Anjana Vakil

Get started with functional programming in JS through this  series of explainers & interactive exercises. 

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Functional JavaScript First Steps

But isn't referring to the new Date constructor making this impure? 🤔

Kartik Maurya

Hi Kartik, you're totally right that the new Date constructor introduces complexity that could potentially lead to impurity. But in this case, because of how Date works and the values we're passing in, we reasonably expect that every time we call this function, we will get the same output (i.e. it's deterministic). So for the purposes of this exercise, we can consider getWorkshopDate pure - although if e.g. someone went and changed the implementation of Date, such that calling it like this would not give a deterministic result, that could change! So your instinct that there's something a little weird here that could potentially make it impure is right :) Hope that helps!

That helps, thanks for the clarification :)

Awesome, no worries & sorry for the slow reply!