Slice: Add none func (#13)

Returns true whether no elements of this slice match the provided predicate
func. Negated form of Every func

slice/slice.go

@@ -121,6 +121,28 @@ func Every(slice, function interface{}) bool {
 	return currentLength == sv.Len()
 }
 
+// None return true if all the values in the slice mismatch the criteria
+// The function signature should be func(index int, value interface{}) bool .
+func None(slice, function interface{}) bool {
+	sv := sliceValue(slice)
+	fn := functionValue(function)
+
+	elemType := sv.Type().Elem()
+	if checkSliceCallbackFuncSignature(fn, elemType, reflect.ValueOf(true).Type()) {
+		panic("function param should be of type func(int, " + elemType.String() + ")" + reflect.ValueOf(true).Type().String())
+	}
+
+	var currentLength int
+	for i := 0; i < sv.Len(); i++ {
+		flag := fn.Call([]reflect.Value{reflect.ValueOf(i), sv.Index(i)})[0]
+		if !flag.Bool() {
+			currentLength++
+		}
+	}
+
+	return currentLength == sv.Len()
+}
+
 // Some return true if any of the values in the list pass the predicate function.
 // The function signature should be func(index int, value interface{}) bool .
 func Some(slice, function interface{}) bool {

slice/slice_test.go

@@ -108,6 +108,18 @@ func TestEvery(t *testing.T) {
 	}
 }
 
+func TestNone(t *testing.T) {
+	nums := []int{1, 2, 3, 5}
+	check := func(i, num int) bool {
+		return num%2 == 1
+	}
+	res := None(nums, check)
+	if res != false {
+		internal.LogFailedTestInfo(t, "Every", nums, false, res)
+		t.FailNow()
+	}
+}
+
 func TestSome(t *testing.T) {
 	nums := []int{1, 2, 3, 5}
 	isEven := func(i, num int) bool {