
this tutorial we're gonna see how we can
perform the replace operation on arrays
in Perl so we're gonna work with a
script called array underscore replace
and in the script file as you can see on
line number five I have created an array
variable called actors and it has the
values Tom Hanks Brad Pitt Will Smith
and Edward Norton now let's say from
this list of actors you want to remove
some names and you want to insert other
names that are present in another array
variable and I've got that variable
ready as well on line number six as you
can see I have created a variable called
new and this array has two elements in
order to Caprio and Denzel Washington so
the way you replace elements in Perl
from an array is by using the splice
function or the splice subroutine so
before we come to that on line number
eight I've got a print statement that
displays the elements in the actors
variable before the replace operation
has been performed and on line number
ten I have the splice subroutine call
and in in Perl functions are also called
subroutines so you know if you hear me
saying subroutines just don't freak out
it's nothing but another name for a
built-in function and you could create
subroutines of your own and we're gonna
discuss that when we get to the tutorial
on subroutines but for the time being
this subroutine or this function is
fairly easy to use it has a very simple
syntax it accepts four arguments the
first one is the name of the array from
which you want elements to be removed
the second argument is the offset
position or the index from where you
want the elements to be removed so if
you want you know Tom Hanks to be
removed then you would have to put zero
here because that would mean that you
want the replaced operation to be
performed from the first element the
very first element in your
variable but let's say we wanted to move
Brad Pitt and Will Smith and instead of
these two names we want to insert
Leonardo DiCaprio and Denzel Washington
so the second argument I hope we're
clear now is the offset the third
argument is the number of elements that
you want to replace so in our case it
would be two because we want to replace
these two guys with these two guys
so the third argument is two and the
final argument is an array variable that
contains the items that are supposed to
replace the items in the original
variable so we have those names in the
array variable new so we're going to
pass that as a fourth argument and then
once this has completed you know it's
job we are going to print the actors
array variable once again just to make
sure whether all of this work correctly
or not
so the script is saved I just have to
press f5 to execute it and there we go
we see the output now Tom Hanks Brad
Pitt Will Smith and Edward Norton this
was the original array actors and then
after the replace operation has been
performed we have Tom Hanks Leonardo
DiCaprio Denzel Washington and Edward
Norton so Brad Pitt and Will Smith have
been replaced with Leonardo DiCaprio and
Denzel Washington respectively so that's
it for this with oil I hope you guys had
fun watching this one you may subscribe
to my channel if you haven't already I'm
gonna see you in the next video till
then take care