Feature/parcel node

[dxinteractive]

Addresses #246

dataparcels

• BREAKING CHANGE remove Parcel.move()
  • Instead you can use unmutable's move() with asNodes() like this: parcel.update(asNodes(move(a,b)))
• Add dataparcels/asNodes
• Add dataparcels/ParcelNode

react-dataparcels

• Add react-dataparcels/asNodes
• Add react-dataparcels/ParcelNode

The asNodes function is a kind of parcel updater that allows for adding, removing and re-arranging child values.

It must be passed a function, whose first argument will be your Parcel’s value, but with all child values replaced with ParcelNode instances. You can move and remove these as you like. You can also insert non-ParcelNode values into the parent data shape to set new data. The function passed to asShape() will also sometimes receive a ChangeRequest as a second parameter depending on what the asNodes() function is being passed into.

let parcel = new Parcel({
    value: [1,2,3]
});

// reverse the parcel's children
parcel.update(asNodes(
    shape => shape.slice().reverse() // clones and reverses the shape array
));

// new value is [3,2,1]