§ Things I wish I knew when I was learning APL

• For pasting multi-line code, there is a bug in the bug tracker for RIDE . For multi-line dfns, one can use ∇. For multi-line values, I don't know yet.

• Operators in APL terminology (such as ¨) are higher order functions. Thus, an operator allows one to modify known functions.

• Use ]disp and ]display to understand the structure of APL arrays.

• Set ]box on -style=max to always enable drawing arrays with ]display. This is supremely useful as a newbie to understand array structure.

• Set ]box on -trains=parens to render trains as trees. Super helpful when attempting to grok train code.

• Set ]boxing on to enable boxing for trains, arguments, everything.