Hello everyone, welcome back to my

YouTube channel. So in this video we are

going to discuss how we can use if else

conditions along with or and not

functions inside our Halum templates. So

let's understand with the help of

example.

So under template section I have a file

called deployment.mml.

So if you see uh under replica sections

so basically what we are going to uh see

in the demonstrations. So based on the

environments we are going to select

number of replicas. So for example if it

is a dev environment or test environment

then replicas count will be two. If it

is a prod environment then the replica

count should be five. And if it is not a

dev test or prod environment something

else maybe test one dev one dev 2

whatever it is then it is going to

select number of replicas one. Okay. So

now let's understand each line one by

one.

Okay. So if you can see this is the one

argument here we have and this is the

another another argument we have and

here we are going to use or operators.

Sorry not operator or functions. So what

does it mean? If the environment value

is dev or test then it is going to run

this particular block or this number of

replicas it is going to select. Okay. So

let's verify this first. So for that

again I'm going to use helum template

command because I want to run the or

maybe I want to render this templates

locally. So let's run hello

template and let's give name ab

dot.

So you can see it is selected number of

replicas too. Why? Because in values dot

environments

values sorry in values doml file we have

environment value is tab. So if I'll go

to my values doml file here we have a

environment value is tab. That's why it

is executed this particular condition

because it is satisfied. We have not

specified test. Let's verify for test

because test environment value we have

not specified in our uh values.mml file.

So let's see what it select. So let me

clear the screen

here. I will use hyphen - set

and here let's see test.

Okay, so spelling mistake here.

Okay.

Okay. So here you can see again it is

selected number of replicas two because

we have passed the flag hyphen set value

involvement equal to true sorry equal to

test that's why again this particular

condition is satisfied and it is

selected number of replicas two so if I

go here we have a number of replicas two

now if the involvement value is not dev

not tested and if involvement value is

pro then it is going to execute this

particular block that's why here we have

used else if conditions else if equal to

dot values dot environment equal to plot

so now let's try this one

so here I will change the value to trot

so now it is you can see the number of

replicas five because it is not

satisfied this particular conditions

that's why it is going through this

particular block because here it is

easily able able to find the environment

value is brought which is we have passed

as a hyphen - set flag that's why it is

going to this particular block.

Okay. Now let's move to another line

which is little confusing and important

as well. So if uh let's understand first

this argu this value. So in or operator

or or functions one of the argument

values should be true. Either this can

be true or this can be false or or maybe

vice versa. This can be false and this

can be true. So at least one of the

argument values should be true then it

is going to execute all functions. And

if you're going to use not operator

sorry not function basically in that

case here you can see we have three

arguments one argument two argument and

three argument. So in this case here

basically all the argument value should

be true. So if sorry uh so here I have

specified when none of them are true.

Okay. So basically not functions only

work when this value is false this value

is false. This value is false because

not function basically flip the result.

What does it mean? Uh suppose

not value

not equal to. If the if the result the

combination of these all three argument

result is true then not basically flip

this result to false.

This is the function or use case of not

function. It basically flip your result.

So to work this particular block all of

the values should be false.

Then it is going to basically run or it

is going to select number of replicas

one. If all of these values are true

then it is not going inside this block

because if you can see it is going to

satisfy one of this particular

conditions which we have specified here.

So in not functions all of the argument

values should be false then it will flip

the result false to true and it will

execute this particular block. This is

the important point which you have to

keep in mind. Okay. Now let's verify

this.

So now what I will do I will se mention

here involvement value equal to prod one

because we don't have prod one anywhere

here. So what it will do? Let me run

this.

It is selected number of replicas one

because first it is check this

conditions which is false. Then this

argument again it is false and this

argument which is again it's false and

then it basically the not functions flip

the result to false to true and it uh

satisfy this this particular condition

block and it will select this number of

replicas. If we will select any one of

the environment here like prod only then

it is not going to under this particular

condition because it is already satisfy

this particular conditions because here

we have a environment value is pro. So

it will select number of replicas five.

So here we can see number of replicas

five. So these uh conditions and boolean

logics are very important when you are

going to create a generic template. So I

have already uh discussed about if files

with EQ and and end functions as well in

previous videos. If you want you can go

and watch those videos as well. I will

mention this code repository link in

GitHub in a YouTube video uh description

box. So if you want to do hands-on you

can do that. So that's all for today.

See you next video. Thank you so much.