how to implement map7 in Elm

Question

I need to use do this

input =
Signal.sampleOn delta <|
  Signal.map7 Key
    Keyboard.arrows
    (checknumcode '1')
    (checknumcode '2')
    (checknumcode '3')
    (checknumcode '4')
    (checknumcode '5')
    delta

but Signal do not have map7 How can I implement it?

marcosh · Answer 1 · 2016-01-20T12:14:07.933

2

If you are using the 2.1.0 version of the core package, you could use the Fancy Mapping (<~) and (~) operators that you find in the Signal package. From version 3.0 these functions are not in the core anymore, you can find them in the Signal Extra package

You could find here another explanation on how to use these operators

Your function would become something like

Key <~ Keyboard.arrows
    ~ (checknumcode '1')
    ~ (checknumcode '2')
    ~ (checknumcode '3')
    ~ (checknumcode '4')
    ~ (checknumcode '5')
    ~ delta

edited Jan 20 '16 at 12:14

answered Jan 19 '16 at 22:44

marcosh

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fancy map is not in core 3.0 anymore – SwordW Jan 20 '16 at 00:07
You can use the elm-signal-extra package if you decide you want them https://github.com/Apanatshka/elm-signal-extra – robertjlooby Jan 20 '16 at 02:48

score 0 · Accepted Answer · answered Jan 22 '16 at 15:03

0

I just merge some of the signal and use map3

answered Jan 22 '16 at 15:03

SwordW

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how to implement map7 in Elm

2 Answers2