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You can use the `join` built-in for that: `$joined_folders = $folders.join('-d ')`

The result is `/bar-d /foo`, since -d is used as a separator, so it is not present before the first folder

I could do "-d " + $folders.join(' -d '), but sometimes folders array is empty:)

<https://www.puppet.com/docs/puppet/7/function.html#map>

or in stdlib there is the prefix() function

Good to know, I'd probably just do the string concatenation but it does look a little ugly

`$watch_dirs.map |$x| { "-d ${x}" }.join(' ')`