Add JS GeneratorFunction examples (#2341)

* JS GeneratorFunction examples

* Lint fixes

* Update live-examples/js-examples/functionasterisk/async-functionasterisk-function.js

Co-authored-by: Joshua Chen <sidachen2003@gmail.com>

Co-authored-by: Joshua Chen <sidachen2003@gmail.com>

live-examples/js-examples/functionasterisk/async-functionasterisk-function.js

@@ -0,0 +1,19 @@
+const AsyncGeneratorFunction = async function* () {}.constructor;
+
+const foo = new AsyncGeneratorFunction(`
+  yield await Promise.resolve('a');
+  yield await Promise.resolve('b');
+  yield await Promise.resolve('c');
+`);
+
+let str = '';
+
+async function generate() {
+  for await (const val of foo()) {
+    str = str + val;
+  }
+  console.log(str);
+}
+
+generate();
+// expected output: "abc"

live-examples/js-examples/functionasterisk/functionasterisk-function.js

@@ -0,0 +1,15 @@
+const GeneratorFunction = function* () {}.constructor;
+
+const foo = new GeneratorFunction(`
+  yield 'a';
+  yield 'b';
+  yield 'c';
+`);
+
+let str = '';
+for (const val of foo()) {
+  str = str + val;
+}
+
+console.log(str);
+// expected output: "abc"

live-examples/js-examples/functionasterisk/meta.json

@@ -0,0 +1,16 @@
+{
+    "pages": {
+        "asyncFunctionAsteriskFunction": {
+            "exampleCode": "./live-examples/js-examples/functionasterisk/async-functionasterisk-function.js",
+            "fileName": "async-functionasterisk-function.html",
+            "title": "JavaScript Demo: AsyncGeneratorFunction()",
+            "type": "js"
+        },
+        "functionAsteriskFunction": {
+            "exampleCode": "./live-examples/js-examples/functionasterisk/functionasterisk-function.js",
+            "fileName": "functionasterisk-function.html",
+            "title": "JavaScript Demo: GeneratorFunction()",
+            "type": "js"
+        }
+    }
+}