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d3-queue

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d3-queue

Evaluate asynchronous tasks with configurable concurrency.

  • 3.0.7
  • latest
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  • npm
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What is d3-queue?

The d3-queue npm package is a utility for managing asynchronous tasks with a focus on concurrency control. It allows you to queue up tasks and control how many of them run simultaneously, making it easier to handle multiple asynchronous operations without overwhelming the system.

What are d3-queue's main functionalities?

Queue Creation

This feature allows you to create a new queue instance. The queue can then be used to manage multiple asynchronous tasks.

const queue = require('d3-queue').queue;
const q = queue();

Adding Tasks

This feature allows you to add tasks to the queue. Each task is a function that takes a callback as its argument. The callback should be called when the task is complete.

q.defer((callback) => {
  setTimeout(() => {
    console.log('Task 1 complete');
    callback(null, 'Task 1 result');
  }, 1000);
});

q.defer((callback) => {
  setTimeout(() => {
    console.log('Task 2 complete');
    callback(null, 'Task 2 result');
  }, 500);
});

Concurrency Control

This feature allows you to control the number of tasks that can run concurrently. By default, the concurrency is set to 1, but you can specify a different number when creating the queue.

const q = queue(2); // Allow up to 2 tasks to run concurrently

Awaiting Completion

This feature allows you to specify a callback that will be called when all tasks in the queue have completed. The callback receives any error that occurred and an array of results from the tasks.

q.awaitAll((error, results) => {
  if (error) throw error;
  console.log('All tasks complete', results);
});

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Package last updated on 09 May 2017

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