Using {{for array}} with filtering

[hkvstore]

I'd like to suggest supporting some JavaScript array functions, so it is not necessary to write and pass helper functions on rendering a template. The most common usage might be filtering, e.g.

{{for people filter=~ageRange minAge=20 maxAge=40}} => {{for people.filter(item => item.details.age > 20 && item.details.age < 40)}}...{{/for}}

Others usages:

{{for array sort=~compareFn}}...{{/for}} => {{for array.sort((a, b) => ...)}}...{{/for}}

{{for array reverse=true }}...{{/for}} => {{for array.reverse()}}...{{/for}}

{{for colors start=1 end=-1}}...{{/for}} => {{for colors.slice(1, -1)}}...{{/for}}

etc.

[BorisMoore]

Your examples with array.reverse() or colors.slice() should already work. But the array.sort() and people.filter() examples you show won't work, because you are declaring functions (in your example, arrow functions) inline, within the template markup. That is not something we will be able to support.