get only the unique value of an array

Question

I am new to javascript and I tried like using distinct but its not what im looking for

example array:

let arr = [ {key:\"1\",value:\"dog\"},
                 


        

Answer 1

You can map your objects to stringified versions of your objects so you can then use .indexOf and .lastIndexOf() to compare if the object found appears in different locations in your array, if the last and first index appear in the same location then it can be said that they're the same object (ie: a duplicate doesn't exist) and can be kept in your resulting array like so:

const arr = [{key:"1",value:"dog"},{key:"1",value:"dog"},{key:"2",value:"cat"},{key:"3",value:"bird"},{key:"3",value:"bird"}];

const searchable = arr.map(JSON.stringify);
const res = arr.filter((obj, i) => {
  const str = JSON.stringify(obj);
  return searchable.indexOf(str) === searchable.lastIndexOf(str);
});
console.log(res);