Sorted:

API Implementation-Collection of common programming errors

push scene by tapping on image-Collection of common programming errors

Can't update user attributes – Rails and Devise-Collection of common programming errors

How to define optional parameters in Java Script-Collection of common programming errors

problem about option-Collection of common programming errors

How can I reuse JQuery dynamic tags?-Collection of common programming errors

problem about typechecking-Collection of common programming errors

A javascript design pattern for options with default values?-Collection of common programming errors

problem about ghci-Collection of common programming errors

Null and undefined in javascript-Collection of common programming errors