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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to get a number of days in a specified month using JavaScript?
To get numbers of days in a month, use the getDate() method and get the days.ExampleYou can try to run the following code to get a number of days in a month −Live Demo var days = function(month,year) { return new Date(year, month, 0).getDate(); }; document.write("Days in July: "+days(7, 2012)); // July month document.write("Days in September: "+days(9, 2012)); // September Month OutputDays in July: 31 Days in September: 30
Read MoreHow to format a rounded number to N decimals using JavaScript?
Use the toFixed() method to format a rounded number to N decimals. The toFixed() method formats a number with a specific number of digits to the right of the decimal.ExampleYou can try to run the following code to form a rounded number to N decimals −Live Demo JavaScript toFixed() Method var num = 15; document.write("num.toFixed() is : " + num.toFixed()); document.write(""); document.write("num.toFixed() is : " + num.toFixed(2)); document.write(""); document.write("num.toFixed() is : " + num.toFixed(1)); document.write(""); Outputnum.toFixed() is : 15 num.toFixed() is : 15.00 num.toFixed() is : 15.0
Read MoreHow to convert a String containing Scientific Notation to correct JavaScript number format?
To convert a string with Scientific Notation, use the Number function. Pass the value to this function.ExampleYou can try to run the following code to convert a string to correct number format −Live Demo document.write("String with Scientific Notation converted below:"); document.write(Number("7.53245683E7")); OutputString with Scientific Notation converted below: 75324568.3
Read MoreHow to test if a JavaScript cookie has expired?
To test if a cookie has expired in JavaScript, add the following condition and check −if( !($.cookie('myCookie') === null) ) { // Do something (cookie exists) } else { // Do something (cookie expired) }You can also check it using a single line code −checkCookie = $.cookie('myCookie') === null ? ( /*Condition TRUE...*/ ) : ( /*Condition FALSE...*/ );
Read MoreHow to count the number of occurrences of a character in a string in JavaScript?
To count the number of occurrences of a character in a string, try to run the following code −ExampleLive Demo function displayCount() { setTimeout(function() { var str = document.getElementById('str1').value; var letter = document.getElementById('letter1').value; letter = letter[letter.length-1]; var lCount; for (var i = lCount = 0; i < str.length; lCount += (str[i++] == letter)); document.querySelector('p').innerText = lCount; return lCount; }, 50); } Enter String: Enter Letter: Click for Result result=
Read MoreWhat is the best way to initialize a JavaScript number?
The best way to initialize a number in JavaScript is to initialize variables while declaring them. Through this, you can easily avoid undefined values.ExampleYou can try to run the following code to initialize a number −Live Demo var deptNum = 20, id = 005; document.write("Department number: "+deptNum);
Read MoreHow to get a decimal portion of a number with JavaScript?
With JavaScript, use the % operator to get the decimal portion of a number.ExampleYou can try to run the following to get decimal portion −Live Demo var num1 = 5.3; var num2 = 4.2; var num3 = 8.6; document.write(num1 % 1); document.write(""+num2 % 1); document.write(""+num3 % 1); Output0.2999999999999998 0.20000000000000018 0.5999999999999996
Read MoreHow to format hexadecimal Number in JavaScript?
Firstly convert your number to hexadecimal with leading zeros and then format it by adding dashes.ExampleYou can try to run the following code to format hexadecimal number −Live Demo var num = 32122; var myHex = ("000000000000000" + num.toString(16)).substr(-16); var resHex = myHex.substr(0, 8)+'-'+myHex.substr(8,4)+'-'+myHex.substr(12,4); document.write(resHex); Output00000000-0000-7d7a
Read MoreHow do you check that a number is NaN in JavaScript?
NaN is a JavaScript property, which is Not-a-Number value. This shows it is not a legal number. Here’s the syntax −SyntaxNumber.NaNTo find out whether a number is NaN, use the Number.isNaN() or isNan() method. Here’s an example to check −ExampleLive Demo Check function display() { var a = ""; a = a + isNaN(434) + ": 434"; a = a + isNaN(-23.1) + ": -23.1"; a = a + isNaN('Hello') + ": 'Hello'"; a = a + isNaN(NaN) + ": NaN"; a = a + isNaN('') + ": ''"; a = a + isNaN(0) + ": 0"; a = a + isNaN(false) + ": false"; document.getElementById("test").innerHTML = a; }
Read MoreHow to calculate the difference between two dates in JavaScript?
To get dates in JavaScript, use the getTime() method. Forgetting the difference between two dates, calculate the difference between date and time.ExampleYou can try to run the following code to learn how to calculate a difference between two dates −Live Demo var dateFirst = new Date("11/25/2017"); var dateSecond = new Date("11/28/2017"); // time difference var timeDiff = Math.abs(dateSecond.getTime() - dateFirst.getTime()); // days difference var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24)); // difference alert(diffDays);
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