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Updated SC2004 (markdown)

Vidar Holen
2018-11-08 08:32:34 +08:00
parent cb26ccff7b
commit 6c3a02fc5f
1 changed files with 3 additions and 3 deletions
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6
SC2004.md

@@ -3,18 +3,18 @@
### Problematic code:
```sh
echo $(($n+1))
echo $(($n + ${arr[i]}))
```
### Correct code:
```sh
echo $((n+1))
echo $((n + arr[i]))
```
### Rationale:
The `$` on regular variables in arithmetic contexts is unnecessary, and can even lead to subtle bugs. This is because the contents of `$((..))` is first expanded into a string, and then evaluated as an expression:
The `$` or `${..}` on regular variables in arithmetic contexts is unnecessary, and can even lead to subtle bugs. This is because the contents of `$((..))` is first expanded into a string, and then evaluated as an expression:
```sh
$ a='1+1'