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// Gets a property from each of a list of objects (in a dependency) and
// provides the results.
//
// This doesn't alter any list indices, so positions which were null in the
// original list are kept null here. Objects which don't have the specified
// property are retained in-place as null.
//
// See also:
// - withPropertiesFromList
// - withPropertyFromObject
//
// More list utilities:
// - excludeFromList
// - fillMissingListItems
// - withFlattenedList
// - withUnflattenedList
//
import {empty} from '#sugar';
// todo: OUHHH THIS ONE'S NOT UPDATED YET LOL
export default function({
list,
property,
into = null,
}) {
into ??=
(list.startsWith('#')
? `${list}.${property}`
: `#${list}.${property}`);
return {
annotation: `withPropertyFromList`,
flags: {expose: true, compose: true},
expose: {
mapDependencies: {list},
mapContinuation: {into},
options: {property},
compute(continuation, {list, '#options': {property}}) {
if (list === undefined || empty(list)) {
return continuation({into: []});
}
return continuation({
into:
list.map(item =>
(item === null || item === undefined
? null
: item[property] ?? null)),
});
},
},
};
}
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