Computed Property for "wrapped items"

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  canCreate: true,
  hasMax: true,
  
  items: [
    { isEnabled: true, name: 'duplicate'},
    { isEnabled: true, name: 'edit'},
  ],

  renderedItems: Ember.computed('items.[]', 'canCreate', 'hasMax', function() {
    const { items, canCreate, hasMax } = this.getProperties('items', 'canCreate', 'hasMax');
    
    return items.map(item => {
      const canNotDuplicate = item.name === 'duplicate' && hasMax;
      const canNotEdit = item.name === 'edit' && !canCreate;
      
      const wrappedItem = Object.assign({
        isDisabled: (!item.isEnabled || canNotDuplicate || canNotEdit)
      }, item);
      
      return wrappedItem;
    });
  }),
  
});

styles.app.css

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

ul, li {
  margin: 0;
  padding: 0;
  list-style: none;
}

li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  border: 1px solid #c8c8c8;
  margin-bottom: .5rem;
}

templates.application.hbs

{{outlet}}

<h1>CP for "wrapped items"</h1>

<ul>
  {{#each renderedItems as |item|}}
     <li>{{item.name}} <small>isDisabled = {{item.isDisabled}}</small></li>
  {{/each}}
</ul>

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}