Add solution for Challenge 2 by eksly #622
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WalkthroughAdds a new Go file implementing a simple CLI utility that reads a string from standard input, reverses it using rune-wise iteration, and prints the result. Includes an exported Changes
Estimated code review effort🎯 1 (Trivial) | ⏱️ ~3 minutes Possibly related PRs
Pre-merge checks❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
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Actionable comments posted: 1
🧹 Nitpick comments (1)
challenge-2/submissions/eksly/solution-template.go (1)
24-33: Consider pre-allocating the result slice for better performance.The current implementation appends to the slice in a loop, which may cause multiple allocations as the slice grows. Since you know the final size upfront, pre-allocating the slice and assigning directly would be more efficient.
Here's an optimized version:
// ReverseString returns the reversed string of s. func ReverseString(s string) string { - var res []rune runes := []rune(s) + res := make([]rune, len(runes)) for i := len(runes) -1; i >= 0; i-- { - res = append(res, runes[i]) + res[len(runes)-1-i] = runes[i] } return string(res) }
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📒 Files selected for processing (1)
challenge-2/submissions/eksly/solution-template.go(1 hunks)
🔇 Additional comments (1)
challenge-2/submissions/eksly/solution-template.go (1)
1-7: LGTM!Package declaration and imports are correct. All standard library imports are necessary for the functionality.
| 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) | ||
| } | ||
| } |
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Add error handling for scanner.
After scanning input, you should check for errors using scanner.Err(). Currently, if an I/O error occurs during scanning, it will be silently ignored.
Consider this improvement:
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/eksly/solution-template.go around lines 9 to 21, the
code ignores potential scanning errors — after using scanner.Scan() you must
call scanner.Err() to detect I/O errors; modify the main function to check
scanner.Err() after scanning and handle any non-nil error (e.g., print an error
to stderr and os.Exit(1) or return) so I/O failures are not silently ignored.
2 participants
Challenge 2 Solution
Submitted by: @eksly
Challenge: Challenge 2
Description
This PR contains my solution for Challenge 2.
Changes
challenge-2/submissions/eksly/solution-template.goTesting
Thank you for reviewing my submission! 🚀