Add to_float_or/2

lib/transformer.ex

@@ -21,11 +21,11 @@ defmodule Transformer do
       iex> Transformer.to_integer_or("a", nil)
       nil
 
-      iex> Transformer.to_integer_or("a", & &1 <> &1)
-      "aa"
+      iex> Transformer.to_integer_or("a", &{:error, &1})
+      {:error, "a"}
 
   """
-  @spec to_integer_or(integer() | String.t() | nil, any()) :: integer() | any()
+  @spec to_integer_or(any(), any()) :: integer() | any()
   def to_integer_or(value, substitute \\ & &1)
 
   def to_integer_or(value, _substitute) when is_integer(value) do
@@ -73,10 +73,10 @@ defmodule Transformer do
       iex> Transformer.to_integer_list_or([1, 2])
       [1, 2]
 
-      iex> Transformer.to_integer_list_or(["a", 2], nil)
-      [nil, 2]
+      iex> Transformer.to_integer_list_or(["a", 2], &{:error, &1})
+      [{:error, "a"}, 2]
   """
-  @spec to_integer_list_or(String.t() | list(), any(), String.t()) :: list()
+  @spec to_integer_list_or(any(), any(), String.t()) :: list()
   def to_integer_list_or(value, substitute \\ & &1, split_pattern \\ ",")
 
   def to_integer_list_or(value, substitute, split_pattern) when is_binary(value) do
@@ -88,4 +88,57 @@ defmodule Transformer do
   def to_integer_list_or(value, substitute, _) when is_list(value) do
     value |> Enum.map(&to_integer_or(&1, substitute))
   end
+
+  @doc """
+  Convert to float without error.
+  If it cannot be converted, it returns a substitute.
+
+  ## Examples
+
+      iex> Transformer.to_float_or(1)
+      1.0
+
+      iex> Transformer.to_float_or(1.2)
+      1.2
+
+      iex> Transformer.to_float_or("2")
+      2.0
+
+      iex> Transformer.to_float_or("a")
+      "a"
+
+      iex> Transformer.to_float_or("a", nil)
+      nil
+
+      iex> Transformer.to_float_or("a", &{:error, &1})
+      {:error, "a"}
+
+  """
+  @spec to_float_or(any(), any()) :: float() | any()
+  def to_float_or(value, substitute \\ & &1)
+
+  def to_float_or(value, _substitute) when is_float(value) do
+    value
+  end
+
+  def to_float_or(value, _substitute) when is_integer(value) do
+    value * 1.0
+  end
+
+  def to_float_or(value, substitute) when is_binary(value) do
+    try do
+      String.to_float(value)
+    rescue
+      _ ->
+        try do
+          String.to_integer(value) * 1.0
+        rescue
+          _ -> to_substitute(value, substitute)
+        end
+    end
+  end
+
+  def to_float_or(value, substitute) do
+    to_substitute(value, substitute)
+  end
 end

mix.exs

@@ -1,7 +1,7 @@
 defmodule Transformer.MixProject do
   use Mix.Project
 
-  @version "0.0.1"
+  @version "0.0.2"
   @source_url "https://github.com/ByeongUkChoi/transformer"
 
   def project do