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I am constructing a JSON object (map) and I need to conditionally set a field. I’m trying to write proper elixir-way code… and I’m at a l...
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Hi folks,
I’m building a library and I have an interesting case when it comes to pattern matching with maps.
Would appreciate any help ...
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Hey everyone!
How can I keep the original ordering of a Map?
I’ve created one and notice that after the creation, the order of elements...
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I’ve got this bit of code; I’m wondering why create_or_open_room always creates a new room, even when there is an existing child process ...
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So I have found a pothole and I am not sure what the solution is.
I have a pretty standard JSON api in phoenix, I am using ecto, and I a...
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When you know that the map has only one key (from a guard for instance), is there something more efficient than this:
[{k, v}] = Map.to_...
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Trending Over Three Years
Original source of discussion: This topic on the Pragmatic Programmers' Functional Web Development with Elixir, OTP, and Phoenix forum.
...
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To my knowledge, put_in, Map.update etc. all have the one limitation of not automatically creating intermediate keys when needed (for exa...
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Hello, I have map which I want to convert it to string like this:
the map:
%{last_name: "tavakkoli", name: "shahryar"}
the string I ne...
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Having written a lot more Phoenix templates as of late, I’m doing a lot more attribute checks than I would like. In Ruby 2.3 we could use...
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Hello everybody,
As it’s possible to partially pattern match with maps like so:
iex> %{b: 2} = %{a: 1, b: 2, c: 3}
%{a: 1, b: 2, c: ...
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I’ve done a lot of GitHub searching but I can’t find an erlang/elixir data structure similar to Java’s SortedMap.
I’ve been using ETS :s...
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Hi,
I am relatively new to Elixir and need a support from more advanced users.
I try to do a simple thing → Flatten Map
But Elixir and...
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Hi,
so when I Map.put even if I use the string quotation marks on the key Elixir will render the map with atoms. This is further proble...
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Im trying to get one element and the rest of the map with pattern matching but I’m only get compile errors.
I came up with this:
%{“One...
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I have a key as a variable, I want to create a Map with a key :key1 or "key2" using one of the variables, but I'm unable to:
iex(24)&g...
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Hi,
I have a list of maps such as:
[%{x: a, y: 1}, %{x: a, y: 1}, %{x: b, y: 0}, %{x: b, y: 1}]
From this I would like to find out how...
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We can match arguments like this in elixir:
iex(1)> f = fn(a, [b: a]) -> a end
...
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Hello,
I have a collection like:
%{stats_a: [4, 5, 6], stats_b: [1, 2, 3]} # not actually integers (see next question)
Each of the 2 l...
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I’m sure this has been asked elsewhere (but forgive me I could not find something that addressed this specifically)…
Why do Elixir funct...
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Let’s a consider a theoretical case of building an in-memory stock exchange on Elixir.
A stock exchange has a limit order book, which is...
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