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+---
+title: addWeekDays
+tags: date,array,intermediate
+---
+
+Returns a date after adding given number of business days.
+
+- Use `Array.from()` to construct an array with `length` equal to the `count` of business days to be added.
+- Use `Array.prototype.reduce()` to iterate over the array, starting from `startDate` and incrementing, using `Date.getDate()` and `Date.setDate()`.
+- If the current `date` is on a weekend, update it again by adding either one day or two days to make it a weekday.
+
+```js
+const addWeekDays = (startDate, count) => 
+  Array
+    .from({ length: businessDayCount })
+    .reduce(date => {
+      date = new Date(date.setDate(date.getDate() + 1));
+      if (date.getDay() % 6 === 0)
+        date = new Date(date.setDate(date.getDate() + ((date.getDay() / 6) + 1)));
+      return date;
+    }, startDate);
+```
+
+```js
+addWeekDays(new Date('Oct 09, 2020'), 5); // 'Oct 16, 2020'
+addWeekDays(new Date('Oct 12, 2020'), 5); // 'Oct 19, 2020'
+```