compose - Compose allows you to dynamically create expressions by supplying it with a list of iterators.
eval - This is the by far most important slot in Hyperlambda, since it’s arguably “the heart” of Hyperlambda, allowing Hyperlambda to execute.
invoke - This slot works similarly to [eval], except it treats the invocation similarly to an invocation to a dynamic slot, allowing you to pass in arguments, and return nodes from the invocation.