public/subjects/reduceint.en.md

## reduceint

## **WARNING! VERY IMPORTANT!**

For this exercise a function will be tested **with the exam own main**. However the student **still needs** to submit a structured program:

This means that:

- The package needs to be named `package main`.
- The submitted code needs one declared function main(`func main()`) even if empty.
- The function main declared needs to **also pass** the `Restrictions Checker`(illegal functions tester). It is advised for the student to just empty the function main after its own testings are done.
- Every other rules are obviously the same than for a `program`.

### Instructions

Write a function called `reduceint` that simulates the behaviour of reduce from JavaScript.

The function should have as parameters a function, `f func(int, int) int` and a slice of integers, `arr []int`. You should apply for each element of the slice the arithmetic function, saving it and printing.

### Expected function

```go
func ReduceInt(f func(int, int) int, arr []int) {

}
```

### Usage

Here is a possible program to test your function :

```go
package main

func main() {
	mul := func(acc int, cur int) int {
		return acc * cur
	}
	sum := func(acc int, cur int) int {
		return acc + cur
	}
	div := func(acc int, cur int) int {
		return acc / cur
	}
	as := []int{500, 2}
	ReduceInt(mul, as)
	ReduceInt(sum, as)
	ReduceInt(div, as)
}

```

And its output :

```console
student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./test
1000
502
250
student@ubuntu:~/[[ROOT]]/test$
```