Notes

Inline Conditional Attributes in Pug.js

-
    var localePages = [{ "URL": "/en/about", "language": "en" }, { "URL": "/pt/about", "language": "pt" }, { "URL": "/fr/about", "language": "fr" }];
    var currentPage = { "URL": "/en/about", "language": "en" };

//- this
form
    select(name="locale")
        each page in localePages
            if page.language == currentPage.language
                option(value=page.URL selected) #{ page.language }
            else
                option(value=page.URL) #{ page.language }
        
//- becomes
form
    select(name="locale")
        each page in localePages
            option(selected=page.language == currentPage.language, value=page.URL)=page.language
            

output.html

<form>
	<select name="locale">
		<option value="/en/about" selected="selected">en</option>
		<option value="/pt/about">pt</option>
		<option value="/fr/about">fr</option>
	</select>
</form>