As we mentioned in the introduction, strings are binaries. In this recipe, we will use the binary concatenation operator (<>) to join strings.
In this recipe, we will use an IEx session, so let's start it by entering iex in our command line.
To join (concatenate) two strings, follow these steps:
Define
string_one:iex(1)> string_one = "Hello" "Hello"
Define
string_two:iex(2)> string_two = "World" "World"
Join both strings:
iex(3)> string_one <> string_two "HelloWorld"
Make it look a lot better:
iex(4)> string_one <> " " <> string_two <> "!" "Hello World!"
The Kernel module defines a macro to concatenate two binaries. Think of this macro as a <> operator that works by appending the binary defined on the right-hand side to the binary defined on the left-hand side. In step 3, we used previously defined strings and concatenated them using <>.
The operation is associative. In step 4, we concatenated...