fernandocanizo

# npm basics

- Install packages locally under node_modules directory:
```
npm install <package_name>
```

- Install packages globally, useful for applications:
```
sudo npm install -g <package_name>

fernandocanizo

# Node.js tools and libraries

## Tools

- Monitor for any changes in your source code and automatically restart your server

In development:

```
sudo npm install -g nodemon

fernandocanizo

// logger = require('logger');
// logger.log_to_console(true);
// logger.log_to_folder('log','_app.log');
// logger.set_log_level('DEBUG');
// logger.info('Happy to be here.');
exports.logger = (function() {
  var that = {};
  that.levels = {
    "TRACE": 0, 
    "DEBUG": 1, 

fernandocanizo

from timeit import Timer
from operator import attrgetter
from random import randint

def timeit( stmt, setup ):
	t = Timer(stmt=stmt, setup=setup)
	print "%.2f usec/pass" % (100000 * t.timeit(number=10000)/10000)

class Person(object):
	def __init__(self, age):

fernandocanizo

A bunch of funky CSS3 Toggle Buttons

A collection of toggle buttons that use CSS3 transitions to animate their state when interacted with. Created using HTML and CSS (no JS). By Ashley Nolan.

Uses the checkbox :checked state to differentiate between state, and therefore is still semantic and accessible.

---

Twitter: https://twitter.com/AshNolan_

fernandocanizo

"use strict";


// There are three ways to check if an object has a property:

const obj = {
	one: 1
};

const otherObj = Object.create(obj);

fernandocanizo

"use strict";

const pipe = functions => data => {
    return functions.reduce((value, func) => func(value), data);
};

const pipeline = pipe([
    n => n + 1,
    n => n * 2,
    n => n * n,

fernandocanizo

"use strict";

function sleep(milliseconds) {
    return new Promise((resolve) => setTimeout(resolve, milliseconds));
}

sleep(1).then(() => console.log('finished'));

fernandocanizo

var connectionString = 'postgres://localhost:5432/postgres';
var Promise=require('bluebird');


var knex = require('knex')({
  client: 'pg',
  connection: {
      user: 'postgres',
      database: 'postgres',
      port: 5432,

fernandocanizo

The difference between XYZ and TMS tiles and how to convert between them

Lots of tile-based maps use either the XYZ or TMS scheme. These are the maps that have tiles ending in /0/0/0.png or something. Sometimes if it's a script, it'll look like &z=0&y=0&x=0 instead. Anyway, these are usually maps in Spherical Mercator.

Good examples are OpenStreetMap, Google Maps, MapBox, MapQuest, etc. Lots of maps.

Most of those are in XYZ. The best documentation for that is slippy map tilenames on the OSM Wiki, and Klokan's Tiles a la Google.