Collect.js whereNotNull Method

The whereNotNull() method is used to return a collection that does not contain any null values. In simple words, it filters the values that are not null.

Installation:

• In NodeJs:

  npm install collect.js

• CDN for collect.js

  <script src="https://cdnjs.com/libraries/collect.js"></script>

Syntax:

whereNotNull(key if any)

Parameters: It takes the key of the element in an object.

Return Value: It returns the object.

Example 1:

Javascript

// Importing the collect.js module.
const collect = require('collect.js');

let obj1 = [{ "a": null }, { "a": 3 },
    { "b": null }, { "b": 33 }, { "a": null }];

// Making a collection
let collection = collect(obj1);

// Filtering the null values;
let collectionFilter = collection.whereNotNull("a");

// Printing the original collection
console.log("Original collection is: ", collection.all())
console.log("filter only key \"a\" for null values")
console.log("Filtered collection is: ",
        collectionFilter.all());

Output:

Example 2:

Javascript

// Importing the collect.js module.
const collect = require('collect.js');
let obj1 = [1, 2, null, null, 5];

// Making a collection
let collection = collect(obj1);

// Filtering the null values;
let collectionFilter = collection.whereNotNull();
console.log("Original collection is: ",
            collection.all())

console.log("Filtered collection is: ",
            collectionFilter.all());

Output:

Reference: https://collect.js.org/api/whereNotNull.html