转义 5 或 6 十六进制数字 Unicode 代码点

Question

In the Elixir documentation it says that you can use the following escapes:

• \xNN - A byte represented by the hexadecimal NN
• \uNNNN - A Unicode code point represented by NNNN

So what if I want to escape a codepoint that's longer than 4 hex digits, ie is outside the Basic Multilingual Plane, like U+1f692 FIRE ENGINE or all the Private Use characters?

Answer 1

There is one syntax that is not described on that page:

"\u{1f692}"

Answer 2

You can also use a binary: <<0x1f692::utf8>>

iex> cp = 0x1f692
iex> "Nee #{<<cp::utf8>>} naw"
"Nee 🚒 naw"

Or put it in a charlist [0x1f692] :

iex> "Nee #{[cp]} naw"
"Nee 🚒 naw"

Both of these are useful if you have the codepoint in a variable.