variable in class name jade

Question

I can't set a variable name in a class in jade:

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.flag_#{ session.locale } #{ session.locale }

I have:

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<div class="flag_" >en</div>

And I'd like to have

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<div class="flag_en" >en</div>

Thanks

Answer 1

Try this (have not tested):

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div(class="flag_#{ session.locale }") session.locale

Answer 2

As for pug@2.0.0-alpha3 works this way:

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div(class="flag_" + session.locale) session.locale