Solucionarioecuacionesdiferencialesdenniszill6edicion solucionarioecuacionesdiferencialesdenniszill6edicion Q: Can I make a type list readonly and return a random item? I have a type list that I initialize once and every time I call a function I want it to return a random item. type list = [] | {item: 'a list}[] let init = ['a', 'b', 'c']; let randN = function | {item} -> Random.int (0, 2) | [] -> Random.int (0, 2) | {item} :: _ -> Random.int (0, 2) init |> List.choose (fun y -> randN y) |> List.of_enum Doing that gives me a compiler error: The field 'item' is used by constructor Random.int in the type 'int' but is not exposed in the 'list' constructor Is there a way to accomplish this? A: If you are using F# 4.0, there is a more idiomatic way to achieve the same: // In F#, you can define a function without using a type annotation. let getRandomElement list = // In this case, it's possible to write // the type of the lambda as {x: string} -> int, but not // {item: 'a list} -> int Random.int (0, 2) |> fun r -> list |> List.tryPick r // In F#, it's idiomatic to use `list` for your variables, // not `init` as in your case. let init = ['a', 'b', 'c'] let randN list = getRandomElement list // The random function returns an F# unit value. // However, given that you can assign the result to a variable, // it is normal to write things as a function (albeit // a small one). randN init Note that you need to create a list in order to use tryPick (this is not the case in OCaml). This is because list is a covariant type alias in F#, which means that it's not possible to convert a solucionarioecuacionesdiferencialesdenniszill6edicion solucionarioecuacionesdiferencialesdenniszill6edicion solucionarioecuacionesdiferencialesdenniszill6edicion solucionarioecuacionesdiferencialesdenniszill6edicion solucionarioecuacionesdiferencialesdenniszill6edicion solucionarioecuacionesdiferencialesdenniszill6edicion Solucionarioecuacionesdiferencialesdenniszill6edicion >>> DOWNLOAD 4671a75073 E30. Solucionarioecuacionesdiferencialesdenniszill6edicion. May 28th, 2020 E32. Solucionarioecuacionesdiferencialesdenniszill6edicion >>> DOWNLOAD 0d49d0c9ac E29. Solucionarioecuacionesdiferencialesdenniszill6edicion. June 19th, 2020 E30. [OR] solucionarioecuacionesdiferencialesdenniszill6edicion. June 19th, 2020 E29. solucionarioecuacionesdiferencialesdenniszill6edicion. June 19th, 2020 E28. solucionarioecuacionesdiferencialesdenniszill6edicion. June 19th, 2020 E27. [P3D] / [MEDIATW] / [MESH] / [SEAT] / [LIGHT] / [SSR] / [TOOLBAR] solucionarioecuacionesdiferencialesdenniszill6edicion solucionarioecuacionesdiferencialesdenniszill6edicion solucionarioecuacionesdiferencialesdenniszill6edicion solucionarioecuacionesdiferencialesdenniszill6edicion solucionarioecuacionesdiferencialesdenniszill6edicion solucionarioecuacionesdiferencialesdenniszill6edicion 595f342e71
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