null however represents normal, expected absence of value and if there is no value, the value of variable can be set to null. The main difference between them is that undefined represents unexpected absence of value and the value of a variable should not be set to undefined.

To distinguish them the strict equality operator (=) should be used. They are considered equal by the equality operator (=): console.log(null = undefined) // true Null and undefined are similar and both mean an absence of value. You can consider it a bug in JavaScript that typeof null is an object. Unfortunately, in JavaScript, the data type of null is an object. there is no data available to calculate amount and null is set It is supposed to be something that doesn't exist. null is not an identifier for a property of the global object, like undefined can be. Try it Syntax null Description The value null is written with a literal: null. It is one of JavaScript's primitive values and is treated as falsy for boolean operations. If a variable is meant to later hold an object it is recommended to initialise it to null.Īlso when an object, string or number is expected and is not available, instead of it null can be used. The null value represents the intentional absence of any object value. It can be considered as an empty object pointer. The null indicates absence of value, no value for objects, numbers and strings. Well explain the concept of null values and how to use them in your code. Null type has also only one value that is the special value null. Learn how to check for null values in Javascript with this easy to follow guide.

Javascript null