How often I should be using const? Is it useless/overrated?

[thebluepandabear]

On Friday, 18 November 2022 at 11:51:42 UTC, thebluepandabear 
wrote:
> A question I have been thinking about whilst using D is how 
> often I should be using const.
>
> Many people claim that all variables should be const by 
> default, but whether or not it is really needed is debatable 
> and oftentimes making everything const could cause readability 
> issues and make the code more complex.
>
> I also wonder how important const really is, like 99% of the 
> time you will know when your variable will be changed, and even 
> when a variable changes it's not like it is the end of the 
> world.
>
> Also, there is no real end to how much variables can be const. 
> Oftentimes -- interestingly -- in popular repos I don't even 
> see const being used, this is what confuses me.
>
> As a newcomer, I'd be interested in hearing everyones thoughts.

Some languages like Kotlin and Rust are const by default, but for 
languages that are not like D I have always wondered how often 
you should use const.