Mechanics is defined as an area concerned with the behavior of objects subjected to forces or displacements, and the subsequent effects of those objects on their environment.
But when there are several possible methods of doing something, how can we determine which one is likely to work best? From there though, it can be more useful to go from specific to more generic code which allows us to handle a wider range of situations.
Specific code tends to be brittle when it comes to handling future changes. With the benefit of past experience though, we can look at common changes that occur and improvements that reduce number of times we need to revisit the code.
Invariably you will find that this means making the code more generic. It can be easy to make our code too generic to the point that it becomes difficult to understand. Striking a good balance between generic and readable is where we find improved code. As the tests get more specific, the code gets more generic.
Martin covers this idea well. The main benefit here is that generic code ends up being able to handle a wider range of situations and scenarios.
Looking at the above code, some obvious specific to generic improvements are immediately available. Storing the strings in variables would help us to manage them from the one place.
The onchange event handler is problematic in so far as it can be overwritten.
We should consider using addEventListener instead. The className property will overwrite existing class names. We should consider using classList instead.
If any of the identifiers or option values are changed, they can all be easily found in the one place, instead of hunting through the code for all of their occurences.React, Vue, Angular or vanilla JS - doesn't matter. Simply put, GSAP is the most robust high-performance animation library on the planet, which is probably why every major ad network excludes it from file size calculations.
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Like JS Arrays, ArrayLists are dynamic in size, so you can add and remove items, and the array will grow and shrink in size to fit. ArrayLists are also untyped, so you can add items of any kind, including a mixture of types in the same ArrayList.
TweenLite is an extremely fast, lightweight, and flexible animation tool that serves as the foundation of the GreenSock Animation Platform (GSAP). A TweenLite instance handles tweening one or more properties of any object (or array of objects) over time.