Every `curry` implementation I’ve met is broken in some way.

Let’s think what `curry` function should do. First: is should implement valid currying. Second: it should keep function name untouched. Third: it should keep function length. Fourth: it should allow to bind `this` after any number of arguments (until last).

Missed name? Expect bugs. Missed length. Expect bugs. Etc.

Not a rocket science, right? Then why every existing curry implementation is broken?

Curry

Ramda

Lodash

functional-js

let sum3 = curry((x, y, z) => {
  if (this) {
    return [x + y + z, this];
  } else {
    return x + y + z;
  }
});

// Cannot assign to read only property ‘name’ of function

omg…

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Working one?

https://gist.github.com/ivan-kleshnin/00e644470e57d38239c1

Go, check it out yourself.