String repeat のアルゴリズムとパフォーマンス - hogehoge @teramako
ES6になると、String.prototype.repeatのメソッドが追加されるわけだが、そのアルゴリズムとパフォーマンスを追ってみている。 ES6 String.prototype.repeat の仕様では以下の様な感じでシンプルな書き方をしている。 countが 0 より小さい、または 無限大である場合は RangeError count 0 ならば、空文字列 そうでない場合は、count回、文字列を繰り返して連結する 単純に実装すれば、以下の様な感じで済む。 String.prototype.repeat = function (count) { if (count < 0 || !Number.isFinite(count)) throw new RangeError(); var result = "", str = this; for (var i = 0; i < cou
A* pathfinding algorithm in JavaScript
A JavaScript implementation of the A* algorithm for pathfinding and graph traversal. Designed for browser-based games using HTML5/canvas with JavaScript. Your browser must support canvas to view this demo. Your browser must have JavaScript enabled.
Face Detection in JavaScript via HTML5 Canvas
Badass JavaScriptA showcase of awesome JavaScript that pushes the boundaries of what's possible on the web, by @devongovett. You have probably seen face detection at work in programs like iPhoto and Picasa, but what if you could do that performantly in JavaScript? Chinese developer Liu Liu has done the honors, and implemented the algorithm using the canvas element. The algorithm is implemented on
Algorithm Ink - AzarAsk
Using algorithms to solve problems can be a wonderful option when the result must be 100% exact or if each decision must follow the same method. A different method might be required if performance is the most important consideration. Approaching a problem the proper way can often be the key to finding a solution that works. An algorithm is a term used in psychology to describe a few of these probl
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GitHub - google/diff-match-patch: Diff Match Patch is a high-performance library in multiple languages that manipulates plain text.
