26th November 2019

mozilla
15

What is a block in JavaScript?

The block statement is often called compound statement in other languages. It allows you to use multiple statements where JavaScript expects only one statement. Combining statements into blocks is a common practice in JavaScript.

Then, what is a block scope?

A variable can be either of global or local scope. A global variable is a variable declared in the main body of the source code, outside all functions, while a local variable is one declared within the body of a function or a block. Modern versions allow nested lexical scoping.

What is a scope in JavaScript?

JavaScript has two scopes – global and local. Any variable declared outside of a function belongs to the global scope, and is therefore accessible from anywhere in your code. Each function has its own scope, and any variable declared within that function is only accessible from that function and any nested functions.

What is functional scope in JavaScript?

A variable can be defined in either local or global scope, which establishes the variables' accessibility from different scopes during runtime. Any defined global variable, meaning any variable declared outside of a function body will live throughout runtime and can be accessed and altered in any scope.
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