why $ is need to access array [negative index]?

[mw]

On Friday, 18 September 2020 at 20:48:47 UTC, bachmeier wrote:
> I'm inclined to say typing a single character is not a hardship 
> in exchange for extreme clarity of the code. Keep in mind that

It not about saving "typing a single character".

In the example I showed,

signs[sign] = ...;  // the sign can be -1, 0, 1

in D, to write the same code, you have to test the sign and 
branch:

if (sign >= 0) {
   signs[  sign] = ...;
} else {
   signs[$+sign] = ...;  // remember + here
}