Get a Unique List of Objects in an Array of Object in JavaScript

00:00 Intro
00:38 Build the array of objects
03:36 Write the one-liner
07:17 Alternate example
08:28 the map() method
10:52 Map object
14:17 Map object key() method
16:42 Map object values() method
17:30 spread syntax
19:08 summary

Learn a 'unique' way (pun intended) to get a distinct list of objects in an array of objects based on a shared key in JavaScript.

Bonus points if you know the name of the YouTube series used in the example.

#JS #JavaScript #vanillaJavaScript

[AmitK]

Awesome !! now tell me, if this is possible in this example below:
[
{
userId: 1,
joinTime: 1234
},
{
userId: 2,
joinTime: 1234
},
{
userId: 1,
joinTime: 1235
},
{
userId: 2,
joinTime: 1236
},
{
userId: 1,
joinTime: 1237
}]
I need to get only unique userId's but with highest number of joinTime
e.g. [
{ userId: 1, joinTime: 1237 },
{ userId: 2, joinTime: 1236 }
}
can we somehow conditionally set new Map to select unique only where joinTime is higher, or may be, we first put all objects of the array in sorting order from lower joinTime to high joinTime and then we put it in new Map .

[shineLouisShine]

Wow, what an tutorial, which I ran into completely by an accident.
I wasn't expected it, and it is amazingly helpful.
I'm very impressed!
Thanks a lot :))

P.S.
Just read your article after following the link at the description.
It clarify few things.
Awesome.

[aengtech]

Thank you. I know how the new Set method work but it gives only unique value not the entire array

[wertwertwy]

typo on your website "spend some to"

But as many code oneliners are, they are a little tricky to understand. So I wanted to spend some to understanding how this worked and thought, you might find this a little interesting too.

[Shiva-Rapol]

what should be done in order to get the first object in the resultant unique array instead of the last ones
?

[misterjaypeasmith]

What’s the effect of using the spread operator in the

let uniqueObjArray = [ … new Map(myObjArray —etc—]

What would happen without that?

[sindhurc]

How to remove duplicates objects in array

[fahadhasan]

I think we can also use Set in place of Map to get unique objects am I correct?

[JustClickApprove]

Instead of copying and pasting, you can highlight the code you want to copy and press alt + shift + down arrow

[swathibaby]

it really help me out thank you too much

[santhiya]

I need one key value from one object.how to do that .my question how to get a particular key vale from object

[devika]

How to store a file content in to a object