TAM - JAVASCRIPT CODING EXERCISES: Coding For Beginners

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12

JAVASCRIPT

CODING EXERCISES

CODING FOR BEGINNERS

JJ TAM

Display the current day and time

HTML CODE

JAVASCRIPT CODE

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);

Print the contents

of the current window

HTML CODE

Click the button to print the current page.

Print this page

JAVASCRIPT CODE

function print_current_page()

{

window.print();

}

Display the current date

HTML CODE

JAVASCRIPT CODE

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);

Find the area of a triangle

HTML CODE

JAVASCRIPT CODE

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);

Check whether a given year is a leap year

HTML CODE

JAVASCRIT CODE

function leapyear(year)

{

return (year % 100 === 0) ? (year % 400 === 0) : (year % 4 === 0);

}

console.log(leapyear(2016));

console.log(leapyear(2000));

console.log(leapyear(1700));

console.log(leapyear(1800));

console.log(leapyear(100));

OUTPUT

true

true

false

false

false

Calculate multiplication and division

of two numbers

HTML CODE

body {margin: 30px;}

1st Number :

2nd Number:

The Result is :

JAVASCRIPT CODE

function multiplyBy()

{

num1 = document.getElementById("firstNumber").value;

num2 = document.getElementById("secondNumber").value;

document.getElementById("result").innerHTML = num1 * num2;

}

function divideBy()

{

num1 = document.getElementById("firstNumber").value;

num2 = document.getElementById("secondNumber").value;

document.getElementById("result").innerHTML = num1 / num2;

}

OUTPUT

Convert temperatures

To and from celsius, Fahrenheit in JAVASCRIPT

HTML CODE

JAVASCRIPT CODE

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);

OUTPUT

60C is 140 F.

45F is 7.222222222222222C.

Find the largest

Of three given integers

HTML CODE

JAVASCRIPT CODE

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));

Output:

1000

Reverse a given string

HTML CODE

JAVASCRIPT CODE

function string_reverse(str)

{

return str.split("").reverse().join("");

}

console.log(string_reverse("jsresource"));

console.log(string_reverse("www"));

console.log(string_reverse("JavaScript"));

OUTPUT

ecruosersj

www

tpircSavaJ

Replace every character

with the character following it in the alphabet

HTML CODE

JAVASCRIPT CODE

function string_reverse(str)

function LetterChanges(text) {

//https://goo.gl/R8gn7u

var s = text.split('');

for (var i = 0; i < s.length; i++) {

// Caesar cipher

switch(s[i]) {

case ' ':

break;

case 'z':

s[i] = 'a';

break;

case 'Z':

s[i] = 'A';

break;

default:

s[i] = String.fromCharCode(1 + s[i].charCodeAt(0));

}

// Upper-case vowels

switch(s[i]) {

case 'a': case 'e': case 'i': case 'o': case 'u':

s[i] = s[i].toUpperCase();

}

}

return s.join('');

}

console.log(LetterChanges("PYTHON"));

console.log(LetterChanges("W3R"));

console.log(LetterChanges("php"));

Output:

QZUIPO

X4S

qIq

Capitalize The First Letter

Of Each Word

Of A Given String

HTML CODE

JAVASCRIPT CODE

function capital_letter(str)

{

str = str.split(" ");

for (var i = 0, x = str.length; i < x; i++) {

str[i] = str[i][0].toUpperCase() + str[i].substr(1);

}

return str.join(" ");

}

console.log(capital_letter("Write a JavaScript program to capitalize the first letter of each word of a given string."));

OUTPUT

Output:

Write A JavaScript Program To Capitalize The First Letter Of Each Word Of A Given String.

Convert number to hours and minutes

HTML CODE

JAVASCRIPT CODE

function time_convert(num)

{

var hours = Math.floor(num / 60);

var minutes = num % 60;

return hours + ":" + minutes;

}

console.log(time_convert(71));

console.log(time_convert(450));

console.log(time_convert(1441));

OUTPUT

1:11

7:30

24:1

Count vowels in a given string

HTML CODE

JAVASCRIPT CODE

function vowel_Count(str)

{

return str.replace(/[^aeiou]/g, "").length;

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