Can`t realize ap composition about fluture HOT 6 CLOSED

I think you might be reading an outdated version of the Fantasy Land spec. Since version 1.0, Fantasy Land has required compliant methods to be prefixed:

v['fantasy-land/ap'](u['fantasy-land/ap'](a['fantasy-land/map'](f => g => x => f(g(x))))) is equivalent to v['fantasy-land/ap'](u)['fantasy-land/ap'](a)
-- https://github.com/fantasyland/fantasy-land#apply

You'll find that v['fantasy-land/ap'] will behave as expected.

from fluture.

Does the ap method not meet the requirements of fantasy-land? If so what specification is it using?

from fluture.

The fantasy-land/ap method follows the specification. The ap function is a polymorphic dispatcher which dispatches to fantasy-land/ap. There is no specification for dispatchers. Library authors are free to implement them as they see fit.

from fluture.

As I understand ap fallbacks to fantasy-land/ap only if context is not Future, right?

from fluture.

That's an optimization for performance and debugging reasons made within the Fluture code. It does not alter the behaviour of ap compared to what it would be as a plain dispatcher to m['fantasy-land/ap'].

from fluture.

In other words, the following code can be removed:

...And all unit tests except the ones related to error messages and debugging will still pass.

from fluture.