In Nunjacks, I'm looking for a way to add comma seperation for each 'thousands' block. I can do this with a custom filter, but I would like to understand if this is possible directly in the .njk template (i.e. without defining a filter).

Desired behaviour:

• 1 outputs as 1
• 10 outputs as 10
• 100 outputs as 100
• 1000 outputs as 1,000
• 10000 outputs as 10,000
• etc...

Using a filter

Currently, I can do this with a custom filter (using toLocaleString as suggested by this SO post).

var env = new nunjucks.Environment();
env.addFilter('localizeNumber', function (num) {
  return num.toLocaleString()
})

with usage:

{{ 1000 | localizeNumber }}

Without a filter

If possible, I would like to achieve the same behaviour without a filter. Is this possible?