Currying interview questions

Implement a function that transforms a multi-argument function into a chain of single-argument calls.

Implement a flexible curry where each call can supply any number of arguments until the original arity is reached.

Extend curry with placeholder support, so arguments can be supplied in any position across calls.

Implement partial and partialRight — pre-fill some of a function's arguments, with placeholder support.

Implement a curried sum function that accepts numbers one call at a time and returns the running total when invoked with none.

Implement a curry helper that turns a variadic function into one that can be called repeatedly with any number of arguments.