Most Important JavaScript programms || JS Programms

 Most Important JavaScript programms

 

          Get the length of an array:

        var length = array.length;

       

        Convert an array to a string:

        var string = array.join(',');

       

        Check if a variable is null or undefined:

        if (variable == null) {

          // variable is null or undefined

        }

       

        Remove an element from an array by its index:

        array.splice(index, 1);

       

        Convert a number to a string:

        var string = number.toString();

       

        Get the current URL of the page:

        var currentURL = window.location.href;

       

        Round a number to a specified decimal place:

        var roundedNumber = number.toFixed(decimalPlaces);

       

        Get the index of the first occurrence of an element in an array:

        var index = array.indexOf(element);

       

        Create a new object with specific properties from an existing object:

        var newObject = {

          property1: existingObject.property1,

          property2: existingObject.property2

        };

       

       

Most Important JavaScript Methods || JavaScript Practice

 JavaScript Methods 

 

             1. Remove all whitespace from a string:

             Ans:-

            var stringWithoutWhitespace = string.replace(/\s/g, '');

           2. Convert a string to an integer:

           Ans:-

            var integer = parseInt(string);

            3. Sort an array in ascending order:

             Ans:-

            array.sort(function(a, b) {

              return a - b;

            });

            4. Find the maximum value in an array:

            Ans:-

            var max = Math.max(...array);

            5. Find the minimum value in an array:

            Ans:-

            var min = Math.min(...array);

                                  Thanks for visiting

JavaScript Question Practice For Logic Building || JS QNA

 JavaScript Question Practice For Logic Building 

 Q .  Write a JavaScript program to check whether

         a given integer is within 20 of 100 or 400.

     solution

    function testhundred(x) {

      return ((Math.abs(100 - x) <= 20) ||

       (Math.abs(400 - x) <= 20));

    }

    console.log(testhundred(10));

    console.log(testhundred(90));

     

     Q .  Write a JavaScript program to check two given

     integers whether one is positive and another one is negative.  

    solution

    function check(a,b){

      if((a < 0 && b > 0) || a > 0 && b < 0) {

        return true ;

      }

      else{

        return false;

      }

    }

    console.log(check(2,2))

    console.log(check(2,-2))

    console.log(check(-2,2))

    console.log(check(-2,-2))

     

     Q. Write a JavaScript program to create another string

    by adding "Py" in front of a given string. If the given

    string begins with "Py" return the original string.

     Solution

    function string_check(str1) {

    if (str1 === null || str1 === undefined || str1.substring(0, 2) === 'Py')

      {

        return str1;

      }

      return "Py"+str1;

    }

   

    console.log(string_check("Python"));

    console.log(string_check("thon"));

   

    Q . Write a JavaScript program to remove a character at the

   specified position in a given string and return the modified string

    Solution

    function removestr(){

      let str1 = "Hi getcodr" ;

      let str2 = str1.replace('Hi ','') ;

      return str2 ;

    }

    console.log(removestr()) ;

   

    Q. Write a JavaScript program to create a new string from a

       given string by changing the position of the first and last

     characters. The string length must be broader than or equal to 1.

    Solution

      function first_last(str1){

      if(str1.length <= 1){

        return str1 ;

      }

      newstr = str1.substring(1, str1.length - 1) ;

      return (str1.charAt(str1.length - 1)) + newstr + str1.charAt(0) ;

    }

    console.log(first_last('ram'));

JavaScript Questions For Practice || JavaScript Practice || Important Question

 

JavaScript Questions For Practice || JavaScript Practice || Important Question || Practice Set

 

Q. 1  Write a JavaScript program to display the current day and time in the following

         format?        

        Sample Output : Today is : Tuesday.

        Current time is : 10 PM : 30 : 38  

// Solutions

// Make a Weeks Array

let weeks=["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"] ;

// For Get Current Date

let curdate = new Date() ;

// For Get Current Day

let days = weeks[curdate.getDay()] ;

// For Get Hour

let h = curdate.getHours();

// For Get  Minutes

let m = curdate.getMinutes();

// For Get Seconds  

let s = curdate.getSeconds();

// First Output

console.log("Today is : " + days) ;

// we use template literls also

console.log(`Today is : ${days}`) ;

// Second Output

console.log("Current time is " + h + " PM "+" : " + m +" : " + s );

// we use template literls also

console.log(`Current time is   ${h} PM  :  ${m}  : ${s}`);

   Q.2 Write a JavaScript program to print the current window contents ?

    

    solution :-

    <body>

    <p>Click the button to print the current page.</p>

    <button onclick="print_page()">Click For Print</button>

    </body>

    
     <script>

          function print_page()

        {

            window.print();

        }

     </script>

       

         Q.3 Write a JavaScript program to get the current date.  

         Expected Output :

         mm-dd-yyyy, mm/dd/yyyy or dd-mm-yyyy, dd/mm/yyyy

   Solution :-

         <script>

        let d = new Date();

        let mm = d.getMonth();

        let dd = d.getDay();

        let yy = d.getFullYear();

        if (mm < 10) {

            mm = '0' + mm;

        }

        if (dd < 10) {

            dd = '0' + dd;

        }

        d = mm + '-' + dd + '-' + yy;

        console.log(d);

        d = mm + '/' + dd + '/' + yy;

        console.log(d);

        d = dd + '-' + mm + '-' + yy;

        console.log(d);

        d = dd + '/' + mm + '/' + yy;

        console.log(d);

        document.write(date)

    </script>

                                getcodr