--- /dev/null
+var arrayExtremum = require('./arrayExtremum'),
+ baseCallback = require('./baseCallback'),
+ baseExtremum = require('./baseExtremum'),
+ isArray = require('../lang/isArray'),
+ isIterateeCall = require('./isIterateeCall'),
+ toIterable = require('./toIterable');
+
+/**
+ * Creates a `_.max` or `_.min` function.
+ *
+ * @private
+ * @param {Function} comparator The function used to compare values.
+ * @param {*} exValue The initial extremum value.
+ * @returns {Function} Returns the new extremum function.
+ */
+function createExtremum(comparator, exValue) {
+ return function(collection, iteratee, thisArg) {
+ if (thisArg && isIterateeCall(collection, iteratee, thisArg)) {
+ iteratee = undefined;
+ }
+ iteratee = baseCallback(iteratee, thisArg, 3);
+ if (iteratee.length == 1) {
+ collection = isArray(collection) ? collection : toIterable(collection);
+ var result = arrayExtremum(collection, iteratee, comparator, exValue);
+ if (!(collection.length && result === exValue)) {
+ return result;
+ }
+ }
+ return baseExtremum(collection, iteratee, comparator, exValue);
+ };
+}
+
+module.exports = createExtremum;