diff options
Diffstat (limited to 'elm.html.markdown')
| -rw-r--r-- | elm.html.markdown | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/elm.html.markdown b/elm.html.markdown index 96554e84..ad80adc9 100644 --- a/elm.html.markdown +++ b/elm.html.markdown @@ -51,18 +51,18 @@ not False -- True ["the", "quick", "brown", "fox"] [1, 2, 3, 4, 5] -- The second example can also be written with two dots. -[1..5] +List.range 1 5 -- Append lists just like strings. -[1..5] ++ [6..10] == [1..10] -- True +List.range 1 5 ++ List.range 6 10 == List.range 1 10 -- True -- To add one item, use "cons". -0 :: [1..5] -- [0, 1, 2, 3, 4, 5] +0 :: List.range 1 5 -- [0, 1, 2, 3, 4, 5] -- The head and tail of a list are returned as a Maybe. Instead of checking -- every value to see if it's null, you deal with missing values explicitly. -List.head [1..5] -- Just 1 -List.tail [1..5] -- Just [2, 3, 4, 5] +List.head (List.range 1 5) -- Just 1 +List.tail (List.range 1 5) -- Just [2, 3, 4, 5] List.head [] -- Nothing -- List.functionName means the function lives in the List module. @@ -72,8 +72,8 @@ List.head [] -- Nothing -- Access the elements of a pair with the first and second functions. -- (This is a shortcut; we'll come to the "real way" in a bit.) -fst ("elm", 42) -- "elm" -snd ("elm", 42) -- 42 +Tuple.first ("elm", 42) -- "elm" +Tuple.second ("elm", 42) -- 42 -- The empty tuple, or "unit", is sometimes used as a placeholder. -- It is the only value of its type, also called "Unit". @@ -150,10 +150,10 @@ answer = 42 -- Pass functions as arguments to other functions. -List.map double [1..4] -- [2, 4, 6, 8] +List.map double (List.range 1 4) -- [2, 4, 6, 8] -- Or write an anonymous function. -List.map (\a -> a * 2) [1..4] -- [2, 4, 6, 8] +List.map (\a -> a * 2) (List.range 1 4) -- [2, 4, 6, 8] -- You can pattern match in function definitions when there's only one case. -- This function takes one tuple rather than two arguments. @@ -180,7 +180,7 @@ fib n = else fib (n - 1) + fib (n - 2) -List.map fib [0..8] -- [1, 1, 2, 3, 5, 8, 13, 21, 34] +List.map fib (List.range 0 8) -- [1, 1, 2, 3, 5, 8, 13, 21, 34] -- Another recursive function (use List.length in real code). listLength aList = @@ -286,7 +286,7 @@ leftmostElement tree = -- Put this at the top of the file. If omitted, you're in Main. module Name where --- By default, everything is exported. You can specify exports explicity. +-- By default, everything is exported. You can specify exports explicitly. module Name (MyType, myValue) where -- One common pattern is to export a union type but not its tags. This is known @@ -335,10 +335,10 @@ $ elm repl -- Packages are identified by GitHub username and repo name. -- Install a new package, and record it in elm-package.json. -$ elm package install evancz/elm-html +$ elm package install elm-lang/html -- See what changed between versions of a package. -$ elm package diff evancz/elm-html 3.0.0 4.0.2 +$ elm package diff elm-lang/html 1.1.0 2.0.0 -- Elm's package manager enforces semantic versioning, so minor version bumps -- will never break your build! ``` |