Is there any way to automatically adjust OS specific environment variables, path, etc. format?

Question

Often in my scripts I have some ugly snippets like the following:

vim9script
var bin = ""
if has("win32")
    bin = "\\bin"
else
    bin = "/bin"
endif

g:path_with_bin = g:path .. bin

The same happens when it comes to environment variables since they are expressed as $MY_VARIABLE syntax in OSX and Linux systems and %MY_VARIABLE% in Windows (at least when using cmd.exe).

I am wondering if there are functions that recognise the OS and prevent us to explicitely use conditionals, something like

g:path_with_bin = g:path .. adjust_slashes(bin)

that sets slash-backslashes automatically depending on the OS, or, for environment variables, something like the following:

env_var_set(MY_VARIABLE, value)

which set $MY_VARIABLE or %MY_VARIABLE% to value depending on the OS.

Answer 1

For environment variable you can use within Vim the Unix syntax:

:echo $foo
let $foo = 'bar'

For the path I believe you can also use the Unix syntax (/ separated path) for all the Vim API.