Agregar categoría sencilla

subcategory_simple.js

var results = [
  {
    "id": 3,
    "soft_delete": false,
    "name": "Bebidas frias",
    "order": 1,
    "menu": 1,
    "sub_category": 2
  },
  {
    "id": 1,
    "soft_delete": false,
    "name": "Pastas",
    "order": 1,
    "menu": 1,
    "sub_category": null
  },
  {
    "id": 2,
    "soft_delete": false,
    "name": "Bebidas",
    "order": 3,
    "menu": 1,
    "sub_category": null
  }
]

results = results.filter( result => {
   if(!result.sub_category){
     result.sub_category = results.filter(f => f.sub_category == result.id )
     return result
   }
 })