Function currying is a concept that decomposes a function with multiple parameters into multiple functions with a single parameter, so that the output is the same. In other words, it is a technique that simplifies a multi-value parameter function into a single-value parameter multi-function function.
Currying is a functional programming technique that transforms a function that takes multiple arguments into a series of functions that each take a single argument. Currying is a way to simplify complex functions and create more flexible code. In Java, currying can be achieved through the use of lambda expressions.
Here's an example of a curried function in Java:
Function<Integer, Function<Integer, Integer>> add = x -> y -> x + y;
This function takes an integer argument x
and returns another function that takes an integer argument y
and returns the sum of x
and y
. This function can be called in two ways:
add.apply(2).apply(3); // returns 5
or
Function<Integer, Integer> add2 = add.apply(2); add2.apply(3); // returns 5
In the first example, we call add
with the argument 2
, which returns a new function that takes an integer argument y
. We then call that function with the argument 3
, which returns the result 5
.
In the second example, we use partial application to create a new function add2
that takes a single argument y
and adds it to 2
. We then call add2
with the argument 3
, which also returns the result 5
.
Currying allows for more flexible code, as functions can be partially applied and composed to create new functions. It is a powerful technique for simplifying complex functions and creating more reusable code.