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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | 1x 1x 11x 10x 9x 8x 420x 420x 94x 1x | const { mapIterable } = require('./helpers'),
{ validateIsIterable, validateIsFunction } = require('./validation');
/**
* Async Find Index
*
* Find an item's index asynchronously and resolve when found or all callbacks resolve
* @async
* @param {any[]} iterable
* @param {Function} callback - callback(currentValue, index, array)
* @param {any} [thisArg=undefined]
* @return {Promise<Number>} - an integer index, -1 if not found
* @throws {TypeError}
*/
async function asyncFindIndex(iterable, callback, thisArg = undefined) {
validateIsIterable(iterable);
validateIsFunction(callback);
const tasks = mapIterable(iterable, callback.bind(thisArg), {
useEmptyElements: true
});
return Promise.race([
Promise.race(
tasks.map(async (task, index) => {
const checkIsFound = await task;
return new Promise(resolve => checkIsFound && resolve(index));
})
),
Promise.all(tasks).then(taskResults =>
taskResults.findIndex(result => result)
)
]);
}
module.exports = { asyncFindIndex };
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