Question

176

filter objects from array that have the same value at given key

rated 0 times [ 183] [ 7] / answers: 1 / hits: 15639 / 7 Years ago, fri, september 1, 2017, 12:00:00

Let's say we have an array that looks like this:

[

    {

        id: 0,

        name: 'A'

    },

    {

        id: 1,

        name:'A'

    },

    {

        id: 2,

        name: 'C'

    },

    {

        id: 3,

        name: 'B'

    },

    {

        id: 4,

        name: 'B'

    }

]

I want to keep only this objects that have the same value at 'name' key. So the output looks like this:

[

    {

        id: 0,

        name: 'A'

    },

    {

        id: 1,

        name:'A'

    },

    {

        id: 3,

        name: 'B'

    },

    {

        id: 4,

        name: 'B'

    }

]

I wanted to use lodash but I don't see any method for this case.

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answered 7 Years ago yulissamirandah · Accepted Answer

You can try something like this:

Idea:

Loop over the data and create a list of names with their count.

Loop over data again and filter out any object that has count < 2

var data = [{ id: 0, name: 'A' }, { id: 1, name: 'A' }, { id: 2, name: 'C' }, { id: 3, name: 'B' }, { id: 4, name: 'B' }];



var countList = data.reduce(function(p, c){

  p[c.name] = (p[c.name] || 0) + 1;

  return p;

}, {});



var result = data.filter(function(obj){

  return countList[obj.name] > 1;

});



console.log(result)