Some key methods to know:
map: maps a set of iterators to a closure.filter: keeps elements with a closure that evaluates to true.all: checks if all elements in an iterator meets a certain condition, returnsbool. If it meets any false, it’ll stop immediately.count: counts the number of elements associated with a set of iterators.collect: aggregates the iterator values into a single data structure (i.e., a vector or hash map).sum: takes a numerical sum.fold: accumulates values across a