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- Now, hopefully, this
code looks rather familiar

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since we've talked about this before.

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And the whole idea here is
how you create an object,

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which has dynamic keys
that have a specific value.

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For example, if you wanna
group people by their name,

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you would have a key for each name,

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which in our case is a string.

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And then you're going to have
the actual person array itself

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as the value.

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This is very common, and you
may see this code all the time

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but there's actually multiple ways

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you can create this exact same signature.

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What we could do

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if we wanted to create
the same exact thing,

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I'm just gonna copy this
down so we can compare

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and contrast them is I can
use the built-in record type.

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So this record type
takes two generic types.

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The first one is the type for your key,

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which in our case is a string.

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So whatever you have set here,
that's what that type is.

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And the second one is going

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to take whatever your actual value is.

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In our case, it is a person array.

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Now, this has the exact same signature.

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You can even see that it breaks
down to the exact same code.

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This record type is
essentially just an alias

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for doing this exact same thing.

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And personally, I find the
record type a little bit easier

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to read than this index type up here.

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So I generally lean more
towards the record type

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when I'm creating different
signatures like this.

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I like how it looks

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and it's a really good way to
create an object like this.

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And what could I even do

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if I wanted to be a
little bit more specific,

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I could say this is the
person name property

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'cause if I changed my name
to a number or something,

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this would still work just fine.

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So this is a really great
way to create objects

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instead of using this index type.

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Both of them do the exact same thing

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so it doesn't matter which one you use.

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I mean, you can see,

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they boil down to the exact
same code in TypeScript.

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It's entirely a personal preference.

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I just prefer this one

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'cause I find it a little easier to read.