Added the underscore node_module.

node_modules/underscore/modules/_createIndexFinder.js

@@ -0,0 +1,28 @@
+import getLength from './_getLength.js';
+import { slice } from './_setup.js';
+import isNaN from './isNaN.js';
+
+// Internal function to generate the `_.indexOf` and `_.lastIndexOf` functions.
+export default function createIndexFinder(dir, predicateFind, sortedIndex) {
+  return function(array, item, idx) {
+    var i = 0, length = getLength(array);
+    if (typeof idx == 'number') {
+      if (dir > 0) {
+        i = idx >= 0 ? idx : Math.max(idx + length, i);
+      } else {
+        length = idx >= 0 ? Math.min(idx + 1, length) : idx + length + 1;
+      }
+    } else if (sortedIndex && idx && length) {
+      idx = sortedIndex(array, item);
+      return array[idx] === item ? idx : -1;
+    }
+    if (item !== item) {
+      idx = predicateFind(slice.call(array, i, length), isNaN);
+      return idx >= 0 ? idx + i : -1;
+    }
+    for (idx = dir > 0 ? i : length - 1; idx >= 0 && idx < length; idx += dir) {
+      if (array[idx] === item) return idx;
+    }
+    return -1;
+  };
+}