es-toolkit

import { cloneDeep, isEmptyObject, throttle, mapAsync, retry, } from 'es-toolkit'; interface User { id: number; name: string; data?: Record<string, any>; } const users: User[] = [ { id: 1, name: 'Alice', data: { age: 30 } }, { id: 2, name: 'Bob', data: {} }, { id: 3, name: 'Charlie' }, ]; // Example 1: Deep cloning objects const clonedUsers = cloneDeep(users); console.log('Cloned Users:', clonedUsers); console.log('Are they the same object reference?', clonedUsers === users); // false // Example 2: Checking for empty objects const userWithEmptyData = users[1]; console.log(`User ${userWithEmptyData.name} has empty data:`, isEmptyObject(userWithEmptyData.data)); // Example 3: Throttling a function let count = 0; const throttledIncrement = throttle(() => { count++; console.log('Throttled increment called, count:', count); }, 100); throttledIncrement(); setTimeout(throttledIncrement, 50); // Will not trigger setTimeout(throttledIncrement, 150); // Will trigger again // Example 4: Asynchronous mapping const fetchUserData = async (id: number) => { await new Promise(resolve => setTimeout(resolve, 50 * id)); // Simulate async return { id, status: 'fetched' }; }; (async () => { const userStatuses = await mapAsync(users, async (user) => { return fetchUserData(user.id); }); console.log('User statuses:', userStatuses); })(); // Example 5: Retrying a failing operation let attempt = 0; const flakyOperation = async () => { attempt++; if (attempt < 3) { console.log(`Flaky operation attempt ${attempt}: Failing...`); throw new Error('Transient error'); } console.log(`Flaky operation attempt ${attempt}: Succeeded!`); return 'Success'; }; (async () => { try { const result = await retry(flakyOperation, { retries: 5, delay: 100 }); console.log('Retry result:', result); } catch (e) { console.error('Retry failed:', (e as Error).message); } })();