Considere não usar for loops

[aureliojargas]

Use Array.forEach, Array.map e Array.filter.

Sobre:

• http://www.codereadability.com/coding-without-loops/
• https://www.sitepoint.com/quick-tip-stop-writing-loops-start-thinking-with-maps/

Polyfills para IE < 9:

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach#polyfill
• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map#Polyfill
• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter#polyfill