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Javascript Articles
Page 335 of 534
Loop through array and edit string JavaScript
Let's say, we have to write a function, say translate() that accepts a string as the first argument and any number of words after that. The string will actually contain n $ signs like this − This $0 is more $1 just a $2. Then there will be 3 strings which will replace the corresponding places. For example − If the function call is like this: translate('This $0 is more $1 just a $2.', 'game', 'than', 'game'); The output of the function should be: This game is more ...
Read MoreHow to create JavaScript regexes using string variables?
Yes, use new RegExp(pattern, flags) to create JavaScript regular expressions from string variables. This is essential when you need to build patterns dynamically or when the pattern comes from user input or variables. Syntax new RegExp(pattern, flags) Parameters pattern: A string containing the regular expression pattern flags: Optional string specifying flags like 'i' (case-insensitive), 'g' (global), 'm' (multiline) Basic Example var str = 'HelloWorld'.replace(new RegExp('hello', 'i'), ''); document.write(str); ...
Read MoreReduce sum of digits recursively down to a one-digit number JavaScript
We have to write a function that takes in a number and keeps adding its digits until the result is a one-digit number. When we have a one-digit number, we return it. The code uses a recursive function that keeps adding digits until the number is between -9 and 9. We handle the sign separately to avoid duplicating logic. How It Works The algorithm follows these steps: Take the absolute value of the number to handle sign separately If the number is greater than 9, split it into digits and sum them Recursively call the ...
Read MoreWhat is the best JavaScript code to create an img element?
Creating an image element in JavaScript can be done in several ways. The most common approach is using document.createElement() or the Image() constructor. Using document.createElement() The standard DOM method to create an image element: Create Image Element // Create image element var myImg = document.createElement('img'); myImg.src = 'https://via.placeholder.com/150x100'; ...
Read MoreHow to create a new img tag with JQuery, with the src and id from a JavaScript object?
To create a new img tag with jQuery using data from a JavaScript object, you can pass an HTML string to the jQuery constructor or use the attribute object syntax. Method 1: Using HTML String and attr() Create an img element and set attributes using the attr() method: // JavaScript object with image data var imageData = { id: 'dynamic-image', src: 'https://via.placeholder.com/150', alt: 'Dynamic Image' }; // Create img element and set attributes var myImg = $(''); myImg.attr('id', imageData.id); myImg.attr('src', imageData.src); myImg.attr('alt', ...
Read MoreHow to compare two arrays in JavaScript and make a new one of true and false? JavaScript
We have 2 arrays in JavaScript and we want to compare one with the other to see if the elements of master array exists in keys array, and then make one new array of the same length that of the master array but containing only true and false (being true for the values that exists in keys array and false the ones that don't). Let's say, if the two arrays are − const master = [3, 9, 11, 2, 20]; const keys = [1, 2, 3]; Then the final array should be − ...
Read MoreHow to work with Structs in JavaScript?
In this tutorial, let us discuss how to work with structs in JavaScript. What is a struct? A struct is the short name of the data structure. The structure creates multiple values of different types in a single variable. We can use a struct to generate records. JavaScript doesn't have built-in struct support like C or C++. However, we can simulate struct-like behavior using JavaScript objects and constructor functions. Let us see the methods to create a structure. Using the String split() Method We can create a struct constructor dynamically by parsing a comma-separated string of ...
Read MoreHow to set the color of the rule between columns with JavaScript?
In this tutorial, we will learn how to set the color of the rule between columns with JavaScript. Multiple columns are used to increase the readability of long paragraphs or articles. The column-count CSS property is used to divide the text into columns. To set the color of the rule between columns with JavaScript, we use the columnRuleColor property of the style object. Using the style.columnRuleColor Property In JavaScript, the style.columnRuleColor property of an element is used to set the color of the rule between columns. We can set colors using color names, hex codes, or RGB ...
Read MoreHow to set the font family for text with JavaScript?
In this tutorial, we will learn how to set the font family for text with JavaScript. The font-family is a CSS property that specifies a prioritized list containing one or more font family names and generic family names for the text of an HTML element. To set the font-family for text with JavaScript, we have multiple ways, and in this tutorial, we will discuss two of them − Using the style.fontFamily Property Using the style.setProperty Method Using the style.fontFamily Property The style.fontFamily property sets a list of font ...
Read MoreDoes it make sense to use HTML comments on blocks of JavaScript?
No, it does not make sense to use HTML comments on blocks of JavaScript in modern web development. HTML comments within JavaScript were a workaround used in the 1990s to hide JavaScript code from very old browsers that didn't understand the tag. Since all modern browsers support JavaScript, this practice is obsolete and not recommended. Historical Context: Why HTML Comments Were Used In the early days of JavaScript (1995), browsers like Netscape 1 didn't support the tag. Without HTML comments, these browsers would display JavaScript code as plain text on the webpage. The HTML comment syntax ...
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