Everything you need to know about JavaScript variables!😁
everything you need to know about JavaScript variables in a nutshell
Hi there, Know that I'm filled with joy having you today! Your presence brings warmth to my heart💓. I will be explaining everything you need to know about JavaScript variable declarators
so let's dive in...
What are Variables?
In JavaScript, variables are used to hold a value. javascript variables can hold any value.
We use either the var
, let,
or const
keywords to declare variables.
for example,
var x;
let y;
const z;
Here, x, y, and z are variables.
JavaScript variable is also simply known as the name of the storage location. That is javascript variable points to a location.
There are two types of variables in JavaScript:
local variable and global variable.
What are JavaScript variable declarators?
From the word "declaration", which means the act of making an official statement about something,
for example
the act of declaring something
"a declaration of love"
Javascript declarators are a statement that declares a variable. Creating a variable in JavaScript is called "declaring" a variable.
examples of javascript variable declarators include:
var keyword variable declarator
let keyword variable declarator
const keyword variable declarator
Declaring a JavaScript Variable
Ways to Declare a Variable in JavaScript are by
Using var
Using let
Using const
Using nothing
You declare a JavaScript variable with the var, the let, and the const keyword:
var myName;
//or
let myName;
After the declaration, the variable has no value (technically it is undefined).
To assign a value to the variable, use the equal sign which brings us to
The Assignment Operator
In JavaScript, the equal sign (=
) is an "assignment" operator, not an "equal to" operator.
Note:
This is different from algebra.
The "equal to" operator is written like
==
in JavaScript.
After the declaration, the variable has no value (technically it is undefined).
To assign a value to the variable, use the equal sign
myName = "Abraham";
You can also assign a value to the variable when you declare it:
let myName = "Abraham";
In the example, we created a variable called myName
and assign the value "Abraham"
to it.
what are JavaScript Identifiers?
There are some rules while declaring a JavaScript variable (also known as identifiers). The name must start with a letter (a to z or A to Z), underscore( _ ), or dollar( $ ) sign.
The general rules for constructing names for variables (unique identifiers) are:
Names can contain letters, digits, underscores, and dollar signs.
Names must begin with a letter.
Names can also begin with $ and _
Names are case-sensitive (y and Y are different variables).
Reserved words (like JavaScript keywords) cannot be used as names.
Hope you enjoyed your reading, Stay tuned! Peace out ✌😎