tenth day for full stack development -->> Javascript: variable type, Comparision operator, Take input by alert, Logical operator, switch statement, convert string to int, array and it's method.

// tell the variable type.

type of ("var"); 

==(double equal)

1. check for equality of value, but not equality of type.
2. It coerces both values to the same type and then compares them.
3. this can lead to some unexpected results!

===(triple equal) 

• strictly equal,
• check for equality of value, and also equality of type.

prompt to take the input from the user by the alert tab.\

prompt("enter the input") //return the string.

Logical operator.

&& (and operator)-->

truth && truth --->> output true 

else it will be false

|| (or operator)

false|| truth---> Output true (any of condition is true then true)

false||false --> output false (both condition should be false )

Switch Condition

//define the function.

function week(day) {

//use of and operator

    if (0 < day && day <= 7) {

        switch (day) {

            case 1:

                console.log("monday");

                break;

            case 2:

                console.log("tuesday");

                break;

            case 3:

                console.log("wednesday");

                break;

            case 4:

                console.log("thrusday");

                break;

            case 5:

                console.log("friday");

                break;

            case 6:

                console.log("saturday");

                break;

            default:

                console.log("weekday");

                break;

        }

    }

    else {

        day = parseInt(prompt("enter b/w 1 to 7"));

//recursive function

        week(day);

    }

}

//convert string to int

const day = parseInt(prompt("enter the week day no."));

//call the function

week(day);

//working with an array

//define the array

let colors=['red','orange','green','Yellow'];

//multidimensional array

let colorthings=[[black, hair],[white, teeth],[blue, eyes],[skin,brown]];

//change the value of array

colors[0]="red";

//array methods

let movieline=['tom', 'nancy'] //array

//1. Add the element in an array at the last of the array, if you don't know the index length of the array.

movieline.push('oliver')

//2. Remove the last element of the array, if you don't know the index length of the array.

movieline.pop()

//3. Add the element in an array at the first index.

movieline.unshift('olive')

//4. Remove the first element of the array.

movieline.shift()

//5. merge the two array

let colors=['red','orange','green','Yellow'];

let movieline=['tom', 'nancy']

let newarray= colors.concat(movieline); //the array name which is first use, will show first in new array

//6. tell whether the element is in the array or not

colors.include('green')//output:true, it always tell you the boolean value.

//7. tell the index of the value

colors.indexOf('green')//output :2 , tells the index of value from array.

//8. reverse the array

colors.reverse();

//9. break array in 2 parts

colors.slice(2,4)//break array in two-part and one 0 to 1 and other one is 2 to 4.

//10. delete, replace the element from the array from where you want.

colors.splice(1,2)//delete the 2 element from array after the index one.

color.splice(1,0,'red-orange')//add the value red-orange in the array.