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## foreach
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### Instructions
Write a function `ForEach` that, for an `int` slice, applies a function on each elements of that slice.
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### Expected function
```go
func ForEach(f func(int), a []int) {
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}
```
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### Usage
Here is a possible program to test your function :
```go
package main
import "piscine"
func main() {
a := []int{1, 2, 3, 4, 5, 6}
piscine.ForEach(piscine.PrintNbr, a)
}
```
And its output :
```console
$ go run .
123456
$
```
### Notions
- [Function literals](https://golang.org/ref/spec#Function_literals)
- [Function declaration](https://golang.org/ref/spec#Function_declarations)
- [Function types](https://golang.org/ref/spec#Function_types)