5 Questions
Which keywords were introduced in ES6 to provide Block Scope in JavaScript?
let and const
What is the scope of variables declared with the var keyword?
Global scope
Where can variables declared inside a { } block be accessed from?
Only from outside the block
What happens to local variables in JavaScript when a function is completed?
They are deleted
What is the scope of variables defined inside a function in JavaScript?
Function scope
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.
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.
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