Truncate Text Helper

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle'
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{truncate-text "lorem ipsum dolor" limit=5}}
<br>
<br>

helpers.truncate-text.js

import Ember from 'ember';

export function truncateText(params, hash) {
  var value = params[0];
  var len = hash.limit;
  var out = '';

  if (value !== undefined) {
    out = value.substr(0, len);

    if (value.length > len) {
      out += '...';
    }

  } else {
    out = '';
  }

  return out;
}

export default Ember.Helper.helper(truncateText);

twiddle.json

{
  "version": "0.4.17",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}