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----
-title: function*
-slug: Web/JavaScript/Reference/Statements/function*
-translation_of: Web/JavaScript/Reference/Statements/function*
----
-<div dir="rtl">{{jsSidebar("Statements")}}</div>
-
-<p>The <code><strong>function*</strong></code> declaration (<code>function</code> keyword followed by an asterisk) defines a <em>generator function</em>, which returns a {{jsxref("Global_Objects/Generator","Generator")}} object.</p>
-
-<div>{{EmbedInteractiveExample("pages/js/statement-functionasterisk.html")}}</div>
-
-
-
-<p>You can also define generator functions using the {{jsxref("GeneratorFunction")}} constructor, or the function expression syntax.</p>
-
-<h2 id="Syntax">Syntax</h2>
-
-<pre class="syntaxbox notranslate">function* <var>name</var>([<var>param</var>[, <var>param</var>[, ... <var>param</var>]]]) {
-   <var>statements</var>
-}
-</pre>
-
-<dl>
- <dt><code><var>name</var></code></dt>
- <dd>The function name.</dd>
- <dt><code><var>param</var></code> {{optional_inline}}</dt>
- <dd>The name of a formal parameter for the function.</dd>
- <dt><code><var>statements</var></code></dt>
- <dd>The statements comprising the body of the function.</dd>
-</dl>
-
-<h2 id="Description">Description</h2>
-
-<p>Generators are functions that can be exited and later re-entered. Their context (variable bindings) will be saved across re-entrances.</p>
-
-<p>Generators in JavaScript -- especially when combined with Promises -- are a very powerful tool for asynchronous programming as they mitigate -- if not entirely eliminate -- the problems with callbacks, such as <a href="http://callbackhell.com/">Callback Hell</a> and <a href="https://frontendmasters.com/courses/rethinking-async-js/callback-problems-inversion-of-control/">Inversion of Control</a>. However, an even simpler solution to these problems can be achieved with {{jsxref("Statements/async_function", "async functions")}}.</p>
-
-<p>Calling a generator function does not execute its body immediately; an <a href="/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#iterator">iterator</a> object for the function is returned instead. When the iterator's <code>next()</code> method is called, the generator function's body is executed until the first {{jsxref("Operators/yield", "yield")}} expression, which specifies the value to be returned from the iterator or, with {{jsxref("Operators/yield*", "yield*")}}, delegates to another generator function. The <code>next()</code> method returns an object with a <code>value</code> property containing the yielded value and a <code>done</code> property which indicates whether the generator has yielded its last value, as a boolean. Calling the <code>next()</code> method with an argument will resume the generator function execution, replacing the <code>yield</code> expression where an execution was paused with the argument from <code>next()</code>.</p>
-
-<p>A <code>return</code> statement in a generator, when executed, will make the generator finish (i.e. the <code>done</code> property of the object returned by it will be set to <code>true</code>). If a value is returned, it will be set as the <code>value</code> property of the object returned by the generator.<br>
- Much like a <code>return</code> statement, an error is thrown inside the generator will make the generator finished -- unless caught within the generator's body.<br>
- When a generator is finished, subsequent <code>next()</code> calls will not execute any of that generator's code, they will just return an object of this form: <code>{value: undefined, done: true}</code>.</p>
-
-<h2 id="Examples">Examples</h2>
-
-<h3 id="Simple_example">Simple example</h3>
-
-<pre class="brush: js notranslate">function* idMaker() {
-  var index = 0;
-  while (true)
-    yield index++;
-}
-
-var gen = idMaker();
-
-console.log(gen.next().value); // 0
-console.log(gen.next().value); // 1
-console.log(gen.next().value); // 2
-console.log(gen.next().value); // 3
-// ...</pre>
-
-<h3 id="Example_with_yield*">Example with yield*</h3>
-
-<pre class="brush: js notranslate">function* anotherGenerator(i) {
-  yield i + 1;
-  yield i + 2;
-  yield i + 3;
-}
-
-function* generator(i) {
-  yield i;
-  yield* anotherGenerator(i);
-  yield i + 10;
-}
-
-var gen = generator(10);
-
-console.log(gen.next().value); // 10
-console.log(gen.next().value); // 11
-console.log(gen.next().value); // 12
-console.log(gen.next().value); // 13
-console.log(gen.next().value); // 20
-</pre>
-
-<h3 id="Passing_arguments_into_Generators">Passing arguments into Generators</h3>
-
-<pre class="brush: js notranslate">function* logGenerator() {
-  console.log(0);
-  console.log(1, yield);
-  console.log(2, yield);
-  console.log(3, yield);
-}
-
-var gen = logGenerator();
-
-// the first call of next executes from the start of the function
-// until the first yield statement
-gen.next();             // 0
-gen.next('pretzel');    // 1 pretzel
-gen.next('california'); // 2 california
-gen.next('mayonnaise'); // 3 mayonnaise
-</pre>
-
-<h3 id="Return_statement_in_a_generator">Return statement in a generator</h3>
-
-<pre class="brush: js notranslate">function* yieldAndReturn() {
-  yield "Y";
-  return "R";
-  yield "unreachable";
-}
-
-var gen = yieldAndReturn()
-console.log(gen.next()); // { value: "Y", done: false }
-console.log(gen.next()); // { value: "R", done: true }
-console.log(gen.next()); // { value: undefined, done: true }
-</pre>
-
-<h3 id="Generator_as_an_object_property">Generator as an object property</h3>
-
-<pre class="brush: js notranslate">const someObj = {
-  *generator () {
-    yield 'a';
-    yield 'b';
-  }
-}
-
-const gen = someObj.generator()
-
-console.log(gen.next()); // { value: 'a', done: false }
-console.log(gen.next()); // { value: 'b', done: false }
-console.log(gen.next()); // { value: undefined, done: true }
-</pre>
-
-<h3 id="Generator_as_an_object_method">Generator as an object method</h3>
-
-<pre class="brush: js notranslate">class Foo {
-  *generator () {
-    yield 1;
-    yield 2;
-    yield 3;
-  }
-}
-
-const f = new Foo ();
-const gen = f.generator();
-
-console.log(gen.next()); // { value: 1, done: false }
-console.log(gen.next()); // { value: 2, done: false }
-console.log(gen.next()); // { value: 3, done: false }
-console.log(gen.next()); // { value: undefined, done: true }
-</pre>
-
-<h3 id="Generator_as_a_computed_property">Generator as a computed property</h3>
-
-<pre class="brush: js notranslate">class Foo {
-  *[Symbol.iterator] () {
-    yield 1;
-    yield 2;
-  }
-}
-
-const SomeObj = {
-  *[Symbol.iterator] () {
-    yield 'a';
-    yield 'b';
-  }
-}
-
-console.log(Array.from(new Foo)); // [ 1, 2 ]
-console.log(Array.from(SomeObj)); // [ 'a', 'b' ]
-</pre>
-
-<h3 id="Generators_are_not_constructable">Generators are not constructable</h3>
-
-<pre class="brush: js notranslate">function* f() {}
-var obj = new f; // throws "TypeError: f is not a constructor
-</pre>
-
-<h3 id="Generator_defined_in_an_expression">Generator defined in an expression</h3>
-
-<pre class="brush: js notranslate">const foo = function* () {
-  yield 10;
-  yield 20;
-};
-
-const bar = foo();
-console.log(bar.next()); // {value: 10, done: false}</pre>
-
-<h3 id="Generator_example">Generator example</h3>
-
-<pre class="syntaxbox notranslate">function* powers(n){
-     //endless loop to generate
-     for(let current =n;; current *= n){
-         yield current;
-     }
-}
-
-for(let power of powers(2)){
-     //controlling generator
-     if(power &gt; 32) break;
-     console.log(power)
-           //2
-          //4
-         //8
-        //16
-       //32
-}</pre>
-
-<h2 id="Specifications">Specifications</h2>
-
-<table class="standard-table">
- <thead>
-  <tr>
-   <th scope="col">Specification</th>
-  </tr>
- </thead>
- <tbody>
-  <tr>
-   <td>{{SpecName('ESDraft', '#sec-generator-function-definitions', 'function*')}}</td>
-  </tr>
- </tbody>
-</table>
-
-<h2 id="Browser_compatibility">Browser compatibility</h2>
-
-<div>
-
-
-<p>{{Compat("javascript.statements.generator_function")}}</p>
-</div>
-
-<h2 id="See_also">See also</h2>
-
-<ul>
- <li>{{jsxref("Operators/function*", "function* expression")}}</li>
- <li>{{jsxref("GeneratorFunction")}} object</li>
- <li><a href="/en-US/docs/Web/JavaScript/Reference/Iteration_protocols">Iteration protocols</a></li>
- <li>{{jsxref("Operators/yield", "yield")}}</li>
- <li>{{jsxref("Operators/yield*", "yield*")}}</li>
- <li>{{jsxref("Function")}} object</li>
- <li>{{jsxref("Statements/function", "function declaration")}}</li>
- <li>{{jsxref("Operators/function", "function expression")}}</li>
- <li>{{jsxref("Functions_and_function_scope", "Functions and function scope")}}</li>
- <li>Other web resources:
-  <ul>
-   <li><a href="http://facebook.github.io/regenerator/">Regenerator</a> an ES2015 generator compiler to ES5</li>
-   <li><a href="http://www.youtube.com/watch?v=qbKWsbJ76-s">Forbes Lindesay: Promises and Generators: control flow utopia -- JSConf EU 2013</a></li>
-   <li><a href="https://github.com/mozilla/task.js">Task.js</a></li>
-   <li><a href="https://github.com/getify/You-Dont-Know-JS/blob/1st-ed/async%20%26%20performance/ch4.md#iterating-generators-asynchronously">Iterating generators asynchronously</a></li>
-  </ul>
- </li>
-</ul>