Publish to my blog (weekly)

• Enum · Elixir School

  • All the collections that we learned about in the previous lesson, with the exception of tuples, are enumerables.
  • without producing a new value,
  • iterate over a collection
  • The each/2 function does return the atom :ok.
  • produce a new collection
  • specify a function to produce the minimum value
  • in case the enumerable is empty
  • include only those elements
  • filter the collection
  • evaluate to true using the provided function.

• Collections · Elixir School

  • /2
  • it (here ++) and its arity
  • pattern matching
  • Tuples are similar to lists, but are stored contiguously in memory
  • It is common for tuples to be used as a mechanism to return additional information from functions;
  • Keyword lists
  • the associative collections of Elixir.
  • • Keys are atoms.
     
    •  Keys are ordered.
     
    •  Keys do not have to be unique.
  • keyword lists are most commonly used to pass options to functions.
  • the “go-to” key-value store
  • they allow keys of any type and are un-ordered
  • %{} syntax:
  • variables are allowed as map keys:
  • If a duplicate is added to a map, it will replace the former value:
  • there is a special syntax for maps containing only atom keys:
  • :foo =>
  • :hello =>
  • a special syntax you can use with atom keys:
  • map.hello
  • his creates a new map)
  • %{map | foo: "baz"}
  • If the key does not exist, a KeyError will be raised.
  • Map.put(map, :foo, "baz")

Posted from Diigo. The rest of my favorite links are here.