## Encyclopedia > Currying

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# Currying

Currying is a functional programming language operation performed on functions of more than one argument, named after the logician Haskell Curry. Currying a function f of two arguments produces a function g of one argument that returns a function of one argument such that f(x, y) equals (g(x))(y), or in Lisp notation `(f x y)` equals `((g x) y)`. By extension, fully currying a function f of three arguments produces g such that f(x, y, z) equals ((g(x))(y))(z), or in Lisp notation `(f x y z)` equals `(((g x) y) z)`.

To do currying in the Scheme programming language:

``` (define curry2
(lambda (f)
(lambda (x)    ; take the first argument
(lambda y    ; and the rest of the args as a list
(f x . y)))))
```

If g equals `(curry2 f)`, then `(f x y)` equals `((g x) y)`, and `(f x y z)` equals `((g x) y z)`.

These languages automatically fully curry functions called with too few arguments:

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