New Twiddle

components.material-toast.js

import Ember from 'ember';

const { run: { later } } = Ember
//alternative would be to just use Ember.run.later for ES5
//based on what version of javascript your codebase uses

export default Ember.Component.extend({
  
  displayed: false,
  msg: '',
  lifetime: 1, // in seconds
  
  didUpdateAttrs(...args){
    this._super(args)
    const runAt = this.get('lifetime') * 1000
    later(()=>{
      this.set('displayed',false)
    },runAt)
  },
  
  actions: {
   	dismiss(){
      this.set('displayed',false)
    }
  }
  
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  name: 'World',
  operationStatus: '',
  operationDone: false,
  actions: {
    startOperation(){
      //do operation here, save model, server call, etc
      this.set(
        'operationStatus',
        'Hello, ' + this.get('name') + '! Your name was succesfully updated to: '
      )
      this.set('operationDone',true)
    }
  }
});

templates.application.hbs

{{material-toast msg=operationStatus displayed=operationDone}} 
<label>Name:</label>
{{input value=(mut name)}}
<button {{action 'startOperation'}}>Start Operation</button>

templates.components.material-toast.hbs

{{#if displayed}}
	{{!-- You can either {{yield}} here or
  			just put your toast component here and send data down to it
  --}}
	{{msg}}
{{/if}}

twiddle.json

{
  "version": "0.7.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember-template-compiler.js"
  }
}