Filter array of object from another array

Question

I have two arrays. I want to filter one array which contains objects from another array.

let array1= [{date:1, count:4}, {date:3, count:6}];
let array2= [1,2,3,4];

After filtering these two arrays, I need filtered arrays as below.

let array= [4,0,6,0];

So, the filtered array contains the count for matched date and zero for unmatched values. But I'm getting only matched data.

Here is my code:

let array = _.map(_.filter(array1, function(o){
    return _.includes(array2, o.date);
}), 'count');

Thank you

Nenad Vracar · Accepted Answer · 2017-10-26 09:51:11Z

4

You can use map() and find() methods for this. You don't need filter() because for each element you will return count or 0 so you can just use map().

let array1= [{date:1, count:4}, {date:3, count:6}];
let array2= [1,2,3,4];

var array = array2.map(function(e) {
  var f = array1.find(a => a.date == e);
  return f ? f.count : 0
});

console.log(array)

answered Oct 26, 2017 at 9:51

Nenad Vracar

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