Arrays in F#

In F# we declare an array using square brackets, pipes and semi-colons as follows. Here’s how to declare an integer array with some elements:

let myArray = [|1;3;5;7;9|]

int [] = [|1; 3; 5; 7; 9|]

We can easily access individual members of the array using the .[] notation as follows:

let secondElement = myArray.[1]

secondElement will be 3. Indexing is 0-based just like in all popular programming languages, so the index 1 is the second element in the array.

The indexer can be used to extract a specific element from an array:

let arrayRange = myArray.[1..3]

arrayRange : int [] = [|3; 5; 7|]

Here’s how to extract all elements from the 2nd position until the last. We simply ignore the end index:

let arrayRange = myArray.[1..]

arrayRange : int [] = [|3; 5; 7; 9|]

We can similarly ignore the start index:

let arrayRange = myArray.[..3]

arrayRange : int [] = [|1; 3; 5; 7|]

View all F# related articles here.


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: Logo

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

Facebook photo

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

Connecting to %s

Elliot Balynn's Blog

A directory of wonderful thoughts

Software Engineering

Web development

Disparate Opinions

Various tidbits

chsakell's Blog


Once Upon a Camayoc

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

%d bloggers like this: