update

1-js/4-data-structures/9-arguments-pseudoarray/2-sum-arguments/solution.md

@@ -0,0 +1,21 @@
+
+
+```js
+//+ run
+function sum() {
+  var result = 0;
+
+  for(var i=0; i<arguments.length; i++) {
+    result += arguments[i];
+  }
+
+  return result;
+}
+
+alert( sum() ); // 0
+alert( sum(1) ); // 1
+alert( sum(1, 2) ); // 3
+alert( sum(1, 2, 3) ); // 6
+alert( sum(1, 2, 3, 4) ); // 10
+```
+