attribute boolen binding

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  actions: {
    didClick() {
      this.toggleProperty('borderBottom');
    }
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{my-component borderBottom=borderBottom}}
<br>
<button onclick={{action "didClick"}}>Toggle</button> {{borderBottom}}
<br>

my-component.component.js

import Ember from 'ember';
const { Component, computed } = Ember;

export default Component.extend({
  attributeBindings: ['borderBottomAttr:md-border-bottom'],
  borderBottomAttr: computed('borderBottom', function() {
    return this.get('borderBottom') ? true : null;
  })
});

my-component.template.hbs

{{yield}}

twiddle.json

{
  "version": "0.6.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "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/2.4.3/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.3/ember-template-compiler.js"
  }
}