New Swift 5 Features while iOS App Development

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A fresh version of the Swift programing language is here. Swift 5 was released in March 2019. Swift 5.0 brings variety of changes also as some new features to form the event even simpler and better for swift app developers.


What’s the Update Process of Swift Programming Language?

First, all the changes to the Swift programing language are proposed and discussed during a GitHub repository called Swift Evolution.
Anyone curious about the language can propose the changes, but they have to follow a process. You’ll find many proposed changes which are discussed first, within the Swift Forums, then in communities.
then , each proposed change is publicly reviewed by the Swift core team, which consists of Apple engineers like Ted Kremenek and Chris Lattner. you’ll find an inventory of current and past proposals within the proposals directory of Swift Evolution.
A typical proposal usually includes source code and technical designs. If the proposal is accepted, the given ASCII text file is merged into the Swift source code.

The Result Type

Swift 5 introduces a replacement type called Result type for iOS app development. this sort works with two states of a passed result: success and failure, and thanks to its high popularity, it’s now available within the Swift standard library.

Result type encapsulates possible return values and errors in one object. It leverages the facility of enumerations and SWift 5 helps you write more meaningful code.

Flatten Nested Optionals With “try?”

Though it’s not wrong to use nested operators, they’re confusing and appear unnecessary. Sometimes they have a bigger number of operations for even doing an easy task. Swift 5 flatten the nested optional resulting from try? giving them an equivalent behavior as? and optional chaining. This also helps the developer keep code neat and clean.

The New “compactMapValues()” Function For Dictionary

The standard Swift library comes with two important functions for arrays and a dictionary.

map(_:) – It applies a function to array items and returns the resulting array.

compactMap(_:) – it discards array items that are nil.

On the opposite hand, The mapValues(_:) function does an equivalent for dictionaries except it doesn’t discard the nil array items. Swift 5 bring compactMapValues(_:) function for dictionaries.

It basically combines the compactMap(_:) function of arrays with the mapValues(_:) function of dictionaries for effective mapping and filtering values.

Standard Library Updates

Generics features for the quality library are an equivalent for Swift 4.2 and Swift 5. Here, we’ll discuss the new features of Swift 5.

The standard library in Swift 5 includes many new features aside from Swift 4.2 which help Swift programmers to manage their libraries well. a number of the main ones are as follows:

Improved Raw Text support for string literals.
SIMD and Result vector types are now available within the Swift 5 Standard Library.
String revamped with UTF-8 encoding for the performance boost.
Added more flexibility to construct text from data by enhancing String interpolation.
Performance improvements to Dictionary and Set

Package Manager Updates

Swift 5 brings variety of latest features in Swift Package Manager. It includes target-specific build settings, customized deployment targets, dependency mirroring, etc.

Furthermore, you’ll now import libraries during a REPL using the swift run command with none got to build an executable.

Additional Language and Compiler Updates

Another of the new features of Swift 5 is that the language and Compiler Updates.

Swift 5 comes with Exclusivity Enforcement by defaults and permit exclusive access to memory for both debug and release builds. It now supports dynamic callable types and helps improve interoperability with languages like JavaScript, Python, and Ruby.

Swift also added Literal initialization via coercion, Identity key path, and other proposals as a results of the Swift Evolution process.

String Interpolation

With Swift 5, the string interpolation has become more efficient and more flexible. they need created an entire range of latest Swift features that weren’t there in Swift 4.2.

In simple words, this new Swift release features a revamped string interpolation system that allows you to control how objects appear in strings as compared to Swift 4.2. Debugging is simpler using Swift because it’s default behavior for structs because it prints the struct name followed by all its properties. However, classes don’t have this behavior. If you’re working with a category and need to format the output to form it user-facing, you’ll use the new string interpolation system.

Dynamically Callable Types

Swift 5 package manager update supports dynamically callable types that help improve interoperability with dynamic languages like Python, JavaScript, and Ruby.

Parentheses operator overload from C++ is analogous to Dynamic calls, along side the keyword arguments from Python.

The major idea in Swift 5.0 is that you simply should be ready to pass any arguments thereto .

The tag names aren’t restricted to any method of header definition and may be called anything you favor . you’ll do dynamic calls in two ways

1. With labels and

2. Without labels where the input order doesn’t matter for using this feature.

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