Add some promise helpers to lodash

2026-05-17 22:28:38 -05:00 · 2015-05-15 16:46:34 -04:00
parent 862cc40de0
commit ae5594a853
3 changed files with 192 additions and 0 deletions
@@ -0,0 +1,75 @@
+import 'tower/shared/main';
+
+describe('LodashAsPromised', function() {
+
+    var _;
+    var $q;
+
+    function addOne(num) {
+        return num + 1;
+    }
+
+    function isEven(value) {
+        return value % 2 === 0;
+    }
+
+    function sum(memo, value) {
+        return memo + value;
+    }
+
+    beforeEach(module('shared'));
+
+    beforeEach(inject(['lodashAsPromised', '$q', function(_lodash, _$q) {
+        _ = _lodash;
+        $q = _$q;
+    }]));
+
+    function checkPromiseAndArray(fnName, cb, coll, result) {
+        context(fnName, function() {
+            // var itFn = fnName === 'compact' ? it : xit;
+            var itFn = it;
+
+            itFn('works with a promise', function() {
+                var values = coll.map($q.when);
+                var methodName = 'then' + _.capitalize(fnName);
+                var promise;
+                // _.log('promises for _', values);
+                if (fnName === 'reduce') {
+                    promise = _[methodName](values, cb, 0);
+                } else {
+                    promise = _[methodName](values, cb);
+                }
+
+                inject(['$rootScope', function($rootScope) {
+                    setTimeout(function() {
+                        $rootScope.$apply();
+                    }, 1);
+                }]);
+
+                return expect(promise).to.eventually.deep.equal(result);
+            });
+
+            itFn('works with an array', function() {
+                var value = _[fnName](coll, cb, 0);
+                expect(value).to.deep.equal(result);
+            });
+        });
+    }
+
+    checkPromiseAndArray('map', addOne, [1,2,3,4], [2,3,4,5]);
+    checkPromiseAndArray('filter', isEven, [1,2,3,4,5,6,7,8], [2,4,6,8]);
+    checkPromiseAndArray('reduce', sum, [1,2,3,4], 10);
+    checkPromiseAndArray('pluck', 'blah', [{ blah: 'diddy' }, { blah: 'doo' }], ['diddy', 'doo']);
+    checkPromiseAndArray('compact', null, ['blah', null, 'diddy', false, 'doo', undefined], ['blah', 'diddy', 'doo']);
+    checkPromiseAndArray('xor', [4,2], [1,2], [1,4]);
+    checkPromiseAndArray('groupBy', Math.floor, [4.2,6.1,6.4],  { '4': [4.2], '6': [6.1,6.4] } );
+
+    it('allows chaining', function() {
+        function dub(n) { return n * 2; }
+
+        var arr = [1,2,3,4].map($q.when);
+
+        expect(_(arr).thenMap(dub)).to.eventually.deep.equal([2,4,6,8]);
+    });
+
+});