tuan

function mapWith (fn) {
  return (list) => {
    return Array.prototype.map.call(
      list, 
      (value) => fn.call(this, value))
  }
}

tuan

function once(fn) {
  let done = false;
  
  return function(...args) {
    if (done) {
      return void 0;
    }
    
    done = true;
    return fn.apply(this, args);

tuan

const RomanNumerals = {
    1000: 'M',
     500: 'D',
     100: 'C',
      50: 'L',
      10: 'X',
       5: 'V',
       1: 'I'  
};

tuan

let pipe = (value, ...funs) => {
  return funs.reduce((accumulator, currentFun) => currentFun(accumulator), value);
}

let add1 = x => x + 1;
let multiply2 = x => x * 2;

pipe(10, add1, add1, multiply2, console.log);

tuan

const once = (fun, timeoutInMilliseconds) => {
  let inProgress = false;
  
  setTimeout(() => {
    inProgress = false;
  }, timeoutInMilliseconds);
  
  return () => {
    if (inProgress) {
      return;

tuan

class Program
{
    static void Main(string[] args)
    {
        var stopwatch = new Stopwatch();
        stopwatch.Start();
        UploadToBlobAsync().Wait();
        stopwatch.Stop();
        Debug.WriteLine("Elapsed time in seconds: " + stopwatch.ElapsedMilliseconds / 1000);
    }

tuan

public async Task SendMailAsync(MailMessage message, CancellationToken ct)  
{
    try
    {
        var task = _smtpClient.SendMailAsync(message);
        using (ct.Register(_smtpClient.SendAsyncCancel))
        {
            try
            {
                await task;

tuan

public class SmtpClientWrapper : IDisposable  
{
    private SmtpClient _smtpClient;

    public SmtpClientWrapper(SmtpClient smtpClient)
    {
        this._smtpClient = smtpClient;
    }

    public async Task SendMailAsync(MailMessage message, CancellationToken ct)

tuan

class Program
{
    static void Main(string[] args)
    {
        var stopwatch = new Stopwatch();
        stopwatch.Start();
        UploadToBlobAsync().Wait();
        stopwatch.Stop();
        Debug.WriteLine("Elapsed time in seconds: " + stopwatch.ElapsedMilliseconds / 1000);
    }