Two simple tricks in JavaScript ( olds, but always useful )
This is a quick post about two really common pieces of code that are used daily from libraries developers and not. Stop to use Math.floor The first one is about usage of Math.floor. It is probably only my opinion, but it seems that Math.floor is used always to perform the same task: var centerWidth = Math.floor((something + someelse - someother) / 2); The point is that at the end of a Math.floor, you will often find that division by 2 . There is a truly simple way to write less, and to obtain best performances as well, it is the right side bitwise operator, that for this purpose is nearly perfect. var centerWidth = (something + someelse - someother) >> 1; That's it! If you compare above examples you will note that second one is about 2X faster than Math.floor. for(var i = 0, t1 = new Date; i Math.floor(i / 2); t1 = new Date - t1; for(var i = 0, t2 = new Date; i i >> 1; t2 = new Date - t2; alert([t1, t2].join("\n")); A tricky String.indexOf Another common pie...