Add solution for Challenge 2 by elecycele #794
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WalkthroughAdds a Go solution for Challenge 2 with a Changes
Sequence DiagramsequenceDiagram
participant main
participant ReverseString
participant stdout
main->>main: ReadLine from stdin
main->>ReverseString: Call ReverseString(line)
ReverseString->>ReverseString: Convert string to runes
ReverseString->>ReverseString: Swap runes in-place (i ↔ j)
ReverseString-->>main: Return reversed string
main->>stdout: Print result
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes
Possibly related PRs
Pre-merge checks❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
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Actionable comments posted: 3
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro
📒 Files selected for processing (1)
challenge-2/submissions/elecycele/solution-template.go(1 hunks)
🔇 Additional comments (1)
challenge-2/submissions/elecycele/solution-template.go (1)
1-7: LGTM!Package declaration and imports are appropriate for the task.
| func main() { | ||
| // Read input from standard input | ||
| scanner := bufio.NewScanner(os.Stdin) | ||
| if scanner.Scan() { | ||
| input := scanner.Text() | ||
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| // Call the ReverseString function | ||
| output := ReverseString(input) | ||
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| // Print the result | ||
| fmt.Println(output) | ||
| } | ||
| } |
There was a problem hiding this comment.
Consider adding error handling for scanner.
The code doesn't check for scanner errors after Scan() returns. While this works for valid input, it silently ignores any I/O errors.
Apply this diff to add error handling:
func main() {
// Read input from standard input
scanner := bufio.NewScanner(os.Stdin)
if scanner.Scan() {
input := scanner.Text()
// Call the ReverseString function
output := ReverseString(input)
// Print the result
fmt.Println(output)
}
+ if err := scanner.Err(); err != nil {
+ fmt.Fprintf(os.Stderr, "Error reading input: %v\n", err)
+ os.Exit(1)
+ }
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| func main() { | |
| // Read input from standard input | |
| scanner := bufio.NewScanner(os.Stdin) | |
| if scanner.Scan() { | |
| input := scanner.Text() | |
| // Call the ReverseString function | |
| output := ReverseString(input) | |
| // Print the result | |
| fmt.Println(output) | |
| } | |
| } | |
| func main() { | |
| // Read input from standard input | |
| scanner := bufio.NewScanner(os.Stdin) | |
| if scanner.Scan() { | |
| input := scanner.Text() | |
| // Call the ReverseString function | |
| output := ReverseString(input) | |
| // Print the result | |
| fmt.Println(output) | |
| } | |
| if err := scanner.Err(); err != nil { | |
| fmt.Fprintf(os.Stderr, "Error reading input: %v\n", err) | |
| os.Exit(1) | |
| } | |
| } |
🤖 Prompt for AI Agents
In challenge-2/submissions/elecycele/solution-template.go around lines 9 to 21,
the main function calls scanner.Scan() but does not check scanner.Err()
afterwards so I/O errors are silently ignored; after Scan() returns (and
before/after using input) call scanner.Err(), and if non-nil log or print the
error to stderr (e.g., fmt.Fprintln(os.Stderr,...)) and exit with a non-zero
status (os.Exit(1)) so the program fails fast on I/O errors instead of silently
continuing.
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| // ReverseString returns the reversed string of s. | ||
| func ReverseString(s string) string { | ||
| // TODO: Implement the function |
There was a problem hiding this comment.
Remove the TODO comment.
The function is fully implemented, so the TODO comment should be removed.
Apply this diff:
- // TODO: Implement the function
runes := []rune(s)📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| // TODO: Implement the function | |
| runes := []rune(s) |
🤖 Prompt for AI Agents
In challenge-2/submissions/elecycele/solution-template.go around line 25, remove
the remaining "// TODO: Implement the function" comment because the function is
already implemented; simply delete that single-line TODO comment so the code no
longer contains stale task markers.
| // TODO: Implement the function | ||
| runes := []rune(s) | ||
| i := 0 | ||
| j := len(s) -1 |
There was a problem hiding this comment.
Critical bug: Use len(runes) instead of len(s).
Line 28 uses len(s) which returns the byte length of the string, not the rune count. For multi-byte UTF-8 characters, this will cause an index out of bounds panic.
Example: The string "你好" has 6 bytes but only 2 runes. Using j := len(s) - 1 sets j = 5, but runes only has indices 0-1, causing a panic when accessing runes[5].
Apply this diff to fix the bug:
- j := len(s) -1
+ j := len(runes) - 1📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| j := len(s) -1 | |
| j := len(runes) - 1 |
🤖 Prompt for AI Agents
In challenge-2/submissions/elecycele/solution-template.go around line 28, the
code sets j := len(s) - 1 which uses byte length of the string and can panic for
multi-byte UTF-8 characters; change j to use the rune slice length (j :=
len(runes) - 1) so indexing matches the runes slice, ensuring all subsequent
accesses use rune indices rather than byte indices.
2 participants
Challenge 2 Solution
Submitted by: @elecycele
Challenge: Challenge 2
Description
This PR contains my solution for Challenge 2.
Changes
challenge-2/submissions/elecycele/solution-template.goTesting
Thank you for reviewing my submission! 🚀