Underscore 0.4.4, with isNumber, isString, and isEqual(NaN, NaN)

index.html

@@ -107,11 +107,11 @@
     <p>
       <table>
         <tr>
-          <td><a href="underscore.js">Development Version (0.4.3)</a></td>
+          <td><a href="underscore.js">Development Version (0.4.4)</a></td>
           <td><i>18kb, Uncompressed with Comments</i></td>
         </tr>
         <tr>
-          <td><a href="underscore-min.js">Production Version (0.4.3)</a></td>
+          <td><a href="underscore-min.js">Production Version (0.4.4)</a></td>
           <td><i>2kb, Packed and Gzipped</i></td>
         </tr>
       </table>
@@ -202,7 +202,8 @@ _(lyrics).chain()
       <span class="methods"><a href="#keys">keys</a>, <a href="#values">values</a>,
       <a href="#extend">extend</a>, <a href="#clone">clone</a>,
       <a href="#isEqual">isEqual</a>, <a href="#isEmpty">isEmpty</a>, <a href="#isElement">isElement</a>,
-      <a href="#isArray">isArray</a>, <a href="#isFunction">isFunction</a>, <a href="#isUndefined">isUndefined</a>
+      <a href="#isArray">isArray</a>, <a href="#isFunction">isFunction</a>, <a href="#isString">isString</a>,
+      <a href="#isNumber">isNumber</a>, <a href="#isUndefined">isUndefined</a>
       </span>
     </p>
 
@@ -763,6 +764,26 @@ _.isArray([1,2,3]);
       <pre>
 _.isFunction(alert);
 =&gt; true
+</pre>
+
+      <p id="isString">
+        <b class="header">isString</b><code>_.isString(object)</code>
+        <br />
+        Returns <i>true</i> if <b>object</b> is a String.
+      </p>
+      <pre>
+_.isFunction("moe");
+=&gt; true
+</pre>
+
+      <p id="isNumber">
+        <b class="header">isNumber</b><code>_.isNumber(object)</code>
+        <br />
+        Returns <i>true</i> if <b>object</b> is a Number.
+      </p>
+      <pre>
+_.isNumber(8.4 * 5);
+=&gt; true
 </pre>
 
       <p id="isUndefined">
@@ -891,6 +912,12 @@ _([1, 2, 3]).value();
 
       <h2>Change Log</h2>
       
+      <p>
+        <b class="header">0.4.4</b><br />
+        Added <tt>isString</tt>, and <tt>isNumber</tt>, for consistency. Fixed
+        <tt>_.isEqual(NaN, NaN)</tt> to return <i>true</i> (which is debatable). 
+      </p>
+      
       <p>
         <b class="header">0.4.3</b><br />
         Started using the native StopIteration object in browsers that support it.

test/objects.js

@@ -34,6 +34,8 @@ $(document).ready(function() {
     ok(moe != clone, 'basic equality between objects is false');
     ok(_.isEqual(moe, clone), 'deep equality is true');
     ok(_(moe).isEqual(clone), 'OO-style deep equality works');
+    ok(!_.isEqual(5, NaN), '5 is not equal to NaN');
+    ok(_.isEqual(NaN, NaN), 'NaN is equal to NaN');
   });
 
   test("objects: isEmpty", function() {
@@ -57,6 +59,16 @@ $(document).ready(function() {
     ok(_.isArray([1, 2, 3]), 'but arrays are');
   });
 
+  test("objects: isString", function() {
+    ok(!_.isString(document.body), 'the document body is not a string');
+    ok(_.isString([1, 2, 3].join(', ')), 'but strings are');
+  });
+
+  test("objects: isNumber", function() {
+    ok(!_.isNumber(arguments), 'the arguments object is not a number');
+    ok(_.isNumber(3 * 4 - 7 / 10), 'but numbers are');
+  });
+
   test("objects: isFunction", function() {
     ok(!_.isFunction([1, 2, 3]), 'arrays are not functions');
     ok(!_.isFunction('moe'), 'strings are not functions');

test/utility.js

@@ -35,7 +35,7 @@ $(document).ready(function() {
     "defer", "delay", "detect", "each", "every", "extend", "filter", "first",
     "flatten", "foldl", "foldr", "forEach", "functions", "identity", "include",
     "indexOf", "inject", "intersect", "invoke", "isArray", "isElement", "isEmpty", "isEqual",
-    "isFunction", "isUndefined", "keys", "last", "lastIndexOf", "map", "max", 
+    "isFunction", "isNumber", "isString", "isUndefined", "keys", "last", "lastIndexOf", "map", "max",
     "methods", "min", "pluck", "reduce", "reduceRight", "reject", "select",
     "size", "some", "sortBy", "sortedIndex", "template", "toArray", "uniq",
     "uniqueId", "values", "without", "wrap", "zip"];

underscore.js

@@ -31,7 +31,7 @@
   if (typeof exports !== 'undefined') exports._ = _;
 
   // Current version.
-  _.VERSION = '0.4.3';
+  _.VERSION = '0.4.4';
 
   /*------------------------ Collection Functions: ---------------------------*/
 
@@ -399,6 +399,8 @@
     if (a == b) return true;
     // One of them implements an isEqual()?
     if (a.isEqual) return a.isEqual(b);
+    // Both are NaN?
+    if (_.isNumber(a) && _.isNumber(b) && isNaN(a) && isNaN(b)) return true;
     // If a is not an object by this point, we can't handle it.
     if (atype !== 'object') return false;
     // Nothing else worked, deep compare the contents.
@@ -430,6 +432,16 @@
     return Object.prototype.toString.call(obj) == '[object Function]';
   };
 
+  // Is a given value a String?
+  _.isString = function(obj) {
+    return Object.prototype.toString.call(obj) == '[object String]';
+  };
+
+  // Is a given value a Number?
+  _.isNumber = function(obj) {
+    return Object.prototype.toString.call(obj) == '[object Number]';
+  };
+
   // Is a given variable undefined?
   _.isUndefined = function(obj) {
     return typeof obj == 'undefined';