Recently, I've been exploring the concept of creating new objects in JavaScript. It's interesting to note that in JS, every object creation is dynamic. This allows you to create an object and then add properties later on. Even fields created in the constructor are dynamic.
In many other languages, object structures are fixed and you can't add anything to an object after creation. So my question is, why are fields written in the constructor dynamically created in JavaScript?
Every programming language has its own unique design philosophy.
There are languages that prioritize strict structure and class access checks by requiring all members to be declared in advance, such as C and C++. While this approach catches errors during compilation, it also limits flexibility in program design.
On the other hand, some languages emphasize flexibility and incremental development through dynamic data structures and the ability to define new methods at runtime, like Javascript and Lisp. However, this flexibility can come at the cost of potentially missing errors that could have been caught by a stricter compiler.
Then there are languages like PHP that strike a balance between the two extremes, allowing properties to be added to classes but limiting the ability to add methods on the fly.
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