Simplified Evaluate function

src/token/Kind.go

@@ -33,7 +33,7 @@ const (
 	LogicalAnd                        // &&
 	LogicalOr                         // ||
 	Define                            // :=
-	Period                            // .
+	Dot                               // .
 	Range                             // ..
 	Call                              // x()
 	Array                             // [x]

src/token/Tokenize_test.go

@@ -216,14 +216,14 @@ func TestDefine(t *testing.T) {
 	}
 }
 
-func TestPeriod(t *testing.T) {
+func TestDot(t *testing.T) {
 	tokens := token.Tokenize([]byte(`a.b.c`))
 
 	expected := []token.Kind{
 		token.Identifier,
-		token.Period,
+		token.Dot,
 		token.Identifier,
-		token.Period,
+		token.Dot,
 		token.Identifier,
 		token.EOF,
 	}

src/token/operator.go

@@ -35,7 +35,7 @@ func operator(tokens List, buffer []byte, i Position) (List, Position) {
 	case "+=":
 		kind = AddAssign
 	case ".":
-		kind = Period
+		kind = Dot
 	case "..":
 		kind = Range
 	case ":=":