#polling code explainers

rust

use std::collections::HashSet;
use std::fs;
use std::path::{Path, PathBuf};
use std::thread;

Polling a directory for new files in Rust

polling filesystem callbacks

Intermediate 6 steps

go

package logtail
 
import (
	"bufio"

How a tail -f follower works in Go

io context channels

Intermediate 10 steps

typescript

import { Injectable, inject } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable, timer, throwError } from 'rxjs';
import { switchMap, takeWhile, filter, take, catchError } from 'rxjs/operators';

Polling a job until it finishes in Angular

rxjs polling observables

Intermediate 7 steps

ruby

require 'set'
 
class DirectoryWatcher
  def initialize(path, pattern: '**/*', interval: 1.0)

Polling for file changes in Ruby

polling filesystem diffing

Intermediate 7 steps

javascript

import { useEffect, useState } from 'react';
 
export function useJobStatus(jobId, { interval = 3000 } = {}) {
  const [status, setStatus] = useState('pending');

Polling a job status with a React hook

custom-hooks polling cleanup

Intermediate 8 steps

php

<?php
 
namespace App\Http\Controllers;

Streaming job progress with SSE in Laravel

server-sent-events streaming polling

Advanced 8 steps

python

import os
import time
from pathlib import Path

Polling a directory for file changes in Python

polling filesystem set-operations

Intermediate 8 steps

typescript

interface PollOptions<T> {
  intervalMs?: number;
  timeoutMs?: number;
  signal?: AbortSignal;

A cancellable polling helper in TypeScript

polling async-await abortsignal

Intermediate 9 steps

javascript

async function pollJobUntilComplete(jobId, { interval = 2000, timeout = 60000, signal } = {}) {
  const deadline = Date.now() + timeout;
 
  while (true) {

Polling a job until it finishes in JavaScript

polling async-await abortsignal

Intermediate 6 steps