Maybe you know the situation when you deploy some page, check it fastly and go away from the office feeling good about your job done. Then a colleague calls you and you hear “What did you do? It is not working!”.
I am playing a little bit with PHP micro framework Slim and javascript Backbone.js. Therefor I created two separate projects with URLs : mywebapp.dev for front-end ( Backbone.js ) and api.mywebapp.dev for back-end ( Slim ). The problem occurred nearly immediately : Cross-Origin Resource Sharing ( CORS ).
If you work on a larger project, you have surely write a build script, which helps you with repeating tasks. This can be concatenating javascripts, compiling SASS / LESS files, moving or deleting some files, etc. Each task like this can be ( relatively ) easily defined in Grunt and it will take care of everything.