Async generator examples

live-examples/js-examples/expressions/expressions-async-function-asterisk.js

@@ -0,0 +1,17 @@
+async function* foo() {
+  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/expressions/meta.json

@@ -1,23 +1,29 @@
 {
     "pages": {
-      "expressionsAddition": {
+        "expressionsAddition": {
           "exampleCode": "./live-examples/js-examples/expressions/expressions-addition.js",
           "fileName": "expressions-addition.html",
           "title": "JavaScript Demo: Expressions - Addition operator",
           "type": "js"
-      },
-      "expressionsAdditionAssignment": {
-        "exampleCode": "./live-examples/js-examples/expressions/expressions-addition-assignment.js",
-        "fileName": "expressions-addition-assignment.html",
-        "title": "JavaScript Demo: Expressions - Addition assignment operator",
-        "type": "js"
-      },
-      "expressionsAssignment": {
+        },
+        "expressionsAdditionAssignment": {
+            "exampleCode": "./live-examples/js-examples/expressions/expressions-addition-assignment.js",
+            "fileName": "expressions-addition-assignment.html",
+            "title": "JavaScript Demo: Expressions - Addition assignment operator",
+            "type": "js"
+        },
+        "expressionsAssignment": {
             "exampleCode": "./live-examples/js-examples/expressions/expressions-assignment.js",
             "fileName": "expressions-assignment.html",
             "title": "JavaScript Demo: Expressions - Assignment",
             "type": "js"
         },
+        "expressionsAsyncFunctionAsterisk": {
+            "exampleCode": "./live-examples/js-examples/expressions/expressions-async-function-asterisk.js",
+            "fileName": "expressions-async-function-asterisk.html",
+            "title": "JavaScript Demo: Expressions - Async Function Asterisk",
+            "type": "js"
+        },
         "expressionsBitwiseAND": {
             "exampleCode": "./live-examples/js-examples/expressions/expressions-bitwise-and.js",
             "fileName": "expressions-bitwise-and.html",

live-examples/js-examples/statement/statement-async-function-asterisk.js

@@ -1,19 +1,19 @@
-async function* randomNumbers() {
-  const url = 'https://www.random.org/decimal-fractions/?num=1&dec=10&col=1&format=plain&rnd=new';
-
-  console.log('Print randomly generated numbers until reset is clicked, or the random number exceeds 0.95');
-  while (true) {
-    const response = await fetch(url);
-    const text = await response.text();
-    yield Number(text);
-  }
+async function* asyncGenerator() {
+  yield await Promise.resolve(1);
+  yield await Promise.resolve(2);
+  yield await Promise.resolve(3);
 }
 
-async function printRandoms() {
-  for await (const number of randomNumbers()) {
-    console.log(number);
-    if (number > 0.95) { break; }
-  }
-}
+const asyncGen = asyncGenerator();
+
+asyncGen.next()
+  .then(res => console.log(res.value));
+// expected output: 1
+
+asyncGen.next()
+  .then(res => console.log(res.value));
+// expected output: 2
 
-printRandoms();
+asyncGen.next()
+  .then(res => console.log(res.value));
+// expected output: 3