Stackoverflow question:4258264

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Stackoverflow question:4258264',
	emailAddress: '',
  message: '',

  //**original properties**
  isValid: Ember.computed.match('emailAddress', /^.+@.+\..+$/),//starts as false
  
  validMessage: Ember.computed.gte('message.length', 5),//starts as false

  //**my reversing boolean properties**
  notYet: Ember.computed.not('isValid'),//starts as true
  notNow: Ember.computed.not('validMessage'),//starts as true


	//isDisabled must be true to be active disabling button
  isDisabled: Ember.computed.or('notYet', 'notNow'),//starts as true})

  originalPropsAnded: Ember.computed.and('isValid', 'validMessage'),//starts as false})
	isDisabledNoted: Ember.computed.not('isDisabled')
})

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}

Email: {{input value=emailAddress}}
<br><br>
Message: {{input value=message}}
<br><br>
isValid: {{isValid}}
<br><br>
validMessage: {{validMessage}}
<br><br>
notYet: {{notYet}}
<br><br>
notNow: {{notNow}}
<br><br>
isDisabled: {{isDisabled}}
<br><br>
originalPropsAnded: {{originalPropsAnded}}
<br><br>
isDisabledNoted: {{isDisabledNoted}}

twiddle.json

{
  "version": "0.11.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.2",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.10.2",
    "ember-testing": "2.10.2"
  },
  "addons": {}
}