Why using ember-command? ​

There is a couple of reasons why you want to use ember-command. Implementation of the Command design pattern from Command-Query-Separation for ember.

Separating Business Logic from UI ​

Part of your tactical design is to separate business logic from your UI. At best, business logic stays pure JS/TS and frameworks provide a connection to integrate with their DI systems and other framework specific mechanics.

Business Logic splits into commands and queries and it is strongly advised to separate both, also known as the command and query separation pattern (cqs).

Ember provides two libraries to connect your pure business logic:

• ember-command for commands/actions/functions
• ember-ability for queries/questions/abilities

First-Class Functions ​

ember-command takes care of running your business functions, so you can safely write resilient business logic, properly backed up by unit tests. When composing things together:

• Commands are primitives to be passed around
• Commands are just functions
• Commands are composable of many functions (but stays a function)
• Commands can have/be a link (but stays a function)
• Use commands with (fn) and enjoy partial applications (because it stayed a function)

What you'll get:

• A Command class to extend from for your implementation
• A LinkCommand as syntactic sugar for creating a link (through ember-link)
• A @command decorator to connect your component with your command
• A <CommandElement> component as your building block to attach your command to the UI
• An action() function to connect your pure business functions with ember' DI system
• The <CommandElement> will accept a Command, an @action or a (link)
• The <CommandElement> will render the correct HTML element to take care of accessibility