Omit specific keys from array of objects if the value is NULL [duplicate]

Question

I have this array:

[
  {
    "name": "Homer Simpson",
    "age": "43",
    "start_time": null,
    "end_time": null
  },
  {
    "name": "Bart Simpson",
    "age": "14",
    "start_time": "2023-11-10T20:08:10Z",
    "end_time": "2023-11-10T20:08:10Z"
  }
];

How do I omit the start_time and end_time from each object if the value is NULL? I would like to end with this array:

[
  {
    "name": "Homer Simpson",
    "age": "43"
  },
  {
    "name": "Bart Simpson",
    "age": "14",
    "start_time": "2023-11-10T20:08:10Z",
    "end_time": "2023-11-10T20:08:10Z"
  }
];

I know I can loop through each object and push into a new array with the omitted values if the time values are null, but is there a more concise way of doing it? Is there a way I can use Array.filter?

Yaroslavm · Accepted Answer · 2023-11-10 20:23:05Z

1

Simple way to do this is to use mapping with lodash pickBy function.

It's a bit shorter and more elegant than using reduce.

Reference

import {map, pickBy} from 'lodash';

const data = [
  {
    "name": "Homer Simpson",
    "age": "43",
    "start_time": null,
    "end_time": null
  },
  {
    "name": "Bart Simpson",
    "age": "14",
    "start_time": "2023-11-10T20:08:10Z",
    "end_time": "2023-11-10T20:08:10Z"
  }
];

const result = map(data, obj => pickBy(obj, (value, key) => value !== null));

answered Nov 10, 2023 at 20:23

Yaroslavm

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