select
ts
function LSM.select<T>(lsm: LSM<T>, selectable: T): LSM<T>;Adds an item to the current selection without clearing existing selections.
This creates a new anchor at the selected item, enabling independent selection ranges.
Example
ts
import { LSM } from "@monstermann/lsm";
let lsm = LSM.create(["a", "b", "c", "d", "e"]);
lsm = LSM.goTo(lsm, "a");
lsm.selected; // ["a"]
lsm = LSM.select(lsm, "c");
lsm.selected; // ["a", "c"]
lsm = LSM.select(lsm, "e");
lsm.selected; // ["a", "c", "e"]