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If you are a Linux user or administrator, you might have heard of term "BCC tools" or "BPF Compiler Collection." BCC is a powerful set of dynamic tracing tools that provides a simple yet effective way to monitor system performance, networking, and much more. In this article, we will discuss what BCC tools are, their benefits, and how to use them with examples. What are BCC Tools? BCC (BPF Compiler Collection) is a set of dynamic tracing tools built on top of eBPF (extended Berkeley Packet Filter) technology in Linux kernel. eBPF is a virtual machine that runs inside kernel ... Read More
In Swift, we can use methods like dropFirst, Index(after:), and many others that can remove the first character of a string. In this article, we are going to learn various examples of these functions and understand how can we remove the first character of a string. Using the dropFirst method In this method, we are going to use the dropFirst method to remove the first character from the string and make the new string start with the second character. In case the original string is empty or has a single character in it, the result will be an empty string.Example ... Read More
As a developer, you might find yourself using command line interface (CLI) quite often. CLI allows you to interact with your computer through a terminal window and run commands to perform tasks. One of most popular shells used in CLI is Bash shell. Bash is a powerful tool, but it can be overwhelming to manage your scripts, aliases, and functions. This is where Bash-it comes in. Bash-it is a framework for managing your Bash configuration files. It provides a collection of scripts, aliases, and functions that you can use to customize your Bash environment. With Bash-it, you can easily control ... Read More
In Swift, you can pass an array by reference in a function as an argument using inout keyword. In Swift, arrays are value types by default. In other words, they pass a value rather than a reference. If you pass an array to a function as an argument, it makes a copy and passes that copy to the function. First, let's understand what happens when we pass an array in a function as a value. func passByValue(_ array: [Int]) { array.append(100) } let numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] passByValue(numbers) ... Read More
In Swift, working with JSON objects is very easy with the JSONDecoder class. It is always necessary to create model classes or structs with the Codable protocol. One single mistake leads you to fail to decode the complete JSON object. Let's explore some examples to understand when this failure might occur and how you can handle it in Swift. What is the JSONDecoder class? The JSONDecoder class is then used to parse the JSON data from the file into an instance of the given Type either a class or structure. The decode(_:from:) method is used to deserialize the JSON data, ... Read More
We can define a subclass that is inherited from a superclass in the Swift language, That means you can override its properties and methods using the override keyword. However, you cannot override the properties with a different type in the subclass. By default, the subclass must override the properties of the same type as the superclass type. For example, let's say you have a Person class with name and age properties of type String and Double − class Person { let name: String let age: Double ... Read More
URL encoding is an essential part of iOS app development. Many times, you will need to encode the URL to communicate with servers. Let's look at some examples of how you can encode an URL in Swift and Objective-C. URL Encoding in Swift In Swift, you can use the addingPercentEncoding(withAllowedCharacters:) method for URL encoding. URL Encoding in Objective-C In Objective-C, you can use the stringByAddingPercentEncodingWithAllowedCharacters method for URL encoding. Encode a URL in Objective-C In Objective-C, you can encode a URL string using the stringByAddingPercentEncodingWithAllowedCharacters: method of the NSString class. Here's an example NSString *stringToEncode = @"https://www.exampleserver.com/complete path with spaces"; ... Read More
In Swift, you can create an array using the ArraySlice type. The following examples will show how to use the ArraySlice type. You can create an extension as well to define the subscript method. Example 1 In the following example, we create an array of numbers with values from 0 to 9 and then create a range of indices from startIndex to endIndex (exclusive). Using this range we can generate an ArraySlice of the original array. In the end, we will convert the ArraySlice to an array using the Array initializer and print the result. import Foundation let numbers = ... Read More
In Swift, there are several ways to implement type constraints on types. We will use some common approaches like the where clause, protocol, etc. Generics provide lots of flexibility to write better and more secure code in Swift. We can apply generics to collections, custom types, etc. One of them is generic type constraints. Using type constraints, you can make your generic code behave that matches a certain set of constraints whatever you define. Swift provides multiple ways to specify type constraints on generic type parameters. Type constraints using the "where" clause The "where" clause in Swift is a highly ... Read More
Kubernetes is an open-source container orchestration platform that allows organizations to deploy, manage, and scale containerized applications. With its widespread adoption, Kubernetes security has become a crucial concern for businesses to ensure safety of their workloads. This article highlights six Kubernetes security best practices that can help secure your workloads. Implement Role-Based Access Control (RBAC) One of critical security features of Kubernetes is Role-Based Access Control (RBAC), which restricts users' access to Kubernetes API based on their roles and responsibilities. With RBAC, organizations can define roles for users, groups, or service accounts and assign specific permissions to perform actions within ... Read More