Question 1

What is factory in ServiceNow?

Accepted Answer

Most common pattern. `app.factory('x', function(deps) { return { ... }; })`. The return value is the singleton.

Question 2

What is service in ServiceNow?

Accepted Answer

`app.service('x', function() { this.do = ...; })`. Use when you prefer ES5 class-style. Equivalent expressive power to factory.

Question 3

What is provider in ServiceNow?

Accepted Answer

Has a $get function returning the service. Only providers can be injected into app.config() — use when setup must happen before injection (e.g. $httpProvider interceptors).

Question 4

What is $q in ServiceNow?

Accepted Answer

$q.defer() / $q.when() / $q.all(). Resolutions auto-trigger a digest, unlike native Promise. Stick to $q in 1.x unless you wrap manually.

Question 5

What is value in ServiceNow?

Accepted Answer

`app.value('apiBase', '/api')`. Injectable into services and controllers, but NOT into app.config().

Question 6

What is constant in ServiceNow?

Accepted Answer

Like value but available during the config phase (before run blocks). Common pattern for API URLs and feature flags.

Question 7

What is decorator in ServiceNow?

Accepted Answer

$provide.decorator('$log', function($delegate) { ... }). Returned object replaces the original.

Question 8

What is Array-form DI in ServiceNow?

Accepted Answer

`['$http', function($http) { ... }]`. Or use ng-annotate at build time.

Question 9

What is $injector in ServiceNow?

Accepted Answer

Rarely used directly. `$injector.get('serviceName')` for runtime-conditional lookup.

Question 10

What is config block in ServiceNow?

Accepted Answer

`app.config(function($routeProvider) { ... })`. Only providers and constants are injectable here.

Question 11

What is run block in ServiceNow?

Accepted Answer

`app.run(function($rootScope) { ... })`. Use for cross-cutting startup logic (auth bootstrap, global event listeners).

Question 12

What is $http in ServiceNow?

Accepted Answer

Returns an HttpPromise with .success/.error (legacy) and .then. Configurable via $httpProvider in config.

Question 13

What is $resource in ServiceNow?

Accepted Answer

Higher-level than $http; declarative endpoints (`User.get({id})`). Requires the angular-resource module.

Question 14

What is Interceptor in ServiceNow?

Accepted Answer

Register on $httpProvider.interceptors. Common uses: attach auth token, global error handling, retries.

Question 15

What is $cacheFactory in ServiceNow?

Accepted Answer

$http and $templateCache use it. Roll your own keyed cache when you need fine-grained eviction.

💉 SERVICES & DI

Term Glossary