Javascript: Push an object into an array inside another array by internal array's key

Question

I have a months array that has 12 dynamically created objects for the next 12 months

 months = [
    {2020-02: Array(0)}
    {2020-03: Array(0)}
    {2020-04: Array(0)}
    {2020-05: Array(0)}
    {2020-06: Array(0)}
    {2020-07: Array(0)}
    {2020-08: Array(0)}
    {2020-09: Array(0)}
    {2020-10: Array(0)}
    {2020-11: Array(0)}
    {2020-12: Array(0)}
    {2021-01: Array(0)}
    ];

I want to insert an object into the object's array based on a dynamic key that is based on another array (source data).

I loop through the source data and each object in the source data's array has a key of media_date and value of 2020-02;

I then create an object to insert into the months array

var person = new Object();
person.title = 'job title';
person.name = 'cool name';

I want to insert the person object into the months array into the object with the key of 2020-02

I tried something like:

$.each(source,function(i,data){
    var person = new Object();
    person.title = data.job_title;
    person.name = data.name;
  var key = data.monthyear (2020-02)
  months.[key].push(person);
});

But I get

TypeError: Cannot read property 'push' of undefined at...

Thanks for any help you can give!

months[key].push(person);, you don't need the '.' (dot) between months and your key — KDani-99
– KDani-99, Commented Feb 27, 2020 at 16:54
syntax error months.[key] and keys with hypen is not a good idea change to "2021-01" or 2020101 — David
– David, Commented Feb 27, 2020 at 16:55

thinparfiet · Accepted Answer · 2020-02-27 17:39:00Z

1

Assuming that the months array is:

months = [
{'2020-02': Array(0)},
{'2020-03': Array(0)},
{'2020-04': Array(0)},
{'2020-05': Array(0)},
{'2020-06': Array(0)},
{'2020-07': Array(0)},
{'2020-08': Array(0)},
{'2020-09': Array(0)},
{'2020-10': Array(0)},
{'2020-11': Array(0)},
{'2020-12': Array(0)},
{'2021-01': Array(0)}
];

findMonth = '2020-02';

use one of the following to find the position of the wanted object:

index = months.findIndex(x => Boolean(x[findMonth]))
index = months.findIndex(x => Object.keys(x)[0] === findMonth)

then use the following to push at the value of the key months[index][findMonth].push(person)

edited Feb 27, 2020 at 17:39

answered Feb 27, 2020 at 17:14

thinparfiet

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