Calculate the number of difference days between two dates

const diffDays = (date, otherDate) => Math.ceil(Math.abs(date - otherDate) / (1000 * 60 * 60 * 24));

// diffDays(new Date('2014-12-19'), new Date('2020-01-01')) === 1839

Rest Operator for Objects

Now we can use rest on the properties of an Object. It allows us to explicitly extract certain named variables, and assign any uncalled variables into a catchall Object.

Promise.all là gì?

Promise.all là gì? Hiểu và sử dụng promise all trong những trường hợp nào trong vòng 1 phút.

Spread Operator for Objects

Using the spread operator during an Object declaration will assign the properties of the referenced Object to the new Object.

Calculate the number of difference days between two dates

group by property javascript use reduce