fixed typo and cleaner helper

filter.go

@@ -180,7 +180,7 @@ func (q *Query) GenericFilter(i interface{}) interface{} {
 }
 
 // Filter takes a pointer to the Filter interface as an argument.
-// The original slice is modified is the filtering process.
+// The original slice is modified in the filtering process.
 func (q Query) Filter(f Filter) {
 	count := 0
 	i := 0

helper.go

@@ -59,28 +59,34 @@ func matchFunc(v string) func(string) bool {
 		return false
 	}
 }
-func boolFunc(v string) func(bool) bool {
-	f := func(b bool) bool {
-		return false
+
+func ft(b bool) bool {
+	if b {
+		return true
 	}
+	return false
+}
+
+func ff(b bool) bool {
+	if !b {
+		return true
+	}
+	return false
+}
+
+func f(b bool) bool {
+	return false
+}
+
+func boolFunc(v string) func(bool) bool {
 	if len(v) == 0 {
 		return f
 	}
 	if v[0] == 't' {
-		return func(b bool) bool {
-			if b {
-				return true
-			}
-			return false
-		}
+		return ft
 	}
 	if v[0] == 'f' {
-		return func(b bool) bool {
-			if !b {
-				return true
-			}
-			return false
-		}
+		return ff
 	}
 	return f
 }