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In this article, we will learn to create an alert by clicking an HTML button in JavaScript. JavaScript is extensively utilized to increase user interactions on web pages. One of the widespread usage scenarios is to display an alert on a button click. What is an Alert in JavaScript? An alert is a built-in JavaScript function that displays a small pop-up or a dialogue box window containing a message.The syntax for using an alert is alert("Your message here"); This function pauses the execution of the script until the user dismisses the alert by clicking the "OK" button. Creating an ... Read More
In this article, we will learn to create a TreeSet with a custom Comparator in Java. TreeSet is a set that stores elements in sorted order. By default, elements are sorted in natural ordering (numbers in ascending order). Understanding TreeSet and Comparators Following are some key points for TressSet and Comparators − A TreeSet is a part of the Java Collections Framework and implements the NavigableSet interface. It automatically sorts elements as they are added. By default, it sorts elements using their natural ordering (determined by the ... Read More
In this article, we will learn to get the location of an element in Java. In Java, an ArrayList is used for storing and manipulating dynamic collections of elements. When working with an ArrayList, you might need to find the index (position) of a specific element. What is the indexOf()? The location of an element in an ArrayList can be obtained using the method java.util.ArrayList.indexOf(). This method returns the index of the first occurrence of the element that is specified. If the element is unavailable in the ArrayList, then this method returns -1. Syntax int index = arrayList.indexOf(element); Finding the ... Read More
The decrement operator in Javascript decreases an integer value by one. This operator is often utilized in loops, counters, and mathematical computations where a value has to be decreased sequentially. Types of Decrement Operators The decrement operator (--) can be used in two ways − Post-decrement (x--): It provides the current value of the variable prior to its decrement. Pre-decrement (--x): It first decreases the value and then returns the variable's new value. Syntax x--; // Post-decrement --x; // Pre-decrement Example Below is an example where the value of ... Read More
Counting characters in a string is a common task in programming, especially when analyzing text or creating applications that handle user input. Counting characters in a string without worrying about uppercase or lowercase letters is a common task in text processing and data analysis. JavaScript offers different methods to easily count how many times each character appears, regardless of case. Understanding Case Insensitive Case insensitivity in programming means that a system takes uppercase and lowercase letters as the same. For example, "Hello" and "hello" would be treated as equal in a case-insensitive situation. Case-Insensitive Character Counting You can ... Read More
For converting a Roman numeral into a decimal number, JavaScript provides simple and efficient ways. Roman numerals are a number system that started in ancient Rome and are still used today in different situations. Converting Roman numerals to decimal (integer) values can be useful in many applications, such as date conversions, numbering systems, or educational tools. In this article, we will see a JavaScript algorithm to convert Roman numerals into decimal numbers efficiently. Understanding Roman Numerals Roman numerals are a Number System that uses combinations of letters from the Latin alphabet to represent values. It uses seven letters to ... Read More
Sorting an object in ascending order by the value of a key is a common task in JavaScript. Objects are data structures, which are a collection of key-value pairs. Since objects in JavaScript are unordered collections, sorting them directly is not possible. This article will guide you on how to sort an object in ascending order by the value of a key in JavaScript. Understanding the Concept Suppose we have the following object: const obj = { "sub1": 56, "sub2": 67, "sub3": 98, "sub4": 54, ... Read More
In this article, we will learn to get the size of an ArrayList in Java. In Java, an ArrayList is a resizable array implementation of the List interface. Unlike arrays, which have a fixed length, an ArrayList dynamically grows as elements are added. Using the size() Method The size of an ArrayList can be obtained by using the java.util.ArrayList.size() method as it returns the number of elements in the ArrayList i.e. the size. Syntax int size = arrayList.size(); Getting the Size of an ArrayList Following are the steps to get the size of an ArrayList using the size() method − ... Read More
In this article, we will learn to perform cocktail sorting in Java. Cocktail Sort, also known as Bidirectional Bubble Sort, is a variation of the standard Bubble Sort algorithm. What is Cocktail Sort? Cocktail Sort works in contrast to bubble sort, wherein elements are iterated from left to right, and the largest element is first brought to its correct position, and so on. In cocktail sort, elements are iterated over in both directions (left and right) in an alternating fashion. Cocktail Sort Working Following are the steps to perform cocktail sort in Java − Traverse ... Read More
JavaScript has several built-in methods to create dialog boxes that allow users to interact with them. The prompt() method in JavaScript is one of them. The prompt dialog box is very useful when you want to pop up a text box to get user input. In this article, we'll explore how to use the prompt() method with examples. What is a Prompt Dialog Box? The prompt() method in JavaScript is used to display a dialog box that prompts the user for input. The prompt dialog box is very useful when you want to pop up a text box to ... Read More