add order by behaviour with array similar to get method (lodash#4453)

* add order by behaviour with array similar to get method

* remove typo for fixing orderby iteratee assignment

* lint fixes

* update test case

* include package-lock from master

* Add identity function for default iteratee

.internal/baseOrderBy.js

@@ -1,8 +1,12 @@
 import baseEach from './baseEach.js'
 import baseSortBy from './baseSortBy.js'
+import baseGet from './baseGet.js'
 import compareMultiple from './compareMultiple.js'
 import isArrayLike from '../isArrayLike.js'
 
+// As existing identity function is in ../test/utils.js, so defining it here, it can be moved to utils
+const identity = value => value;
+
 /**
  * The base implementation of `orderBy` without param guards.
  *
@@ -15,7 +19,12 @@ import isArrayLike from '../isArrayLike.js'
 function baseOrderBy(collection, iteratees, orders) {
   let criteriaIndex = -1
   let eachIndex = -1
-  iteratees = iteratees.length ? iteratees : [(value) => value]
+  iteratees = iteratees.length ? iteratees.map((iteratee) => {
+    if (Array.isArray(iteratee)) {
+      return (value) => baseGet(value, iteratee)
+    }
+    return iteratee
+  }) : [identity]
 
   const result = isArrayLike(collection) ? new Array(collection.length) : []
 

test/orderBy.js

@@ -11,11 +11,29 @@ describe('orderBy', function() {
     { 'a': 'y', 'b': 2 }
   ];
 
+  var nestedObj = [
+    { id: '4', address: { zipCode: 4, streetName: 'Beta' } },
+    { id: '3', address: { zipCode: 3, streetName: 'Alpha' } },
+    { id: '1', address: { zipCode: 1, streetName: 'Alpha' } },
+    { id: '2', address: { zipCode: 2, streetName: 'Alpha' } },
+    { id: '5', address: { zipCode: 4, streetName: 'Alpha' } },
+  ];
+
+
   it('should sort by a single property by a specified order', function() {
     var actual = orderBy(objects, 'a', 'desc');
     assert.deepStrictEqual(actual, [objects[1], objects[3], objects[0], objects[2]]);
   });
 
+  it('should sort by nested key in array format', () => {
+    var actual = orderBy(
+      nestedObj,
+      [['address','zipCode'], ['address.streetName']],
+      ['asc', 'desc'],
+    );
+    assert.deepStrictEqual(actual, [nestedObj[2], nestedObj[3], nestedObj[0], nestedObj[1]], nestedObj[4]);
+  });
+
   it('should sort by multiple properties by specified orders', function() {
     var actual = orderBy(objects, ['a', 'b'], ['desc', 'asc']);
     assert.deepStrictEqual(actual, [objects[3], objects[1], objects[2], objects[0]]);