Results in a boolean representation of a specific date.

Pass the specific date object firstly.
Use Date.getDay() to check weekend based on the day being returned as 0 – 6 using a modulo operation then return a boolean.

代码片段

const isWeekend = (t = new Date()) => {
  return t.getDay() % 6 === 0;
};

使用样例

isWeekend(); // 2018-10-19 (if current date is 2018-10-18)