JS

Nested - if

let mark=40;
let att=77;
if(mark>=35){
   if(att>75){
      console.log("Eligible for Trip");
   }
}else{
   console.log("Not Eligible");
}

o/p - Eligible for Trip

Ternary Operator

Syntax

condition ? true : false ;

Switch

The switch case statement in JavaScript is used to execute different blocks of code based on the value of an expression. It is often preferred over multiple if / else if statements when checking a single variable against many possible values, as it improves readability and maintainability.

let switchNo = 2;
switch(switchNo)
{
    case 1:
        console.log("fan");
        break;
    case 2:
        console.log("light");
        break;
    case 3:
        console.log("ac");
        break;
    default:
        console.log("enter valid input");
}

o/p - light

Undefined

if the input value is not in the list or case means it will show as undefined.

default

it is used for, if the user or someone gives wrong input value means the default case will be shown.

While loop

It keeps looping until the condition is true or false.