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# extracted from http//www.naturalearthdata.com/download/110m/cultural/ne_110m_admin_0_countries.zip
# under public domain terms

country_bounding_boxes = {
    'AF': ('Afghanistan', (60.5284298033, 29.318572496, 75.1580277851, 38.4862816432)),
    'AO': ('Angola', (11.6400960629, -17.9306364885, 24.0799052263, -4.43802336998)),
    'AL': ('Albania', (19.3044861183, 39.624997667, 21.0200403175, 42.6882473822)),
    'AE': ('United Arab Emirates', (51.5795186705, 22.4969475367, 56.3968473651, 26.055464179)),
    'AR': ('Argentina', (-73.4154357571, -55.25, -53.628348965, -21.8323104794)),
    'AM': ('Armenia', (43.5827458026, 38.7412014837, 46.5057198423, 41.2481285671)),

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import { useEffect, useRef, useCallback } from 'react';

const useStateWithPromise = (state, setState) => {
    const resolverRef = useRef(null);

    useEffect(() => {
        if (resolverRef.current) {
            resolverRef.current(state);
            resolverRef.current = null;
        }

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Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

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General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules

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<?php

namespace Deployer;

require 'recipe/laravel.php';

// Configuration
set('ssh_type', 'native');
set('ssh_multiplexing', true);
set('git_tty', true); // [Optional] Allocate tty for git on first deployment

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Laravel's Dependency Injection Container in Depth

Laravel has a powerful Inversion of Control (IoC) / Dependency Injection (DI) Container. Unfortunately the official documentation doesn't cover all of the available functionality, so I decided to experiment with it and document it for myself. The following is based on Laravel 5.4.26 - other versions may vary.

Introduction to Dependency Injection

I won't attempt to explain the principles behind DI / IoC here - if you're not familiar with them you might want to read What is Dependency Injection? by Fabien Potencier (creator of the Symfony framework).

Accessing the Container

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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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(function() {
    
    var script,
        scripts = document.getElementsByTagName('script')[0];
        
    function load(url) {
      script = document.createElement('script');
      script.async = true;
      script.src = url;
      scripts.parentNode.insertBefore(script, scripts);

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import {Sql} from "../providers/Sql";

export class ExamplePage {
    constructor(private sql: Sql) {
        //sql.query(...);
        
        //...
    }
}

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<?php
/**
 *   i changed class name as mPDO because, give me an error
 *
 *    " Fatal error: Cannot redeclare class pdo. If this code worked without the Zend Optimizer+,
 *      please set zend_optimizerplus.dups_fix=1 in your php.ini "
 */

class Mpdo
{