4.6 Hello World

Add one last built-in function: puts.
puts prints the given arguments on new lines to STDOUT.

evaluator/builtins.go

@@ -1,6 +1,8 @@
 package evaluator
 
 import (
+	"fmt"
+
 	"github.com/cedrickchee/hou/object"
 )
 
@@ -109,4 +111,12 @@ var builtins = map[string]*object.Builtin{
 			return &object.Array{Elements: newElements}
 		},
 	},
+	"puts": &object.Builtin{
+		Fn: func(args ...object.Object) object.Object {
+			for _, arg := range args {
+				fmt.Println(arg.Inspect())
+			}
+			return NULL
+		},
+	},
 }