Ninth day for full stack development -->> Java Script: String, Primitive type, variable

JavaScript Begining

 clear{}--> to clear the console

Console Type :- 

REPL --> Read Evaluate Print Loop

Primitive type 

1. Number :- 

math operation

• Format to do math operation. :- PEMDAS -> parenthesis, exponents, multi, division, addition, subtraction.
• use Mod % for Remender if Zero than even and if 1 then odd, divide by2.
• and two use exponent uses two-star(**)
• use( typeof), to get which type o primitive type.

2. variable:-

• .let
• .Const> the values can not change, We store value does not change in your app, this does not work on array and object.
• .var-->

Variable naming.

• can use _
• use lower case
• not use no.

3. String :-

 can define in double quotes("") or single quotes ('')

use index in string :- var_name[0];

get index length :- var_name.length;

can add to string :- "lol"+"lol"; Plus sign(+) is concatination.

using method :- thing.method() ;

using property:- thing.properties;

Diff Strings Methods:-

Strings.trim() --> trim spaces,

strings.toUpperCase()--> capitalize the values

String  Method with Argument:-

strings.indexof('s') --> tells the s index value.

stings.slice(3,5) ->get the string between this index.

strings.replace(st , rp) ---> replace tht st by the rp output will be (rprings).

String.repeat(2) --> repeat the string.

String Template literals:-

`hello ${1+2+3} yes.`  --> start with a backslash (``) and use the dollar sign and curly braces (${variable_name}) to define variables and do the numerical calculation.