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Questions and Answers
Which keywords were introduced in ES6 to provide Block Scope in JavaScript?
Which keywords were introduced in ES6 to provide Block Scope in JavaScript?
- var and let
- var and const
- let and const (correct)
- const and var
What is the scope of variables declared with the var keyword?
What is the scope of variables declared with the var keyword?
- Local scope
- Block scope
- Function scope
- Global scope (correct)
Where can variables declared inside a { } block be accessed from?
Where can variables declared inside a { } block be accessed from?
- Neither from inside nor outside the block
- Only from outside the block (correct)
- Only from inside the block
- Both from inside and outside the block
What happens to local variables in JavaScript when a function is completed?
What happens to local variables in JavaScript when a function is completed?
What is the scope of variables defined inside a function in JavaScript?
What is the scope of variables defined inside a function in JavaScript?
Flashcards
let and const
let and const
Introduced in ES6, these keywords provide block scope in JavaScript, meaning variables are only accessible within the block they are defined.
Scope of var variables
Scope of var variables
Variables declared with var have global scope, meaning they are accessible from anywhere in the JavaScript code.
Block Scope Access
Block Scope Access
Variables declared inside a block with let or const cannot be accessed from outside that block, due to block scoping.
Local Variable Lifecycle
Local Variable Lifecycle
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Function Scope
Function Scope
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Study Notes
Block Scope in JavaScript
- Introduced in ES6, keywords
letandconstprovide block scope in JavaScript.
Scope of var Keyword
- Variables declared with
varkeyword have a function scope.
Scoped Variables in { } Block
- Variables declared inside a
{ }block can be accessed within that block and its nested blocks.
Lifetime of Local Variables
- Local variables in JavaScript are garbage collected when a function is completed.
Scope of Function Variables
- Variables defined inside a function in JavaScript have a local scope, only accessible within that function.
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