How to count unique value from object of array in javascript

Question

I want to calculate number of unique value and put that in new array. I have below array:

[
  { CategoryId: \"b5c3f43f941c\", CategoryName: \"Category 1\", Categ         


        

Answer 1

const array_unique = require('array-hyper-unique').array_unique

let arr = [
  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }
  { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }
  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }
]

array_unique(arr).length