How to Remove Null Objects from Nested Array of objects in JavaScript ?

Removing null objects from the nested array of objects can be done by iterating over the array, filtering out the null objects at each level, and then applying a recursive approach to remove all the null objects. This makes sure that all the levels of the nested structure are checked and the null objects are removed.

There are various approaches to Remove Null Objects from a Nested Array of objects in JavaScript

Using every Method

Every method is used to iterate through each level of the nested array. At each level, every method checks if all elements pass a specified condition, excluding null objects, effectively filtering them out.

Syntax:

array.every(callback(element, index, array), thisArg)

Example: The below code uses every method to Remove Null Objects from a Nested Array of objects in JavaScript.

Javascript

// Input arr
let arr = [
      { id: 1, values: [1, 2, 3] },
      { id: 2, values: [null, 5, 6] },
      { id: 3, values: [7, 8, 9] },
      { id: 4, values: [10, null, 12] },
];
// Removing null using every
let output = arr.filter((obj) => {
      return obj.values.every((value) => {
        return value !== null;
  });
});

// Output
console.log(output);

Output

[ { id: 1, values: [ 1, 2, 3 ] }, { id: 3, values: [ 7, 8, 9 ] } ]

Using includes Method

Include method is used to filter out null objects from a nested array. By recursively applying includes to each level of the nested structure, null objects are excluded from the resulting array.

Syntax:

array.includes(searchElement, fromIndex)

Example: The below code uses includes a method to Remove Null Objects from a Nested Array of objects in JavaScript.

Javascript

// Input arr
let arr = [
  { id: 1, values: [1, 2, 3] },
  { id: 2, values: [null, 5, 6] },
  { id: 3, values: [7, 8, 9] },
  { id: 4, values: [10, null, 12] },
];

// Removing null using includes
let output = arr.filter((obj) => {
  return !obj.values.includes(null);
});

// Output
console.log(output);

Output

[ { id: 1, values: [ 1, 2, 3 ] }, { id: 3, values: [ 7, 8, 9 ] } ]

Using reduce Method

This approach uses the reduce method to recursively filter out null objects from a nested array of objects. The reduce function accumulates the non-null objects while traversing through each level of the nested structure.

Syntax:

array.reduce(callback(accumulator, currentValue, currentIndex, array), initialValue)

Example: The below code uses a reduce method to Remove Null Objects from a Nested Array of objects in JavaScript.

Javascript

// Input arr
let arr = [
    { id: 1, values: [1, 2, 3] },
    { id: 2, values: [null, 5, 6] },
    { id: 3, values: [7, 8, 9] },
    { id: 4, values: [10, null, 12] },
  ];

// Removing null using reduce
let output = arr.reduce((acc, obj) => {
    if (!obj.values.includes(null)) {
      acc.push({ ...obj });
    }
    return acc;
  }, []);

// Output
console.log(output);

Output

[ { id: 1, values: [ 1, 2, 3 ] }, { id: 3, values: [ 7, 8, 9 ] } ]