Essential vector methods missing?

[Timotheus Szekely]

Hello, I've started using mori on an experimental project a few weeks ago and all was good until I wanted to do some updates on a vector.

1 . The first thing I tried to do was to update an object from the vector, based on its ID
Since there is no update method for vectors, I'd naturally do something like:

• find the element's index
• update/replace the element at index

...but there is no "findIndex" method. the closest thing to a real find method is "some", but it doesn't give you the index, just the value.

I ended up doing:

files: mori.map(
        file => (
          file.getId() === fileInfo.id ?
            file.setInfo(fileInfo) :
            file
        ),
        state.files
      )

but this seems kind of inefficient.

2 . Add some elements to the vector, replacing the existing ones with the same ID (but maybe different values in other properties)

This was very tedious, and I ended up converting the vector to array, doing the operations and then converting the resulting array back to vector. Again, inefficient.

I tried using a set, but both elements with same ID ended up in the result and there's no way of defining the equality check predicate.

Am I missing something here or mori's missing some pretty important things?

[Sergio Diaz]

You do that with the updateIn function.

this is the function signature
mori.updateIn(coll, keys, function)

and this is the example from the documentation
var h = mori.hashMap("foo", mori.vector(1, 2, 3)); mori.updateIn(h, ["foo", 1], mori.inc); // => {"foo" [1 3 3]}

the second parameter is an array of the keys, you can use this for nested collections as well as for simple collections.