Description

Implement basic Stream ability operations.

In functional languages, functions like filter, map, and reduce are very common. Implement a series of basic functional combinators for a stream ability without using existing functions. You'll need to write your own ability handlers for this.

💡 We're going to call this ability MyStream to avoid conflicting with the existing Stream ability in the standard library.

The operations you'll need to implement are:

• MyStream.fromList (given a list of elements, create a stream of elements )
• MyStream.toList (given a stream of elements, materialize it to a list)
• MyStream.toListWithResult (given a stream of elements, materialize it to a list alongside the result of the stream function)
• MyStream.ignore (given a stream of elements, ignore the emitted values, returning the results of the stream function)
• MyStream.filter (given a predicate and a MyStream, return the MyStream of all items for which predicate(item) is true);
• MyStream.map (given a function and a MyStream, return the MyStream of the results of applying function(item) on all items);
• MyStream.flatMap (given a function which produces a MyStream and a MyStream, return the MyStream of the results of applying function(item) on all items)