Highlights of JavaScript — Variables, Switch, and While Loops

Highlights of JavaScript — Variables, Switch, and While Loops

To learn JavaScript, we must learn the basics.

To learn JavaScript, we must learn the basics.

In this article, we’ll look at the most basic parts of the JavaScript language.

Local vs Global Variables

JavaScript has local and global variables.

Local variables are accessible only within a block.

And global variables are available throughout the app.

With JavaScript, we create local variables with the let and const keywords.

They are all block-level, so they’re all only available within a block like functions, and if blocks.

let creates a variable, and const creates constants.

Constants can’t be reassigned a new after it’s assigned a value.

But the content may still change.

Constants must have an initial value assigned to it when it’s created.

For example, if we have:

function addNumbers() {
  let theSum = 2 + 2;

The theSum is only available within the addNumbers function.

But if we have:

function addNumbers() {
  theSum = 2 + 2;

then theSum is a global variable.

We can access the value anywhere.

If a variable is global, then it’s attached property of the window global object.

We should avoid global variables since it’s easy to create global variables with the same name.

Therefore, it’s easy to have conflicts.

And it’s hard to track how variables are changed.

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