Array is an ordered, random-access collection type. Arrays are one of the most commonly used data types in an app. We use the Array type to hold elements of a single type, the array’s Element type. An array can store any kind. Empty arrays The following three declarations are equivalent: …
Operators in Swift
Types of Operators 1. Assignment Operator Assigns the value on the right-hand side to the variable or constant on the left-hand side. (=) 2. Arithmetic Operators Swift provides standard arithmetic operators for mathematical operations: 3. Compound Assignment Operators These combine an operation with assignment, allowing you to update a variable …
Architecture Patterns
An architecture pattern, also known as a software architecture pattern, is a reusable solution to a commonly occurring problem in software design. It provides a predefined structure, guidelines, and best practices for organizing and building software systems. Architecture patterns help developers create scalable, maintainable, and modular applications by promoting separation …
Variables & Properties
Creating a Variable Declare a new variable with var, followed by a name, type, and value: var num: Int = 10 Variables can have their values changed: num = 20 // num now equals 20 Unless they’re defined with let: let num: Int = 10 // num cannot change Property …
Data Types
There are six basic types of data types in Swift programming. Character The character data type is used to represent a single-character string. We use the Character keyword to create character-type variables. For example String The string data type is used to represent textual data. We use the String keyword to create string-type variables. …
OperationQueue
It’s built on top of Grand Central Dispatch (GCD) and provides a higher-level abstraction for managing concurrent operations. It’s an abstract class and never used directly. We can make use of the system-defined BlockOperation subclass or by creating your own subclass and start an operation by adding it to an OperationQueue or …
Global Dispatch Queues
GCD provides a set of global dispatch queues that are managed by the system. These queues are categorised into different quality-of-service (QoS) classes, indicating their priority. Main Dispatch Queue: The Main Dispatch Queue is a special serial dispatch queue associated with the main thread of your application. It’s the primary …
Grand Central Dispatch (GCD)
Grand Central Dispatch is a low-level API provided by Apple for managing concurrent operations. GCD abstracts away many of the complexities of thread management and provides a simple and efficient way to execute tasks concurrently. It provides a set of APIs for managing tasks and executing them concurrently on multicore …
Concurrency & Multithreading
Thread A thread is the smallest unit of execution within a process. It represents a single sequence of instructions that can be scheduled and executed independently by the operating system’s scheduler. Multithreading The term “multithreading” refers to the use of multiple threads within a single process. Multithreading allows different parts …