Why this doesn't work with recompose and ramda?

Question

In my hoc I have this conditional;

   branch(R.propSatisfies(R.isEmpty, "repos"), renderComponent(Loader)),
// branch(R.isEmpty("repos"), renderComponent(Loader)),

What's the difference and why the socond one gives me an error? test is not a function

Same result with this as well:

branch(R.isEmpty(R.props("repos")), renderComponent(Loader)),

Answer 1

R. IsEmpty is unary function that reports whether a value is the empty value for its type (such as empty string, empty object, or empty array.). When you call it with "repos", you will get false since "repos" is not the empty string. Presumably the branch function you call wants a predicate function as the first argument and it fails when you send this boolean. Similarly, since R. props (you probably meant R.prop BTW, but the same issue would apply) is a binary function, R.props("repos") returns a function, which is not empty, so isEmpty returns false.

R.propSatisfies, on the other hand, is a ternary function accepting a predicate function, a property name, and an object. When you call it with isEmpty and "repos", you get back a function waiting for the object. That gets passed to branch and all is good.

Is there a reason you don't like the propSatisfies version?