Find last matching object in array of objects

Question

I have an array of objects. I need to get the object type (\"shape\" in this example) of the last object, remove it, and then find the index of the previous object in the ar

Answer 1

This is a solution that does not depend on reverse, and therefore does not require "cloning" the original collection.

const lastShapeIndex = fruits.reduce((acc, fruit, index) => (
    fruit.shape === currentShape ? index : acc
), -1);