#4.1 Kotlin Tutorial for Beginners REPL Read Eval Print Loop Video Lecture

hi registering Siddarth once again
welcome to the fresh module of this
course of Cortland programming series
now in the previous module we actually
kick-started our Cortland programming
right now from this module onwards we
will again start fresh and practice once
again how to create a new project now in
this video we will learn about what is
repl ripple that stands for read eval
print loop so here again I will simply
start my IntelliJ IDE and right now I am
using Mac OS if you are on Windows then
also you can follow along with me so
here this is the project that we created
in the previous modules so here I will
simply delete it and I will simply start
fresh by simply creating a new project
and here simply select Courtland
Courtland JVM and then hit on next and
now let us define the project name let's
say Cortland programming again and then
simply define the project location and
down the side simply select the project
SDK which is actually the Java JDK in
our case now if you are watching this
video for the first time then let me
tell you how to set the path to the
project SDK that is the java jdk now if
you are on Mac and if it is not selected
then simply select this new and then
navigate to library then Java then Java
Virtual Machine and then here you will
find the java jdk inside which contents
and then simply select whom and then hit
on open now if you are using Windows
then you will find the java jdk inside c
drive within which you will have Program
Files within which you will have Java
folder inside that you will get the java
jdk so simply select that java jdk
folder and hit on OK and now let us
click on finish and here we have simply
created our first project now make sure
you're working under the project view
and now simply select the coeur d'alene
programming inside which you will have
the SU
folder now simply right-click on it and
now let us create our first Kotlin file
now all these steps we have already
followed in the previous video I am
simply repeating it so as to make you
familiar with how to get started with
Cortland programming again because more
you practice then more you remember so
here let me define my file name as let
us call it my first and then simply
select file hit on OK and now here I
will simply define my main method if
function main Arg is : then array of
string this is the syntax that we follow
in case of Kotlin right now inside this
we will write our code from the next
video now in this video let us now check
out what is ripple that is repl read
eval print loop so here at the top you
will find tools inside which you will
have Kotlin within which you will find
cortland ripple so simply selected and
this will simply open a window at the
bottom now the purpose of using ripple
is that inside the ripple you can run
your Kotlin code as quickly as possible
let's say let us type 1 plus 2 and let's
see what happens now to execute the code
inside the ripple you need to simply
press command + Enter in case of Max and
in case of Windows you have to type ctrl
+ Enter so since I'm using max so I will
simply use command + Enter and now here
I get 3 as the output so inside the
ripple you can simply execute your codes
as quickly as possible let's try
something different
10 - let's say 7 command + Enter we get
3 right now let's try something
different
10 divided by 7 ctrl + Enter we get 1 as
the output since we are using 10 and 7
as integer value now let us use 10 point
0 / 7 ctrl + Enter and here we get that
similar value that is the exact value
that we will get by dividing 10.0
divided by seven right the
floating-point value we are getting here
now let us try something different print
and then let us type hello and now ctrl
+ Enter and here we get hello in the
output console right so the purpose of
using ripple is that you can test your
code as quickly as possible so whatever
code that we will write inside the main
function if you want to test it without
running the whole application you can
simply copy and paste it here and simply
press ctrl + enter in the ripple right
so as to test your output and now here
you can simply type where space str
equal to let's say hello hit enter now
remember i have simply pressed enter not
ctrl + Enter so in the next line I can
simply perform some operation on this
STR variable let's say STR + and now hit
enter and now I will simply print the
value of STR so in this way you can
simply type multiple lines in case of
ripple and now simply press ctrl + Enter
and here we get the output as hello
world combined right so in this way you
can simply type multiple lines in case
of ripple as well so this was all about
this video and at last I would say
ripple stands for read eval print loop
so always remember this so see you guys
in the next video thank you