Prepend a character if string exists otherwise not

Question

I would like to prepend a '/' if the variable follow has a value otherwise if it is nil then keep it as nil

    l2, follow = params[:all].split('/', 2)
    follow     = follow.nil? ? follow : "/#{follow}"
    redirect_to "#{my_path(locale: locale, l2: l2)}#{rest}"

the params[:all] here could be a url path like

esp
esp/article/1
esp/article/1/author/1

EDIT: My approach works but would like to know if there is a better way

Answer 1

follow.nil? ? follow : "/#{follow}"

Since Ruby has String#prepend method, the code can be refactored the following way:

follow && follow.prepend("/")

Or since Ruby 2.3 has safe navigation, it can be expressed even more concise:

follow&.prepend("/")