Bump to v3.9.0.

internal/baseExtremum.js

@@ -0,0 +1,30 @@
+define(['./baseEach'], function(baseEach) {
+
+  /**
+   * Gets the extremum value of `collection` invoking `iteratee` for each value
+   * in `collection` to generate the criterion by which the value is ranked.
+   * The `iteratee` is invoked with three arguments: (value, index|key, collection).
+   *
+   * @private
+   * @param {Array|Object|string} collection The collection to iterate over.
+   * @param {Function} iteratee The function invoked per iteration.
+   * @param {Function} comparator The function used to compare values.
+   * @param {*} exValue The initial extremum value.
+   * @returns {*} Returns the extremum value.
+   */
+  function baseExtremum(collection, iteratee, comparator, exValue) {
+    var computed = exValue,
+        result = computed;
+
+    baseEach(collection, function(value, index, collection) {
+      var current = +iteratee(value, index, collection);
+      if (comparator(current, computed) || (current === exValue && current === result)) {
+        computed = current;
+        result = value;
+      }
+    });
+    return result;
+  }
+
+  return baseExtremum;
+});