Can you explain the return value of array.find() in Typescript or Java script?

In my Typescript code, I have the following line:

const addressFound: AddressPrimary = <AddressPrimary>(this.addressArray.find(addr => addr.id === id));

The AddressPrimary class contains various variables such as id: number, city: number, and other string variables.

Once the above line executes, what will the variable addressFound contain?

Will it store a reference to the class/data object?

I am curious about this because the method containing this line "returns (addressFound)", and at another point, I have a line 

myAddress: AddressPrimary = method(id)
. When I then set myAddress.id = 7;, the corresponding class in array addressArray is updated so that its id property becomes 7.

javascriptarraysangulartypescript

Answer №1

Click here

The addressFound variable will contain the first element in addressArray with the specified id, or be undefined if none is found.

Answer №2

Array.find() will give you the first element discovered in the array, or undefined if none are found. To find the index of the first instance of an element, use Array.findIndex() instead; it will return -1 if no matching elements are found.

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