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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?
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What is the scope of variables defined inside a function in JavaScript?
What is the scope of variables defined inside a function in JavaScript?
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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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Description
Test your knowledge on JavaScript scope and learn about the concepts of global scope, function scope, and block scope. This quiz will cover topics such as variable accessibility and the use of keywords like let and const in JavaScript.
