How to use filter array of objects by 2 conditions with an arrow function in js? [duplicate]

Question

Suppose I have an array like:

  const items=[{
        "taskType": "type2",
        "taskName": "two",
        "id": "19d0da63-dfd0-4c00-a13a-cc822fc81298"
      },
      {
        "taskType": "type1",
        "taskName": "two",
        "id": "c5385595-2104-409d-a676-c1b57346f63e"
      }]

I want to have an arrow (filter) function that returns all items except for where taskType=type2 and taskName=two. So in this case it just returns the second item?

Possible duplicate of Filter array of objects by multiple properties and values and Filter with two arguments\parameters — adiga
– adiga, Commented Feb 19, 2019 at 8:16
Maybe the following answer can help you implement the filter in a re usable way and gradually apply filters. — HMR
– HMR, Commented Feb 19, 2019 at 8:34

Mamun · Accepted Answer · 2019-02-19 08:42:58Z

3

You can try negating the condition in Array.prototype.filter()

const items=[{
        "taskType": "type2",
        "taskName": "two",
        "id": "19d0da63-dfd0-4c00-a13a-cc822fc81298"
      },
      {
        "taskType": "type1",
        "taskName": "two",
        "id": "c5385595-2104-409d-a676-c1b57346f63e"
      }]

var res = items.filter(task => !(task.taskType == 'type2' && task.taskName == 'two'));

console.log(res);

edited Feb 19, 2019 at 8:42

answered Feb 19, 2019 at 8:16

Mamun

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Comments

Ori Drori · Accepted Answer · 2019-02-19 09:38:29Z

2

You can use lodash's _.reject(). Use an object as a predicate, and define the properties and values to reject by:

const items= [{
  "taskType": "type2",
  "taskName": "two",
  "id": "19d0da63-dfd0-4c00-a13a-cc822fc81298"
},
{
  "taskType": "type3",
  "taskName": "two",
  "id": "19d0da63-dfd0-4c00-a13a-cc822fc81298"
},
{
  "taskType": "type1",
  "taskName": "two",
  "id": "c5385595-2104-409d-a676-c1b57346f63e"
}]

const result = _.reject(items, { taskType: "type2", taskName: "two" });

console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

edited Feb 19, 2019 at 9:38

answered Feb 19, 2019 at 8:19

Ori Drori

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2 Comments

bier hier Over a year ago

and taskName=two?

Ori Drori Over a year ago

I've updated the example. You just need to add whatever properties you want to reject by to the predicate object,

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