Question 171165 in Javascript Question posted in
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What does array.find() return in Typescript/Javascript?

I have the next line in Typescript

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

AddressPrimary is a class that has a few variables in it one of them is id: number another one is city: number and there are more some of them are strings.

What exactly will the variable addressFound hold when the line is done?

Will it hold a pointer to the class/data?

I’m asking because the method that holds this line "returns (addressFound)" and somewhere along the line I have a line myAddress: AddressPrimary = method(id) and now when I do myAddress.id = 7; the relevant class in array addressArray changes so id gets the value 7.

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Answers


  1. 0

    https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find

    So the addressFound will be first found element in addressArray with given id. Or undefined if non is found

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  2. 0

    Array.find() returns the first element found in the array and undefined if none found.
    If you want to get the index of the first occurance of the element then you should use Array.findIndex() instead; it will return -1 if none found.

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