Hugo Silva hugohernani
hugohernani
/ smallest_arr_number.rb
Last active
April 23, 2021 16:55
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| class NumberFormatter | |
| def format(_number) | |
| raise NotImplementedError, "subclass should specify its formatting details" | |
| end | |
| end | |
| class NonPositiveFormatter < NumberFormatter | |
| def format(_number) | |
| "\n" # nothing to print | |
| end |
hugohernani
/ anagrams.exs
Created
February 18, 2021 03:56
Elixir code example on running agent and task to create a dictionary of anagrams (extracted from Thomas Dave book)
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| defmodule Dictionary do | |
| @name __MODULE__ | |
| ## API | |
| def start_link, | |
| do: Agent.start_link(fn -> %{} end, name: @name) | |
| def add_words(words), | |
| do: Agent.update(@name, &do_add_words(&1, words)) |
hugohernani
/ ar_model_required_attrs.rb
Created
March 11, 2016 17:47
Get Attributes which presence validator was added to a model_(instance|klass)
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| def required_attributes(obj) | |
| target = obj.class == Class ? obj : obj.class | |
| target.validators.select do |amv| | |
| amv.class == ActiveRecord::Validations::PresenceValidator | |
| end.map(&:attributes).flatten | |
| end |