Questions and Answers
Which keyword is now preferred for variable declaration in JavaScript?
let
Where can a variable declared with var be accessed?
Within the function it is declared in
What is hoisting in JavaScript?
The process of moving variables and function declarations to the top of their scope before code execution
What is the scope of a variable declared with let?
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Can a let variable be re-declared within its scope?
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Study Notes
Variable Declaration in JavaScript
-
letis the preferred keyword for variable declaration in JavaScript.
Variable Scope with var
- A variable declared with
varcan be accessed from anywhere in the script, including outside the block it was declared in.
Hoisting in JavaScript
- Hoisting is a JavaScript mechanism where variable declarations are moved to the top of their scope, regardless of where they are actually declared.
- This means that a variable can be used before it is declared, but its value will be
undefineduntil it is actually declared.
Variable Scope with let
- The scope of a variable declared with
letis limited to the block it was declared in (e.g.,if,for,while,function, etc.).
RedDeclaring let Variables
- A
letvariable cannot be re-declared within its scope.
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