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doc: document the new const rule

This commit is contained in:
Alexander Medvednikov 2021-01-24 10:23:52 +01:00
parent 80e6b090ea
commit 12ff1c2702
2 changed files with 11 additions and 11 deletions

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@ -1716,15 +1716,22 @@ const (
blue = rgb(0, 0, 255)
)
println(numbers)
println(red)
println(blue)
println(main.numbers)
println(main.red)
println(main.blue)
```
Global variables are not allowed, so this can be really useful.
When naming constants, `snake_case` must be used. In order to distinguish consts
from local variables, the full path to consts must be specified. For example,
to access the PI const, full `math.pi` name must be used both outside the `math` module,
and inside it. This can be seen in the example above with `println(main.numbers)`.
vfmt takes care of this rule, so you can type `println(pi)` inside the `math` module,
and vffmt will automatically update it to `println(math.pi)`.
<!--
When naming constants, snake_case must be used.
Many people prefer all caps consts: `TOP_CITIES`. This wouldn't work
well in V, because consts are a lot more powerful than in other languages.
They can represent complex structures, and this is used quite often since there

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@ -1,7 +0,0 @@
vlib/v/checker/tests/var_duplicate_const.vv:8:2: error: duplicate of a const name `age`
6 |
7 | fn main() {
8 | age := 30
| ~~~
9 | println(age)
10 | }