Filter Values By Type
Mix.install([
{:jason, "~> 1.4"},
{:kino, "~> 0.9", override: true},
{:youtube, github: "brooklinjazz/youtube"},
{:hidden_cell, github: "brooklinjazz/hidden_cell"}
])
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Home Report An Issue Built-In Elixir ModulesTic-tac-toeFilter Values By Type
Given a list of random items that could be any type, you are going to find all of the items that match a particular type.
Filter.floats([1, 2, 3, 4.0])
[4.0]
Filter.integers([1, 2, 3, 4.0])
[1, 2, 3]
Filter.maps(["hello", 4.0, %{key: "value"}, %{}])
[%{key: "value"}, %{}]
Implement the Filter
module as documented.
Example Solution
defmodule Filter do
def integers(list) do
Enum.filter(list, &is_integer/1)
end
def floats(list) do
Enum.filter(list, &is_float/1)
end
def numbers(list) do
Enum.filter(list, fn number -> is_number(number) end)
end
def atoms(list) do
Enum.filter(list, &is_atom/1)
end
def lists(list) do
Enum.filter(list, fn item -> is_list(item) and item != [] end)
end
def maps(list) do
Enum.filter(list, &is_map/1)
end
def keyword_lists(list) do
Enum.filter(list, &Keyword.keyword?/1)
end
end
Enter your solution below.
defmodule Filter do
@doc """
Filter in integers in list.
## Examples
iex> Filter.integers([1, 2, %{}, {}, []])
[1, 2]
"""
def integers(list) do
end
@doc """
Filter in floats in list.
## Examples
iex> Filter.floats([1, 2, %{}, {}, [], 1.2, 3.2])
[1.2, 3.2]
"""
def floats(list) do
end
@doc """
Filter in numbers and floats in list.
## Examples
iex> Filter.numbers([1, 2, %{}, {}, [], 1.2, 3.2])
[1, 2, 1.2, 3.2]
"""
def numbers(list) do
end
@doc """
Filter in atoms in list.
## Examples
iex> Filter.atoms([1, 2, %{}, {}, [], :first_atom, 1.2, 3.2, :second_atom])
[:first_atom, :second_atom]
"""
def atoms(list) do
end
@doc """
Filter in lists and keyword lists in list.
## Examples
iex> Filter.lists([1, 2, %{}, {}, [], 1.2, 3.2, :atom, [1, 2], [4, 5, 6]])
[[], [1, 2], [4, 5, 6]]
"""
def lists(list) do
end
@doc """
Filter in maps in list.
## Examples
iex> Filter.maps([1, 2, %{}, {}, [], 1.2, 3.2, :atom, %{key: "value"}])
[%{}, %{key: "value"}]
"""
def maps(list) do
end
@doc """
Filter in keyword lists.
## Examples
iex> Filter.keyword_lists([1, 2, %{}, {}, [], 1.2, 3.2, :atom, %{key: "value"}, [key: "value"]])
[[], [key: "value"]]
"""
def keyword_lists(list) do
end
end
Commit Your Progress
DockYard Academy now recommends you use the latest Release rather than forking or cloning our repository.
Run git status
to ensure there are no undesirable changes.
Then run the following in your command line from the curriculum
folder to commit your progress.
$ git add .
$ git commit -m "finish Filter Values By Type exercise"
$ git push
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