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So we saw embedded documents,

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let's now have a look at arrays of data and for that, let's go back to our passengers.

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So remember we got our passengers collection, if we find all entries there,

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this is how a passenger looked like.

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Now let's say we also record the hobbies of our passengers, 

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for this I'll edit Albert Twostone here

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with updateOne,

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so by selecting the passenger with the name Albert Twostone, like this and I'll update it by setting

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a new field

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00:00:40,340 --> 00:00:45,780
there, hobbies which is an array marked with square brackets, so this is important,

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now it's an array.

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And here we can have any kinds of data there,

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we could have multiple documents in here, that would be fine but we can all have multiple numbers or

14
00:00:55,810 --> 00:00:59,970
simply strings like sports and cooking,

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these are just strings not documents.

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So any kind of data you can have in a document can also be in an array in a document.

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If I hit enter and I output my passengers, you see Albert now has hobbies,

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he's the only passenger with that because we filtered for him and hobbies now a list of data.

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It's not a nested or embedded document,

20
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it's a list of strings in this case

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and as I said, this could be numbers, this could also be other documents, so you can also have documents

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in an array and you can have arrays in documents,

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this is possible.

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You can even have arrays in nested documents,

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this is all possible.