promiseAll.ts

promiseAll.ts

async function promiseAll<T = unknown>(promises: Promise<T>[]): Promise<T[]> {
    const results: T[] = []

    for (let i = 0; i < promises.length; ++i) {
        results.push(await promises[i])
    }

    return results
}

function promiseAll2<T = unknown>(promises: Promise<T>[]): Promise<T[]> {
    return new Promise((resolve, reject) => {
        const results: T[] = []

        promises.forEach(promise => promise.then(result => {
            results.push(result)

            if (results.length === promises.length) {
                resolve(results)
            }
        }).catch(reject))

        resolve(results)
    })
}