Comments (6)
Perhaps a simple example?
from fantasy-land.
Yeah, I want to include a description of each class. See #3.
from fantasy-land.
Set of nonempty strings might be slightly interesting, though I think when you get less structure than a monoid you are usually taking a "normal" programming structure and restricting it.
from fantasy-land.
How about Either? It seems to be one of the few semigroups that's not just a monoid missing zero
.
function Either(left, right) {
if ((typeof left !== 'undefined' && typeof right !== 'undefined') ||
(typeof left === 'undefined' && typeof right === 'undefined'))
throw new Error();
this.left = left;
this.right = right;
return this;
}
// "Takes the first `right`."
Either.prototype.concat = function(a) {
if (typeof this.right !== 'undefined')
return new Either(undefined, this.right);
else
return new Either(a.left, a.right);
};
from fantasy-land.
We don't have to only work with structures that are strictly semigroups. If it's a monoid, then it's a semigroup by definition, and there's a whole mess of those. You just don't worry about what the identity does if you come in contact with it.
from fantasy-land.
Is this still going to be the intention or we happy to close this one?
from fantasy-land.
Related Issues (20)
- [Question] Type signature for ap HOT 2
- Adding Folktale to implementations.md
- Equivalent for Serial typeclass? HOT 1
- Is really necessary specify "No parts of <...> value should be checked"? HOT 11
- Add Traversable1 HOT 3
- Help understanding use of identity in Traversable laws HOT 2
- Fantasy Land specification version number HOT 1
- Switch to Symbols HOT 2
- Wrong argument in Traversable HOT 4
- Is monet.js compatible? HOT 1
- Why FL specifies the ChainRec typeclass when there is the trampoline monad? HOT 7
- What does "and" mean? HOT 2
- Can someone explain me how I should understand Semigroup? HOT 5
- Remove all OOP features HOT 21
- Traversable and Foldable use multiple variables as arguments HOT 12
- Profunctor should require Contravariant HOT 10
- Implementation of `Compose` is confusing HOT 3
- should Chain properties depends on fantasy-land/ap (and possibly .map)? HOT 4
- Why putting "fantasy-land/" before everything in readme? HOT 3
- Is `Pair` a valid instance of `MonadRec`?
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from fantasy-land.