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ng-arc

v1.0.1

Published

A new, proven, simpler architecture/best practice for Angular 1.x

Downloads

4

Readme

Introduction

Over years of building Angular 1.x projects, and trying out recommended best practices, I came to realize that some things just weren't working, and there was a better way. The following summarizes my observations and new recommended best practices which I have personally used and can vouch for their efficacy in reducing defects and increasing development velocity and maintainability. Comments and PRs are welcome.

Angular, the Good Parts

  • Separation of concerns -- html templates, js services.
  • track by in ng-repeat. Lack of track by in ng-repeat expressions is the primary source of all complaints about angular performance.
  • $scope
    • $scope handles user input and asynchronous events very well. It requires some work ($apply, etc.) to handle non-angular asynchronous events, but this is intuitive and well worth the cost.
  • Services
    • Singletons provide easy access to data and shared functionality.
    • No reasoning about instances.
    • No babying object references if all references are fully-qualified.
      • This is a problem you encounter when you write $scope.data = MyService.data in a controller, then later replace MyService.data somewhere else, e.g. after an $http get to update the data).
    • $http
  • Directives
    • Declarative reaction to user input events or model updates
  • testing; no-fuss methods are provided by Angular 1 to help set up test cases

The less-good parts

  • $scope events.
  • Angular "Controllers"
    • $scope is the controller in Angular. It reacts to user input or async changes in the data model, binding the UI and data together.
    • Input events should directly trigger logic in well-known and visible services.

Bad practices

  • Using event systems. This seriously inhibits predictability and the ability to causes additional bugs, because you don't know who is broadcasting or listening to events.
  • Building complicated service hierarchies or relationships.
    • Instead, the relationship should be made obvious in the template. E.g. <div class="username" with-service="{f: 'MyFriends', rp: '$routeParameters'}">{{ f.byUsername[rp.username] }}</div>
  • "Components" as replacement for native HTML elements.
    • Directives should very rarely use the element type, opting for augmenting the behavior of native HTML to avoid creating tribal DSLs.

New Best Practices

  • A new directive that supports explicitly importing services into angular templates.
  • Effective deprecation of "Controllers." Much more often than not, these add a layer of obscurity and end up taking references. This might seem to clean things up, but it creates bugs when the references become stale.