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Coord

Playing with coordinates and moves See https://github.com/giuliohome/AdventOfCode2019/blob/master/Day15-Part1-QueueVersion.fs#L54-L66

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//Only four movement commands are understood: north (1), south (2), west (3), and east (4).
type Position = {X:int;Y:int}
let back = function
    | 1L -> 2L
    | 2L -> 1L
    | 3L -> 4L
    | 4L -> 3L
    | _ -> failwith "wrong direction"
let moveTo = function
    | 1L -> fun position -> {position with Y = position.Y + 1}
    | 2L -> fun position -> {position with Y = position.Y - 1}
    | 3L -> fun position -> {position with X = position.X - 1}
    | 4L -> fun position -> {position with X = position.X + 1}
    | _ -> failwith "wrong direction"
Position.X: int
Multiple items
val int : value:'T -> int (requires member op_Explicit)

Full name: Microsoft.FSharp.Core.Operators.int

--------------------
type int = int32

Full name: Microsoft.FSharp.Core.int

--------------------
type int<'Measure> = int

Full name: Microsoft.FSharp.Core.int<_>
Position.Y: int
val back : _arg1:int64 -> int64

Full name: Script.back
val failwith : message:string -> 'T

Full name: Microsoft.FSharp.Core.Operators.failwith
val moveTo : _arg1:int64 -> (Position -> Position)

Full name: Script.moveTo
val position : Position

More information

Link:http://fssnip.net/7Xr
Posted:4 years ago
Author:giuliohome
Tags: function , function composition , list , pattern matching

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