![]() When used in conditional logic both undefined and null will return false. Hence the simple interest calculation results in NaN. Since t is not assigned a value it is by default given a value of undefined. demonstration of arithmetic operations using undefined and null When used in arithmetic operations, undefined will result in NaN (not a number), whereas null will be converted to 0 behind the screens. We can find the datatypes of both undefined and null using the typeof operator. The data type of undefined is undefined whereas that of null is object. Undefined vs null - the differences 1) Data types: Later, in the program, the value of the variable has been calculated from an expression. Here, in the example above, the variable n is given an initial value of null. demonstrating usage of null in javascript ![]() That must be done programmatically.įor example, when you do not know the value initially you can assign a null to a variable. It can be assigned to a variable as a representation of no value. Here as the variable is declared but not assigned to any value, the variable by default is assigned a value of undefined. ![]() demonstrating usage of undefined in javascript Unassigned variables are initialized by JavaScript with a default value of undefined. undefined is a type by itself (undefined). ![]() Simply put, undefined means a variable has been declared but has not yet been assigned a value. Many times we often get confused on what the difference between UNDEFINED and NULL is. Introduction to undefined and null values Introduction to undefined and null values in Javascript. ![]()
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