web Get understand user-agent string from browser Let see an example of a user-agent stringMozilla/5.0 (Linux; Android 7.1.1; TONE-m17) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.89 Mobile Safari/537.36This is a
programming Promise based semaphore pattern in Javascript Lets start with singleton pattern when you want to instantiate at most one instance of a class, or lazily initiate a value.let instance const getInstance = () => instance === undefined ? instance = initiateInstance()//this is
programming Practical coding with multiple timezone It is normal situation that the server, client, database have different timezone.In this blog post, I will introduce my coding practice to handle multiply timezone in web development.To check current timezone
