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In guard clauses, we typically invert the boolean expression to what we want to assert. If we want the user to be signed in to view this page, we want to check if they’re not signed in.
We are in the age of beautiful and interactive interfaces, UI and UX matters alot. We need to add these things to Command Lines and people have been able to achieve it and its officially used by popular companies like Heroku.
Cassandra has good support for modelling time series data wherein each row can have dynamic number of columns.