The answer
Return a function that collects arguments. If args.length >= fn.length, call fn(...args). Otherwise, return (...next) => curried(...args, ...next). Use recursion to keep collecting.
Currying Implementation and Examples
How do you implement a generic curry function?
More FAQs in Currying Implementation and Examples
Use nested functions: function multiply(a) { return function(b) { return function(c) { return a * b * c; }; }; }. Each function takes one argument and returns the next.
Configurable functions: const log = curry((level, msg) => ...); const error = log('ERROR'); error('something broke'). Each partial call creates a specialized function.
Yes. With the generic curry: sum(1, 2)(3) works (partial application with 2 args, then the third). The curry function checks if enough args are collected.
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