Array of objects – how to group items by property and squash data from each of grouped items into 1

Advertisements I am trying to perfom operation on array that is described in topic. What i’ve done already – group by common property + map data of each item to desired format. It was achieved by using reduce + map function inside it. Now i need final part that is going to squash each of… Read More Array of objects – how to group items by property and squash data from each of grouped items into 1