* What exactly is Closure in JavaScript? * Closures are functions that refer to independent (free) variables. In other words, the function defined in the closure ‘remembers’ the environment in which it was created. * In other words, a closure gives you access to an outer function's scope from an inner
What is meant by generator Function? A generator function is a special type of function in JavaScript that allows pausing and resuming its execution during runtime. Generator functions are defined using the function* and they use the yield keyword to pause the function's execution and produce a value.
Callbacks: I assume you know what callbacks are if you’re reading this blog. If you don’t, please read this blog for an introduction to callbacks before continuing. There, we talk about what callbacks are and why you use them in JavaScript. What is " Callback Hell " or
Events :- An event in JavaScript essentially represents an action or an occurrence that happens in the browser or on a webpage. These actions can be triggered by user interactions like clicking a button, hovering over an element, typing on the keyboard, or by system events like the page loading,
Troubleshooting Xcode for v15 Build Operation Errors Encountering errors during the build process in Xcode v15 can be frustrating. One common error is the "Build service could not create build operation" message, indicating an issue initiating a build operation, often due to a cache problem. Solution 1: Close
Kotlin: Collections - List Methods List is an immutable collection in Kotlin. List allows duplicate elements, and its size cannot be changed after initialization. 1 - getOrNull() - This method is used to get the value of required index and if that value is not found or out of bound
STEPS TO SOLVE : 1. Navigate to ios/Pods/Flipper/FlipperTransportTypes.h. 2. Change the includes: - Line no.10: Change `#include <string>` to `#include <functional>`. 3. Open Terminal, navigate to your project directory, and run the following commands: - `npm install --legacy-peer-deps` - `cd ios &
What are promises in JavaScript? * Promise is a special object in JavaScript. Promise provides us with a value after an asynchronous operation is successfully completed, even when the operation is completed but is not successfully due to timeout error or any other type o error. * Whenever an async operation is
What is Arrow Function? Arrow function {( ) =>} is concise way of writing JavaScript functions. The arrow functions in JavaScript allow us to create a shorter and anonymous function. Arrow functions were introduced in the ES6 version. They make our code more structured and readable. Why should you use arrow functions?
JavaScript is a language that handles multiple tasks simultaneously. This implies that JavaScript is an asynchronous programming language. Callbacks are a type of function that are a fundamental aspect of JavaScript. In this blog, we’ll look at what callbacks are, why they’re used, and how to use them
The useEffect Hook allows you to perform side effects in your components. It takes two arguments, first is setup function, a function with your effect's logic. and second is dependencies, which is an optional argument useEffect(<setup>, <dependencies>) Example: Dependencies is an optional argument,
Hooks allow function components to have access to state and other React features. Hooks allow us to "hook" into React features such as state and lifecycle methods. Types of Hooks: 1) useState() :This hook helps to manage state. You provide an initial value, and it returns two things:
o Higher Order Functions are functions that perform operations on other functions. o Higher-order functions are functions that make use of functions as either their argument or their return value. o Functions that get passed in as parameters are callback functions. o Functions can be passed into other functions as
-A function is a reusable block of code that groups together a sequence of statements to perform a specific task. -Function names can contain letters, digits, underscores, and dollar signs. -JavaScript doesn't have a function data type but when we find the data type of a function using
1.Safe Calls (?.) - If the object is null, the expression which is using the safe call operator will return null instead of throwing a - Null Pointer Exception. - It allows you to safely access properties or methods of an object that may be null. EXAMPLE OUTPUT EXAMPLE OUTPUT
Introduction: - In the dynamic landscape of software development, managing database schema changes efficiently is crucial for ensuring the stability and scalability of applications. Liquibase, an open source database. It's a free tool that helps you control and organize changes to your database . Chapter 1: What is LiquiBase?