java script some basic start

comment  - //

multiline comment   -    /* kd  write any number of line */

variables

var number1 = 12;

var number2 = 34;

console.log(number1+number2);

objects//

var marks = {

      ravi = 26,

      raju = 34,

      vijay = 65

}

Booleans 

var a = true;

var b = false;

.

Two types of data type in javascript 

1- primitive data type: undefined, null, number,string,boolean,symbol

2- reference data type: Arrays and Object 

write array :

var arr = [1,2,3,4,5]

/// check on console - console.log(arr[2]);  or console.log(arr);

// operator in javascript 

Athematic operator 

var a = 100

var b = 10

console.log("The value of a+b is  ", a+b);

// Assigment Operators 

  var c = b;

  c += 2;

  console.log(c)

 //comparision operatos

  var x = 10

  var y = 20

  console.log(x==y)

  console.log(x>=y)

  console.log(x<=y)

// logical operator 

  console.log(true && true); 

  console.log(false && false);

 // logical or operator 

  console.log(true || false); 

  console.log(false || false);

 // logical not operator 

  console.log(!false); 

  console.log(!true);

  

 // function 

  function avg(a, b){

  return (a + b)/2;

  }

  

  c = avg(4, 6)

  c2 = avg(25, 98)

  console.log(c);

  console.log(c2);

  

  // conditional 

  var age = 23;

  if(age > 20){

  console.log("your age is more than 20")

  }

  else{

  console.log("your age is less than 20")

  }

  

  // else-if ladder 

  if(age < 32){

  console.log("you are a kid")

  }

  else if(age < 32){

  console.log("you are actually a  kid")

  }

  else {

  console.log("I am a kid")

  }