Website changes for 'const'

website/guide/custombehavior.html

@@ -22,6 +22,12 @@ use invalid UTF-8 (<code>0xFF</code> prefix byte).</p>
 <p>The <a href="#use-duk-notail">"use duk notail"</a> directive is non-standard.
 It prevents a function from being tail called.</p>
 
+<h2>"const" treated mostly like "var"</h2>
+
+<p>The <code>const</code> keyword is supported with minimal non-standard
+semantics (officially defined in Ecmascript 6).  See
+<a href="#es6-const">Const variables</a> for more detail.</p>
+
 <h2>The global require() function for module loading</h2>
 
 <p>The <code>require()</code> built-in is non-standard, and provided for

website/guide/es6features.html

@@ -5,6 +5,23 @@
 These features are not fully compliant; the intent is to minimize custom features
 and to align with the ES6 specification when possible.</p>
 
+<h2 id="es6-const">Const variables</h2>
+
+<p>Duktape has minimal support for
+<a href="http://www.ecma-international.org/ecma-262/6.0/#sec-let-and-const-declarations">const</a>
+declarations to allow existing code using <code>const</code> to run.  However,
+<code>const</code> is mostly just an alias for <code>var</code> and currently has
+the following non-standard semantics:</p>
+<ul>
+<li>Unlike <code>var</code> declarations, <code>const</code> declarations are
+    required to have an initializer.</li>
+<li>Const variables are writable.  In ES6 <code>const</code> variables are
+    not writable.</li>
+<li>Const variables are function scoped and "hoisted" to the top of the
+    function like <code>var</code> declarations.  In ES6 <code>const</code>
+    has block scoping like <code>let</code>.
+</ul>
+
 <h2 id="es6-proto">Object.setPrototypeOf and Object.prototype.__proto__</h2>
 
 <p><a href="http://www.ecma-international.org/ecma-262/6.0/index.html#sec-object.setprototypeof">Object.setPrototypeOf</a>

website/guide/intro.html

@@ -67,8 +67,8 @@ features (some are visible to applications, while others are internal):</p>
 <ul>
 <li>Khronos/ES6 <a href="https://www.khronos.org/registry/typedarray/specs/latest/">TypedArray</a>
     and <a href="https://nodejs.org/docs/v0.12.1/api/buffer.html">Node.js Buffer</a> bindings</li>
-<li>Borrowed from ES6: <code>setPrototypeOf</code>/<code>__proto__</code>
+<li>Borrowed from ES6: <code>setPrototypeOf</code>/<code>__proto__</code>,
-    and a subset of <code>Proxy</code> objects</li>
+    a subset of <code>Proxy</code> objects, and minimal <code>const</code> support</li>
 <li>Borrowed from browsers: <code>print()</code> and <code>alert()</code></li>
 <li>Duktape specific built-ins: provided by the <code>Duktape</code> global object</li>
 <li>Extended types: custom "buffer" and "pointer" types, extended string type