concat (string)

valuescript_vm/src/string_methods.rs

@@ -47,6 +47,7 @@ pub fn get_string_method(method: &str) -> Val {
     // "charCodeAt" => Val::Static(&CHAR_CODE_AT),
     //
     "codePointAt" => Val::Static(&CODE_POINT_AT),
+    "concat" => Val::Static(&CONCAT),
     _ => Val::Undefined,
   }
 }
@@ -96,6 +97,23 @@ static CODE_POINT_AT: NativeFunction = NativeFunction {
   },
 };
 
+static CONCAT: NativeFunction = NativeFunction {
+  fn_: |this: &mut Val, params: Vec<Val>| -> Val {
+    match this {
+      Val::String(string_data) => {
+        let mut result = string_data.as_str().to_string();
+
+        for param in params {
+          result.push_str(param.val_to_string().as_str());
+        }
+
+        Val::String(Rc::new(result))
+      }
+      _ => std::panic!("Not implemented: exceptions/string indirection"),
+    }
+  },
+};
+
 fn unicode_at(bytes: &[u8], index: usize) -> Option<String> {
   match code_point_at(bytes, index) {
     Some(code_point) => Some(