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Category: computer science

Computer science: memoization

By Jack Posted on December 10, 2021 Posted in computer science No Comments

Tutoring computer science, terms arise. The tutor mentions memoization. Let’s imagine a function called F1. Let’s further imagine that F1 uses a lot of resources – calls to it take a lot of computation power. In such a situation, you …

Computer science: memoization Read more »

Comp sci: type parameter

By Jack Posted on December 7, 2021 Posted in computer science No Comments

Tutoring computer science, terms are important. The tutor mentions type parameter. The motivation for a type parameter is easiest to imagine with a strongly typed language like Java. Typically, such a language insists on knowing the type of an argument …

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Comp sci: static methods

By Jack Posted on November 30, 2021 Posted in computer science No Comments

Tutoring computer science, static methods can arise. The specific language does provide meaningful context in how a programmer perceives static methods. However, the general idea is that a static method can be invoked from the class itself rather than needing …

Comp sci: static methods Read more »

Comp Sci: code motion

By Jack Posted on November 24, 2021 Posted in computer science No Comments

Tutoring computer science, its own terms arise. The tutor mentions code motion. Code motion refers to evaluating a sentry value once, outside a loop, then storing the value in a variable which will be used for the test in the …

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Programming: newline in rhs expression: Python vs JavaScript

By Jack Posted on September 22, 2021 Posted in programming No Comments

Self-tutoring about programming: the tutor mentions a difference between Python and JavaScript he’s noticed. With Python, if you want to continue to the next line (perhaps for easier reading), it seems a backslash, then Return, will work: the_var= (3 + …

Programming: newline in rhs expression: Python vs JavaScript Read more »

Comp Sci: what is casting?

By Jack Posted on September 7, 2021 Posted in computer science No Comments

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 …

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Comp sci: regular expressions: newline in regex

By Jack Posted on September 5, 2021 Posted in PHP, regular expressions No Comments

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

PHP: regex: is hyphen a word character?

By Jack Posted on September 1, 2021 Posted in PHP No Comments

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 …

PHP: regex: is hyphen a word character? Read more »

SQL Server: triggers: rows affected

By Jack Posted on August 31, 2021 Posted in sql No Comments

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 …

SQL Server: triggers: rows affected Read more »

SQL Server: reveal a function

By Jack Posted on August 30, 2021 Posted in sql No Comments

Self-tutoring about the SQL Server query editor: the tutor mentions a hint. I defined a function, but then couldn’t find it. I wondered – was it even defined, or had I accidentally deleted it somehow? The command exec sp_helptext function_name …

SQL Server: reveal a function Read more »

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