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## countif
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### Instructions
Write a function `CountIf` that returns the number of elements of a `string` slice for which the `f` function returns `true`.
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### Expected function
```go
func CountIf(f func(string) bool, tab []string) int {
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}
```
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### Usage
Here is a possible program to test your function :
```go
package main
import (
"fmt"
"piscine"
)
func main() {
tab1 := []string{"Hello", "how", "are", "you"}
tab2 := []string{"This","1", "is", "4", "you"}
answer1 := piscine.CountIf(piscine.IsNumeric, tab1)
answer2 := piscine.CountIf(piscine.IsNumeric, tab2)
fmt.Println(answer1)
fmt.Println(answer2)
}
```
And its output :
```console
$ go run .
0
2
$
```
### 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)