How to selectively insert keys to an object inside an array of objects based on condition like whether the value array is empty or not in Node.js

Question

Here is the sample code block where I am inserting an object to an array of object through push method :

let sent_by;
let timestamp;
let txt;
let all_links = [];
let all_images = [];

data_object['messages'].push({
'sent_by' : sent_by,
'timestamp' : timestamp,
'content' : txt,
'links' : all_links,
'images' : all_images
})

How can I stop inserting the keys - content (string) , links (array) or images (array) to the array of objects when they are empty effectively in Node.js.

Valentin Briand · Accepted Answer · 2020-11-16 20:29:59Z

2

You can use the spread operator to conditionally add an element:

data_object["messages"].push({
  sent_by: sent_by,
  timestamp: timestamp,
  ...(txt && { content: txt }),
  ...(all_links.length > 0 && { links: all_links }),
  ...(all_images.length > 0 && { images: all_images })
});

answered Nov 16, 2020 at 20:29

Valentin Briand

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Comments

ricardo-dlc · Accepted Answer · 2020-11-16 20:31:12Z

0

Use a simple if statement in your control structure:

if (txt && links.length && all_images.length) {
  data_object['messages'].push({
  'sent_by' : sent_by,
  'timestamp' : timestamp,
  'content' : txt,
  'links' : all_links,
  'images' : all_images
  })
}

Only those elements who have the 3 props, will be pushed to the array

edited Nov 16, 2020 at 20:31

answered Nov 16, 2020 at 20:27

ricardo-dlc

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2 Comments

coolsaint Over a year ago

There could be other conditions like txt is present but others are not present or any one of them is present.

ricardo-dlc Over a year ago

Ok I got it, I missunderstood you. If thats the case, the other answer could be helpful

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