append to an array as a value in an object

Question

i am returning a structure of an object of folders and the contents of the json files contained in them. this is how it's looks like.

{
  DailyTask: [ { title: 'Chores', body: 'Wash the roof and sweep the bed' } ],
  monday: [{ title: 'madrid', body: 'Wash the roof and sweep the bed' }  ],
}

i have a problem when a folder has more than two files, because i can't find a way to append to the array of either monday or DailyTask

i tried doing concat or push but they wouldn't work at first because the object property is undefined so i did the first assignment would be done via square brackets and subsequent ones will be done via push or unshift i.e x is the json file

if (sum[key] == undefined) {
            sum[key] = x;
        } else {
            sum[key].unshift(x);
        }

gives me this

{
  DailyTask: [ { title: 'Chores', body: 'Wash the roof and sweep the bed' } ],
  monday: [
    [ [Object] ],
    { title: 'madrid', body: 'Wash the roof and sweep the bed' }
  ]
}

it shows as [[Object]], how do i make the actual contents of the object show.

Ciao, so you want create a unique array that contains both objects { title: 'Chores', body: 'Wash the roof and sweep the bed' } and { title: 'madrid', body: 'Wash the roof and sweep the bed' } correct? — Giovanni Esposito
– Giovanni Esposito, Commented Aug 9, 2020 at 13:44
@Sascha the first code block and the last code block are the results — Nathaniel Babalola
– Nathaniel Babalola, Commented Aug 9, 2020 at 13:48
@GiovanniEsposito i want to add more of the format { title: 'XXXXX', body: 'Do something xxxxxxx' } — Nathaniel Babalola
– Nathaniel Babalola, Commented Aug 9, 2020 at 13:49
yourObject.monday.push({title:"foo"}); should work. Provide a jsfiddle of your issue. — John
– John, Commented Aug 9, 2020 at 13:53

fedesc · Accepted Answer · 2020-08-09 14:38:28Z

1

From the logic you are presenting x equals [ {...} ]. that is why it works for

sum[key] = x;
// outputs:
// title: [ { ... } ]

But fails on the other: title: [ [{...}], {...} ]

try this:

if (sum[key] == undefined) {
  sum[key] = [x[0]] ; // or simply leave it x;
} else {
  sum[key].unshift(x[0]);
}

edited Aug 9, 2020 at 14:38

answered Aug 9, 2020 at 13:57

fedesc

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2 Comments

Nathaniel Babalola Over a year ago

you misunderstood me, i am pushing an object of format { title: 'XXX', body: 'bla bla bla bla' } not title: [ [{...}], {...} ]

fedesc Over a year ago

but that's exactly the output you are getting. [[ [Object] ],{ title: 'madrid', body: 'Wash the roof and sweep the bed' }]. my offered solution doesn't work still?

iAmOren · Accepted Answer · 2020-08-09 13:57:53Z

0

if(sum[key]==undefined) sum[key]=[x];
else sum[key].push(x);

answered Aug 9, 2020 at 13:57

iAmOren

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2 Comments

Nathaniel Babalola Over a year ago

this doesn't work , the subsequent pushed objects show as [ [Object] ]

iAmOren Over a year ago

Doesn't make sense to me. What is x? console.log it and see if it's something like this: {"title":"something", "body":"something else"}.

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