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Articles on Trending Technologies
Technical articles with clear explanations and examples
Maekawa\'s Algorithm for Mutual Exclusion in Distributed System
Multiple processes may require concurrent access to common resources in a distributed system. Concurrent access to a shared resource, however, may result in mistakes and inconsistencies. A distributed mutual exclusion algorithm must be employed to manage access to shared resources in order to guarantee mutual exclusion. A distributed mutual exclusion technique, such as Maekawa's algorithm, ensures mutual exclusion between running processes in a distributed system. Only one process at a time can access a shared resource thanks to the algorithm, which is based on a voting system. Maekawa's algorithm A distributed mutual exclusion algorithm, such as Maekawa's algorithm, makes sure ...
Read MoreDifference between MacOS and OpenBSD
MacOS and OpenBSD are two independent operating systems with contrasting objectives and layout views. the firm's operating system, MacOS, has become confidential, though OpenBSD is an unrestricted open-source operating system that emphasizes privacy and software truthfulness. The choice across MacOS and OpenBSD is based on your specific needs and preferences. If you appreciate confidentiality and code preciseness and are comfortable with interacting with commands, OpenBSD could be a better choice. Below are a few of the beneficial effects of using MacOS and OpenBSD − Advantages of MacOS Simple-to-use graphical user interface − the operating system for Mac has ...
Read MoreWhy do I need underscores in Swift?
In Swift, underscores have many different uses for a different purposes. Here are some examples. Ignore unnecessary loop variables or return values. Absence of identifiers for external parameters in function calls. Even if they were initially specified as constants, making variables changeable. Ignoring tuple components or using discard values when managing errors. To Ignore a Value To ignore a value that a function or method returns in Swift, use an underscore. You could compose something like this, for instance, if you only worry about an operation's success or failure. This is the most common case you use in ...
Read MoreWhat\'s the cleanest way of applying map() to a dictionary in Swift?
In Swift, we can use the map() method to the dictionary to apply a transformation to the values of the dictionary. This method returns a newly created object with the same keys as the original dictionary but with the values transformed by the mapping function. Example 1: Transforming Values with a Closure In the following example, we are performing the multiplication on each value in the dictionary using the mapValues() function. We pass a closure that takes an argument. In the resulting dictionary, you can see that each value has been doubled. import Foundation let inputDictionary = [1: 2, 3: ...
Read MoreWhat\'s the best practice for naming Swift files that add extensions to existing objects?
There is no single "best" practice for naming Swift files that add extensions to existing objects, but here are some commonly used conventions − Object Prefix Followed by Functionality String+Utilities.swift − adds utility functions to the String class Array+Sorting.swift − adds sorting functions to the Array class UIColor+Extensions.swift − adds color-related functions to the UIColor class Functionality Prefix Followed by Object CustomView+Animation.swift − adds animation functionality to a custom view class called CustomView JSONEncoder+CustomEncoding.swift − adds custom encoding and decoding functionality to the JSONEncoder class UICollectionViewLayout+Extensions.swift − adds layout-related functions to the UICollectionViewLayout class Descriptive Naming ...
Read MoreLRU Cache implementation using Double Linked Lists
Caching is a technique to improve a computer's performance by storing frequently accessed data in a cache. The cache is a high-speed storage area in a computer. In this, data can be quickly retrieved from the cache rather than from slower main memory or disc storage whenever needed. Caching can be accomplished in a number of ways. This includes the use of a hash table, an array, or a linked list. In this article, we will explore the LRU Cache implementation using Double Linked Lists in detail. What is LRU Cache implementation? The Least Recently Used (LRU) algorithm is a ...
Read MoreLRU Approximation (Second Chance Algorithm)
Introduction In computer operating systems, the LRU (Least Recently Used) approximation algorithm, commonly called the Second Chance algorithm, is a page replacement algorithm. It is based on the principle that pages that haven't been used in a while are more likely to be replaced than pages that have. In this article, we will discuss the details, advantages, and disadvantages of this article. LRU Approximation Algorithm To keep track of which pages are currently in memory, the LRU approximation algorithm employs a circular buffer. Each page receives a reference bit, which is initially set to 0. When a page is accessed, ...
Read MoreSwift: declare an empty dictionary
In Swift, there are some different syntaxes to declare an empty dictionary. It is important to remember that all syntaxes produce the same result. In this article, you will see examples of how to declare an empty dictionary and define a dictionary in Swift. What is a Swift Dictionary? A dictionary is a collection in Swift that lets you keep key-value pairs. Each key in the dictionary has a corresponding value, and each word in the dictionary needs to be distinct. Because dictionaries are unordered, the sequence in which key-value pairs are introduced does not matter. Example In this example, ...
Read MoreSwift: Convert enum value to String?
In Swift, you can convert an enum value to a String through the rawValue property. This is if the enum has a raw value of type String. If the enum doesn't have a raw value, you can use the String(describing:) initializer to get a string representation of the enum value. Also, you can use the CustomStringConvertible protocol. Example 1 Convert an enum value to a string using the rawValue property.In this example, Fruit is an enum with a raw value of type String. The rawValue property is used to get a string representation of the myFruit enum value, which is ...
Read MoreSwift: Call can throw, but it is not marked with \'try\' and the error is not handled
In Swift, when you call a function that throws an error, you must either mark the function call with the try keyword or handle the error using a do-catch block. If you see the error message "Call can throw, but it is not marked with 'try' and the error is not handled", it means that you have called a function that can throw an error, but you have not handled the error properly. How to Fix These Errors? Mark the function call with the try keyword. For example − do { let result = try someFunctionThatCanThrow() ...
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