add book.js

node_modules/lodash/internal/sortedUniq.js

@@ -0,0 +1,29 @@
+/**
+ * An implementation of `_.uniq` optimized for sorted arrays without support
+ * for callback shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Function} [iteratee] The function invoked per iteration.
+ * @returns {Array} Returns the new duplicate free array.
+ */
+function sortedUniq(array, iteratee) {
+  var seen,
+      index = -1,
+      length = array.length,
+      resIndex = -1,
+      result = [];
+
+  while (++index < length) {
+    var value = array[index],
+        computed = iteratee ? iteratee(value, index, array) : value;
+
+    if (!index || seen !== computed) {
+      seen = computed;
+      result[++resIndex] = value;
+    }
+  }
+  return result;
+}
+
+module.exports = sortedUniq;