On Friday, 19 July 2024 at 09:34:13 UTC, Lewis wrote:
```
string[3][string] lookup;
string[] dynArray = ["d", "e", "f"];
lookup["test"] = dynArray[0..$];
```
This fails at runtime with RangeError. But if I change that
last line to:
```
lookup["test"] = dynArray[0..3];
```
then it works. But the value of $ here is 3. Why do I get a
RangeError at runtime even though the slice is the correct size
(and the same size as the hardcoded one that works)? I would
have expected to only get a RangeError if at runtime the value
turned out to be wrong.
The simplest solution is to keep them consistent:
```
string[3][string] lookup;
string[3] dynArray = ["d", "e", "f"];
```
or
```
string[][string] lookup;
string[] dynArray = ["d", "e", "f"];
```
Avoid the temptation to mix static and dynamic arrays and your
life will be easier. If you run into a situation where it's tough
to avoid, use an explicit conversion:
```
lookup["test"] = dynArray.to!(string[3])[0..$];
```
(I don't know all the complicated under the hood stuff as others
do, but I know what works and why.)
