What is the output of typeof null?

What is the output of typeof null?

In JavaScript null is “nothing”. It is supposed to be something that doesn’t exist. Unfortunately, in JavaScript, the data type of null is an object. You can consider it a bug in JavaScript that typeof null is an object.

How do you know if a value is null?

In general, null and undefined both mean the same thing: “something’s missing”. For predictability, you need to check both values. And then == null does a perfect job, because it covers exactly those 2 values. (i.e. == null is equivalent to === null && === undefined )

What is null and undefined in JavaScript?

undefined is a type by itself (undefined). Here as the variable is declared but not assigned to any value, the variable by default is assigned a value of undefined. On the other hand, null is an object. It can be assigned to a variable as a representation of no value. JavaScript never sets a value to null.

What is a null in JavaScript?

The JavaScript specification says about null : null is a primitive value that represents the intentional absence of any object value. If you see null (either assigned to a variable or returned by a function), then at that place should have been an object, but for some reason, an object wasn’t created.

How do you define null in JavaScript?

‘Null’ in JavaScript ‘Null’ is a keyword in JavaScript that signifies ‘no value’ or nonexistence of any value. If you wish to shred a variable off its assigned value, you can simply assign ‘null’ to it. Besides this, like any other object, it is never implicitly assigned to a variable by JavaScript.

What is a null variable in JavaScript?

Can JavaScript object be null?

What is null in JavaScript with example?

In JavaScript, null is a special value that represents an empty or unknown value. For example, let number = null; The code above suggests that the number variable is empty at the moment and may have a value later.

Should you use null in JavaScript?

Only use null if you explicitly want to denote the value of a variable as having “no value”. As @com2gz states: null is used to define something programmatically empty. undefined is meant to say that the reference is not existing. A null value has a defined reference to “nothing”.