Templates frequently need to render a collection of values.

Jade provides each for iterating through arrays and objects.

ul
  each product in products
    li= product.name

Accessing the index

ul
  each product, index in products
    li #{index + 1}. #{product.name}

Empty collections

You can provide an else branch for an empty collection.

ul
  each product in products
    li= product.name
  else
    li No products found.

for

for can be used as an alias for each.

while

For situations where a traditional loop is more appropriate:

- var count = 0

while count < 3
  p= count++

These iteration patterns are part of the documented Jade/Pug template syntax.