if_exception.ex

# =====================
# Explicit branch names
# =====================

branch OtherFile.read("./existing_file.txt"),
  value_do: String.length,
  exception_do: fn %{message: msg} -> msg end.()
# => 1000

branch OtherFile.read("./missing.file"),
  value_do: String.length,
  exception_do: fn %{message: msg} -> msg end.()
#=> "error message"

# ==========================
# Convenient if/else variant
# ==========================

if_exception OtherFile.read("./existing.file"), do: fn %{message: msg} -> msg end.(), else: String.length
#=> 1000

OtherFile.read("./missing.file")
|> if_exception do
    fn %{message: msg} -> msg end.()
  else
    String.length
  end
#=> "error message"