karlpokus

// MAPPY
Array.prototype.mappy = function(fn, that) {
  var out = [],
      x,
      that = that || {};

  for (var i = 0; i < this.length; i++) {
    x = fn.call(that, this[i], i, this);
    out.push(x);
  }

karlpokus

// This only works if you call - return next - in your middleware. Otherwise the cb (i.e next) won't return anything and the var will be undefined
// And you don't even need node - You can run it in a browser - Totally runtime agnostic
// Reference -> https://github.com/karlpokus/konstapel/blob/master/test/tests.js
var test = require('tape'),
    m = require('module');

test('.usernameIsValid', function(t){
  // mock req, res and next
  var pass = m.usernameIsValid({user: {}}, null, function(){ return true }),
      fail = m.usernameIsValid({}, null, function(err){ return err });

karlpokus

// start
console.time('foo');

// do stuff

// end
console.timeEnd('foo');

// log output will be in ms -> foo: 268ms

karlpokus

// completely mute
console.log = function() {};

// captured data in log
var log = [];
console.log = function() {
  log.push([].slice.call(arguments));
};

// fancy namespaced version. Demo -> http://codepen.io/KarlPokus/pen/rLwXQX/

karlpokus

// from http://appendto.com/2010/10/how-good-c-habits-can-encourage-bad-javascript-habits-part-1/

(function(foo, $, undefined){ // parameters
  // private var in closure
  var data = [1, 2, 3];
  // public fn
  foo.moo = function() {
    console.log(data);
  }
  return foo;

karlpokus

// Like this -> https://github.com/fakemongo/fongo

// Based on this wrapper API from the shell
db[collectionName].query({selectors}, {projections}, cb(err, data));

// Pass dummy data to constructor
var db = new Fongo({
  collections: [],
  users: [ // should match to array above
    {} // simple objects

karlpokus

var matches = ["sun", "clouds", "rain", "hail", "snow"].filter(/./.test, /i/);

karlpokus

#!/bin/bash

# simple GET
curl <url>

# POST w json
curl -X POST -H "Content-Type: application/json" -d '{"data":"POST with json"}' <url>

# POST w urlencoded
curl -X POST -H "Content-Type: application/x-www-form-urlencoded" -d 'foo=1&boo=2' <url>

karlpokus

// Problem: Callbacks are called with the window object as <this>
// Solution: Bind all functions to their object
// An implementation of http://underscorejs.org/#bindAll
// Demo -> http://codepen.io/KarlPokus/pen/Lkwqyj
function bindAll(x) {
  var wat = Object.prototype.toString;
  if (wat.call(x) === '[object Object]') {
    x = [x];
  }  
  if (wat.call(x) === '[object Array]') {

karlpokus

Submit PR via https://docs.npmjs.com/cli/link

What you want

• You want B to depend on A but
• A is not on npm (or it is - but you don't feel like publishing after each fix)

npm link

• While standing in A npm link makes a global package of A. Verify by npm ls -g --depth=0.
• A can then be used by B by doing npm link A while inside B. Verify by npm ls --depth=0.