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For a list of integers, I can simply write a typespec like this:
@type foo() :: [integer()] # or list(integer())
But what about a Strea...
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Last Three Year's Trending
Hello!
I’m trying to filter list of maps to remove items where value of key was declared previously in this list. List that I have:
lis...
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How would you leverage or translate an existing, clear Enum.reduce/3-alike struct method into a valid defimpl for Enumerable.reduce/3?
W...
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The Comprehensions article says:
In Elixir, it is common to loop over an Enumerable … Comprehensions are syntactic sugar for such const...
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Hello!
I’m trying to filter list of maps to remove items where value of key was declared previously in this list. List that I have:
lis...
New
Background
I have a structure where the new function requires a parameter to be part of a closed set of values (think of it as an enum). ...
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Is there a guard for testing protocol implementation?
is_proto/2
For example, how to guard test for implementing Enumerable?
I underst...
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Trending Over Three Years
I have a list say
x = ["23gh", "56kh", "97mh"]
I would like to pass each element to Val in each iteration.
Say, in iteration 1 -------...
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A proper list is a list that ends in an empty list, such as:
[1, 2, 3] (which is syntactic sugar for [1 | [ 2 | [3 | [] ] ] ] )
An im...
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what is the closest thing to Arrays in Elixir. By arrays I mean, a container for values which I can access in constant time.
I’ve looked...
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Sorry because many other people asked a similar question… but how do you implement the Enumerable protocol for a struct? I see the docs ...
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I wrapped an API using pagination with Stream.unfold so that it returns Enum.t (Enumerable.t).
Is it possible to specify @spec of value...
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Ultimately I’d like to update the values of keys in myMap based on whether the key is in myList and in myOtherList:
myList = ["a", "b", ...
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How would I map over something like this?
results = [
{"John Smith", %{"twitter" => "jsmith"}},
{"Lisa Smith", %{"twitter" =>...
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Example:
iex(1)> Enum.reduce([], fn x,y -> y end)
** (Enum.EmptyError) empty error
(elixir) lib/enum.ex:1754: Enum.reduce/2
...
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trades =
%{
"3QvxP6YFBKpWJSMAfYtL8Niv8KmmKsnpb9uQwQpg8QN2" => [
%{
asset: "3QvxP6YFBKpWJSMAfYtL8Niv8KmmKsnpb9uQwQpg8QN2",...
New
Hello, Elixir gang. I’m starting to get the hang of Elixir, which has been challenging since I’m not coming from Ruby. I have been strugg...
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Hey I a trying to make a login system for my phoenix app, but I am having an error on successful login attempt:
# protocol Enumerable no...
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Bin Counting elements in a collection by updating a counter map is much slower than first grouping the elements by bin and then count eac...
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I have a list of maps.
For example,
students = [%{ sid: 1, name: "Bob", score: 80}, %{ sid: 2, name: "Kelly", score: 60},.....]
I have...
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Like the title says, I want to pass a stream to two outputs.
I am looking for something like below:
function_which_returns_stream
|&...
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G’day OGs
I have this code as follows:
def create(conn, %{"a" => a_params}) do
with true <- someClause(),
a_params ...
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