savarin

"""Simple implementation of a B+ tree, a self-balancing tree data structure that (1) maintains sort
data order and (2) allows insertions and access in logarithmic time.
"""

class Node(object):
    """Base node object.

    Each node stores keys and values. Keys are not unique to each value, and as such values are
    stored as a list under each key.

pingf

import bisect
import itertools
import operator


class _BNode(object):
    __slots__ = ["tree", "contents", "children"]

    def __init__(self, tree, contents=None, children=None):
        self.tree = tree

mrcthms

function enzyme() {
  mocha --grep $1 src/**/*.spec.js
}

bag-man

'use strict'

const MongoClient = require('mongodb')

class Database {

  constructor (uri) {
    this.uri = uri
    this.db = {}
    return this

magegu

/*
by Martin Güther @magegu

just call it: 

uploadFile(absoluteFilePath, callback);
*/

var path = require('path');
var async = require('async');

amysimmons

#Understanding closures, callbacks and promises

For a code newbie like myself, callbacks, closures and promises are scary JavaScript concepts.

10 months into my full-time dev career, and I would struggle to explain these words to a peer.

So I decided it was time to face my fears, and try to get my head around each concept.

Here are the notes from my initial reading. I'll continue to refine them as my understanding improves.

Zequez

# If you worked with React and JSX you probably noticed that you can't use JS comments when inside JSX sections
# Add this to your Atom init script
# Then add 'ctrl-cmd-/': 'comment-jsx' to your keymap.cson
# Then when you are on a JS/JSX file, just press cmd+ctrl+/ to use JSX-style comments that work with JSX elements
# Is not the most efficient way, but it's the cleanest and reliable one

atom.commands.add 'atom-workspace', 'comment-jsx', ->
  atom.config.set('editor.commentStart', '{/*', {scopeSelector: '.source.js.jsx'})
  atom.config.set('editor.commentEnd', '*/}', {scopeSelector: '.source.js.jsx'})
  for selection in atom.workspace.getActiveTextEditor().selections

apolloclark

Postgres Cheatsheet

This is a collection of the most common commands I run while administering Postgres databases. The variables shown between the open and closed tags, "<" and ">", should be replaced with a name you choose. Postgres has multiple shortcut functions, starting with a forward slash, "". Any SQL command that is not a shortcut, must end with a semicolon, ";". You can use the keyboard UP and DOWN keys to scroll the history of previous commands you've run.

Setup

installation, Ubuntu

http://www.postgresql.org/download/linux/ubuntu/ https://help.ubuntu.com/community/PostgreSQL

jmarceli

1

You will get one of these:

Uncaught (in promise) TypeError: Cannot read property 'toUpperCase' of undefined(…)

ReactCompositeComponent.js:870 Uncaught TypeError: Cannot read property 'displayName' of undefined

if you try to:

joepie91

Promises reading list

This is a list of examples and articles, in roughly the order you should follow them, to show and explain how promises work and why you should use them. I'll probably add more things to this list over time.

This list primarily focuses on Bluebird, but the basic functionality should also work in ES6 Promises, and some examples are included on how to replicate Bluebird functionality with ES6 promises. You should still use Bluebird where possible, though - they are faster, less error-prone, and have more utilities.

I'm available for tutoring and code review :)

You may reuse all gists for any purpose under the WTFPL / CC0 (whichever you prefer).