Add baseRest.

lodash.js

@@ -3664,6 +3664,40 @@
       return result;
     }
 
+    /**
+     * The base implementation of `_.rest` which doesn't validate or coerce arguments.
+     *
+     * @private
+     * @param {Function} func The function to apply a rest parameter to.
+     * @param {number} [start=func.length-1] The start position of the rest parameter.
+     * @returns {Function} Returns the new function.
+     */
+    function baseRest(func, start) {
+      start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
+      return function() {
+        var args = arguments,
+            index = -1,
+            length = nativeMax(args.length - start, 0),
+            array = Array(length);
+
+        while (++index < length) {
+          array[index] = args[start + index];
+        }
+        switch (start) {
+          case 0: return func.call(this, array);
+          case 1: return func.call(this, args[0], array);
+          case 2: return func.call(this, args[0], args[1], array);
+        }
+        var otherArgs = Array(start + 1);
+        index = -1;
+        while (++index < start) {
+          otherArgs[index] = args[index];
+        }
+        otherArgs[start] = array;
+        return apply(func, this, otherArgs);
+      };
+    }
+
     /**
      * The base implementation of `_.set`.
      *
@@ -4487,7 +4521,7 @@
      * @returns {Function} Returns the new assigner function.
      */
     function createAssigner(assigner) {
-      return rest(function(object, sources) {
+      return baseRest(function(object, sources) {
         var index = -1,
             length = sources.length,
             customizer = length > 1 ? sources[length - 1] : undefined,
@@ -4724,7 +4758,7 @@
      * @returns {Function} Returns the new flow function.
      */
     function createFlow(fromRight) {
-      return rest(function(funcs) {
+      return baseRest(function(funcs) {
         funcs = baseFlatten(funcs, 1);
 
         var length = funcs.length,
@@ -4909,12 +4943,12 @@
      * @returns {Function} Returns the new over function.
      */
     function createOver(arrayFunc) {
-      return rest(function(iteratees) {
+      return baseRest(function(iteratees) {
         iteratees = (iteratees.length == 1 && isArray(iteratees[0]))
           ? arrayMap(iteratees[0], baseUnary(getIteratee()))
           : arrayMap(baseFlatten(iteratees, 1), baseUnary(getIteratee()));
 
-        return rest(function(args) {
+        return baseRest(function(args) {
           var thisArg = this;
           return arrayFunc(iteratees, function(iteratee) {
             return apply(iteratee, thisArg, args);
@@ -6406,7 +6440,7 @@
      * _.difference([2, 1], [2, 3]);
      * // => [1]
      */
-    var difference = rest(function(array, values) {
+    var difference = baseRest(function(array, values) {
       return isArrayLikeObject(array)
         ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))
         : [];
@@ -6437,7 +6471,7 @@
      * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
      * // => [{ 'x': 2 }]
      */
-    var differenceBy = rest(function(array, values) {
+    var differenceBy = baseRest(function(array, values) {
       var iteratee = last(values);
       if (isArrayLikeObject(iteratee)) {
         iteratee = undefined;
@@ -6470,7 +6504,7 @@
      * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);
      * // => [{ 'x': 2, 'y': 1 }]
      */
-    var differenceWith = rest(function(array, values) {
+    var differenceWith = baseRest(function(array, values) {
       var comparator = last(values);
       if (isArrayLikeObject(comparator)) {
         comparator = undefined;
@@ -6958,7 +6992,7 @@
      * _.intersection([2, 1], [2, 3]);
      * // => [2]
      */
-    var intersection = rest(function(arrays) {
+    var intersection = baseRest(function(arrays) {
       var mapped = arrayMap(arrays, castArrayLikeObject);
       return (mapped.length && mapped[0] === arrays[0])
         ? baseIntersection(mapped)
@@ -6987,7 +7021,7 @@
      * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
      * // => [{ 'x': 1 }]
      */
-    var intersectionBy = rest(function(arrays) {
+    var intersectionBy = baseRest(function(arrays) {
       var iteratee = last(arrays),
           mapped = arrayMap(arrays, castArrayLikeObject);
 
@@ -7022,7 +7056,7 @@
      * _.intersectionWith(objects, others, _.isEqual);
      * // => [{ 'x': 1, 'y': 2 }]
      */
-    var intersectionWith = rest(function(arrays) {
+    var intersectionWith = baseRest(function(arrays) {
       var comparator = last(arrays),
           mapped = arrayMap(arrays, castArrayLikeObject);
 
@@ -7168,7 +7202,7 @@
      * console.log(array);
      * // => ['b', 'b']
      */
-    var pull = rest(pullAll);
+    var pull = baseRest(pullAll);
 
     /**
      * This method is like `_.pull` except that it accepts an array of values to remove.
@@ -7279,7 +7313,7 @@
      * console.log(pulled);
      * // => ['b', 'd']
      */
-    var pullAt = rest(function(array, indexes) {
+    var pullAt = baseRest(function(array, indexes) {
       indexes = baseFlatten(indexes, 1);
 
       var length = array ? array.length : 0,
@@ -7787,7 +7821,7 @@
      * _.union([2], [1, 2]);
      * // => [2, 1]
      */
-    var union = rest(function(arrays) {
+    var union = baseRest(function(arrays) {
       return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true));
     });
 
@@ -7815,7 +7849,7 @@
      * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
      * // => [{ 'x': 1 }, { 'x': 2 }]
      */
-    var unionBy = rest(function(arrays) {
+    var unionBy = baseRest(function(arrays) {
       var iteratee = last(arrays);
       if (isArrayLikeObject(iteratee)) {
         iteratee = undefined;
@@ -7844,7 +7878,7 @@
      * _.unionWith(objects, others, _.isEqual);
      * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
      */
-    var unionWith = rest(function(arrays) {
+    var unionWith = baseRest(function(arrays) {
       var comparator = last(arrays);
       if (isArrayLikeObject(comparator)) {
         comparator = undefined;
@@ -8017,7 +8051,7 @@
      * _.without([2, 1, 2, 3], 1, 2);
      * // => [3]
      */
-    var without = rest(function(array, values) {
+    var without = baseRest(function(array, values) {
       return isArrayLikeObject(array)
         ? baseDifference(array, values)
         : [];
@@ -8041,7 +8075,7 @@
      * _.xor([2, 1], [2, 3]);
      * // => [1, 3]
      */
-    var xor = rest(function(arrays) {
+    var xor = baseRest(function(arrays) {
       return baseXor(arrayFilter(arrays, isArrayLikeObject));
     });
 
@@ -8068,7 +8102,7 @@
      * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
      * // => [{ 'x': 2 }]
      */
-    var xorBy = rest(function(arrays) {
+    var xorBy = baseRest(function(arrays) {
       var iteratee = last(arrays);
       if (isArrayLikeObject(iteratee)) {
         iteratee = undefined;
@@ -8096,7 +8130,7 @@
      * _.xorWith(objects, others, _.isEqual);
      * // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
      */
-    var xorWith = rest(function(arrays) {
+    var xorWith = baseRest(function(arrays) {
       var comparator = last(arrays);
       if (isArrayLikeObject(comparator)) {
         comparator = undefined;
@@ -8120,7 +8154,7 @@
      * _.zip(['a', 'b'], [1, 2], [true, false]);
      * // => [['a', 1, true], ['b', 2, false]]
      */
-    var zip = rest(unzip);
+    var zip = baseRest(unzip);
 
     /**
      * This method is like `_.fromPairs` except that it accepts two arrays,
@@ -8180,7 +8214,7 @@
      * });
      * // => [111, 222]
      */
-    var zipWith = rest(function(arrays) {
+    var zipWith = baseRest(function(arrays) {
       var length = arrays.length,
           iteratee = length > 1 ? arrays[length - 1] : undefined;
 
@@ -8296,7 +8330,7 @@
      * _(object).at(['a[0].b.c', 'a[1]']).value();
      * // => [3, 4]
      */
-    var wrapperAt = rest(function(paths) {
+    var wrapperAt = baseRest(function(paths) {
       paths = baseFlatten(paths, 1);
       var length = paths.length,
           start = length ? paths[0] : 0,
@@ -8950,7 +8984,7 @@
      * _.invokeMap([123, 456], String.prototype.split, '');
      * // => [['1', '2', '3'], ['4', '5', '6']]
      */
-    var invokeMap = rest(function(collection, path, args) {
+    var invokeMap = baseRest(function(collection, path, args) {
       var index = -1,
           isFunc = typeof path == 'function',
           isProp = isKey(path),
@@ -9439,7 +9473,7 @@
      * });
      * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
      */
-    var sortBy = rest(function(collection, iteratees) {
+    var sortBy = baseRest(function(collection, iteratees) {
       if (collection == null) {
         return [];
       }
@@ -9604,7 +9638,7 @@
      * bound('hi');
      * // => 'hi fred!'
      */
-    var bind = rest(function(func, thisArg, partials) {
+    var bind = baseRest(function(func, thisArg, partials) {
       var bitmask = BIND_FLAG;
       if (partials.length) {
         var holders = replaceHolders(partials, getHolder(bind));
@@ -9658,7 +9692,7 @@
      * bound('hi');
      * // => 'hiya fred!'
      */
-    var bindKey = rest(function(object, key, partials) {
+    var bindKey = baseRest(function(object, key, partials) {
       var bitmask = BIND_FLAG | BIND_KEY_FLAG;
       if (partials.length) {
         var holders = replaceHolders(partials, getHolder(bindKey));
@@ -9950,7 +9984,7 @@
      * }, 'deferred');
      * // => Logs 'deferred' after one or more milliseconds.
      */
-    var defer = rest(function(func, args) {
+    var defer = baseRest(function(func, args) {
       return baseDelay(func, 1, args);
     });
 
@@ -9973,7 +10007,7 @@
      * }, 1000, 'later');
      * // => Logs 'later' after one second.
      */
-    var delay = rest(function(func, wait, args) {
+    var delay = baseRest(function(func, wait, args) {
       return baseDelay(func, toNumber(wait) || 0, args);
     });
 
@@ -10148,13 +10182,13 @@
      * func(10, 5);
      * // => [100, 10]
      */
-    var overArgs = rest(function(func, transforms) {
+    var overArgs = baseRest(function(func, transforms) {
       transforms = (transforms.length == 1 && isArray(transforms[0]))
         ? arrayMap(transforms[0], baseUnary(getIteratee()))
         : arrayMap(baseFlatten(transforms, 1), baseUnary(getIteratee()));
 
       var funcsLength = transforms.length;
-      return rest(function(args) {
+      return baseRest(function(args) {
         var index = -1,
             length = nativeMin(args.length, funcsLength);
 
@@ -10198,7 +10232,7 @@
      * greetFred('hi');
      * // => 'hi fred'
      */
-    var partial = rest(function(func, partials) {
+    var partial = baseRest(function(func, partials) {
       var holders = replaceHolders(partials, getHolder(partial));
       return createWrap(func, PARTIAL_FLAG, undefined, partials, holders);
     });
@@ -10235,7 +10269,7 @@
      * sayHelloTo('fred');
      * // => 'hello fred'
      */
-    var partialRight = rest(function(func, partials) {
+    var partialRight = baseRest(function(func, partials) {
       var holders = replaceHolders(partials, getHolder(partialRight));
       return createWrap(func, PARTIAL_RIGHT_FLAG, undefined, partials, holders);
     });
@@ -10262,7 +10296,7 @@
      * rearged('b', 'c', 'a')
      * // => ['a', 'b', 'c']
      */
-    var rearg = rest(function(func, indexes) {
+    var rearg = baseRest(function(func, indexes) {
       return createWrap(func, REARG_FLAG, undefined, undefined, undefined, baseFlatten(indexes, 1));
     });
 
@@ -10295,29 +10329,8 @@
       if (typeof func != 'function') {
         throw new TypeError(FUNC_ERROR_TEXT);
       }
-      start = nativeMax(start === undefined ? (func.length - 1) : toInteger(start), 0);
+      start = start === undefined ? start : toInteger(start);
-      return function() {
+      return baseRest(func, start);
-        var args = arguments,
-            index = -1,
-            length = nativeMax(args.length - start, 0),
-            array = Array(length);
-
-        while (++index < length) {
-          array[index] = args[start + index];
-        }
-        switch (start) {
-          case 0: return func.call(this, array);
-          case 1: return func.call(this, args[0], array);
-          case 2: return func.call(this, args[0], args[1], array);
-        }
-        var otherArgs = Array(start + 1);
-        index = -1;
-        while (++index < start) {
-          otherArgs[index] = args[index];
-        }
-        otherArgs[start] = array;
-        return apply(func, this, otherArgs);
-      };
     }
 
     /**
@@ -10359,7 +10372,7 @@
         throw new TypeError(FUNC_ERROR_TEXT);
       }
       start = start === undefined ? 0 : nativeMax(toInteger(start), 0);
-      return rest(function(args) {
+      return baseRest(function(args) {
         var array = args[start],
             otherArgs = castSlice(args, 0, start);
 
@@ -12240,7 +12253,7 @@
      * _.at(object, ['a[0].b.c', 'a[1]']);
      * // => [3, 4]
      */
-    var at = rest(function(object, paths) {
+    var at = baseRest(function(object, paths) {
       return baseAt(object, baseFlatten(paths, 1));
     });
 
@@ -12304,7 +12317,7 @@
      * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
      * // => { 'a': 1, 'b': 2 }
      */
-    var defaults = rest(function(args) {
+    var defaults = baseRest(function(args) {
       args.push(undefined, assignInDefaults);
       return apply(assignInWith, undefined, args);
     });
@@ -12328,7 +12341,7 @@
      * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } });
      * // => { 'a': { 'b': 2, 'c': 3 } }
      */
-    var defaultsDeep = rest(function(args) {
+    var defaultsDeep = baseRest(function(args) {
       args.push(undefined, mergeDefaults);
       return apply(mergeWith, undefined, args);
     });
@@ -12758,7 +12771,7 @@
      * _.invoke(object, 'a[0].b.c.slice', 1, 3);
      * // => [2, 3]
      */
-    var invoke = rest(baseInvoke);
+    var invoke = baseRest(baseInvoke);
 
     /**
      * Creates an array of the own enumerable property names of `object`.
@@ -13009,7 +13022,7 @@
      * _.omit(object, ['a', 'c']);
      * // => { 'b': '2' }
      */
-    var omit = rest(function(object, props) {
+    var omit = baseRest(function(object, props) {
       if (object == null) {
         return {};
       }
@@ -13061,7 +13074,7 @@
      * _.pick(object, ['a', 'c']);
      * // => { 'a': 1, 'c': 3 }
      */
-    var pick = rest(function(object, props) {
+    var pick = baseRest(function(object, props) {
       return object == null ? {} : basePick(object, arrayMap(baseFlatten(props, 1), toKey));
     });
 
@@ -14741,7 +14754,7 @@
      *   elements = [];
      * }
      */
-    var attempt = rest(function(func, args) {
+    var attempt = baseRest(function(func, args) {
       try {
         return apply(func, undefined, args);
       } catch (e) {
@@ -14775,7 +14788,7 @@
      * jQuery(element).on('click', view.click);
      * // => Logs 'clicked docs' when clicked.
      */
-    var bindAll = rest(function(object, methodNames) {
+    var bindAll = baseRest(function(object, methodNames) {
       arrayEach(baseFlatten(methodNames, 1), function(key) {
         key = toKey(key);
         object[key] = bind(object[key], object);
@@ -14823,7 +14836,7 @@
         return [toIteratee(pair[0]), pair[1]];
       });
 
-      return rest(function(args) {
+      return baseRest(function(args) {
         var index = -1;
         while (++index < length) {
           var pair = pairs[index];
@@ -15101,7 +15114,7 @@
      * _.map(objects, _.method(['a', 'b']));
      * // => [2, 1]
      */
-    var method = rest(function(path, args) {
+    var method = baseRest(function(path, args) {
       return function(object) {
         return baseInvoke(object, path, args);
       };
@@ -15130,7 +15143,7 @@
      * _.map([['a', '2'], ['c', '0']], _.methodOf(object));
      * // => [2, 0]
      */
-    var methodOf = rest(function(object, args) {
+    var methodOf = baseRest(function(object, args) {
       return function(path) {
         return baseInvoke(object, path, args);
       };
@@ -15266,7 +15279,7 @@
      */
     function nthArg(n) {
       n = toInteger(n);
-      return rest(function(args) {
+      return baseRest(function(args) {
         return baseNth(args, n);
       });
     }
@@ -16420,7 +16433,7 @@
       return this.reverse().find(predicate);
     };
 
-    LazyWrapper.prototype.invokeMap = rest(function(path, args) {
+    LazyWrapper.prototype.invokeMap = baseRest(function(path, args) {
       if (typeof path == 'function') {
         return new LazyWrapper(this);
       }