Swift 4 Recipes: Hundreds of Useful Hand-picked Code Snippets

© Yanis Zafirópulos 2019

Yanis ZafirópulosSwift 4 Recipeshttps://doi.org/10.1007/978-1-4842-4182-0_2

2. Basics

Yanis Zafirópulos¹ 

(1)

Granada, Spain

 

In this chapter, we will look into some basic constructs and conventions of the Swift programming language and help you get started writing your first program.

2.1 Create a Hello World

Problem

I want to write a Hello World program and write my first Swift program.

Solution

A single line does the trick. Hello World!

print("Hello World!")

How It Works

All we have to write is a single line of code, using the print function.

Hello World!

2.2 Declare variables

Problem

We want to declare some variables.

Solution

Declare a variable, without type.

var surname = "Doe"

Declare a variable, with type.

var fullName : String = "John ...