Difference between Null and Undefined
Null is used to represent an intentional absence of value. It represents a variable whose value is undefined. It accepts only one value, which is null. The Null keyword is used to define the Null type in TypeScript, but it is not useful because we can only assign a null value to it.
Null vs. Undefined
The important difference between Null and Undefined are:
||It is an assignment value. It can be assigned to a variable which indicates that a variable does not point any object.
||It is not an assignment value. It means a variable has been declared but has not yet been assigned a value.
||It is an object.
||It is a type itself.
||The null value is a primitive value which represents the null, empty, or non-existent reference.
||The undefined value is a primitive value, which is used when a variable has not been assigned a value.
||Null indicates the absence of a value for a variable.
||Undefined indicates the absence of the variable itself.
||Null is converted to zero (0) while performing primitive operations.
||Undefined is converted to NaN while performing primitive operations.