Function arraylike

external/.d3.js:1950–1954

(data)

// cause the data to change while iterating by using a key function, but please
// don’t; we’d rather avoid a gratuitous copy.)
function arraylike(data) {
  return typeof data === "object" && "length" in data
    ? data // Array, TypedArray, NodeList, array-like
    : Array.from(data); // Map, Set, iterable, string, or anything else
}

function selection_exit() {
  return new Selection$1(this._exit || this._groups.map(sparse), this._parents);