Introduction An ID number is a basic requirement for various online applications. There are two ways we can take advantage of ID numbers – we can verify them using their check digit to ensure that the user entered their ID…
Introduction “Da da da dum! Doesn’t that stir anything in you?” Ford Prefect, The Hitchhiker’s Guide to the Galaxy Sound and music have been an part of our society since time unknown. Impossible as it would be to describe to…
Impress.js impress.js is a beautiful piece of a presentation library that uses HTML5 elements to give you a continuous ‘infinite’ presentation surface. This allows you to develop presentations employing effects that are simply impossible using a traditional slide-based deck. The…
Introduction subskybox wrote an intimidating 5-card poker hand analyzer in four linesĀ of JavaScript. The original is somewhat tricky to understand initially:
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hands=["4 of a Kind", "Straight Flush", "Straight", "Flush", "High Card", "1 Pair", "2 Pair", "Royal Flush", "3 of a Kind", "Full House" ]; var A=14, K=13, Q=12, J=11, _ = { "ā ":1, "ā£":2, "ā„":4, "ā¦":8 }; function rankPokerHand(cs,ss) { var v, i, o, s = 1<<cs[0]|1<<cs[1]|1<<cs[2]|1<<cs[3]|1<<cs[4]; for (i=-1, v=o=0; i<5; i++, o=Math.pow(2,cs[i]*4)) {v += o*((v/o&15)+1);} v = v % 15 - ((s/(s&-s) == 31) || (s == 0x403c) ? 3 : 1); v -= (ss[0] == (ss[1]|ss[2]|ss[3]|ss[4])) * ((s == 0x7c00) ? -5 : 1); document.write("Hand: " + hands[v] + (s == 0x403c?" (Ace low)":"")+"<br/>"); } |
Of course, by somewhat tricky I mean extremely tricky, and by initially I mean always. The shock and…
In an attempt to bring some sort of order to my JavaScript projects, I’m introducing the require.js library. As it says, require.js is a Javascript file and module loader.
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<script src="scripts/requirement34aFinal.js"></script> |
This means that I can break away from HTML files…
Introduction Standard musical notation is extremely expressive but has an incredibly steep learning curve. Although it can specify notes andĀ durationĀ precisely it takes practice and time to learn how to convert from what you see to how you play it. For…
Introduction This article is focused at developers who already know what the HTML5 canvas tag is all about, but would like to learn how to use it. Some familiarity with Javascript will assist, but I’ll explain everything from basic principles…