In JavaScript, 'undefined' and 'null' are distinct but related concepts used to represent absence or emptiness in different scenarios.
- **Undefined:** It signifies a variable that has been declared but has not been assigned a value or not defined within a scope. It's the default value of uninitialized variables.
- **Null:** It's a value that represents the intentional absence of any object value. It is explicitly assigned to variables or properties to indicate no value or empty state.
Key differences:
1. **Implicit vs. Explicit:** 'Undefined' represents an uninitialized variable, while 'Null' signifies an intentional absence of value.
2. **Default vs. Assigned:** 'Undefined' is the default value for uninitialized variables, while 'Null' is explicitly assigned.
Understanding these differences is crucial for proper variable handling in JavaScript.
1. #JavaScriptConcepts
2. #UndefinedVsNull
3. #VariableValues
4. #EmptyValues
5. #ProgrammingBasics
6. #JSDevelopment
7. #VariableAssignment
8. #JavaScriptVariables
9. #TypeComparison
10. #JSFundamentals
