How can I calculate X business days before a given date in JavaScript when I have an array of holidays to consider?
I am currently thinking about using a while loop to iterate through the dates and checking if it is a business day by comparing it with the list of holidays. Is this the most efficient way to achieve this task?
When it comes to solving problems in programming languages, the use of a hashset is typically the go-to solution due to its fast lookup times and random access capabilities.
However, in the world of Javascript, things work a bit differently. Instead of a hashset, an object is often used as the simplest way to achieve similar functionality. For example:
var holidays = {
1:true,
7:true,
18:true
}
While days since new year are commonly used, there's no restriction on using other identifiers like dates.
To streamline the process, a helpful function can be created:
var checkDate = function(value){
return holidays[value] === true;
};
Simply calling checkDate(dayOfYear) will efficiently determine if a particular day is a holiday or not. This can then be utilized in various scenarios, such as:
//Although more like pseudocode than actual javascript given my current skill level
while checkDate(--dayOfYear) === true)
previousBusinessDay = dayOfYear;
This demonstrates how an approach using objects in Javascript can efficiently handle tasks that may traditionally be solved with a hashset in other languages.
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