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Now in the previous video we discussed how we could create key value pairs in Y

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AML,

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now what I want to do is to talk to you about something known as a raise. So

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with that said,

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let's get to it. So once again if you go to one of the online tools to validate

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your YAML,

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what I'm going to do is attempt to write some YAML but there's going to be a

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bit of a problem.

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Let's see what happens. So I'll start off with my three hyphens for good

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practice.

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And let's maybe say I want to have a name key and the name can just be John Mc

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Govern.

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Then I happen to have my age, specify 38. And let's maybe say I want to specify
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Then I happen to have my age, specify 38. And let's maybe say I want to specify

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the foods that

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I like. So I say foods and then I maybe have the value pizza and I try to add

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in more foods, okay.

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Let's maybe say sushi but there is a bit of a problem. If I go and I click go

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here,

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here's us here that map keys must be unique and we actually have a problem at

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line five which is

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this part right here. This is where we have a duplication in the keys

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themselves. So this is

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a new discovery. Our keys in YAML must actually be unique at least at the same
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a new discovery. Our keys in YAML must actually be unique at least at the same

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level of indentation.

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So the question is what if we have multiple values we want to specify say for

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example we have

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multiple favorite foods or multiple servers that type of thing. We can't just

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keep duplicating

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the key itself. So how will we solve this particular problem? Well the answer

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is by creating something

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known as an array. Sometimes colloquially this might be referred to as a list

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object

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but the correct terminology with respect to YAML is indeed an array. Now what

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an array is going to

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do is going to allow us to specify multiple values. Now one thing to note is
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do is going to allow us to specify multiple values. Now one thing to note is

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that we can actually

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denote this in two different ways. We can use something known as the inline

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syntax. This is going

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to make use of square brackets and we can also use something known as the block

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format syntax.

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This is basically going to make use of hyphens. Now there is no right or wrong

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way in which to do

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this both types of syntax is absolutely valid but the more common one you're

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going to see is indeed

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the block format utilizing the hyphens. But I'll show you both just in case. So
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the block format utilizing the hyphens. But I'll show you both just in case. So

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let's maybe say we

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have a whole bunch of food that we want to represent. We could just have a food

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key and as opposed to

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having the value here as pizza we could try say for example the inline format

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in fact let me just

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zoom in a little bit here. So in fact let's first start with the block format

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because that is the

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most common. So indented within foods because it's going to belong to the foods

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I'm going to say

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one two for the spacing and then I'm going to have a hyphen and then after that

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hyphen I can

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specify the actual value that I want to add in here so I can say pizza if I hit
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specify the actual value that I want to add in here so I can say pizza if I hit

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enter and I do

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space space and hyphen again I can add in my second value which would be sushi

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and again I

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can add in another value let's maybe say carrots carrots are not my favorite

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food by the way I'm

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just adding in some new values and if I get down here and click go notice this

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is valid yaml and

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we can see here visually that these three values because of the indentation

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here they actually belong

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to the food key that in the food folder so to speak. Now like I say we can also

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do this using the

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inline formatting or the inline syntax let's just delete this and the way we do
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inline formatting or the inline syntax let's just delete this and the way we do

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this is by simply

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using square brackets so if we do square brackets here we can just specify all

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of the values that

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we want and we separate those values out utilizing commas so I could just say

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pizza and then a

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comma and then add in sushi and then a comma and then again I can add in

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carrots and I hit go right

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here automatically you'll notice that this particular program has accepted this

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is valid yaml but it

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did actually format it using the block format indentation nevertheless both
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did actually format it using the block format indentation nevertheless both

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ways are absolutely

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valid so in combination with these key values as well as these array objects

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you can really

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create some very complex and nested data so let's say I wanted to represent all

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of the users on my

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system now if I happen to have multiple users I would want to have my hyphen to

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denote multiple

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objects and I could give that user a name so let's say the name is samona and

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the next user can be

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lalo now maybe we want to add in the user ID for that particular user so let's
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lalo now maybe we want to add in the user ID for that particular user so let's

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maybe say

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a one thousand and one for samona and similar for lalo we can have one thousand

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and two so now let's

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say the next thing that we want to represent where all of the groups that these

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users happen to be a

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member of now this is going to comprise of multiple entries so what I could do

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is I could create a

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group's key right here and again and then to within I could have my hyphens so

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I can say samona is part

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of the samona primary group and let's imagine samona is part of the view group

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and let's say

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samona is also part of the engineering team similarly with lalo we can have
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samona is also part of the engineering team similarly with lalo we can have

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groups and in

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within lalo can be part of the lalo primary group and let's say lalo is not a

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member of the view group

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but lalo is a member of the design team notice that via the use of my hyphen

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ation I'm able to

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effectively duplicate say for example the name key here and the name key here

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because they're

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part of an array and similarly nested within those we can further use those

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array objects in this

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case here to signify multiple different values for the groups key so let's try
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case here to signify multiple different values for the groups key so let's try

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the validation

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We click go as we can see here this indeed is valid yamel.