Merge pull request jashkenas#654 from FarSeeing/master

Simplify some isType methods declaration

underscore.js

@@ -826,33 +826,21 @@
     return obj === Object(obj);
   };
 
-  // Is a given variable an arguments object?
+  // Add some isType methods: isArguments, isFunction, isString, isNumber, isDate, isRegExp.
+  each(['Arguments', 'Function', 'String', 'Number', 'Date', 'RegExp'], function(name) {
+    _['is' + name] = function(obj) {
+      return toString.call(obj) == '[object ' + name + ']';
+    };
+  });
+
   // Define a fallback version of the method in browsers (ahem, IE), where
   // there isn't any inspectable "Arguments" type.
-  _.isArguments = function(obj) {
-    return toString.call(obj) == '[object Arguments]';
-  };
   if (!_.isArguments(arguments)) {
     _.isArguments = function(obj) {
       return !!(obj && _.has(obj, 'callee'));
     };
   }
 
-  // Is a given value a function?
-  _.isFunction = function(obj) {
-    return toString.call(obj) == '[object Function]';
-  };
-
-  // Is a given value a string?
-  _.isString = function(obj) {
-    return toString.call(obj) == '[object String]';
-  };
-
-  // Is a given value a number?
-  _.isNumber = function(obj) {
-    return toString.call(obj) == '[object Number]';
-  };
-
   // Is a given object a finite number?
   _.isFinite = function(obj) {
     return _.isNumber(obj) && isFinite(obj);
@@ -869,16 +857,6 @@
     return obj === true || obj === false || toString.call(obj) == '[object Boolean]';
   };
 
-  // Is a given value a date?
-  _.isDate = function(obj) {
-    return toString.call(obj) == '[object Date]';
-  };
-
-  // Is the given value a regular expression?
-  _.isRegExp = function(obj) {
-    return toString.call(obj) == '[object RegExp]';
-  };
-
   // Is a given value equal to null?
   _.isNull = function(obj) {
     return obj === null;