position: fixed; top: auto !important; margin-left: 112px;

Swift Basic Syntax

In this swift tutorial we will create our first Swift Program with Playground in Xcode. Xcode is basically an Apple's official Integrated Development Environment(IDE) which contains a set of Tools which will help you to create swift Apps.

The very first thing you need to get started with iOS App Development in Swift is to create a developer account, Visit Accounts Tab on top after visiting the Apple Developers page, set up your Apple Id and Download Xcode. This is all you need to do at the beginning.

Open Xcode , File -> New -> Playground > Enter Playground Name > Choose platform iOS > Next. You will see a playground screen like this,

Swift First Program

import UIKit

var str = "Hello, playground"

Output :-

You see output at bottom of the playground. Quite easy and handy tool. Right ?

import statement is used to import Objective-C frameworks which includes libraries etc.

print is used to print the variable named str.

; semicolon is not necessary in Swift language unless you don't write multiple statements on a single line.

Comments in Swift

Comments are used to ease the program understanding. What will this particular function will do is written in Comments so that when you or any other programmer refers the code, it will be easy to understand.

// Single line comments are written by using two slashes.

/* This is multiple 
      line comment */


The Identifier is a name used to identify a variable, function, or any other user-defined item. An identifier starts with a letter A to Z, a to z, or an underscore '_' followed by zero or more letters, underscores, and digits (0 to 9). Swift does not allow punctuation characters such as @, $, and % within identifiers. Swift is a case-sensitive programming language. Thus, Programming and programming are two different identifiers in Swift.

abc , _abc , abc_123 are valid identifiers
$abc,#abc,abc$ are not valid identifiers . 

Tokens in Swift:-

A Swift program consists of various tokens and a token is either a keyword, an identifier, a constant, a string literal, or a symbol. There are 4 tokens in the given example below.

print                           --> 1st token
(                                --> 2nd token
str                              --> 3rd token
)                                --> 4th token            

Semicolon in Swift

Unlike many other languages, Swift does not require you to write a semicolon (;) after each statement in your code, although you can do so if you wish. However, semicolons are required if you want to write multiple separate statements on a single line.

let name = "Manish"; print(name)

Previous Next Article


Largest collection of up-to-date tutorials to learn programming languages. We are focused on easy learning. Massive collection of interview questions one may need for preparation.

Social Profile


Copyright 2018. All rights reserved.