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Questions and Answers
What does 'scope' refer to in JavaScript?
What does 'scope' refer to in JavaScript?
Which scope has the widest accessibility?
Which scope has the widest accessibility?
A variable declared inside a function is considered to have which kind of scope?
A variable declared inside a function is considered to have which kind of scope?
What is a block-scoped variable?
What is a block-scoped variable?
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If you declare a variable with const keyword inside an if statement block, where is it accessible?
If you declare a variable with const keyword inside an if statement block, where is it accessible?
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What happens when you try to access a block-scoped variable outside of its block?
What happens when you try to access a block-scoped variable outside of its block?
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Where are globally declared JavaScript variables accessible?
Where are globally declared JavaScript variables accessible?
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It is generally best practice to do what with global variables?
It is generally best practice to do what with global variables?
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Study Notes
Scope in JavaScript
- Scope defines where variables and functions are accessible
- Types of scopes:
- Global scope: Variables/functions are accessible throughout the entire program
- File/Module scope: Accessible only within the file/module
- Function scope: Accessible only within the function where it's defined
- Block scope: Accessible only within the block of code where it's defined (using
letorconst)
Block Scoped Variables
-
constandletvariables are block-scoped - They are only accessible within the block of code where they are declared (including nested blocks)
- Trying to access a block-scoped variable outside its block will result in a
ReferenceError
Global Variables
- Variables declared outside of blocks or functions are global
- Accessible throughout the entire program
- Best practice to minimize global variables for better code organization and management
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Description
Test your understanding of scope in JavaScript, including global, function, and block scopes. This quiz covers key concepts like accessibility of variables and best practices for using global variables. See how well you know these fundamental aspects of JavaScript programming.
