From 9b7d5bee955cd64041fe0799d8c808ede05234a5 Mon Sep 17 00:00:00 2001 From: Jacob Ward Date: Tue, 15 Mar 2016 08:28:11 -0600 Subject: [fsharp/en] typos MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit dont -> don’t defintion -> definition --- fsharp.html.markdown | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) (limited to 'fsharp.html.markdown') diff --git a/fsharp.html.markdown b/fsharp.html.markdown index 809a1da2..e345201d 100644 --- a/fsharp.html.markdown +++ b/fsharp.html.markdown @@ -346,7 +346,7 @@ module DataTypeExamples = let trySendEmail email = match email with // use pattern matching | ValidEmailAddress address -> () // send - | InvalidEmailAddress address -> () // dont send + | InvalidEmailAddress address -> () // don't send // The combination of union types and record types together // provide a great foundation for domain driven design. @@ -426,7 +426,7 @@ module ActivePatternExamples = // ----------------------------------- // You can create partial matching patterns as well - // Just use underscore in the defintion, and return Some if matched. + // Just use underscore in the definition, and return Some if matched. let (|MultOf3|_|) i = if i % 3 = 0 then Some MultOf3 else None let (|MultOf5|_|) i = if i % 5 = 0 then Some MultOf5 else None @@ -627,7 +627,3 @@ module NetCompatibilityExamples = 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. Read more about F# at [fsharp.org](http://fsharp.org/). - - - - -- cgit v1.2.3 From 2f28300d10505c294ae1d805514c7d01636925f2 Mon Sep 17 00:00:00 2001 From: Wim Date: Thu, 4 Aug 2016 14:41:16 +0200 Subject: [fsharp/en] Explain the cons pattern, and introduce recursion keyword (#2310) * [fsharp/en] Explain the cons pattern, and introduce recursion keyword Was confused when reading the sieve function and thought it could be explained a little more. I got some help from http://hestia.typepad.com/flatlander/2010/07/f-pattern-matching-for-beginners-part-4-lists-and-recursion.html * Forgot the word 'notation' --- fsharp.html.markdown | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'fsharp.html.markdown') diff --git a/fsharp.html.markdown b/fsharp.html.markdown index e345201d..69f4eb60 100644 --- a/fsharp.html.markdown +++ b/fsharp.html.markdown @@ -175,7 +175,12 @@ module ListExamples = // list comprehensions (aka generators) let squares = [for i in 1..10 do yield i * i] - // prime number generator + // A prime number generator + // - this is using a short notation for the pattern matching syntax + // - (p::xs) is 'first :: tail' of the list, could also be written as p :: xs + // this means this matches 'p' (the first item in the list), and xs is the rest of the list + // this is called the 'cons pattern' + // - uses 'rec' keyword, which is necessary when using recursion let rec sieve = function | (p::xs) -> p :: sieve [ for x in xs do if x % p > 0 then yield x ] | [] -> [] -- cgit v1.2.3 From dcfbeeb614c92498c14b02f3b6840c52558e7c53 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=BCrgen=20H=C3=B6tzel?= Date: Sat, 12 Nov 2016 18:29:18 +0100 Subject: [fsharp/en] Use "elif" (#2566) --- fsharp.html.markdown | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'fsharp.html.markdown') diff --git a/fsharp.html.markdown b/fsharp.html.markdown index 69f4eb60..bbf477ba 100644 --- a/fsharp.html.markdown +++ b/fsharp.html.markdown @@ -408,11 +408,14 @@ module ActivePatternExamples = // "banana clips" are the syntax for active patterns + // You can use "elif" instead of "else if" in conditional expressions. + // They are equivalent in F# + // for example, define an "active" pattern to match character types... let (|Digit|Letter|Whitespace|Other|) ch = if System.Char.IsDigit(ch) then Digit - else if System.Char.IsLetter(ch) then Letter - else if System.Char.IsWhiteSpace(ch) then Whitespace + elif System.Char.IsLetter(ch) then Letter + elif System.Char.IsWhiteSpace(ch) then Whitespace else Other // ... and then use it to make parsing logic much clearer -- cgit v1.2.3