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Explain async andawait keywords

The async and await keywords are a newer syntax introduced in ECMAScript 2017 that allow developers to write asynchronous code in a synchronous style. They are based on promises and make it easier to write asynchronous code that is easier to read and understand.

const returnNum = (num) => num;

async function asyncSum(a, b) {
    const result1 = await returnNum(a);
    const result2 = await returnNum(b);

    return result1 + result2;
}

asyncSum(1, 2); // Promise with result 3