Read a field from every array object

Question

I have a JSON file that returns this :

{
  "id": 1,
  "name": "",
  "lastName": "",
  "birthDate": "",
  "invoice": [
    {
      "id": 1,
      "date": "20/10/2015"
    },
    {
      "id": 2,
      "date": "20/8/2013"
    },
    {
      "id": 3,
      "date": "20/6/2012"
    }
  ]
}

if I access invoice[0].date I will get "20/10/2015".

I need to save in an array all three dates in this case, so that I can show it in a dropdown. <select> option should have all three dates.

How do I save and access those in JavaScript?

var allDates=data.info[all arrays].date // date field of every object

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map — juvian, Oct 17 '17 at 21:37
You JSON was still not valid, so I edited it and corrected it according to a few assumptions. — Sebastian Simon, Oct 17 '17 at 22:09

score 2 · Accepted Answer · answered Oct 17 '17 at 21:40

2

I'd use Array.map() for this - it executes a function against every element of an array and makes a new array from the results. So you can do this:

function toDate( item ) {
   return item.date;
}
var allDates = info.map( toDate );

answered Oct 17 '17 at 21:40

Duncan Thacker

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Thank you soo much!!! This is just what I needed! – MonnIca Oct 17 '17 at 21:56
No problem - good luck with your project! – Duncan Thacker Oct 17 '17 at 21:59

Read a field from every array object

1 Answers1