It’s worth mentioning that inheritance and polymorphism aren’t exclusive to object-oriented programming. The real differ

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ourse name (the headline). You write down the benefits of the course (the subtitle). You write titles for 10–12 lessons you’re going to teach (the subheadings). You write points under each subheading (the body of a blog post). You include a list of takeaways at the end of each lesson (same as blog posts). You finish the course with a conclusion, then you let the students execute.

One of the reasons this niche is so interesting is because it earns abnormally high ad rates. Audiences interested in personal finance tend to have higher incomes, so companies are willing to spend more to reach them than they would for most other niches.

So if you’re thinking about starting YouTube with the goal of maximizing your income, take a long, hard look at the personal finance niche. There are lots of benefits, including the fact that it’s an increasingly hot topic. But mostly, you just might make a lot more money here than anywhere else.

So if you’re thinking about starting YouTube with the goal of maximizing your income, take a long, hard look at the personal finance niche. There are lots of benefits, including the fact that it’s an increasingly hot topic. But mostly, you just might make a lot more money here than anywhere else.

Note that this only covers the notion of encapsulation, that is, data and functions that sit inside an object are invisible to the outside. One can only interact with the contents of an object through messages, typically called getter and setter functions.

Then Alan Kay came around in 1966 or 1967 and theorized that one could use encapsulated mini-computers that didn’t share their data, but rather communicated through messaging. This way, compute resources could be used much more economically.

It’s more than just ad revenue too. Because people who watch personal finance videos are generally looking to improve their financial situation, they tend to be more likely to try recommended products. That’s how even small creators with less than 100,000 subscribers like Erika Kullberg can make $100,000 a year on YouTube. Not only are the ad rates higher, but their affiliate links convert better as well.

The main idea behind object-oriented programming is as simple as can be: you try to break a program in parts that are as powerful as the whole. It follows that you couple pieces of data and those functions that only get used on the data in question.

This meant that if you had a large set of data, you couldn’t do that much with it without pushing a computer to its limits. On the other hand, if you needed to do a lot of things, you couldn’t use too much data or the computer would take forever.

What is not contained in the initial idea, but is considered essential to object-oriented programming today, are inheritance and polymorphism. Inheritance basically means that developers can define subclasses that have all the properties that their parent class has. This wasn’t introduced to object-oriented programming until 1976, a decade after its conception.

That means creators who talk about money make more than they would for doing pranks, attempting stunts, or discussing meditation. Nate O’Brien recently noted that CPMs for his videos about finance are roughly $30, while CPMs for his videos about minimalism are just $13.

Polymorphism came to object-oriented programming another decade later. In basic terms, it means that a method or an object can serve as a template for others. In a sense it’s a generalization of inheritance, because not all properties of the original method or object need to be transmitted to the new entity; instead, you can choose to override properties.

But in recent years, the decade-old paradigm has received more and more criticism. Could it be that, four decades after object-oriented programming hit the masses, technology is outgrowing this paradigm?

Despite the ingenuity of the idea, it would take until 1981 until object-oriented programming hit the mainstream. Since then, however, it hasn’t stopped attracting new and seasoned software developers alike. The market for object-oriented programmers is as busy as ever.

What’s special about polymorphism is that even if two entities depend on each other in the source code, a called entity works more like a plugin. This makes life easier for developers because they don’t have to worry about dependencies at runtime.