czarneckid

NOTE: You will need at least Redis 2.1.6 to use the ZREVRANGEBYSCORE method.

Add players to HIGHSCORES table:

	fossil:~ dczarnecki$ redis-cli 
	redis> zadd HIGHSCORES 1 player_1
	(integer) 1
	redis> zadd HIGHSCORES 2 player_2
	(integer) 1
	redis> zadd HIGHSCORES 3 player_3

domenic

This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.

You're Missing the Point of Promises

Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:

getTweetsFor("domenic", function (err, results) {
 // the rest of your code goes here.

tsiege

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!






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straker

Basic Snake HTML and JavaScript Game

Snake is a fun game to make as it doesn't require a lot of code (less than 100 lines with all comments removed). This is a basic implementation of the snake game, but it's missing a few things intentionally and they're left as further exploration for the reader.

Further Exploration

• Score
• When the snake eats an apple, the score should increase by one. Use context.fillText() to display the score to the screen

renoirb

/**
 * Based on work from krasimirtsonev
 *
 * http://krasimirtsonev.com/blog/article/csssteal-chrome-extension-that-extracts-css
 */

// helper function for transforming 
// node.children to Array
function toArray (obj, ignoreFalsy) {
    var arr = [], i;

straker

Basic Pong HTML and JavaScript Game

This is a basic implementation of the Atari Pong game, but it's missing a few things intentionally and they're left as further exploration for the reader.

Further Exploration

• Score
• When a ball goes past a paddle, the other player should score a point. Use context.fillText() to display the score to the screen

cameel

Use cases

• Optional/nullable data types.
• Variant data types.
• Flag with extra information needed only in some cases (or different in different cases).
• Modeling states in a state machine where each state can have some data associated with it.
• List of operations for batch processing, where each operation can have its own arguments.
• Alternative to function overloading that allows avoiding combinatorial explosion when there are multiple parameters that need variants.
• Nested data structures with heterogenous nodes.

Syntax and semantics

hrkrshnn

Upgrade to at least 0.8.4

Using newer compiler versions and the optimizer gives gas optimizations and additional safety checks for free!

The advantages of versions 0.8.* over <0.8.0 are:

• Safemath by default from 0.8.0 (can be more gas efficient than some library based safemath).
• Low level inliner from 0.8.2, leads to cheaper runtime gas. Especially relevant when the contract has small functions. For