Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "Mount the downloaded WebStorm-10*.dmg disk image file as another disk in your system."

A block of code is set as follows:

fun main(args: Array<;String>) { 
   println("Hello, World!") 
}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

    apply plugin: 'kotlin' 
    apply plugin: 'application' 
    mainClassName = 'com.programming.kotlin.chapter01.ProgramKt'

Any command-line input or output is written as follows:

$ brew update
$ brew install kotlin@1.3.31

Bold: Indicates a new term, an important word, or words that you see on screen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "If this isn't the case, click the New button and navigate to where your JDK is."