Ruby Programming Tutorial - 29 - each and length Video Lecture | Introduction to Coding with Ruby - Back-End Programming

what is up my friends welcome to your
29th Ruby tutorial and the first thing I
wanted to do in this tutorial is teach
you guys about the each method now the
purpose of the each method is basically
to loop through an array and every time
you get across an element you can do
something with it you can either add a
number to it you can print it out on the
screen you can do whatever you want with
it so the first thing we need is
obviously inter eight now go ahead and
name your array Sally or else this
example isn't going to work and let's go
ahead and put a couple numbers in there
10 20 30 40 and 50 sounds good go ahead
and hit enter and now check it out there
are five different numbers in Sally so
now let's go ahead and loop through this
array element by element so in order to
do that go ahead and type the name of
your array which is Sally and now write
the name each now this is saying okay we
want to loop through this array one
element at a time so now what we need to
do and you guys have probably seen this
before extract each element and store it
in variable called X so the very first
time you run through this X is going to
be equal to 10 then 20 then 30 40 50
it's basically going to loop through
this five times and X is going to be
equal to a different value in the array
each time so now that we have X what do
we want to do with it let's just go
ahead and do something incredibly stupid
like print it out on the screen so now
go ahead and hit enter and check it out
it prints out 10 20 30 40 50 so again
the syntax one more time type the name
of your array then type each this uses
the each method basically looping
through your array now for each of those
elements we want to store it in variable
called X and then do whatever you want
with those elements print them out on
the screen or do something else now
another key thing that you can do is and
this isn't really have anything to do
with the last one but it's a common
method whenever we're talking about
arrays it's that find out how many items
or elements are in your array now you do
this by using something called the
length method or the length property so
let's just go ahead and print out the
value on the screen
puts cheese or away that was from the
last story wasn't yeah we're working on
Sally now sorry my memories fading I'm
an old man now
okay so go ahead and write the name of
your rate and then write length now what
this does is it basically counts how
many elements are in your array and it
prints it out on the screen so go ahead
and hit enter and we get five why is
this because check it out one two three
four five now the one thing I want to
mention about this is it's different
from just getting the value of the last
index because remember if we were
counting these the way our computer
counts them through the index 0 1 2 3 4
it would give us 4 but what this does is
it counts how many elements total are in
your array 1 2 3 4 5 pretty cool huh
so actually I have to talk to you guys
about one last thing but I think I'm
going to save that for the next tutorial
and then we're going to be done with
arrays so I know this was a short
tutorial but in the next lesson we got a
bunch of new info coming so anyways
thank you guys for watching don't forget
subscribe and I'll see you guys in the
next video