Modularize master branch.

sortedIndex.js

@@ -0,0 +1,24 @@
+import baseSortedIndex from './_baseSortedIndex.js';
+
+/**
+ * Uses a binary search to determine the lowest index at which `value`
+ * should be inserted into `array` in order to maintain its sort order.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @returns {number} Returns the index at which `value` should be inserted
+ *  into `array`.
+ * @example
+ *
+ * _.sortedIndex([30, 50], 40);
+ * // => 1
+ */
+function sortedIndex(array, value) {
+  return baseSortedIndex(array, value);
+}
+
+export default sortedIndex;