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// Applies a filter - an array of truthy and falsy values - to the index-
// corresponding items in a list. Items which correspond to a truthy value
// are kept, and the rest are excluded from the output list.
//
// TODO: It would be neat to apply an availability check here, e.g. to allow
// not providing a filter at all and performing the check on the contents of
// the list (though on the filter, if present, is fine too). But that's best
// done by some shmancy-fancy mapping support in composite.js, so a bit out
// of reach for now (apart from proving uses built on top of a more boring
// implementation).
//
// TODO: There should be two outputs - one for the items included according to
// the filter, and one for the items excluded.
//
// See also:
// - withMappedList
// - withSortedList
//
// More list utilities:
// - excludeFromList
// - fillMissingListItems
// - withFlattenedList, withUnflattenedList
// - withPropertyFromList, withPropertiesFromList
//
import {input, templateCompositeFrom} from '#composite';
export default templateCompositeFrom({
annotation: `withFilteredList`,
inputs: {
list: input({type: 'array'}),
filter: input({type: 'array'}),
},
outputs: ['#filteredList'],
steps: () => [
{
dependencies: [input('list'), input('filter')],
compute: (continuation, {
[input('list')]: list,
[input('filter')]: filter,
}) => continuation({
'#filteredList':
list.filter((item, index) => filter[index]),
}),
},
],
});
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