dreynaud

Error Handling in Practice

My experience is mostly with Java backend services in the cloud, so the advice in this post will almost certainly be biased towards this kind of error handling. But hopefully, some of it will be generally applicable and help you maintain and debug your programs in the long run.

I don't claim that these are universal best practices, but I have found these to be useful as general guidelines. As always, use your best judgment and do things that make sense in your context.

Log the whole thing

In Java, a full exception is:

colxi

<?php
    /*
    Project Name: PHPConsole
    Usage: Upload this file to FTP space, and run it from browser.
    Description: PHPConsole is a simple and compact browser-based AJAX PHP console, that
    allows direct acces to the PHP erver-side interpreter, recieving via AJAX all your 
    code output.
    WARNING! ENSURE YOU CHANGE THE DEFAULT PASSWORD BEFORE UPLOADING!
    Version: 1.5
    Author: c0lx1

koad

//  Discord all events!
//  A quick and dirty fleshing out of the discord.js event listeners  (not tested at all!)
//     listed here -> https://discord.js.org/#/docs/main/stable/class/Client
//  Learn from this, do not just copy it mofo!
//
//  Saved to -> https://gist.github.com/koad/316b265a91d933fd1b62dddfcc3ff584
//  Last Updated -> Halloween 2022


            /*      

marcus-at-localhost

Find out where a function was called

function myFunc2Debug(){
	// output Linenumber and file where funcion was called.
	var_dump(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 1));
}


myFunc2Debug();

sagrawal31

import java.util.concurrent.TimeUnit

void convert(int secondsToConvert) {
    long millis = secondsToConvert * 1000;
    long hours = TimeUnit.MILLISECONDS.toHours(millis);
    long minutes = TimeUnit.MILLISECONDS.toMinutes(millis) % TimeUnit.HOURS.toMinutes(1);
    long seconds = TimeUnit.MILLISECONDS.toSeconds(millis) % TimeUnit.MINUTES.toSeconds(1);

    String format = String.format("%02d:%02d:%02d", Math.abs(hours), Math.abs(minutes), Math.abs(seconds));
    

gschema

Basic JavaScript MVC Implementation

Despite being derived from classical MVC pattern JavaScript and the environment it runs in makes Javascript MVC implementation have its own twists. Lets see how typical web MVC functions and then dive into simple, concrete JavaScript MVC implementation.

How Web MVC typically works

Typical server-side MVC implementation has one MVC stack layered behind the singe point of entry. This single point of entry means that all HTTP requests, e.g. http://www.example.com or http://www.example.com/whichever-page/ etc., are routed, by a server configuration, through one point or, to be bold, one file, e.g. index.php.

At that point, there would be an implementation of Front Controller pattern which analyzes HTTP request (URI at first place) and based on it decides which class (Controller) and its method (Action) are to be invoked as a response to the request (method is name for function and member is name for a variable when part of the class/object).

dave1010

<?php
// dangerously simple PHP regular expression URL router
// requires a mod_rewrite like "RewriteRule . /index.php [L]"

function get($url, $callback) {
	$matches = array();
	if (preg_match('~' . $url . '~', $_SERVER['REQUEST_URI'], $matches)) {
		echo call_user_func_array($callback, $matches);
		die();
	}