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hey there its jason from codemanship with not a not a full-blown video video diary entry um just a short one this time but also this new laptop im recording on here has not been set up with video or anything yet um so this is going to be raw and hopefully fairly quick now i posted something on linkedin and twitter over the weekend um it was about um null checking in in core logic but it was maybe i was a bit being a bit too specific there really what i was talking about is invalid invalid data essentially checking for invalid data in your core logic my point was that you shouldnt need to do it really and the invalid data should not make it that far now i wanted to illustrate this with a very simple example which is a square root calculator you give it a number it calculates the square root but the number must be positive it must be greater than or equal to zero otherwise were going to end up in an infinite loop here so there is a precondition for this root function before we docHub
