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Optionals Chainings by Example - Swift Programming Language

1. Introduction An optional in Swift is a type that can hold either a value or no value. Optionals are written by appending a ? to any type: var optionalName: String? = "Developer Insider" print(optionalName) //prints "Optional("Developer Insider")" Optionals are one of the most

iPhone X - iOS Developer Guide

iPhone X features the stunning 5.8-inch Super Retina display, enabling even more immersive app experiences. Start testing your apps now to make sure they are ready to take advantage of the Super Retina display by respecting safe areas, supporting adaptive layouts, and more. Let's learn how to design your

Operator Declarations by Example - Swift Programming Language

An operator is a special symbol or phrase that you use to check, change, or combine values. For example, the addition operator (+) adds two numbers, as in let i = 1 + 2. Swift supports most standard C operators and improves several capabilities to eliminate common coding errors. Like, the assignment operator

Dictionary by Example - Swift Programming Language

Overview A collection whose elements are key-value pairs. A dictionary is a type of hash table, providing fast access to the entries it contains. Each entry in the table is identified using its key, which is a hashable type such as a string or number. You use that key to

Set by Example - Swift Programming Language

Overview An unordered collection of unique elements. You use a set instead of an array when you need to test efficiently for membership and you aren’t concerned with the order of the elements in the collection, or when you need to ensure that each element appears only once in

Array by Example - Swift Programming Language

Overview An ordered, random-access collection. you use the Array type to hold elements of a single type, the array’s Element type. An array can store any kind of elements—from integers to strings to classes. 1. Creating and Initializing an Array 1.1 Creating an Array Swift makes it

Turbo C++ Error - Unable to Open Include File 'STDIO.H'

This problem occurs due to wrong configuration in Turbo C++ directories. Follow these steps to fix the problem - Step 1 - Open Turbo C++. Step 2 - Go in Options menu. Step 3 - Then in Directories... Step 4 - Replace the directories with following - Include Directories -&

How to run (16-bit) .exe files output by Turbo C++?

If your PC is running on 32/64 bit Windows OS, then the older 16-bit application (output by Turbo C++) would not run on it. Here the steps to run a 16-bit .exe files output by Turbo C++. Step 1. Download and Install the latest version of Turbo C++ from
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