Liquidjs divided_by not compatible with Ruby/Shopify Liquid

[Nowaker]

https://shopify.github.io/liquid/filters/divided_by/

The result is rounded down to the nearest integer (that is, the floor) if the divisor is an integer.Input

{{ 16 | divided_by: 4 }} => 4
{{ 5 | divided_by: 3 }} => 1

Liquidjs:

{{ 5 | divided_by: 3 }} => 1.6666666666666667

[harttle]

As stated here: https://liquidjs.com/tutorials/differences.html, in JavaScript we cannot distinguish integer and float, they're just numbers. For example, I can't find a way to implement this:

{{ 5 | divided_by: 3 }} // expect 1
{{ 5.0 | divided_by: 3 }} // expect 1.6667

[Nowaker]

@harttle I'll provide a conforming implementation this week.

[Nowaker]

@harttle Using lodash:

  engine.registerFilter('divided_by', (dividend, divisor) => {
    if (_.isInteger(divisor)) {
      return _.floor(dividend, divisor)
    } else {
      return dividend / divisor
    }
  })

[Nowaker]

I can submit a PR at a later point (1-3 weeks) or you can use transform it to TS yourself right away. Up to you :)

[harttle]

The point is can you pass this test case?

{{ 5.0 | divided_by: 3 }} => 1.6666666666666667

If not, we'll need an heuristicInteger option for it's breaking.

[Nowaker]

@harttle Yeah, you're right... I just found this definition of divided_by broke other parts of my code.

[Nowaker]

Actually, your example is incorrect. The rule is if the divisor is an integer. What you want is:

{{ 5.0 | divided_by: 3 }} // 1
{{ 5 | divided_by: 3 }} // 1
{{ 5.0 | divided_by: 3.0 }} // 1.6667
{{ 5 | divided_by: 3.0 }} // 1.6667

However, my code still fails:

1 // 1
1 // 1
1 // 1.6667
1 // 1.6667

Still working on it though. I'll keep you updated.

[Nowaker]

Okay. There's no way to fix it on the filter level. We'd have to detect 5.0 on the parsing stage, and use our own wrapping type to differentiate between float and integer. I'm not that good with JavaScript to do it for you.

[harttle]

What if the divider is a variable?

I mean we can keep it simple and imperfect, then enable this detection only when heuristicInteger option is set. If this imperfect detection is useful for you.

[Nowaker]

...Or maybe - rather than introduce value wrapping, why don't we introduce two extra arguments that are passed to divided_by?

  engine.registerFilter('divided_by', (dividend, divisor, dividendType, divisorType) => {

with dividendType and divisorType returning float or int for informational purpose, so that divided_by can do its job.

And yes, if divider is a variable, it doesn't work. But I think it's still worth it. It gets us a little closer to Liquid compatibility.

[github-actions[bot]]

:tada: This issue has been resolved in version 9.37.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket:

[harttle]

Supported another argument to enable integer arithmetic:

{{ 5 | divided_by: 3, true }}