Self-tutoring about autos: the tutor makes an observation. I noticed a button on the driver side of the shifter knob on a 2007 Jeep Liberty. (It’s automatic, but I’ll still call it the “shifter knob.”) I’ve never used the button, …
Self-tutoring about cars and driving: the tutor mentions a surprise. For some reason, I’ve been wondering for a while now if the speedometer on a typical car works in reverse. I’ve been guessing “no,” since I can’t see a purpose …
Self-tutoring about Word: the tutor makes an observation. In my experience, in Word, for two paragraphs to behave as if they’re distinct, there must be a Return keystroke between them, and not Shift-Return.
Tutoring English, you might hear a new word. Is it new? The tutor investigates. Recently, I heard the word recency for the first time. Is recency even a word, and if so, is it new? Well, it’s in my 2004 …
Tutoring comp sci, casting will come up: the tutor defines it. Casting, in computer science, means changing a variable’s type to a different one. Typically, the result will be stored in a new variable. An example where casting might be …
Self-tutoring about regex: the tutor mentions the newline in a detection pattern. In PHP regex, \n means ‘newline’. Therefore, $pat=’/\n/’; will be found in a string containing a newline. Source: w3schools.com
Self-tutoring about probability: the tutor gets (perhaps) philosophical as well. Is the real probability of an event calculable from theory? First, let’s imagine tossing a coin. Theoretically, its probability of heads is 0.5 – tails, also 0.5. Let’s say you …
Self-tutoring about Covid: the tutor mentions some basic numbers. On Earth, about 2.8% of the population has gotten Covid, and about 2.1% of those who got it died from it. On Earth, about 3 in 5000 people have died of …
Self-tutoring about PHP and regular expressions: the tutor looks into whether hyphen is a word character. From time to time I wonder about this — I think I knew but have forgotten. Anyway, I’ve checked today and it seems that …
Self-tutoring about SQL Server: the tutor mentions a potential peculiarity. Let’s imagine there’s a trigger that updates a row just inserted. Performing an insert on such a table today, I got the message Query succeeded: Affected rows: 2 Yet, to …