Relational operators in F#

The relational operators in F# don’t behave in exactly the same way as they do in popular OOP languages like C# or Java.

The greater-than and less-than operators are the same, here’s an example:

let value = 5
let trueOrFalseGt = value > 5
let trueOrFalseLt = value < 5

The boolean values will be false as expected:

val trueOrFalseGt : bool = false
val trueOrFalseLt : bool = false

F# uses ‘=’ for equality as opposed to ‘==’ like in C# and Java:

let trueOrFalseEq = value = 5

val trueOrFalseEq : bool = true

So the equal sign in F# is used for both variable assignment and equality checking like in Visual Basic.NET .

Checking for inequality is a funny one:

<>

…so it’s nothing vaguely like ‘!=’ in C#:

let trueOrFalseNEq = value <> 5

val trueOrFalseNEq : bool = false

View all F# related articles here.

Advertisements

About Andras Nemes
I'm a .NET/Java developer living and working in Stockholm, Sweden.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

ultimatemindsettoday

A great WordPress.com site

iReadable { }

.NET Tips & Tricks

Robin Sedlaczek's Blog

Developer on Microsoft Technologies

HarsH ReaLiTy

A Good Blog is Hard to Find

Softwarearchitektur in der Praxis

Wissenswertes zu Webentwicklung, Domain-Driven Design und Microservices

the software architecture

thoughts, ideas, diagrams,enterprise code, design pattern , solution designs

Technology Talks

on Microsoft technologies, Web, Android and others

Software Engineering

Web development

Disparate Opinions

Various tidbits

chsakell's Blog

Anything around ASP.NET MVC,WEB API, WCF, Entity Framework & AngularJS

Cyber Matters

Bite-size insight on Cyber Security for the not too technical.

Guru N Guns's

OneSolution To dOTnET.

Johnny Zraiby

Measuring programming progress by lines of code is like measuring aircraft building progress by weight.

%d bloggers like this: