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[RFC] Add idea of <bound> <sign> <var> <sign> <bound>.

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Alessandro Coglio 2021-07-21 00:02:04 -07:00
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docs/rfc/005-countdown-loops.md
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@ -245,3 +245,18 @@ But the awkwardness with larger steps than 1 remains:
for i in 0..10 down step 2 ... // i = 8 6 4 2 0 -- starts at 10-2 = 8
for i in 0..10 down step 3 ... // i = 9 6 3 0 -- starts at 10-1 = 9
```
## Variable in the Middle of Range with Equalities or Inequalities
Another approach is to put the variable in the middle of the range,
along with equality or inequality signs around the variable, e.g.
```ts
for 0 <= i < 5 // 0 1 2 3 4
for 0 <= i <= 5 // 0 1 2 3 4 5
for 5 > i >= 0 // 4 3 2 1 0
```
This maximizes explicitness, but it may need tweaking to avoid parsing ambiguities or difficulties
(recall that the bounds may be complex `const` expressions).
This could be a future addition to consider, but it seems that it would not replace the current Rust-like syntax.