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// After mapping the contents of a flattened array in-place (being careful to
// retain the original indices by replacing unmatched results with null instead
// of filtering them out), this function allows for recombining them. It will
// filter out null and undefined items by default (pass {filter: false} to
// disable this).
//
// See also:
// - withFlattenedList
//
import {input, templateCompositeFrom} from '#composite';
import {isWholeNumber, validateArrayItems} from '#validators';
export default templateCompositeFrom({
annotation: `withUnflattenedList`,
inputs: {
list: input({
type: 'array',
defaultDependency: '#flattenedList',
}),
indices: input({
validate: validateArrayItems(isWholeNumber),
defaultDependency: '#flattenedIndices',
}),
filter: input({
type: 'boolean',
defaultValue: true,
}),
},
outputs: ['#unflattenedList'],
steps: () => [
{
dependencies: [input('list'), input('indices'), input('filter')],
compute(continuation, {
[input('list')]: list,
[input('indices')]: indices,
[input('filter')]: filter,
}) {
const unflattenedList = [];
for (let i = 0; i < indices.length; i++) {
const startIndex = indices[i];
const endIndex =
(i === indices.length - 1
? list.length
: indices[i + 1]);
const values = list.slice(startIndex, endIndex);
unflattenedList.push(
(filter
? values.filter(value => value !== null && value !== undefined)
: values));
}
return continuation({
['#unflattenedList']: unflattenedList,
});
},
},
],
});
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