/**
 * Below functions are executed against array of random
 * numbers of length 10000000. i.e numArray, which has a
 * length of 10000000.
 */
const processData = () => {
    const start = Date.now();
    numArray.map(num => num * 99).reduce((acc,num) => acc+num);

    const timeTaken = Date.now() - start;
    console.log(timeTaken);
}

const processDataInLoop = () => {
    const start = Date.now();
    let total = 0;
    for(let i=0; i< numArray.length; i++){
        total = total + numArray[i] * 99;
    }

    const timeTaken = Date.now() - start;
    console.log(timeTaken);
};

processData(); // 8229ms
processDataInLoop(); // 16ms