Java Script Programs
Program to print hello world
<html>
<body>
<script type="text/javascript">
document.write("hello World");
</script>
</body>
</html>Program to swap two strings.
<html>
<head>
<script> function swap()
{
var txt = document.getElementById('t1').value;
document.getElementById('t1').value = document.getElementById('t2').value; document.getElementById('t2').value = txt;
}
</script>
</head>
<body>
<input type="text" id="t1"> <input type="text" id="t2">
<br>
<input type="button" value="Swap" onclick="swap()">
</body>
</html>Program to add text to a particular division in the page.
<script>
function add1()
{
document.getElementById('div1').innerHTML = document.getElementById('t1').value
}
</script>
<input type="text" id="t1"> <br> <input type="button" value="Click" onclick="add1()"> <div id="div1">
</div>
Program to change style of a text at runtime.
<script>
function chngstyle()
{
document.getElementById('div1').style.color = "Red"
document.getElementById('div1').style.backgroundColor = "yellow"
document.getElementById('div1').style.width = "100"
document.getElementById('div1').style.height = "100"
}
</script>
<div id="div1"> Welcome to all </div>
<input type="button" value="Click" onclick="chngstyle()">Program to change color of the text box if empty string submitted.
<script>
function funup(val)
{
if(val.length>0) document.getElementById('t1').style.borderColor="silver";
}
function fun1()
{
txt=document.getElementById('t1').value if(txt.length == 0) document.getElementById('t1').style.borderColor = "red"
}
</script>
<input type="text" id="t1" onkeyup="funup(this.value)">
<input type="button" value="Submit" onclick="fun1()">Write a JavaScript program to display the current day and time in the following format.
<script>
var today = new Date();
var day = today.getDay();
var daylist=["Sunday"
,"Monday","Tuesday"
,"Wednesday","Thursday","Friday",
"Saturday"];
console.log("Today is : " + daylist[day] + ".");
var hour = today.getHours();
var minute = today.getMinutes();
var second = today.getSeconds();
var prepand = (hour >= 12)? " PM ":" AM ";
hour = (hour >= 12)? hour - 12: hour;
if (hour===0 && prepand===' PM ')
{
if (minute===0 && second===0)
{
hour=12;
prepand=' Noon';
}
else
{
hour=12;
prepand=' PM';
}
}
if (hour===0 && prepand===' AM ')
{
if (minute===0 && second===0)
{
hour=12;
prepand=' Midnight';
}
else
{
hour=12;
prepand=' AM';
}
}
console.log("Current Time : "+hour + prepand + " : " + minute + " : " + second);
</script>Write a JavaScript program to get the current date.
<script>
var today = new Date();
var dd = today.getDate();
var mm = today.getMonth()+1;
var yyyy = today.getFullYear();
if(dd<10)
{
dd='0'+dd;
}
if(mm<10)
{
mm='0'+mm;
}
today = mm+'-'+dd+'-'+yyyy;
console.log(today);
today = mm+'/'+dd+'/'+yyyy;
console.log(today);
today = dd+'-'+mm+'-'+yyyy;
console.log(today);
today = dd+'/'+mm+'/'+yyyy;
console.log(today);
</script>Write a JavaScript function to find the area of a triangle where lengths of the three of its sides are 5, 6, 7.
<script>
var side1 = 5;
var side2 = 6;
var side3 = 7;
var s = (side1 + side2 + side3)/2;
var area = Math.sqrt(s*((s-side1)*(s-side2)*(s-side3)));
console.log(area);
</script>Write a JavaScript program to determine whether a given year is a leap year in the Gregorian calendar.
<script>
year = window.prompt("Input a Year : ");
x = (year % 100 === 0) ? (year % 400 === 0) : (year % 4 === 0);
console.log(x);
</script>Write a JavaScript program to find which 1st January is being a Sunday between 2014 and 2050.
<script>
console.log('--------------------');
for (var year = 2014; year <= 2050; year++)
{
var d = new Date(year, 0, 1);
if ( d.getDay() === 0 )
console.log("1st January is being a Sunday "+year);
}
console.log('--------------------');
</script>Write a JavaScript program to calculate number of days left until next Christmas.
<script>
today=new Date();
var cmas=new Date(today.getFullYear(), 11, 25);
if (today.getMonth()==11 && today.getDate()>25)
{
cmas.setFullYear(cmas.getFullYear()+1);
}
var one_day=1000*60*60*24;
console.log(Math.ceil((cmas.getTime()-today.getTime())/(one_day))+
" days left until Christmas!");
</script>Write a JavaScript program to convert temperatures to and from celsius, fahrenheit.
function cToF(celsius)
{
var cTemp = celsius;
var cToFahr = cTemp * 9 / 5 + 32;
var message = cTemp+'\xB0C is ' + cToFahr + ' \xB0F.';
console.log(message);
}
function fToC(fahrenheit)
{
var fTemp = fahrenheit;
var fToCel = (fTemp - 32) * 5 / 9;
var message = fTemp+'\xB0F is ' + fToCel + '\xB0C.';
console.log(message);
}
cToF(60);
fToC(45);Write a JavaScript program to check if two numbers are in range 40..60 or in the range 70..100 inclusive.
function numbers_ranges(x, y) {
if ((x >= 40 && x <= 60 && y >= 40 && y <= 60)
||
(x >= 70 && x <= 100 && y >= 70 && y <= 100))
{
return true;
}
else
{
return false;
}
}
console.log(numbers_ranges(44, 56));
console.log(numbers_ranges(70, 95));
console.log(numbers_ranges(50, 89));Write a JavaScript program to check if the last digit of the three given positive integers is same.
function last_digit(x, y, z)
{
if ((x > 0) && y > 0 && z > 0)
{
return (x % 10 == y % 10 && y % 10 == z % 10 && x % 10 == z % 10);
}
else
return false;
}
console.log(last_digit(20, 30, 400));
console.log(last_digit(-20, 30, 400));
console.log(last_digit(20, -30, 400));
console.log(last_digit(20, 30, -400));Write a JavaScript program to create a new string with first 3 characters are in lower case from a given string. If the string length is less than 3 convert all the characters in upper case.
function upper_lower(str) {
if (str.length < 3) {
return str.toUpperCase();
}
front_part = (str.substring(0, 3)).toLowerCase();
back_part = str.substring(3, str.length);
return front_part + back_part;
}
console.log(upper_lower("Python"));
console.log(upper_lower("Py"));
console.log(upper_lower("JAVAScript"));Write a JavaScript program to compute the absolute difference between a specified number and 19. Returns triple their absolute difference if the specified number is greater than 19.
function diff_num(n) {
if (n <= 19) {
return (19 - n);
}
else
{
return (n - 19) * 3;
}
}
console.log(diff_num(12));
console.log(diff_num(19));
console.log(diff_num(22));Write a JavaScript program to check two given numbers and return true if one of the number is 50 or if their sum is 50.
function test50(x, y)
{
return ((x == 50 || y == 50) || (x + y == 50));
}
console.log(test50(50, 50))
console.log(test50(20, 50))
console.log(test50(20, 20))
console.log(test50(20, 30))Write a JavaScript program to check a given integer is within 20 of 100 or 400
function testhundred(x) {
return ((Math.abs(100 - x) <= 20) ||
(Math.abs(400 - x) <= 20));
}
console.log(testhundred(10));
console.log(testhundred(90));
console.log(testhundred(99));
console.log(testhundred(199));
console.log(testhundred(200));Write a JavaScript program to check from two given integers, if one is positive and one is negative.
function positive_negative(x, y)
{
if ((x < 0 && y > 0) || x > 0 && y < 0)
{
return true;
}
else
{
return false;
}
}
console.log(positive_negative(2, 2));
console.log(positive_negative(-2, 2));
console.log(positive_negative(2, -2));
console.log(positive_negative(-2, -2));Write a JavaScript program to create a new string adding “Py” in front of a given string. If the given string begins with “Py” then return the original string.
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"));Write a JavaScript program to remove a character at the specified position of a given string and return the new string.
function remove_character(str, char_pos)
{
part1 = str.substring(0, char_pos);
part2 = str.substring(char_pos + 1, str.length);
return (part1 + part2);
}
console.log(remove_character("Python",0));
console.log(remove_character("Python",3));
console.log(remove_character("Python",5));Write a JavaScript program to create a new string from a given string changing the position of first and last characters. The string length must be greater than or equal to 1.
function first_last(str1)
{
if (str1.length <= 1)
{
return str1;
}
mid_char = str1.substring(1, str1.length - 1);
return (str1.charAt(str1.length - 1)) + mid_char + str1.charAt(0);
}
console.log(first_last('a'));
console.log(first_last('ab'));
console.log(first_last('abc'));Write a JavaScript program to create a new string from a given string with the first character of the given string added at the front and back.
function front_back(str)
{
first = str.substring(0,1);
return first + str + first;
}
console.log(front_back('a'));
console.log(front_back('ab'));
console.log(front_back('abc'));Write a JavaScript program check if a given positive number is a multiple of 3 or a multiple of 7.
function test37(x)
{
if (x % 3 == 0 || x % 7 == 0)
{
return true;
}
else {
return false;
}
}
console.log(test37(12));
console.log(test37(14));
console.log(test37(10));
console.log(test37(11));Write a JavaScript program to create a new string from a given string taking the last 3 characters and added at both the front and back. The string length must be 3 or more.
function front_back3(str)
{
if (str.length>=3)
{
str_len = 3;
back = str.substring(str.length-3);
return back + str + back;
}
else
return false;
}
console.log(front_back3("abc"));
console.log(front_back3("ab"));
console.log(front_back3("abcd"));Write a JavaScript program to check if a string starts with ‘Java’ and false otherwise.
function start_spec_str(str)
{
if (str.length < 4)
{
return false;
}
front = str.substring(0, 4);
if (front == 'Java')
{
return true;
}
else
{
return false;
}
}
console.log(start_spec_str("JavaScript"));
console.log(start_spec_str("Java"));
console.log(start_spec_str("Python"));Write a JavaScript program to check if two given integer values are in the range 50..99 (inclusive). Return true if either of them are in the said range.
function check_numbers(x, y)
{
if ((x >= 50 && x <= 99) || (y >= 50 && y <= 99))
{
return true;
}
else
{
return false;
}
}
console.log(check_numbers(12, 101));
console.log(check_numbers(52, 80));
console.log(check_numbers(15, 99));Write a JavaScript program to check if three given integer values are in the range 50..99 (inclusive). Return true if one or more of them are in the said range.
function check_three_nums(x, y, z)
{
return (x >= 50 && x <= 99) || (y >= 50 && y <= 99) || (z >= 50 && z <= 99);
}
console.log(check_three_nums(50, 90, 99));
console.log(check_three_nums(5, 9, 199));
console.log(check_three_nums(65, 89, 199));
console.log(check_three_nums(65, 9, 199));Write a JavaScript program to check if a string “Script” presents at 5th (index 4) position in a given string, if “Script” presents in the string return the string without “Script” otherwise return the original one.
function check_script(str)
{
if (str.length < 6) {
return str;
}
let result_str = str;
if (str.substring(10, 4) == 'Script')
{
result_str = str.substring(0, 4) + str.substring(10,str.length);
}
return result_str;
}
console.log(check_script("JavaScript"));
console.log(check_script("CoffeeScript"));Write a JavaScript program to find the largest of three given integers.
function max_of_three(x, y, z)
{
max_val = 0;
if (x > y)
{
max_val = x;
} else
{
max_val = y;
}
if (z > max_val)
{
max_val = z;
}
return max_val;
}
console.log(max_of_three(1,0,1));
console.log(max_of_three(0,-10,-20));
console.log(max_of_three(1000,510,440));Write a JavaScript program to find a value which is nearest to 100 from two different given integer values.
function near_100(x, y) {
if (x != y)
{
x1 = Math.abs(x - 100);
y1 = Math.abs(y - 100);
if (x1 < y1)
{
return x;
}
if (y1 < x1)
{
return y;
}
return 0;
}
else
return false;
}
console.log(near_100(90, 89));
console.log(near_100(-90, -89));
console.log(near_100(90, 90));Write a JavaScript program to check if two numbers are in range 40..60 or in the range 70..100 inclusive.
function numbers_ranges(x, y) {
if ((x >= 40 && x <= 60 && y >= 40 && y <= 60)
||
(x >= 70 && x <= 100 && y >= 70 && y <= 100))
{
return true;
}
else
{
return false;
}
}
console.log(numbers_ranges(44, 56));
console.log(numbers_ranges(70, 95));
console.log(numbers_ranges(50, 89));Write a JavaScript program to find the larger number from the two given positive integers, the two numbers are in the range 40..60 inclusive.
function max_townums_range(x, y){
if( (x >= 40) && (x <= 60) && (y >= 40 && y <= 60) ){
if(x === y){
return "Numbers are the same";
}else if (x > y){
return x;
}else{
return y;
}
}else{
return "Numbers don't fit in range";
}
}
console.log(max_townums_range(45, 60));
console.log(max_townums_range(25, 60));
console.log(max_townums_range(45, 80));
Write a JavaScript program to check a given string contains 2 to 4 numbers of a specified character.
function check_char(str, char)
{
ctr = 0;
for (let i = 0; i < str.length; i++)
{
if (str.charAt(i) == char) {
ctr++;
}
}
return (ctr >= 2 && ctr <= 4);
}
console.log(check_char("Python", "y"));
console.log(check_char("JavaScript", "a"));
console.log(check_char("Console", "o"));Write a JavaScript program to check if the last digit of the three given positive integers is same
function last_digit(x, y, z)
{
if ((x > 0) && y > 0 && z > 0)
{
return (x % 10 == y % 10 && y % 10 == z % 10 && x % 10 == z % 10);
}
else
return false;
}
console.log(last_digit(20, 30, 400));
console.log(last_digit(-20, 30, 400));
console.log(last_digit(20, -30, 400));
console.log(last_digit(20, 30, -400));Write a JavaScript program to create a new string with first 3 characters are in lower case from a given string. If the string length is less than 3 convert all the characters in upper case.
function upper_lower(str) {
if (str.length < 3) {
return str.toUpperCase();
}
front_part = (str.substring(0, 3)).toLowerCase();
back_part = str.substring(3, str.length);
return front_part + back_part;
}
console.log(upper_lower("Python"));
console.log(upper_lower("Py"));
console.log(upper_lower("JAVAScript"));Write a JavaScript program to check the total marks of a student in various examinations. The student will get A+ grade if the total marks are in the range 89..100 inclusive, if the examination is “Final-exam.” the student will get A+ grade where total marks must be greater than or equal to 90. Return true if the student get A+ grade or false otherwise.
function exam_status(totmarks,is_exam)
{
if (is_exam) {
return totmarks >= 90;
}
return (totmarks >= 89 && totmarks <= 100);
}
console.log(exam_status("78", " "));
console.log(exam_status("89", "true "));
console.log(exam_status("99", "true "));Write a JavaScript program to compute the sum of the two given integers, If the sum is in the range 50..80 return 65 other wise return 80
function sortaSum(x, y)
{
const sum_nums = x + y;
if (sum_nums >= 50 && sum_nums <= 80) {
return 65;
}
return 80;
}
console.log(sortaSum(30,20));
console.log(sortaSum(90,80));Write a JavaScript program to check from two given integers whether one of them is 8 or their sum or difference is 8.
function check8(x, y) {
if (x == 8 || y == 8) {
return true;
}
if (x + y == 8 || Math.abs(x - y) == 8)
{
return true;
}
return false;
}
console.log(check8(7, 8));
console.log(check8(16, 8));
console.log(check8(24, 32));
console.log(check8(17, 18));Write a JavaScript program to check whether three given numbers are increasing in strict mode or in soft mode.
function number_order(x, y, z ) {
if ( y > x && z > y)
{
return "strict mode";
}
else if(z > y)
return "Soft mode";
else
return "Undefinded";
}
console.log(number_order(10,15,31));
console.log(number_order(24,22,31));
console.log(number_order(50,21,15));Write a JavaScript program to check from three given numbers (non negative integers) that two or all of them have the same rightmost digit.
function same_last_digit(p, q, r) {
return (p % 10 === q % 10) ||
(p % 10 === r % 10) ||
(q % 10 === r % 10);
}
console.log(same_last_digit(22,32,42));
console.log(same_last_digit(102,302,2));
console.log(same_last_digit(20,22,45));Write a JavaScript program to check from three given integers that whether a number is greater than or equal to 20 and less than one of the others.
function lessby20_others(x, y, z)
{
return (x >= 20 && (x < y || x < z)) ||
(y >= 20 && (y < x || y < z)) ||
(z >= 20 && (z < y || z < x));
}
console.log(lessby20_others(23, 45, 10));
console.log(lessby20_others(23, 23, 10));
console.log(lessby20_others(21, 66, 75));Write a JavaScript program to check two given integer values and return true if one of the number is 15 or if their sum or difference is 15.
function test_number(x, y) {
return (x === 15 || y === 15 || x + y === 15 || Math.abs(x - y) === 15);
}
console.log(test_number(15, 9));
console.log(test_number(25, 15));
console.log(test_number(7, 8));
console.log(test_number(25, 10));
console.log(test_number(5, 9));
console.log(test_number(7, 9));
console.log(test_number(9, 25));Write a JavaScript program to check two given non-negative integers that whether one of the number (not both) is multiple of 7 or 11.
function valCheck (a, b) {
if (!((a % 7 == 0 || a % 11 == 0) && (b % 7 == 0 || b % 11 == 0))) {
return ((a % 7 == 0 || a % 11 == 0) || (b % 7 == 0 || b % 11 == 0));
}
else
return false;
}
console.log(valCheck(14, 21));
console.log(valCheck(14, 20));
console.log(valCheck(16, 20));