JavaScript:- Add months to array of object

Question

I have an array of object. Array length is 12. I need to add months to each object, whats the best way to add months

  array = [ {name:"aa"},{name:"bb"}, {name:"cc"}.......].

Result I want

array = [ {monthName: 'January', name:"aa"},{monthName: 'February',name:"bb"}, {monthName: 'March',name:"cc"}............].

Does this answer your question? [Add property to all objects in array](https://stackoverflow.com/questions/36677787/add-property-to-all-objects-in-array) — John Montgomery, Feb 27 '20 at 20:48
Do i need to write each month manually? I am sure using JS we won't need it — developer, Feb 27 '20 at 20:50

score 1 · Answer 1 · answered Feb 27 '20 at 20:51

1

Since the month names are immutable and you already know the array is exactly length 12, simply do it manually, one by one. There are fancier ways to do it but none are as easy to understand or as efficient with resources.

array[0].monthName = 'January';
array[1].monthName = 'February';
array[2].monthName = 'March';
...

answered Feb 27 '20 at 20:51

Benjamin

1,372
2
12
20

No, There should be another way to do it – developer Feb 27 '20 at 20:52
For sure, senior developers wont push my code if I manually write months. I need to add months from Jan to Dec – developer Feb 27 '20 at 20:52

score 1 · Answer 2 · answered Feb 27 '20 at 20:53

1

store all the months in an array months = ['January', 'February', 'March'.....]

loop through your array and match indexes

array.map((x, index) => {
  if(months[index]) {
    x.monthName = months[index];
  }
  return x;
}

answered Feb 27 '20 at 20:53

rbansal

108
2
12

Any other way to do it? – developer Feb 27 '20 at 20:54
I thinks its not good idea to write months, there should be some method like getFullMonth – developer Feb 27 '20 at 20:54
Why? Are you worried that the names of the months will change? Or that they're going to add a new month to the calendar? – Benjamin Feb 27 '20 at 20:55
there is a way like `date.toLocaleString('default', { month: 'long' });` but you will need the date in that case; is that what you are looking for? – rbansal Feb 27 '20 at 20:57

score 1 · Answer 3 · answered Feb 27 '20 at 20:55

1

You can add an array of months and without mutating the array you can create another variable based on your first array and add the month as prop:

let array = [{
  name: "aa"
}, {
  name: "bb"
}, {
  name: "cc"
}];

let months = ["JAN", "FEB", "MAR"]
const res = array.map((el, index) => ({
  name: el.name,
  month: months[index]
}));



console.log(res)

answered Feb 27 '20 at 20:55

Aziz.G

3,599
2
17
35

@developer exactly – Aziz.G Feb 27 '20 at 21:05

score 1 · Answer 4 · edited Feb 27 '20 at 21:42

1

First, you have to declare array which will have month as below array

let month = ['January',February', .... ];

Now you have to iterate source array i.e array and push month property for each object. Code snippets provided below.

array.forEach(element,index)=>{
     element['monthName'] = month[index]
}

edited Feb 27 '20 at 21:42

Ramin eghbalian

2,348
1
16
36

answered Feb 27 '20 at 20:57

Dutt Patel

11
2

vicpermir · Answer 5 · 2020-02-27T21:21:58.550

Define an array of months yourself or get it from a library like moment.js.

This way you are ready to work with dates later if you need much easier. You also get localization (no easy task) and short names if you prefer (e.g. 'Jan' instead of 'January').

var array  = [{name:"aa"}, {name:"bb"}, {name:"cc"}];
var months = moment.months(); // or .monthsShort();

array.forEach((e, idx) => {
   if (months[idx]) e.monthName = months[idx];
});

console.log(array);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment-with-locales.min.js"></script>

Here is the documentation on months() and monthsShort().

JavaScript:- Add months to array of object

5 Answers5