@casual-simulation/aux-common
Version:
Common library for AUX projects
51 lines • 1.65 kB
JavaScript
/* CasualOS is a set of web-based tools designed to facilitate the creation of real-time, multi-user, context-aware interactive experiences.
*
* Copyright (c) 2019-2025 Casual Simulation, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
export function first(iterator) {
for (let node of iterator) {
return node;
}
return undefined;
}
/**
* Gets the last value from the given iterator.
* Returns undefined if the iterator contains no values.
* @param iterator The iterator.
*/
export function last(iterator) {
let last = undefined;
for (let node of iterator) {
last = node;
}
return last;
}
/**
* Gets the item at the given index in the iterator.
* @param iterator The iterator.
* @param item The index of the item to get.
*/
export function nth(iterator, item) {
let count = 0;
for (let node of iterator) {
if (count === item) {
return node;
}
count += 1;
}
return null;
}
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