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authorKIM Taegyoon <steloflute@gmail.com>2024-02-26 06:50:46 +0900
committerGitHub <noreply@github.com>2024-02-25 22:50:46 +0100
commit51efc479330cb85c919222af054e82fb9f7e47d5 (patch)
tree15dd4d2f2e444fe27a0f778dbbd28ee3f106b6fa /fsharp.html.markdown
parent665c28c90e6c051f43d1fa3e3c2fe7543f3ae742 (diff)
[F#/en] added mutation (#4763)
Diffstat (limited to 'fsharp.html.markdown')
-rw-r--r--fsharp.html.markdown15
1 files changed, 15 insertions, 0 deletions
diff --git a/fsharp.html.markdown b/fsharp.html.markdown
index c140d6b1..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.