CODEWITHSUNDEEP
haskellelm
Bogdan Nechyporenko
Bogdan Nechyporenko

Reputation: 1346

Syntax in Haskell/Elm

Can't find anything about this syntax in Haskel/Elm:

bar day yOffset =
    rect
        [
            x <| toString <| (day.xOffset * (barWidth + barMargin)),
            y <| toString <| if day.amount <= 0 then yOffset
                else yOffset - day.amount,
            height <| toString <| abs day.amount,
            width <| toString barWidth
        ]
        [ Svg.title [] [ text day.day ] ]

min = List.map (\x -> x.words) lastTwoWeeks
            |> List.minimum
            |> Maybe.withDefault 0
            |> (\x -> if x > 0 then 0 else x)

What does mean <| and |> ?

Upvotes: 2

Views: 559

Answers (1)

Alexey Romanov
Alexey Romanov

Reputation: 170899

It isn't syntax, it's just a normal Elm function. From http://package.elm-lang.org/packages/elm-lang/core/3.0.0/Basics#%3C|:

(<|) : (a -> b) -> a -> b

Backward function application f <| x == f x. This function is useful for avoiding parenthesis

and similarly x |> f == f x. The Haskell equivalent of <| is called $, and |> is Data.Function.& (added in Base 4.8.0.0).

Upvotes: 9

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