# `Cldr.Gettext.Interpolation.V2`
[🔗](https://github.com/elixir-cldr/cldr_messages/blob/v2.0.1/lib/cldr/gettext/interpolation_v2.ex#L1)

Gettext interpolation module that supports both ICU MessageFormat v1
and MessageFormat 2 (MF2) messages.

Messages are compiled as V2 first; if the V2 parser fails, the V1
parser is tried as a fallback. At runtime, `Cldr.Message.format/3`
auto-detects the version. This allows the same `.POT` files to
contain both v1 and v2 messages, all tagged with `icu-format`.

### Defining a Gettext Interpolation Module

```elixir
# CLDR backend module
defmodule MyApp.Cldr do
  use Cldr,
    locales: ["en", "fr", "ja"],
    default_locale: "en",
    providers: [Cldr.Number, Cldr.Message],
    gettext: MyApp.Gettext
end

# Define an interpolation module that handles both v1 and v2
defmodule MyApp.Gettext.Interpolation do
  use Cldr.Gettext.Interpolation.V2, cldr_backend: MyApp.Cldr
end

# Define a gettext module
defmodule MyApp.Gettext do
  use Gettext, otp_app: :my_app, interpolation: MyApp.Gettext.Interpolation
end
```

Now you can use `Gettext` with both message formats:

    # V1 message
    gettext("{greeting} world!", greeting: "Hello")
    #=> "Hello world!"

    # V2 message (auto-detected by leading `{{`)
    gettext("{{Hello {$name}!}}", %{"name" => "World"})
    #=> "Hello World!"

---

*Consult [api-reference.md](api-reference.md) for complete listing*