CODEWITHSUNDEEP
javascript
Sanjay Shr
Sanjay Shr

Reputation: 2152

How to return index and value of the specific element from array on callback using any JavaScript array function?

I tried with filter() function but I'm not sure about returning index and value using that. here's sample code that I tried.

var names = ['A', 'B', 'C', 'D', 'E', 'F', 'G']
const name = names.filter((name, index) => name === 'G' ? console.log(${index}: ${name}) : null)

here variable name is useless because on call back I'm returning nothing. However, I can access index and name inside callback but not sure about returning both.

Upvotes: 0

Views: 262

Answers (1)

gurvinder372
gurvinder372

Reputation: 68393

Use findIndex instead

var names = ['A', 'B', 'C', 'D', 'E', 'F', 'G'];
var valToFind = "G";
const valIndex = names.findIndex( s => s === valToFind );

you already know that the value is valToFind, so no need to return it.

Or as @PaulPro pointed out, if the values are just strings, then simply use 

const valIndex = names.indexOf( valToFind );

Or you can wrap it in an object

var output = { name : valToFind, index : names.indexOf( valToFind ) };

Upvotes: 1

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