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Programming Scripts Articles
Page 18 of 33
How to force a number to display in exponential notation?
Use the toExponential() method to force a number to display in exponential notation, even if the number is in the range in which JavaScript normally uses standard notation.The following is the parameter −fractionDigits - An integer specifying the number of digits after the decimal point. Defaults to as many digits as necessary to specify the number.ExampleYou can try to run the following code to force a number to display in exponential function − Javascript Method toExponential() var num=77.1234; var ...
Read MoreHow to return a string value version of the current number?
The toLocaleString() method returns a string value version of the current number in a format that may vary according to a browser's local settings.ExampleYou can try to run the following code to return a string value version − JavaScript toLocaleString() Method var num = new Number(150.1234); document.write( num.toLocaleString());
Read MoreHow to return a number indicating the Unicode value of the character?
The charCodeAt() method returns a number indicating the Unicode value of the character at the given index. Unicode code points range from 0 to 1, 114, 111. The first 128 Unicode code points are a direct match of the ASCII character encoding.The following parameter is supported by charCodeAt(index) −index − An integer between 0 and 1 less than the length of the string; if unspecified, defaults to 0.ExampleYou can try to run the following code to return a number indicating the Unicode value of the character − JavaScript String charCodeAt() Method ...
Read MoreHow to add properties and methods to an object in JavaScript?
To add properties and methods to an object in JavaScript, use the prototype property.ExampleYou can try to run the following code to learn how to work with prototype − JavaScript prototype property function book(title, author) { this.title = title; this.author = author; } var myBook = new book("Amit", "Java"); book.prototype.price = null; myBook.price = 500; document.write("Book title is : " + myBook.title + ""); document.write("Book author is : " + myBook.author + ""); document.write("Book price is : " + myBook.price + "");
Read MoreHow to apply a function simultaneously against two values of the array from left-to-right?
Use the reduce() method in JavaScript to apply a function simultaneously against two values of the array from left-to-right as to reduce it to a single value.The following are the parameters −callback − Function to execute on each value in the array.initialValue − Object to use as the first argument to the first call of the callback.ExampleYou can try to run the following code to learn how to work with reduce() method in JavaScript − JavaScript Array reduce Method if (!Array.prototype.reduce) { ...
Read MoreHow to return the "time" portion of the Date as a string using the current locale's conventions?
To return the "time" portion of the Date as a string, using the current locale's conventions, use the toLocaleTimeString() method.The toLocaleTimeString method relies on the underlying operating system in formatting dates. It converts the date to a string using the formatting convention of the operating system where the script is running. For example, in the United States, the month appears before the date (04/15/98), whereas in Germany, the date appears before the month (15.04.98).ExampleYou can try to run the following code to return the “time” portion of the Date as a string − JavaScript toLocaleTimeString ...
Read MoreHow to return a string representing the source for an equivalent Date object?
To return a string representing the source for an equivalent Date object, use the JavaScript toSource() method. This method returns a string representing the source code of the object.ExampleYou can try to run the following code to return a string representing the source for an equivalent Date object − JavaScript toSource() Method var dt = new Date(2018, 0, 15, 14, 39, 7); document.write( "Formated Date : " + dt.toSource() );
Read MoreWhat is availHeight property in JavaScript?
Use the screen.availHeight property to return the width of the user's screen. The result will be in pixels and Taskbar feature won't be included. Example You can try to run the following code to learn how to work with the screen.availHeight property in JavaScript – document.write("Height of the screen: "+screen.availHeight);
Read MoreWhat is the role of pageXOffset property in JavaScript?
If you want to get the pixels the document scrolled to from the upper left corner of the window, then use the pageXoffset and pageYoffset property. Use pageXoffset for horizontal pixels. Example You can try to run the following code to learn how to work with pageXOffset property in JavaScript − div { background-color: green; height: 1500px; width: 1500px; } function scrollFunc() { window.scrollBy(200, 200); alert("Horizonal: " + window.pageXOffset); } Scroll
Read MoreWith JavaScript RegExp search a hexadecimal number character.
To find a hexadecimal number character with JavaScript Regular Expression, use the following. Add the hexadecimal number here −\xddExampleYou can try to run the following code to find hexadecimal number character. It searches for hexadecimal number 53 i.e. S − JavaScript Regular Expression var myStr = "Secure and Responsive!"; var reg = /\x53/g; var match = myStr.match(reg); document.write(match);
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