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    <p>I have spent a lot of time with <code>yield</code> recently, and bobince isn't completely wrong, but Chrome 31 does not interpret JavaScript version to 1.7 blocks, even with the Experimental JavaScript flag turned on (chrome://flags/#enable-javascript-harmony). Due to implementation differences between Chrome 31 and Firefox, Tymon Sturgeon's method is unable to detect <code>yield</code> in Chrome 31 with Experimental JS on, although it is very close. With a few modifications, it can detect the existence of <code>yield</code> for both Firefox and Chrome 31 with Experimental JS on.</p> <p>First I'll quickly cover the <code>yield</code> differences (writing it the long way for clarity):</p> <p>In Firefox:</p> <pre><code>var fooGen = function(){ yield 1; yield 2; }; var iterator = fooGen(); console.log(iterator.next()); // prints 1 console.log(iterator.next()); // prints 2 </code></pre> <p>In Chrome 31 with Experimental JavaScript enabled:</p> <pre><code>// Note the * var fooGen = function*(){ yield 1; yield 2; }; var iterator = fooGen(); console.log(iterator.next().value); // prints 1 console.log(iterator.next().value); // prints 2 </code></pre> <p><code>.value</code> is required in Chrome because it yields an object, but more importantly, the generator requires a "*" in the function definition. Also, I could not find a way to create a generator from the capital "F" Function: <code>new Function('', '{yield 5;}');</code> in Chrome. If you know how, leave a comment below.</p> <p>To properly detect <code>yield</code> in Firefox and Chrome, I have used a bit of code with some back and forth:</p> <pre><code>&lt;script type="application/javascript"&gt; var can_yield = (function(){ try { // Assuming Chrome's generator syntax var funcUsingYield = new Function('', '{ var interp = function* generator(){ yield true; }}'); return true; } catch(e) { return false; } })(); &lt;/script&gt; &lt;script type="application/javascript;version=1.7"&gt; // Redefine the `can_yield` function inside a JS1.7 block. Probably safe to simply return true can_yield = (function(){ try { return eval("!!Function('yield true;')().next()"); } catch(e) { return false; } })(); &lt;/script&gt; &lt;script type="application/javascript"&gt; if(!can_yield) { alert("Can't Yield!"); } &lt;/script&gt; </code></pre> <p>Tested in:</p> <ul> <li><strong>Firefox 25</strong>: <code>yield</code> works</li> <li><strong>Chrome 31</strong> with Experimental JS <strong>On</strong>: <code>yield</code> works</li> <li><strong>Chrome 31</strong> with Experimental JS <strong>Off</strong>: <code>yield</code> does not work</li> <li>and <strong>IE10</strong>: <code>yield</code> does not work</li> </ul>
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