Posts about tech

Components run inside the LiveView process, but may have their own state and event handling. They are either stateless or stateful. Setting Phoenix.LiveComponent Calling Phoenix.LiveView.Helpers.live_component/3` in a parent LiveView Simplest Stateless Com Read more...

Unlike object-oriented programming languages, Elixir uses structs a lot. This requres a way to manipulate structs which is done by Enum and functions. all? applies a function to all elements iex> Enum.all?(["foo", "bar", "hello"] Read more...

WITH Assuming a chain of conditions: `` m = %{a: 1, c: 3} a = with {:ok, number} <- Map.fetch(m, :a), true <- is_even(number) do IO.puts “#{number} divided by 2 is #{div(number, 2)}” :even else :error -> IO.puts(“We don’t h Read more...

Convert string to integer or float # returns tuple e.g. {123.45, ""} Integer.parse(n) Float.parse(n) # returns integer String.to_integer(n) String.to_float(n) Decimal.new(n) |> Decimal.to_integer Decimal.new(n) |> Decimal.to_float Example &#3 Read more...

Repo Repo has a limited number of queries. Return a single record, and raise an error if more than one record is returned Repo.one Check for existence Repo.exists? Get the length of an model length(@posts) Get the count Repo.one(from p in Post, select: cou Read more...

Elixir hd head hd(array-name) #returns the first element or head _ _whatever #tells Elixir that `whatever` can be null tuple {} map %{} Pipe Operator |> passes output of earlier function into the next function due to the functional or flowing nature of Read more...

Live View is a Genserver that turns Elixir or Phoenix into a Websocket Server. This eliminates the need for Javascript frameworks like React or Vue. Live Components replace React Components. Though you can still use React if you want to make life difficult Read more...

Heroku 1 – On Heroku Dashboard, create an app named socrates 2 – On Heroku Dashboard, Go to Settings -> Buildpacks then add `hashnuke/elixir` and https://github.com/gjaldon/heroku-buildpack-phoenix-static.git 3 – In your app’s ro Read more...

Which is best for Free Static Site Hosting? Read more...

Here are some free online tools that we use to develop our own app and websites. I’ve put up this list for my own use in case I have to scrub data using a different computer, like the ones in internet cafes Machine Learning Tool Purpose Googl Read more...