Question

115

Get only specific values in array of objects in JavaScript

rated 0 times [ 120] [ 5] / answers: 1 / hits: 5828 / 4 Years ago, tue, june 23, 2020, 12:00:00

I'm trying to get only two objects in the resultant array with label one and label two.
How do I filter values in an array of objects. Could anyone please help?

const arr = [{

    value: 1,

    label: one

  },

  {

    value: 2,

    label: two

  },

  {

    value: 3,

    label: three

  },

];



arr.map((val, index) => val.filter(val.label => val.label === 'one' && val.label === 'two'))



console.log(arr)

I was expecting an output like this below

[{

    value: "1",

    label: "one"

  },

  {

    value: "2",

    label: "two"

  },

]

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kaitlynnb

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answered 4 Years ago tristab · Accepted Answer

You can check if the label is either "one" or (not and) "two" with just filter (you don't need map).

const arr = [{

    value: 1,

    label: one

  },

  {

    value: 2,

    label: two

  },

  {

    value: 3,

    label: three

  },

];



const res = arr.filter(val => val.label === 'one' || val.label === 'two');



console.log(res)

If there are multiple labels you want to allow, you can use a Set to store them, and use Set#has for filtering.

const arr = [{

    value: 1,

    label: one

  },

  {

    value: 2,

    label: two

  },

  {

    value: 3,

    label: three

  },

  {

    value: 4,

    label: four

  },

  {

    value: 5,

    label: five

  },

  {

    value: 6,

    label: six

  },

  {

    value: 7,

    label: seven

  }

];

const allowedLabels = new Set([one, two, four, seven]);

const res = arr.filter(val=>allowedLabels.has(val.label));

console.log(res)