Rename createBound to createWrapper and break createWrapper apart.

dist/lodash.underscore.js

@@ -476,6 +476,62 @@
     return bind(func, thisArg);
   }
 
+  /**
+   * The base implementation of `createWrapper` without `func` type checking
+   * or support for setting meta data.
+   *
+   * @private
+   * @param {Function|string} func The function or method name to reference.
+   * @param {number} bitmask The bitmask of method flags to compose.
+   * @param {Array} [partialArgs] An array of arguments to prepend to those
+   *  provided to the new function.
+   * @param {Array} [partialRightArgs] An array of arguments to append to those
+   *  provided to the new function.
+   * @param {*} [thisArg] The `this` binding of `func`.
+   * @param {number} [arity] The arity of `func`.
+   * @returns {Function} Returns the new function.
+   */
+  function baseCreateWrapper(func, bitmask, partialArgs, partialRightArgs, thisArg, arity) {
+    var isBind = bitmask & 1,
+        isBindKey = bitmask & 2,
+        isCurry = bitmask & 4,
+        isCurryBound = bitmask & 8,
+        isPartial = bitmask & 16,
+        isPartialRight = bitmask & 32,
+        key = func;
+
+    function bound() {
+      var thisBinding = isBind ? thisArg : this;
+      if (isCurry || isPartial || isPartialRight) {
+        if (isPartial) {
+          var args = partialArgs.slice();
+          push.apply(args, arguments);
+        }
+        if (isPartialRight || isCurry) {
+          args || (args = slice(arguments));
+          if (isPartialRight) {
+            push.apply(args, partialRightArgs);
+          }
+          if (isCurry && args.length < arity) {
+            bitmask |= 16 & ~32;
+            return createWrapper(func, (isCurryBound ? bitmask : bitmask & ~3), args, null, thisArg, arity);
+          }
+        }
+      }
+      args || (args = arguments);
+      if (isBindKey) {
+        func = thisBinding[key];
+      }
+      if (this instanceof bound) {
+        thisBinding = baseCreate(func.prototype);
+        var result = func.apply(thisBinding, args);
+        return isObject(result) ? result : thisBinding;
+      }
+      return func.apply(thisBinding, args);
+    }
+    return bound;
+  }
+
   /**
    * The base implementation of `_.flatten` without support for callback
    * shorthands or `thisArg` binding.
@@ -726,16 +782,15 @@
    *  provided to the new function.
    * @param {*} [thisArg] The `this` binding of `func`.
    * @param {number} [arity] The arity of `func`.
-   * @returns {Function} Returns the new bound function.
+   * @returns {Function} Returns the new function.
    */
-  function createBound(func, bitmask, partialArgs, partialRightArgs, thisArg, arity) {
+  function createWrapper(func, bitmask, partialArgs, partialRightArgs, thisArg, arity) {
     var isBind = bitmask & 1,
         isBindKey = bitmask & 2,
         isCurry = bitmask & 4,
         isCurryBound = bitmask & 8,
         isPartial = bitmask & 16,
-        isPartialRight = bitmask & 32,
-        key = func;
+        isPartialRight = bitmask & 32;
 
     if (!isBindKey && !isFunction(func)) {
       throw new TypeError;
@@ -749,41 +804,11 @@
       isPartialRight = partialRightArgs = false;
     }
     // fast path for `_.bind`
-    if (bitmask == 1 || bitmask === 17) {
-      var bound = baseBind(func, thisArg, partialArgs);
-    }
-    else {
-      bound = function() {
-        var thisBinding = isBind ? thisArg : this;
-        if (isCurry || isPartial || isPartialRight) {
-          if (isPartial) {
-            var args = partialArgs.slice();
-            push.apply(args, arguments);
-          }
-          if (isPartialRight || isCurry) {
-            args || (args = slice(arguments));
-            if (isPartialRight) {
-              push.apply(args, partialRightArgs);
-            }
-            if (isCurry && args.length < arity) {
-              bitmask |= 16 & ~32;
-              return createBound(func, (isCurryBound ? bitmask : bitmask & ~3), args, null, thisArg, arity);
-            }
-          }
-        }
-        args || (args = arguments);
-        if (isBindKey) {
-          func = thisBinding[key];
-        }
-        if (this instanceof bound) {
-          thisBinding = baseCreate(func.prototype);
-          var result = func.apply(thisBinding, args);
-          return isObject(result) ? result : thisBinding;
-        }
-        return func.apply(thisBinding, args);
-      };
-    }
-    return bound;
+    var result = (bitmask == 1 || bitmask === 17)
+      ? baseBind(func, thisArg, partialArgs)
+      : baseCreateWrapper(func, bitmask, partialArgs, partialRightArgs, thisArg, arity);
+
+    return result;
   }
 
   /**
@@ -3630,8 +3655,8 @@
    */
   function bind(func, thisArg) {
     return arguments.length > 2
-      ? createBound(func, 17, slice(arguments, 2), null, thisArg)
-      : createBound(func, 1, null, null, thisArg);
+      ? createWrapper(func, 17, slice(arguments, 2), null, thisArg)
+      : createWrapper(func, 1, null, null, thisArg);
   }
 
   /**
@@ -3665,7 +3690,7 @@
 
     while (++index < length) {
       var key = funcs[index];
-      object[key] = createBound(object[key], 1, null, null, object);
+      object[key] = createWrapper(object[key], 1, null, null, object);
     }
     return object;
   }
@@ -4052,7 +4077,7 @@
    * // => 'hi fred'
    */
   function partial(func) {
-    return createBound(func, 16, slice(arguments, 1));
+    return createWrapper(func, 16, slice(arguments, 1));
   }
 
   /**
@@ -4129,7 +4154,7 @@
    * // => '<p>Fred, Wilma, &amp; Pebbles</p>'
    */
   function wrap(value, wrapper) {
-    return createBound(wrapper, 16, [value]);
+    return createWrapper(wrapper, 16, [value]);
   }
 
   /*--------------------------------------------------------------------------*/