Comments (2)
Names have come up before : #51
from fantasy-land.
I think there is a misunderstanding.
I'm not complaining about the name map
or fmap
for aesthetic reasons which appears to be what is happening in issue #51.
My issue is that the name map
has already been taken by existing projects that we we might want to use. To give a concrete example:
I want Array.prototype.map to have the signature [a] -> (a -> b) -> [b]
but the existing implementation has the signature [a] -> (a -> num -> [a] -> b) -> [b]
. All those extra arguments in the iterator will bust up a curried function, so there is a good reason to want it to have the same signature across the board. If map
wasn't already defined on the Array prototype I could just define it myself but it is and now I'm out of luck because map
is the function that fantasy-land wants on the object and it's defined in a bad way.
Another example.
jQuery objects wrap up DOM nodes, I want to expose the functor interface of jQuery so that I can interoperate with fantasy-land things. jQuery objects already have the functor's map
method so I should be in luck, unfortunately the signature is jQuery Element -> (Number -> Element -> a) -> [a]
. If we were using a different name for the functor's map
method then I could just fill it in on jQuery myself and I would have full interoperability with all my other functors.
jQuery.fn.extend({
// :: jQuery Element -> (Element -> a) -> [a]
fmap: function(fn) {
return this.map(function(index, domElement) {
return fn(domElement);
});
}
});
Note, I've used the name fmap
in the above example but I don't really care what it's called - just something that isn't taken by other existing implementations.
from fantasy-land.
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from fantasy-land.