Hi there, I want to get the average height of a given list of people. Here is the associated code : people = [%{name: 'Mary', height: 160}, %{name: 'Paul', height: 180}, %{name: 'Hugo'}] heights = Enum.map(people, fn person -> Map.get(person, :height) end) …

Hi, I am at very nascent stage in elixir , was wondering how can we achieve below case scenario in elixir var doctors=[ { doctorNumber: "#9", playedBy: "Christopher Eccleston", yearsPlayed: 1 }, { doctorNumber: "#10", playedBy: "David Tennant", yearsPlayed: 6 }, { doctorNumbe…

[image] matt212: var doctors=[ { doctorNumber: “#9”, playedBy: “Christopher Eccleston”, yearsPlayed: 1 }, { doctorNumber: “#10”, playedBy: “David Tennant”, yearsPlayed: 6 }, { doctorNumber: “#11”, playedBy: “Matt Smith”, yearsPlayed: 4 }, { doctorNumber: “#12”, pl…

Woah, thanks a lot ,excellent ! can we also club filter with existing map, just curious though ! doctors = doctors.filter(function(doctor) { return doctor.begin > 2000; // if truthy then keep item }).map(function(doctor) { return { // return what new object will look like doctorNumb…

[image] matt212: Woah, thanks a lot ,excellent ! can we also club filter with existing map, just curious though ! The ‘traditional’ Elixir way of writing that is in one of two forms, either via Enum piping: doctors |> Enum.filter(fn doctor -> doctor.begin > 2000 end) |> Enum.map(fn doctor -> …

Thank you , sure moving forword will take the markdown factor into account. and also edited my queries as per markdowns

[image] matt212: Thank you , sure moving forword will take the markdown factor into account.and also edited my queries as per markdowns Awesome! The formatting looks perfect! Please ask if you have any other questions or conversions, I like the challenges. :slight_smile:

Hi , I have a query, I would like to make dynamic Sql statements for multiple where clauses in elixir and pass it across to raw queries. Please note i use sql.format in my nodejs code to prevent “SQL injection” my existing javascript code looks likes this var interns = [{ "name": "donnie" },…

Using strings for building SQL is risky. Fortunately with ecto, we don’t have to do it: user_params = [%{"age" => 19}, %{"name" => "matt213"}, %{"sex" => "male"}] user_params |> Enum.map(&Enum.to_list/1) |> Enum.reduce(Foo, fn [{key, value}], query -> field = String.to_existing_atom(key) search…

Hi, Apologise for earlier post of in process codebase and case scenarios this is my updated codebase; ui = [%{"age" => 19}, %{"fullname" => "todd"}] lists=ui |> Enum.map(&Enum.to_list/1) |> Enum.reduce(User, fn [{key, value}], query -> field = String.to_existing_atom(key) search…

You don’t want to do Repo.all inside the Enum.reduce callback. The idea is that reduce is reducing over a single query, building it up with each iteration. The return value of the Enum.reduce is the query that you want to execute. user_params = [%{"age" => 19}, %{"name" => "matt213"}, %{"sex" => "m…

Map, filter and reduce

Questions & Help Questions

OvermindDL1 January 24, 2017, 5:53pm 13

Awesome! The formatting looks perfect!

Please ask if you have any other questions or conversions, I like the challenges.