title: When to use 'with' function and why is it good?
body: <p>What are the benefits of using <code>with()</code>? In the help file it mentions it evaluates the expression in an environment it creates from the data. What are the benefits of this? Is it faster to create an environment and evaluate it in there as opposed to just evaluating it in the global environment? Or is there something else I'm missing?</p>