JS Prototype error "Prototype is not defined"
<p>I am new to JS, I write below code, but I got the error "Prototype is not defined".</p>

<pre><code>var proto = {
    describe: function () {
        return 'name: ' + this.name;
    }
};

var obj = {                
    [[Prototype]]: proto, //error in this line
    name:'obj'
};

console.log(proto.describe());
console.log(obj.describe());
</code></pre>