Example of initialization of value on component render

components.example-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: "component",
  
  countWas7: false,
  
  init() {
    this._super(...arguments);
    if (this.count == 7) {
      this.set('countWas7', true); 
    }
  }
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

.component {
  padding: 10px;
  border-radius: 5px;
  border: 1px solid black;
  margin: 10px;
}

templates.application.hbs

{{example-component count=7}}
{{example-component count=8}}

templates.components.example-component.hbs

<h2>Example Component</h2>
<h4>Count:</h4>
<div>{{count}}</div>

<h4>Count was 7 on initialization:</h4>
<div>{{countWas7}}</div>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}