Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
What is a block statement in JavaScript?
A block statement groups zero or more statements. In languages other than JavaScript, it is known as a compound statement.
Syntax
Here’s the syntax −
{
//List of statements
}Variables with a block get scoped to the containing function. Block statement never introduce scope and using var to declare variables don’t have block scope.
var a = 20; {
var b = 40;
}Now, when you will print the value of a, it will print 40, not 20. This is because variable declared with a var within the block has the same scope like var before the block.
var a = 20; {
var a = 40;
}
// this prints 40
document.write(a);
Updated on: 15-Jun-2020
564 Views
Advertisements