Error handling
shape
async and await are keywords introduced in Swift 5.5 to simplify writing asynchronous code. These keywords help manage concurrency and make asynchronous programming more readable and less error-prone compared to traditional callback-based methods like closures. @IBOutlet and @IBAction are attributes used in iOS development with UIKit (or SwiftUI in some cases, although the syntax differs). These attributes are used to connect UI elements in Interface Builder (the visual tool within Xcode) to your Swift code, enabling interaction between your user interface (UI) and the logic of your application. struct) are used to create custom data types, but they differ in several key aspects, primarily in how they manage memory, behavior, and mutability. Understanding these differences is crucial for choosing the right type for your application. map, filter, and reduce are powerful higher-order functions that operate on collections (such as arrays, sets, etc.) and allow you to transform, filter, or combine values in a concise and functional programming style. These functions are commonly used to manipulate data in a functional programming way. defer is a powerful control flow statement that allows you to execute a block of code just before the current scope exits, no matter how the scope is exited (whether through normal return, early exit due to an error, or other control flow mechanisms). The purpose of defer is to ensure cleanup code is always executed, even in the face of errors or early exits from functions. async/await in Node.js is syntactic sugar built on top of Promises that allows you to write asynchronous code in a more readable, synchronous-like manner. It simplifies the process of working with Promises and makes asynchronous code easier to manage and understand. this keyword in JavaScript refers to the context in which a function is called. Its value depends on how a function is invoked and can change dynamically. It is commonly used to access the properties and methods of the current object, but its behavior varies across different execution contexts.Here’s a breakdown of how this works in different situations: Startup class is central to configuring and initializing the application. It provides two key methods, ConfigureServices and Configure, each with distinct roles in setting up the application's services and request processing pipeline. req.body is an object that contains data sent in the body of an HTTP request. It is typically used in POST, PUT, and PATCH requests, where data is sent by the client (e.g., via forms, JSON, or other types of request bodies) to the server. find command in Linux and Unix-like systems is used to search for files and directories based on specific criteria such as name, type, size, and more. To search for a file in a specific directory, you can specify the directory path and use different options to narrow down your search. req.body is an object that contains data sent in the body of an HTTP request. It is typically used in POST, PUT, and PATCH requests, where data is sent by the client (e.g., via forms, JSON, or other types of request bodies) to the server. |) operator. let and var are both used to declare variables, but they differ in terms of mutability:- let: This keyword is used to declare constants, meaning the value assigned to the variable cannot be changed after it is set. Once a value is assigned to a let constant, you cannot modify it. This is similar to declaring an immutable reference.