Merge arrays with condition

Question

I would like to merge two arrays with specific condition and update objects that they are containing.

First my struct that is in arrays:

struct Item          


        

Answer 1

The map function cannot directly mutate its elements. And since you're using structs (passed by value), it wouldn't work anyway, because the version you see in $0 would be a different instance than the one in the array. To use map correctly, I'd use a closure like this:

fisrtArray = zip(fisrtArray, secondArray).map() {
   return Item(id: $0.id, name: $1.name, value: $0.value)
}

This produces the result you're expecting.

Now, if your structs were objects (value types instead of reference types), you could use forEach and do the $0.name = $1.name in there.