Comment by ReleaseCandidat

No, not exactly. And partial application of any function is nowadays possible using anonymous functions to wrap the original one, no need for constructors and special methods.

What currying in Haskell and any other ML does, is the following as Javascript. Let's say we have a function with four parameters `func(a, b, c, d) {return a + b + c + d;}`, then the curried version is the following:

   func = (a) => {
     return (b) => {
       return (c) => {
         return (d) => a + b + c + d;
      } 
     } 
    }