Throw vs Reject

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  rejectMe () {
  	return Ember.RSVP.reject('I rejected');
	},
  resolveMe () {
  	return Ember.RSVP.resolve('I resolved');
	},
  throwMe () {
    return new Ember.RSVP.Promise((resolve, reject) => {
      throw new Error('I threw');
    })
  },
  throwLater (ms) {
    return new Ember.RSVP.Promise(function (resolve) {
      Ember.run.later(this, () => {
        resolve();
      }, ms);
    });
  },

  
  actions: {
   rejector () {
		return this.rejectMe().then(() => {
      alert('Resolved');
    }, (err) => {
       alert(`Rejected, caught in err: ${err}`);
    })
    .catch((err) => {
       alert(`Rejected, caught in catch: ${err}`);
    })
   },
     
   resolveReject () {
		return this.resolveMe()
     .then(this.rejectMe)
     .then(() => {
        alert('Resolved');
      }, (err) => {
         alert(`Rejected, caught in err: ${err}`);
      })
      .catch((err) => {
         alert(`Rejected, caught in catch: ${err}`);
      })
   },
    
   thrower () {
		return this.throwMe().then(() => {
      alert('Resolved');
    }, (err) => {
      alert(`Rejected, caught in err: ${err}`);
    })
    .catch((err) => {
       alert(`Rejected, caught in catch: ${err}`);
    })
   }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<button {{action 'rejector'}}>Chain Rejection</button>
<button {{action 'thrower'}}>Chain Throw</button>
<button {{action 'resolveReject'}}>Resolve then reject</button>

<br>
<br>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}