Remove duplicates from inside arrays in an object javascript

Question

I have an array of objects... (actually I'm not sure what I have but it looks like this)

list = 

{
"ZIG": [
    "CSK",
    "DKR",
    "CSK",
    "YNA",
    "CSK"
],
"ZKG": [
    "YNA"
],
"ZND": [
    "NIM",
    "DKR",
    "AJY"
],
"ZNE": [
    "PHE",
    "PER"
]
}

And I'm looking for a way to end up with

list = 

{
"ZIG": [
    "DKR",
    "YNA",
    "CSK"
],
"ZKG": [
    "YNA"
],
"ZND": [
    "NIM",
    "DKR",
    "AJY"
],
"ZNE": [
    "PHE",
    "PER"
]
}

I was able to remove most of the duplicates by using uniq but there are still some duplicates

Akrion · Accepted Answer · 2018-11-14 22:10:03Z

1

With ES6 you can do something like this:

const list = { "ZIG": [ "CSK", "DKR", "CSK", "YNA", "CSK" ], "ZKG": [ "YNA" ], "ZND": [ "NIM", "DKR", "AJY" ], "ZNE": [ "PHE", "PER" ] }

const r = Object.entries(list).map(([k,v]) => ({[k]: Array.from(new Set(v))}))

console.log(...r)

Where you would get the entries of the object (via Object.entries) map each of it and then compose the new values via using new Set. Lastly just spread the resulting array to get the desired object result.

edited Nov 14, 2018 at 22:10

answered Nov 14, 2018 at 22:04

Akrion

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