How can the exit code of a subshell be obtained using pipes?

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To obtain the exit code of a subshell using pipes, you can use the pipe symbol "|" to pass the output of the subshell to another command or process. Then, you can use the special variable "$?" to get the exit code of the last executed command.

For example:

(subshell command here) | (some other command or process)
echo "Exit code: $?"

In this example, the output of the subshell is passed to "some other command or process" through the pipe. After that, the "echo" command prints the exit code of the subshell using the "$?" variable.