fragment()
Syntax: fragment(Block[])
Example: fragment([block, block, block])
The fragment function is used to create a Block list. It's the best way to loop over an array. As the array changes, fragment() updates or moves items in the DOM rather than recreating them. Let's look at an example:
import { block, patch, fragment } from 'million';
const oldList = [1, 2, 3];
const newList = [3, 2, 1];
const list = block(({ item }) => {
return <div>{item}</div>;
});
// updates list efficiently (only 2 moves instead of 3 updates)
patch(
document.body,
fragment(oldList.map((item) => list({ item }))),
fragment(newList.map((item) => list({ item }))),
);