There are _curry1, _curry2, _curry3, and _curryN functions within the depths of Ramda's source code
This interesting pattern is also utilized in the redux compose function
I find myself pondering: why did they choose this intricate pattern over a more straightforward generic function for all scenarios?
Could it be that this pattern offers performance improvements?
Aside from Kousha's accurate response, it should be noted that the functions prefixed with an underscore in Ramda are considered internal and not meant to be accessed externally.
Ramda, which I helped create as one of its founders and primary authors, provides the exposed functions curryN and curry, while the underscore-prefixed ones are only for internal use. These functions have additional complexities, particularly in assisting with placeholders. While there could potentially be performance benefits by exposing them (as seen in Redux), we haven't found currying to significantly impact performance since implementing those helpers.
In libraries like Sanctuary, which have stricter standards, only these types of APIs would be allowed due to the prohibition of variadic inputs. On the other hand, Ramda has opted to support variadic functions to a greater extent, choosing not to follow that same approach.
This question sparked my curiosity, and after doing some research I stumbled upon this discussion. According to CrossEye's statement
The idea of directly exposing curry2 and curry3 is being considered. The main challenge would be in terms of documentation. How do we effectively explain the differences between curry, which may be less efficient but maintains context and passes all supplied arguments, and curry2/curry3, which might run faster but lose context and ignore extra arguments? However, there seem to be no major obstacles hindering the exposure of these functions.
It appears that _curry1, _curry2, _curry3 cannot simply be replaced by _curryN.
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