Access vue instance/data inside filter method

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According to Evan, the creator of Vue:

Use methods primarily for triggering state alterations. When you call a method, it generally implies some side effect.

Use filters primarily for simple text formatting that needs to be reused all across your app. Filters should be pure – no side effects, just data in and data out.

Use computed properties for local, component-specific data transforms. Similar to filters, computed getters should be pure.

There is a special case where you want to compute something using a scope variable that is only available in the template (e.g. a v-for alias), in such cases it’s okay to use “helper methods” so that you can compute something by passing it arguments.

(source: https://forum-archive.vuejs.org/topic/830/method-vs-computed-vs-filter/2)

So, since the filter depends on the component, I think you should use a computed property in this case instead of a filter.

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