Bump to v4.0.0.

lastIndexOf.js

@@ -0,0 +1,49 @@
+import indexOfNaN from './internal/indexOfNaN';
+import toInteger from './toInteger';
+
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeMax = Math.max,
+    nativeMin = Math.min;
+
+/**
+ * This method is like `_.indexOf` except that it iterates over elements of
+ * `array` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to search.
+ * @param {*} value The value to search for.
+ * @param {number} [fromIndex=array.length-1] The index to search from.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ * @example
+ *
+ * _.lastIndexOf([1, 2, 1, 2], 2);
+ * // => 3
+ *
+ * // using `fromIndex`
+ * _.lastIndexOf([1, 2, 1, 2], 2, 2);
+ * // => 1
+ */
+function lastIndexOf(array, value, fromIndex) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return -1;
+  }
+  var index = length;
+  if (fromIndex !== undefined) {
+    index = toInteger(fromIndex);
+    index = (index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1)) + 1;
+  }
+  if (value !== value) {
+    return indexOfNaN(array, index, true);
+  }
+  while (index--) {
+    if (array[index] === value) {
+      return index;
+    }
+  }
+  return -1;
+}
+
+export default lastIndexOf;