How to use variable in href link attribute?

Question

Pug

a(href="/characters/current - 1" class="new")
There is such a link, current, this is a variable, I tried to write
a(href="/characters/#{current - 1}" class="new")
it But it didn’t work, tell me how to do it right. Thank you!

Answer 1

- var current = 10;

a(href=`/characters/${current}` class="new")

codepen.io/werty1001/pen/GGMmLb