Sometimes, we want to return index value from filter method with JavaScript.

In this article, we’ll look at how to return index value from filter method with JavaScript.

How to return index value from filter method with JavaScript?

To return index value from filter method with JavaScript, we use the findIndex method.

For instance, we write

const data = [];
const fieldId = 5;
const index = data.findIndex((x) => x.id === fieldId);

to call data.findIndex with a callback to get the value with id set to fieldId.

The index of the first item in data that matches the condition will be returned.

Conclusion

To return index value from filter method with JavaScript, we use the findIndex method.