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Now that was the exists

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operator, what is type all about?

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Let's go back to our users and find them all

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and of course I did not by accident add phone numbers which for two users are strings

5
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and for Max, it's a number.

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Now that gives us an opportunity to work with the type operator,

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so let's, whoops, on the users collection,

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let's find all users where the type of the phone number is a number let's say and for that, I'll look

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for that phone number and then I can use type and then specify the type it should be.

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Now the types available can be seen in the official docs,

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if you check out the type here, you will find the available types and these are the types I also touched

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on in my document schema module,

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so here you see we got string, we get doubles which are floating point numbers but we also got like the

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big integer, decimal 128 which I'll also come back to in the numbers module in this course, the numeric data

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module I should say.

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So these are two different types of data

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you could have and you can check for, also things like object or array or object ID,

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so these are the types you can check for.

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Now here it's pretty simple,

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I want to find all phone numbers, all documents with phone numbers where the phone number is a number. Now number

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is an alias that basically sums up floats and integers,

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so this does work,

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if I would look for a double, it would also work though even though I have no decimal places here by

24
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default since the shell is based on Javascript, a number I insert into my database will be stored as

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a floating point number, as a double

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because javascript again which drives the shell doesn't know integers and doubles, it only knows doubles

27
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so it takes that and stores it as a double

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even if we have no decimal places, this is why I can find this for double too.

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You can also use type a bit differently

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and you can specify multiple types,

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that would be ok,

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you then simply pass an array to type

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and here you can say it's ok if it's a double or let's say if it's a string and therefore now, I find

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all documents because they all either have a double,

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so a number or a string,

36
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you can of course also filter for just strings.

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So this is the type

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operator and how you can use it to make sure you only work with the right type of data when returning

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some documents.