--- /dev/null
+var eq = require('./eq');
+
+/**
+ * The base implementation of `_.sortedUniqBy` without support for iteratee
+ * shorthands.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @returns {Array} Returns the new duplicate free array.
+ */
+function baseSortedUniqBy(array, iteratee) {
+ var index = 0,
+ length = array.length,
+ value = array[0],
+ computed = iteratee ? iteratee(value) : value,
+ seen = computed,
+ resIndex = 0,
+ result = [value];
+
+ while (++index < length) {
+ value = array[index],
+ computed = iteratee ? iteratee(value) : value;
+
+ if (!eq(computed, seen)) {
+ seen = computed;
+ result[++resIndex] = value;
+ }
+ }
+ return result;
+}
+
+module.exports = baseSortedUniqBy;