Paul Felice

feat: add features: filter and fold

1

Added breaking changes, which are not necessarily desired: - `Maybe` `from` is always nullable - `Maybe#map` is the same as `.chain(x => fromNullable(fn(x)))` - Added `fold/match` to `Maybe` - Added...

Add a mapNullable

1

It would be awesome to have a map that caters for nullable values and would return `none` if it's so. At the moment I use ``` just(4).chain(x => fromNullable(add2(x))) ```...