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Developers can pick only the functions they need to reduce the size of the library that's being downloaded (using bundlers such as webpack or browserify)
Uses pure functions and always returns a new date object to prevent unexpected results.
Con Their "distance in words" function is not very customizable
When comparing a certain date to the current date the function returns a pretty "opinionated" sentence such as "almost 2 years" which can't really be customizable and requires string manipulation to fit result to your needs.