dthree is a small helper inspired by d3 selection module for data join.
It splits a selection (populated by an Iterable) into 3 distinct arrays : enter, updateandexit`.
Unlike its d3 counterpart, it doesn't bind the data to the DOM and solely return the arrays.
We use it when doing datavis in WebGL.
yarn add @seracio/dthree
import dthree from '@seracio/dthree';
// create a new selection
const mySelection = dthree.selectAll('myNamespace');
// bind data
mySelection.data([0,1,2,3]);
assert.deepEqual(mySelection.enter(), [0,1,2,3]);
assert.deepEqual(mySelection.update(), []);
assert.deepEqual(mySelection.exit(), []);
// re-bind data
mySelection.data([0,1,2]);
assert.deepEqual(mySelection.enter(), []);
assert.deepEqual(mySelection.update(), [0,1,2]);
assert.deepEqual(mySelection.exit(), [3]);`
// use a getKey function to bind data (we use index by default)
mySelection.data([0,1,2], (value, index) => `${value}_${index}`);- dthree.selectAll(namespace: string): Selection
Create or get a selection
- selection.data(data: Iterable, getKey: ?(value, index) => string): Selection
Update data, if getKey is not provided, we'll use the array indexes as key
- selection.enter(): Array
Returns the newly created data
- selection.update(): Array
Returns the newly updated data
- selection.exit(): Array
Returns the newly removed data
- selection.all(): Array
Returns the enter + update data
MIT License
Copyright (c) 2017 serac.io
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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