diff options
Diffstat (limited to 'fsharp.html.markdown')
| -rw-r--r-- | fsharp.html.markdown | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/fsharp.html.markdown b/fsharp.html.markdown index 064a9fdd..f1f8e95d 100644 --- a/fsharp.html.markdown +++ b/fsharp.html.markdown @@ -33,6 +33,21 @@ let myInt = 5 let myFloat = 3.14 let myString = "hello" // note that no types needed +// Mutable variables +let mutable a=3 +a <- 4 // a is now 4. + +// Somewhat mutable variables +// Reference cells are storage locations that enable you to create mutable values with reference semantics. +// See https://learn.microsoft.com/en-us/dotnet/fsharp/language-reference/reference-cells +let xRef = ref 10 +printfn "%d" xRef.Value // 10 +xRef.Value <- 11 +printfn "%d" xRef.Value // 11 + +let a=[ref 0; ref 1] // somewhat mutable list +a[0].Value <- 2 + // ------ Lists ------ let twoToFive = [2; 3; 4; 5] // Square brackets create a list with // semicolon delimiters. @@ -633,6 +648,6 @@ module NetCompatibilityExamples = ## More Information -For more demonstrations of F#, go to the [Try F#](http://www.tryfsharp.org/Learn) site, or my [why use F#](http://fsharpforfunandprofit.com/why-use-fsharp/) series. +For more demonstrations of F#, go to my [why use F#](http://fsharpforfunandprofit.com/why-use-fsharp/) series. -Read more about F# at [fsharp.org](http://fsharp.org/). +Read more about F# at [fsharp.org](http://fsharp.org/) and [dotnet's F# page](https://dotnet.microsoft.com/languages/fsharp). |