Ensure _.min and _.max can be used as the callback of _.map. [closes #379]

dist/lodash.compat.js

@@ -2900,6 +2900,7 @@
       if (!isObject(object)) {
         return object;
       }
+
       // allows working with `_.reduce` and `_.reduceRight` without using
       // their `index` and `collection` arguments
       if (typeof args[2] != 'number') {
@@ -3779,7 +3780,12 @@
       var computed = -Infinity,
           result = computed;
 
-      if (!callback && isArray(collection)) {
+      // allows working with functions like `_.map` without using
+      // their `index` argument as a callback
+      if (typeof callback != 'function' && thisArg && thisArg[callback] === collection) {
+        callback = null;
+      }
+      if (callback == null && isArray(collection)) {
         var index = -1,
             length = collection.length;
 
@@ -3790,7 +3796,7 @@
           }
         }
       } else {
-        callback = (!callback && isString(collection))
+        callback = (callback == null && isString(collection))
           ? charAtCallback
           : lodash.createCallback(callback, thisArg, 3);
 
@@ -3849,7 +3855,12 @@
       var computed = Infinity,
           result = computed;
 
-      if (!callback && isArray(collection)) {
+      // allows working with functions like `_.map` without using
+      // their `index` argument as a callback
+      if (typeof callback != 'function' && thisArg && thisArg[callback] === collection) {
+        callback = null;
+      }
+      if (callback == null && isArray(collection)) {
         var index = -1,
             length = collection.length;
 
@@ -3860,7 +3871,7 @@
           }
         }
       } else {
-        callback = (!callback && isString(collection))
+        callback = (callback == null && isString(collection))
           ? charAtCallback
           : lodash.createCallback(callback, thisArg, 3);
 
@@ -4034,8 +4045,8 @@
      * @category Collections
      * @param {Array|Object|string} collection The collection to sample.
      * @param {number} [n] The number of elements to sample.
-     * @param- {Object} [guard] Allows working with functions, like `_.map`,
-     *  without using their `key` and `object` arguments as sources.
+     * @param- {Object} [guard] Allows working with functions like `_.map`
+     *  without using their `index` arguments as `n`.
      * @returns {Array} Returns the random sample(s) of `collection`.
      * @example
      *
@@ -4577,7 +4588,7 @@
       // juggle arguments
       if (typeof isShallow != 'boolean' && isShallow != null) {
         thisArg = callback;
-        callback = !(thisArg && thisArg[isShallow] === array) ? isShallow : null;
+        callback = (typeof isShallow != 'function' && thisArg && thisArg[isShallow] === array) ? null : isShallow;
         isShallow = false;
       }
       if (callback != null) {
@@ -4931,7 +4942,7 @@
         end = start;
         start = 0;
       }
-      // use `Array(length)` so engines, like Chakra and V8, avoid slower modes
+      // use `Array(length)` so engines like Chakra and V8 avoid slower modes
       // http://youtu.be/XAqIpGU8ZZk#t=17m25s
       var index = -1,
           length = nativeMax(0, ceil((end - start) / (step || 1))),
@@ -5192,7 +5203,7 @@
       // juggle arguments
       if (typeof isSorted != 'boolean' && isSorted != null) {
         thisArg = callback;
-        callback = !(thisArg && thisArg[isSorted] === array) ? isSorted : null;
+        callback = (typeof isSorted != 'function' && thisArg && thisArg[isSorted] === array) ? null : isSorted;
         isSorted = false;
       }
       if (callback != null) {
@@ -6842,7 +6853,7 @@
   // expose Lo-Dash
   var _ = runInContext();
 
-  // some AMD build optimizers, like r.js, check for condition patterns like the following:
+  // some AMD build optimizers like r.js check for condition patterns like the following:
   if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
     // Expose Lo-Dash to the global object even when an AMD loader is present in
     // case Lo-Dash was injected by a third-party script and not intended to be