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Js reduce to get the count of the objects

Arun Kumar's photo
Arun Kumar
·Dec 16, 2019

Hi Team,

I'm trying to get the count/frequency/Groupby of an array of objects. Using reduce I'm getting only one key and it's count using below code. However, I'd like to get the whole object with the frequency/count added to the object. Any idea on how to modify the below code to acheive this?

var data = [{
  title: 'monk',
  rating: 2,
  price: 199
}, {
  title: 'monk',
  rating: 2,
  price: 199
}, {
  title: 'Gods Vs Geeks',
  rating: 2,
  price: 199
}];

var result2 = data.reduce(function(r, e) {
  r[e.title]= (r[e.title] || 0) + 1;
  return r;

}, {});

console.log(result2)

Result: {monk: 2, Gods Vs Geeks: 1}

Below is the format in which I want to get the data:

 [{
  title: 'monk',
  rating: 2,
  price: 199,
count: 2},
{
  title: 'Gods Vs Geeks',
  rating: 2,
  price: 199,
count:1
}]
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