Scope, If-else Conditionals & Switch Case in JavaScript

we will use let instead of  var

 // let a = "u";
    // {
    // let a = "u6";
    // console.log(a)
    // }

 value given in a container or condition are local to that container

thus the above example is valid

const a = "This cannot be changed";

the value of a constant variable can not changed

if-else statement

  // if(age>18){
    //     console.log("You can drink water");
    // }
    // else if(age==2){
    //     console.log("Age is 2")
    // }
    // else if(age==5){
    //     console.log("Age is 5")
    // }
    // else{
    //     console.log("You can drink Cold Drink");
    // }

this is the example of if else condition

switch

 const cups = 47; 
    switch (cups) {
        case 4:
            console.log("The value of cups is 4")
            break;

        case 41:
            console.log("The value of cups is 41")
            break;

        case 42:
            console.log("The value of cups is 42")
            break;

        case 43:
            console.log("The value of cups is 43")
            break;
    
        default:
            console.log("The value of cups is none of 4, 41, 42, 43")
            break;
    }

this is how we use switch statement