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JavaScript Scope

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Questions and Answers

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?

Local scope

Block scope

Function scope

Global scope (correct)

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?

<p>They are deleted</p> Signup and view all the answers

What is the scope of variables defined inside a function in JavaScript?

<p>Function scope</p> Signup and view all the answers

Study Notes

Block Scope in JavaScript

Introduced in ES6, keywords let and const provide block scope in JavaScript.

Scope of `var` Keyword

Variables declared with var keyword 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.