PUG how to set variable in class name?

Question

Pug

I didn’t find a pug on the site (mb searched badly), how to add a variable to the class name in the mixin? For example, to
.b-content-img-
assign numbers to k, i.e. .b-content-img-1 etc?

Answer 1

img(class=`b-content-img-${number}`)

Answer 2

If you need to add the value of a variable to the class, then do this:

- var class_name = 'my_class'
div(class="" +class_name )

Compiles:
<div class="my_class">