Lấy ngày hiện tại trong javascript

const getDay = (fillFlag=true) => {
  const day = new Date().getDate()
  const dayRe = day
  if (fillFlag) day < 10 ? `0${day}` : day
  return dayRe
}

//Ouput:
console.log(getDay());//27

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.

Hàm lày ngày trong tuần javascript

flatMap()

Use flatMap() creates a new array with sub-array elements flattened by specified depth.

Merge Array

How to combine two sorted arrays into one? We can do this easily with the spread operator.

Convert Array-like to True Array