Index of object in array which has array of one object

Question

I'm working with Google Maps API in Angular (TypeScript). I want to make clickable map of countries, where you click some country it changes color. Seems easy but I'm using ng2-google-maps library for Angular which is a little bit complicated.

My problem: I need to get index of main object in array. But I need to search by value which is in this object as another object in another array.

I already get country code of clicked region in map. for example "PL" like in this console.log.

I need to get index of main array (PL has '0' index) to check if PL country already exists in this array.

I tried like this:

mainArray.findIndex((result) => result.c.findIndex((result) => result.v === 'PL'));

But it doesn't work. Then I'll need to use probably slice() method to delete found index from main array.

Thank you in advance.

Pranav C Balan · Accepted Answer · 2020-04-09 17:43:21Z

2

You are using Array#findIndex within the function which returns index or -1 so it will be falsy in case element is at position 0 and all other cases it will be truthy(non-zero numbers are truthy) so it won't work as you expected.

You can use Array#some method which returns true if condition satisfied for at least one element.

 mainArray.findIndex((result) => result.c.some((result) => result.v === 'PL'));

edited Apr 9, 2020 at 17:43

answered Apr 9, 2020 at 17:38

Pranav C Balan

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