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