Elm basic snippet

Elm

If

If and else are something different here without curly brackets {}

if "10" == "10" then "Its ten" else "Not ten"

If Not equal has different symbol here,

if "10" /= "11" then "Its ten" else "Not ten"

String Util

 - toInt

If you want to parse String to Int , this is the right util. The below method will return True if the String is parsable to Int or else otherwise Generaly String.toInt will return Result String Int , Which holds the Value / Error. The below method (validateStringToInt) would be the sample to extract the result value

String.toInt "10"`
Ok 10 : Result.Result String Int

validateStringToInt x =   
  case (String.toInt x) of
    Ok value -> True
    Err msg -> False

String Contact

Use ++ instead of regular + operator to concat. Every thing value here (Immutable) when doing contact it will give your new value

a = "one " ++ "two"
"one two" : String
a ++ "end"
"one twoend" : String

Tuple

- Tuple

Tuples are simple structure which hold the data in a order to server.

(10,11)

Access Tuple

fist element of the typle

fst (10,11)

second element of the tuple

snd (10,11)

Lambda expression

Forward slash for the parameter and -> function body

(\x -> x * 2)

Below code is for maping list to double list

double list = List.map (\x -> x * 2) list
<function> : List number -> List number
double [2,3,4]
[4,6,8] : List number

In Short lambda can be written like for single element , that automaticaly taken as default parameter

double list = List.map ((*) 2) list