Sometimes, we want to find last index of element inside array by certain condition with JavaScript.
In this article, we’ll look at how to find last index of element inside array by certain condition with JavaScript.
How to find last index of element inside array by certain condition with JavaScript?
To find last index of element inside array by certain condition with JavaScript, we use the map and lastIndexOf methods.
For instance, we write
const lastIndex = elements.map((e) => e.a).lastIndexOf("something");
to call map and lastIndex to return an array with the a property value of each item in elements.
And then we call lastIndexOf to look for the last index of 'something' in the returned array.
Conclusion
To find last index of element inside array by certain condition with JavaScript, we use the map and lastIndexOf methods.
