Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
In this article, we will learn to set the object keys by variable in JavaScript. Objects are dynamic collections of properties. We can use variables to add or change properties rather than using static keys. This is specifically helpful when handling dynamic data, like user input. Dynamic Key Assignment In JavaScript, object properties can be retrieved and assigned using bracket notation ([ ]). It enables the use of a string or variable as the key, so dynamic assignment of object properties is possible. Syntax object[variable] = value; Here, the object is the target object, the variable is the variable containing ... Read More
In this article, we will learn about the DatabaseMetaData getURL() method in Java. The DatabaseMetaData interface provides useful methods to obtain details about the database and the JDBC driver. One such method is getURL(), which returns the URL of the JDBC driver being used. What is the getURL() Method? The getURL() method in Java's DatabaseMetaData interface is used to retrieve the URL of the database to which the current connection is established. Syntax String dbUrl = metaData.getURL(); This method retrieves the URL of the underlying Database Management System and returns it in the form of a String variable. ... Read More
The zfill() method in Python is used to pad a string with leading zeros to achieve a specified total length. If the string is already longer than the specified length, zfill() does nothing. Syntax Following is the syntax for the zfill() method string.zfill(width) Consistent File Naming Consistent file naming with leading zeros is crucial for sequential processing scripts because it ensures correct sorting and handling of files. Example Here, even though i ranges from 1 to 10, each number is formatted to have three digits with leading zeros, ensuring consistent filename length. for i in range(1, 11): ... Read More
Python provides built-in functions to convert strings into numerical data types like integers and floats. However, it's crucial to handle errors that may arise when a string cannot be properly converted (eg, trying to convert "abc" to an integer). Following are several methods to parse a string to float or int. Using int() and float() with Error Handling The most straightforward approach is using the int() and float() functions directly within a try-except block to catch ValueError exceptions. Example In the following example, the try block attempts to convert the string. If the conversion fails, a ValueError is raised. The ... Read More
The string formatting operator ('%') in Python is used for string formatting, allowing you to embed variables or values directly into a string. It's often referred to as "printf-style" string formatting because it's similar to the sprintf() function in C. How it Works The % operator takes a format string on the left and a value (or tuple of values) on the right. The format string contains placeholders (like %s, %d, %f, etc.) that indicate where and how the values should be inserted into the string. Basic String Insertion (%s) The %s placeholder is used to insert strings into a string. ... Read More
When working with databases, especially MySQL, handling dates correctly is crucial. Python's datetime module provides powerful tools for managing dates and times. To insert a date into a MySQL database, which has a column of DATE or DATETIME type. Following are several methods to achieve this. Using strftime() for Formatting Using isoformat() Method Passing datetime object directly to the connector Using 'strftime()' for Formatting The strftime() method allows you to format a datetime object into a string according to a specific format. The '%Y', '%m', '%d', ... Read More
File manipulation is a fundamental aspect of programming, especially when dealing with data processing and management. Python offers powerful tools for handling files and text efficiently. A common task is searching for specific text patterns within a file and replacing them with desired content. This article explores several practical methods for searching and replacing text in a file using Python. Basic Text Replacement Let's start with a simple example of searching for a specific word in a file and replacing it with another word. In this particular example, we'll search for the word "old" and replace it with "new" − ... Read More
Hard links in Python can be created using several methods. Hard links allow you to create multiple names for the same file on the filesystem, meaning changes made to one will reflect in the other. Below are three methods to create hard links. Using os.link() Using os.system() with Shell Command Using subprocess.run() Using 'os.link()' Method The most straightforward way to create a hard link in Python is by using the os.link() method, which is built into the OS module. This method takes two arguments: the source file (`src`) ... Read More
Gradient borders add a modern and visually appealing touch to web elements, making them stand out. However, achieving this effect in CSS isn’t straightforward because the border property doesn’t natively support gradients. This article explores practical workarounds to implement gradient borders, ensuring your designs remain vibrant and dynamic. We’ll cover three methods, complete with code examples and outputs, to help you master this technique. Prerequisites Before diving into gradient borders, ensure you have: Basic HTML Knowledge: Familiarity with creating elements like . CSS Fundamentals: Understanding properties like border, background, and ... Read More
In this article, we will learn to focus on a particular element with a div class in JavaScript. In JavaScript setting focus on an element is commonly done using the focus() method. What is the focus() method? The focus() method in JavaScript is used to bring a specific element into focus. This means the element becomes active, allowing the user to interact with it, such as typing in an input field or highlighting a section of the webpage. Syntax element.focus(); Here, the element is the DOM element that will receive the focus. Using JavaScript to Focus on a Class Element ... Read More