1.What is java script ?
- It is high level programming language
- It is also a scripting language
- Used to make webpages dynamic
- Used to built websites and web applications
2. Datatypes in JS?
- Datatypes in javascript can be classified into 2 types
Primitive datatype
Non-Primitive datatype
Primitive datatype
*string
Denotes wordings
(E.g)"Akash","mohandass"
*number
Denotes number
(E.g) 1,2,3,4,5
*big int
Denotes large value
(E.g) 600654789
*boolean
Denotes True or False
(E.g) 10=10 Result:True
symbol
Denotes Symbols
(E.g) %,<,>,,/
*Null
Denotes No value
*undefined
Denotes variable is there but no value is assigned
*NAN
Denotes value representing Not A Number
Non-primitive datatype
1.Function
- Function is a reusable code of block
- It includes set of informations
- Function means Activity
OUTPUT:BEST OF LUCK AKASH
2.Array
- Array is used to store a multiple values in single container
- Array stores value using[]
OUTPUT:60
3.Object
- Object is a collection of key values
- Object declare values by {}
- It includes state and behaviour
- Object contains another object
OUTPUT: RX100
DIFFERENCE BETWEEN PRIMITIVE AND NON-PRIMITIVE DATATYPE
=>Variables in JS
- Older Javascript To Declare variable use var(not recommended )
- Modern Javascript To Declare variable use 1.let 2.const (Mostly Recommended) *If you don't need to change the value of variable use const
OUTPUT=13
- Var is used before 2015
- Let and const used later 2015
- Variables are label for data values
BLOCK SCOPE:Can change fir functional scope
FUNCTION SCOPE: Not change for Block scope
- Also maintain scope inside function
Above contents referred in MDN and W3 School.
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