This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
I've come across some jQuery code that checks the length of the wrapped set before performing certain "getting rid of" methods, such as hide() or remove(). Presumably, the coder's intent is only to call hide() or remove() if there's actually something matched to hide or remove.
Elsewhere in the same code (presumably written by the same person, or team), there's no length check before other operations: