Filter
Filter looks through each value in the slice, returning a slice of all the values that pass a truth test (predicate).
package main
import (
"fmt"
u "github.com/rjNemo/underscore"
)
func main() {
nums := []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
isEven := func(n int) bool { return n%2 == 0 }
fmt.Println(u.Filter(nums, isEven)) // {0, 2, 4, 6, 8}
}