1. Structs vs. Classes

Concurrency and Grand Central Dispatch

Concurrency lets you take advantage of the fact that your device has multiple CPU cores. To make use of these cores, you will need to use multiple threads. However, threads are a low-level tool, and managing threads manually in an efficient manner is extremely difficult.

Error Handling

Here is simple example how to use error handling in swift.

Stacks

1. Stacks - aLIFO/FILO Principle. Functions of
   1. push()
   2. pop()
   3. peek()
   4. isEmpty()
   5. capacity
   6. top - A stack is either empty or it consists of a top
2. Examples - stack of plates, undo mechanism - changes save in stack

OOPs Principles

Types of Design Patterns

There are mainly three types of design patterns:

Quick Reference

Here are few quick reference for interview preparation

https://medium.com/swift-india/swift-5-abi-stability-769ccb986d79

Swift 5.3 Features

1. Multi-pattern catch clauses

Concepts

Single-responsibility principle (SRP)

A class should only have a single responsibility, that is, only changes to one part of the software’s specification should be able to affect the specification of the class.

Definition

1. Associated types are a powerful way of making protocols generic, but they can be a bit confusing at first. In essence, they mark holes in protocols that must be filled by whatever types conform to those protocols.
2. Associated types work like generics.

Definition

Property wrappers is definitely one of the most exciting new features in Swift 5.1. Like the name implies, a property wrapper is essentially a type that wraps a given value in order to attach additional logic to it — and can be implemented using either a struct or a class by annotating it with the @propertyWrapper attribute. Besides that, the only real requirement is that each property wrapper type should contain a stored property called wrappedValue, which tells Swift which underlying value that’s being wrapped.

Quick Reference

1. Protocols are used to define a “blueprint of methods, properties, and other requirements that suit a particular task or piece of functionality.
2. Protocols allow developers to write flexible and extensible code in Swift without having to compromise the language’s expressiveness.

Definition

Semaphores and groups have, in a sense, opposite semantics. Both maintain a count. With a semaphore, a wait is allowed to proceed when the count is non-zero. With a group, a wait is allowed to proceed when the count is zero.

In this blog post, We’ll learn, how to use update method to update a value to realtime database in Firebase. This is an example written in react/react-native application

In this blog post, We’ll learn, how to use push method to add a value to realtime database in Firebase. This is an example written in react/react-native application

In this blog post, We’ll learn, how to develop a simple react native app, where user can click a button to open date picker, select a date and come back to previous screen, with the selected date displayed to a label

How to resolve the error The app delegate must implement the window property if it wants to use a main storyboard file swift

Here is my first ever post in the blog. I always like to see Hello world as first output, in any programming language.