Using Async Await to create asynchronous code.

asyncawait.js

/*
An aync function that takes two numbers and performs some operations
*/
performOperations(2,3).then(output => console.log(output)).catch(err => console.log(err));


async function performOperations(a,b) {

        let sum = await addTwoNos(a, b);
        let doubleOfSum = await double(sum);
        let squareOfDouble = await square(doubleOfSum);
        return await double(squareOfDouble);

}


async function addTwoNos(num1, num2) {

    if(isNaN(num1) || isNaN(num2))
        return await new Error('argument is not a number');
    else
        return await num2 + num1;
}


async function double(num) {

    if(isNaN(num))
        return await new Error('argument is not a number');
    else
        return await num * 2;
}


async function square(num) {

    if(isNaN(num))
        return await new Error('argument is not a number');
    else
        return await num * num;

}