How to destructure an object and get values of one key in javascript?

Question

Below is the json data that'd I'd like destructure and extract just the title values.

 [{
        "id": 1,
        "title": "Python Crash Course",
        "author": "Eric Matthes",
        "quantity": 5
      },
      {
        "id": 2,
        "title": "Head-First Python",
        "author": "Paul Barry",
        "quantity": 2
      }
    ]

Answer 1

Getting specific properties of objects inside an array does not need destructuring. This can be done with Array.prototype.map:

jsonArray.map(object => object.title);
// results in ["Python Crash Course", "Head-First Python"]

If you really want to use destructuring, you could change the function provided to map to only select the title:

jsonArray.map(({title}) => title);
// results in ["Python Crash Course", "Head-First Python"]

Answer 2

If this is an array of objects and it's in the file (not as an external file) then,

const arrayObj = [
   {
    "id": 1,
    "title": "Head-First Python",
    "author": "Paul Barry",
    "quantity": 1
  },
  ...
]

const {title} = arrayObj[0]
console.log(title) //Head-First Python

That will give you the value of one object in the array. To get all the 'title' properties you could loop through the array.

arrayObj.forEach(el => {
   let {title} = el
})