task-batcher.js

let timeout = null;
const queue = new Set();
function process() {
  for (const task of queue) {
    task();
  }
  queue.clear();
  timeout = null;
}

function enqueue(task) {
  if (timeout === null) timeout = setTimeout(process, 0);
  queue.add(task);
}

// Example for batching API calls
const apiClient = {
  batchUpdateUsers(updates) {
    console.log("API called with updates:", updates);
  },
};

const pendingUpdates = {};

function scheduleUserUpdate(userId, fieldName, value) {
  if (!pendingUpdates[userId]) {
    pendingUpdates[userId] = {};
  }

  pendingUpdates[userId][fieldName] = value;

  if (timeout === null) {
    enqueue(() => {
      const updates = { ...pendingUpdates };

      for (const userId in pendingUpdates) {
        delete pendingUpdates[userId];
      }

      apiClient.batchUpdateUsers(updates);
    });
  }
}

scheduleUserUpdate("user123", "name", "John Smith");
scheduleUserUpdate("user123", "email", "[email protected]");
scheduleUserUpdate("user456", "status", "active");

/* result:
API called with updates: {
  user123: { name: 'John Smith', email: '[email protected]' },
  user456: { status: 'active' }
} */