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// Flattens an array with one level of nested arrays, providing as dependencies
// both the flattened array as well as the original starting indices of each
// successive source array.
//
// See also:
// - withUnflattenedList
//
// More list utilities:
// - excludeFromList
// - fillMissingListItems
// - withFilteredList, withMappedList, withSortedList
// - withPropertyFromList, withPropertiesFromList
//
import {input, templateCompositeFrom} from '#composite';
export default templateCompositeFrom({
annotation: `withFlattenedList`,
inputs: {
list: input({type: 'array'}),
},
outputs: ['#flattenedList', '#flattenedIndices'],
steps: () => [
{
dependencies: [input('list')],
compute(continuation, {
[input('list')]: sourceList,
}) {
const flattenedList = sourceList.flat();
const indices = [];
let lastEndIndex = 0;
for (const {length} of sourceList) {
indices.push(lastEndIndex);
lastEndIndex += length;
}
return continuation({
['#flattenedList']: flattenedList,
['#flattenedIndices']: indices,
});
},
},
],
});
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