Remove duplicate objects from array always returning nth index

Question

Is there a way to remove dupilicates making sure that the nth index is always left. So if I have

[{name: "john", age:20},{name:"john", age:30}]

I would need the result to always be

[{name:"john",age:30}]

currently, I'm using this method of removing dups

  PICKER.saveSelection = PICKER.saveSelection.filter((select, index, self) => {
 return self.map(function(mapItem){ return mapItem["category"]; }).indexOf(select["category"]) === index;});

Eddie · Accepted Answer · 2018-06-29 17:53:09Z

4

You can use reduce and group the array into an object using the name as the key. Use Object.values to convert back the object into an array.

var arr = [
      {name: "john", age:20},
      {name:"john", age:30},
      {name:"adam", age:30},
      {name:"eddie", age:27}
];

var result = Object.values(arr.reduce((c, v) => Object.assign(c, {[v.name]: v}), {}));

console.log(result);

answered Jun 29, 2018 at 17:53

Eddie

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