thisismydesign

void main() {
  // Typed variables raise type errors
  var typed1 = 1;
  // typed1 = '2';
  int typed2;
  // typed2 = '2';
  
  // Dynamic types don't raise type errors
  var a;
  a = 1;

thisismydesign

h.select(&:matcher)
#  => {:a=>"this"}
# Sorry what?

thisismydesign

# irb / rails c / whatever

h = { a: "this", b: "that" }

h.select{ |k, v| v.match?("this") }
#  => {:a=>"this"}

def matcher(string)
  string.match?("this")
end

thisismydesign

# https://github.com/rails/rails/issues/6769
# https://github.com/rails/rails/issues/10621
# https://stackoverflow.com/questions/19353507/eager-loading-the-first-record-of-an-association
# https://stackoverflow.com/questions/29142478/eager-load-only-first-associations-with-activerecord
# https://stackoverflow.com/questions/46415817/eager-loading-not-working-with-order-clause-in-rails
# https://stackoverflow.com/questions/52889750/eager-loading-with-scope-in-rails
# https://stackoverflow.com/questions/30056163/eager-loading-in-deep-level-nested-association
# https://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#module-ActiveRecord::Associations::ClassMethods-label-Eager+loading+of+associations
# https://stackoverflow.com/questions/29804377/rails-4-eager-load-limit-subquery
# https://stackoverflow.com/questions/6477614/how-do-you-do-eager-loading-with-limits

thisismydesign

jest.mock("MyOtherComponent", () => {
  return require
    .requireActual("TestUtils")
    .mockOriginalFunctionality("MyOtherComponent");
});

describe("<Component />", () => {
  it("works", () => {
    // MyOtherComponent works as usual
  }):

thisismydesign

export const mockOriginalFunctionality = name => {
  const actualModule = require.requireActual(name);

  return {
    ...Object.getOwnPropertyNames(actualModule)
      .map(functionName => {
        return {
          [functionName]: jest.fn().mockImplementation(() => {
            return actualModule[functionName]();
          })

thisismydesign

describe("<Component />", () => {
  it("works", () => {
    // ...
  }):
  
  describe("when something silly happens", () => {
    beforeEach(() => {
      jest.mock("MyOtherComponent", () => {
        // ...
      })

thisismydesign

// https://codeburst.io/javascript-null-vs-undefined-20f955215a2
// With default parameters, `null` does not use default parameters
let logDefault = (str = 'default') => {
  console.log(str);
}

logHi();
// => hi
logHi(undefined);
// => hi

thisismydesign

# db/seeds/test.rb
build_stubbed(:user)

def seed_user_pagination_data
  FactoryBot.create_list(:user, 10)
end

# user_spec.rb
it "returns user" do
  # ...

thisismydesign

# Gemfile
group :development, :test do
  gem 'factory_bot_rails', require: false
end

# For testing:
# spec_helper.rb / rails_helper.rb
require 'factory_bot_rails'

# For other envs, e.g. development