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Web Development Articles
Page 322 of 801
JavaScript - Check if value is a percentage?
To check the value for percentage, use a regular expression. When dealing with user input or processing data in JavaScript, it's important to make sure a value is a valid percentage. This article shows you how to check if a value is a percentage using JavaScript, highlighting a useful method that involves regular expressions. Let's say the following is our value: var value = "97%"; To check the value for percentage, we are using a regular expression that matches numbers followed by the % symbol. Using Regular Expression The best way to check ...
Read MoreJavaScript: How to filter out Non-Unique Values from an Array?
To filter out non-unique values from an array in JavaScript, you can use the filter() method, a for loop, the Set and filter() method, and the reduce() method. In this article, we will filter out non-unique values and return an array that only contains unique non-repeating elements. Arrays are data structures used to store data in a structured format. We can store the data in an array and retrieve them using their indexes. These indexes serve as a key for these values. Table of Content Filtering non-unique values from an array can be done in the following ways: ...
Read MoreJavaScript: How to map array values without using \"map\" method?
When you need to transform array elements without using the built-in map() method, JavaScript provides several alternatives. These approaches manually iterate through arrays and apply transformations to create new arrays with modified values. Table of Contents You can map array values without using the map method in the following ways: Using forEach() Using reduce() Using a for Loop Using while Loop Using forEach() The forEach() method iterates through each array element, allowing you to apply transformations while manually building a ...
Read MoreJavaScript input type=submit is not working?
The input type submit is not working is one of the common issues that developers face while working with JavaScript forms. To make it work properly, you need to handle form events correctly or prevent the default browser behavior when necessary. This article examines common reasons why a submit button might not work in JavaScript and provides practical solutions to resolve these issues. Common Reasons for Submit Button Issues The following are some common reasons that may lead to this issue: Missing Event Listener − If you haven't added an event ...
Read MoreJavaScript Sum of two objects with same properties
In JavaScript, summing two objects with identical properties is a common task when working with data aggregation. This involves creating a new object where each property's value is the sum of corresponding values from the input objects. In JavaScript, objects are data structures that store key-value pairs. When you have multiple objects with the same property names, you often need to combine their values mathematically. Understanding the Problem When you have two objects with the same property names, the goal is to create a new object where each property's value is the sum of the matching values ...
Read MoreJavaScript: Computing the average of an array after mapping each element to a value
Computing the average of an array after mapping each element to a value in JavaScript can be done using several approaches including the forEach() loop, parseInt() method, reduce() method, and for...of loop. This article demonstrates how to calculate the average by summing all array elements and dividing by the array length. Given below are examples of arrays where we compute the average by summing values and dividing by the number of elements: Input: [1, 2, 3, 4, 5] Result: 3 Explanation: (1+2+3+4+5)/5 = 3 Input: [2, 4, 7, 9, 1, 3, 8] Result: 4.857142857142857 Explanation: (2+4+7+9+1+3+8)/7 ...
Read MoreJavaScript union of two objects
In this article, we will learn to calculate the union of two objects in JavaScript. The union of two objects results in a new object that contains all the properties of both objects. What is the Union of Two Objects? The union of two objects is the process of combining the properties of both objects into a single object. When properties have the same key, their values are merged together. For example Input − const obj1 = { name: "John", email: "john@email.com" }; const obj2 = { name: "Jane", email: "jane@email.com" }; ...
Read MoreJavaScript checking if all the elements are same in an array
In this article, we will learn to check if all the elements are the same in an array in JavaScript. Finding all elements of an array to be the same is a frequent problem in JavaScript, usually needed for data validation, game logic, and algorithm building. Problem Statement We are required to write a JavaScript function that takes in an array of literals. The function should find whether or not all the values in the array are the same. If they are the same, the function should return true, or false otherwise. For Example Input ...
Read MoreHow to search a string for a pattern in JavaScript?
Searching strings for specific patterns is a common task in JavaScript. Strings are data types and are represented as a sequence of characters. Searching patterns means verifying the presence of a specific pattern in a given string. A pattern would be a specific word, specific characters, and so on. JavaScript offers several powerful methods for pattern matching, such as inbuilt string methods and regular expressions. This article will guide you on how to search strings for specific patterns in JavaScript. Table of contents Searching strings for specific patterns in JavaScript can be done in the following ways: ...
Read MoreCall a function with onclick() – JavaScript?
The onclick event is a fundamental feature for calling functions in JavaScript when users interact with HTML elements. This event allows you to execute JavaScript code in response to mouse clicks on buttons, links, or any clickable element. What is the Onclick Event? The onclick event is triggered when a user clicks on an HTML element. It's commonly used to execute JavaScript functions in response to user interactions, making web pages interactive and responsive. You can call a function using the onclick event in two main ways: Using the onclick Attribute ...
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