function createPromises(length) {
    const promises = [];
    for (let i = 0; i < length; i += 1) {
        const value = Math.random();
        promises.push(new Promise((resolve, reject) => setTimeout(() => {
            if (value < 0.1) reject('exception');
            resolve(value);
        }, value * 1000)));
    }
    return promises;
}

async function resolver(array) {
    const results = array.map(async (promise) => {
        try {
              const result = await promise;
              return result;
        } catch (err) {
            return 0;
        }
    });
    return results;
}

async function sum(promises) {
    try {
        const promised = await resolver(promises);
        const results = await Promise.all(promised);
        return console.log(results.reduce((a, i) => {
            a += i;
            return a;
        }, 0));
    } catch(err) {
        return console.log(err.stack || err);    
    }
}

sum(createPromises(100));