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Versions: 26
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Contents
/**
* Given an AsyncIterable and a callback function, return an AsyncIterator
* which produces values mapped via calling the callback function.
*/
export function mapAsyncIterator(iterable, callback) {
const iterator = iterable[Symbol.asyncIterator]();
async function mapResult(result) {
if (result.done) {
return result;
}
try {
return {
value: await callback(result.value),
done: false,
};
} catch (error) {
/* c8 ignore start */
// FIXME: add test case
if (typeof iterator.return === 'function') {
try {
await iterator.return();
} catch (_e) {
/* ignore error */
}
}
throw error;
/* c8 ignore stop */
}
}
return {
async next() {
return mapResult(await iterator.next());
},
async return() {
// If iterator.return() does not exist, then type R must be undefined.
return typeof iterator.return === 'function'
? mapResult(await iterator.return())
: {
value: undefined,
done: true,
};
},
async throw(error) {
if (typeof iterator.throw === 'function') {
return mapResult(await iterator.throw(error));
}
throw error;
},
[Symbol.asyncIterator]() {
return this;
},
};
}
Version data entries
26 entries across 26 versions & 1 rubygems