Javascript Tutorial - Javascript Variable & Javascript Data Type | Basic of Javascript Data Types
Javascript Tutorial - JS Variable & Javascript Data Type | Basic of Javascript Variable & Data Type
Javascript variable is a container for storing data values. In javascript programming, language variable identifies with a unique name. In javascript variable containing which hold reusable data means once you assign a specific literal type to a variable, you can latter reassign the variable you can later assign the variable to host any other type, without type error or any issue.
Variable names are known as identifiers in JavaScript.
Javascript variable is declared with the var keyword.
Like var firstName;
You can declare multiple variables with the same var keyword as following
Var firstName, lastName, age, country;
Javascript Variable Scope
The Javascript variable has two types of scopes
Global Variable
Local Variable
There are some roles for declaring a Javascript Variable
1. Javascript Variable Name can contain letters, digits, dollar sign.
2. Javascript variable name being with a letter.
3. Javascript variable name can also begin with $ and _.
4. Javascript variable name is case sensitive
5. Javascript reserved words cannot be used as a variable name like function, if, else, array.
You use variables as symbolic names for values in your application. The names of variables, called identifiers, conform to certain rules.
A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be digits (0-9). Because JavaScript is case sensitive, letters include the characters "A" through "Z" (uppercase) and the characters "a" through "z" (lowercase).
Learn Javascript Basic, Javascript Tutorial.
Javascript Language Basic
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javascript Variable and Data Type
Javascript Variable is a fundamental concept of every programming language.
We can define a Javascript Variable, like a container. In which we can store a value in order to use it.
JavaScript Data Type
Number: Floating point numbers, for decimals and integers.
String: Sequence of characters, used for text.
Boolean: Logical data type that can only be true or false. (Its provide on logical values like the statement is true or false)
Undefined: Datatype of a variable that does not have a value yet.
Null: Also means ‘no existent’
Break Role of Variable Define
1. We can not start a variable with a number like
Var 3year = 3;
2. We can not use the symbol in middle for defining variable name like var john/mark = ‘this is my name’;
3. We can not use reserved javascript keywords as a variable name. Var function = ‘john is my name’;
Also like delete, if, else,
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