molstar
Version:
A comprehensive macromolecular library.
36 lines • 1.28 kB
JavaScript
;
/**
* Copyright (c) 2018 mol* contributors, licensed under MIT, See LICENSE file for more info.
*
* @author Alexander Rose <alexander.rose@weirdbyte.de>
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.DefaultMap = void 0;
/** A `Map` instance with a `getDefault` method added. */
function DefaultMap(valueCtor) {
var map = new Map();
map.getDefault = function (key) {
if (map.has(key))
return map.get(key);
var value = valueCtor();
map.set(key, value);
return value;
};
return map;
}
exports.DefaultMap = DefaultMap;
// TODO currently not working, see https://github.com/Microsoft/TypeScript/issues/10853
// /** A `Map` with a `getDefault` method added. */
// export class DefaultMap<K, V> extends Map<K, V> {
// constructor(private valueCtor: () => V, entries?: ReadonlyArray<[K, V]>) {
// super(entries)
// }
// /** Return the value for `key` when available or the default value otherwise. */
// getDefault(key: K) {
// if (this.has(key)) return this.get(key)!
// const value = this.valueCtor()
// this.set(key, value)
// return value
// }
// }
//# sourceMappingURL=map.js.map