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## issorted
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### Instructions
Write a function `IsSorted` that returns `true` if the slice of `int` is sorted, and that returns `false` otherwise.
The function passed in parameter returns a positive `int` if `a` (the first argument) is superior to `b` (the second argument), it returns `0` if they are equal and it returns a negative `int` otherwise.
To do your testing you have to write your own `f` function.
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### Expected function
```go
func IsSorted(f func(a, b int) int, a []int) bool {
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}
```
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### Usage
Here is a possible program to test your function (without `f`):
```go
package main
import (
"fmt"
"piscine"
)
func main() {
a1 := []int{0, 1, 2, 3, 4, 5}
a2 := []int{0, 2, 1, 3}
result1 := piscine.IsSorted(f, a1)
result2 := piscine.IsSorted(f, a2)
fmt.Println(result1)
fmt.Println(result2)
}
```
And its output :
```console
$ go run .
true
false
$
```