In C/C++/Java/JavaScript, an if/for/while statement may be used with exactly one regular statement in its block, no more, no less. If you want the block to have no statements, you must use a ; to indicate an empty statement. If you want more than one statement, you must use {} to create a compound statement. This results in great controversy regarding the use of braces.

While doing exercise 1.12 from Structure and Interpretation of Computer Programs, I needed to learn an interesting technique for recursion. How does one write a nested loop in functional programming, i.e. recursively?

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I’ve recently discovered a new trend in object-oriented programming. These days, some people are saying that when writing a class, we should always prefer to use composition over inheritance. This means that whenever we feel tempted to inherit from another class, we should instead make that class an instance variable of our new class and write wrapper methods for the methods that we need to import into our new class. If you need polymorphic behavior, use interfaces to fit your static types into polymorphic variables.

First, a definition: