Refactor to implement find method by class

class.go

@@ -0,0 +1,25 @@
+package mruby
+
+import "fmt"
+
+var methods = map[string]*Method{
+	"puts": {
+		Function: func(mrb *State, recv Value) Value {
+			args, ok := recv.([]Value)
+			if !ok {
+				return nil
+			}
+
+			fmt.Println(args...)
+			return args[0]
+		},
+	},
+}
+
+func findMethod(mrb *State, recv Value, mid string) *Method {
+	if m, ok := methods[mid]; ok {
+		return m
+	}
+
+	return nil
+}

irep.go

@@ -84,11 +84,14 @@ func (ir *iRep) Execute(state *State) (Value, error) {
 			b := ir.iSeq.ReadB()
 			c := ir.iSeq.ReadB()
 
-			funcName := ir.syms[b]
-			if funcName == "puts" {
+			recv := regs[0]
+			mid := ir.syms[b]
+			method := findMethod(state, recv, mid)
+
+			if method != nil {
 				argc := c & 0xf
-				fmt.Println(regs[a+1 : a+argc+1]...)
-				regs[a] = regs[a+1]
+				args := regs[a+1 : a+argc+1]
+				regs[a] = method.Function(state, args)
 				break
 			}
 

mruby.go

@@ -4,6 +4,12 @@ type (
 	Value = any
 )
 
+type Function func(*State, Value) Value
+
+type Method struct {
+	Function
+}
+
 type State struct {
 }