JavaScript Var

Var is a keyword that is used to declare a variable.

But, you should NOT use var, use let when declaring a variable.

One of the most important things is that you should try to keep things simple!


When Should You Use

When Should You Use var, const Or let?

It is important to understand Global-Scope, Function-Scope and Block-Scope to know when you may use the different statements.

Global Scope

Variables declared Globally (outside any block or function) have Global Scope.

Be careful with using Global Scope.

var car = "Byton";
 
// code CAN use variable car
 
function carFunction() {
     // code CAN also use variable car 
}

Function Scope

Variables declared inside a function have Function Scope.

// code can NOT use variable car
 
function carFunction() {
     var car = "Byton";
     // code CAN use variable car
}
 
// code can NOT use variable car

Block Scope

Variables declared inside a block {} have Block Scope.

{ 
     var car = "Byton"; 
}
// code CAN use variable car

Learn more about JavaScript Variables Learn more about JavaScript Scope

Var variables are not restricted to a scope

var variables are NOT restricted to a specific scope!

Previous example shows that the scope of var variables are dependent on where they are declared.

To keep things simple - Use let to define a variable.


Learn more about JavaScript Let Learn more about JavaScript Const
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JavaScript is one of the 3 core language technologies of the World Wide Web that all web developers must learn:

1.      HTML to define the content of web pages.

2.      CSS to specify the layout of web pages.

3.      JavaScript to program the behavior of web pages.

JavaScript is a scripting or programming language that allows you to implement complex things on web pages. Every time a web page does more than just sit there and display static information for you to look at, displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. − you can bet that JavaScript is probably involved.


The benefits of using JavaScript are:

1.      You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.

2.      Immediate feedback to the visitors − They don't have to wait for a page reload to see if they have forgotten to enter something.

3.      Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.

4.      Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.


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