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
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