init reader for lists

list/list.go

@@ -29,6 +29,9 @@ func (this *List) Conj(val any) *List {
 }
 
 func Conj(this *List, val any) *List {
+	if this == nil {
+		return New(val)
+	}
 	new_head := New(val)
 	new_head.next = this
 	return new_head
@@ -46,6 +49,9 @@ func (this *List) Rest() *List {
 }
 
 func First(this *List) any {
+	if this == nil {
+		return nil
+	}
 	return this.Value
 }
 
@@ -53,6 +59,10 @@ func (this *List) First() any {
 	return First(this)
 }
 
+func IsEmpty(this *List) bool {
+	return this == nil
+}
+
 func String(this *List) string {
 	if this == nil {
 		return "{}"