feat(docs): adding learn by for Wing

example_versioned_docs/version-latest/10-structs.md

@@ -0,0 +1,47 @@
+---
+title: Structs
+id: structs
+slug: /structs
+sidebar_label: 10. Structs
+description: Using arrays with Wing
+keywords: [Wing language, example]
+---
+
+Structs are loosely modeled after typed JSON literals in JavaScript.
+
+```js playground example title="main.w"
+let main = () => {
+
+  let a = MutArray<num>[1, 2, 3];
+
+  log("{a[0]}, {a[1]}, {a[2]}");
+
+  a[2] = 4;
+
+  log("mutated value: {a[2]}");
+  log("len: {a.length}");
+
+  let data = MutArray<num>[1, 2, 3];
+  let twoD = MutArray<MutArray<num>>[data];
+
+  for array in twoD {
+    for item in array {
+      log(item * 10);
+    }
+  } 
+
+}
+
+```
+
+```bash title="Wing console output"
+# Run locally with wing console
+wing it
+
+1, 2, 3
+mutated value: 4
+len: 3
+10
+20
+30
+```