Null vs Undefined in JavaScript - Difference Between Them
Learn the difference between null and undefined in JavaScript. Understand their meanings, behavior, and best practices for handling empty or uninitialized values in your code.
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4 Answers
Undefined in JavaScript refers to either a declared variable without a value or an empty property. In order to express no value, null is explicitly assigned.
Undefined in JavaScript refers to either a declared variable without a value or an empty property. In order to express no value, null is explicitly assigned.
null and undefined are two distinct types that represent different values.a variable has been declared but has not yet been assigned a value - this is undefined. And null is an assignment value, meaning that a variable has been declared and given the value of null.
Undefined means a variable has been declared but not assigned a value, and null is a value, that represents the absence of any value.
