In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Elements of code such as language keywords, operators, expressions and value names are shown as follows: "In order to define recursive function let binding can be extended with modifier rec", "Literal "$42" is bound to value total"

A block of code is set as follows:

type OrderType = Sale | Refund
type Transaction = Transaction of OrderType * decimal

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

// Imperative monolithic solution a-la C/C++

#load "HugeNumber.fs"

let number = hugeNumber.ToCharArray()

URLs are shown as https://jet.com.

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "Clicking the Next button moves you to the next screen."