Add solution for Challenge 2 by DaniilYuz #843
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WalkthroughIntroduces a new Go solution file in Changes
Estimated code review effort🎯 1 (Trivial) | ⏱️ ~5 minutes Possibly related PRs
Pre-merge checks❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
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| 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.
The code doesn't check scanner.Err() after scanning. If an I/O error occurs while reading from stdin, it will be silently ignored, which could lead to unexpected behavior or silent failures.
Apply this diff to add proper 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/DaniilYuz/solution-template.go around lines 9 to 21,
the scanner error is not checked after scanning which can silently ignore I/O
problems; after the Scan() block call scanner.Err(), and if it returns a non-nil
error write a descriptive message to stderr (using fmt.Fprintln(os.Stderr, ...))
and exit with a non-zero status (os.Exit(1)) or return, otherwise continue to
call ReverseString and print the output; ensure the error check runs after the
Scan() completes so genuine read errors are handled.
| func ReverseString(s string) string { | ||
| res := []byte(s) | ||
| for i, j := 0, len(res)-1; i < j; i, j = i+1, j-1 { | ||
| res[i], res[j] = res[j], res[i] | ||
| } | ||
| return string(res) | ||
| } |
There was a problem hiding this comment.
Fix Unicode handling in ReverseString.
The function uses []byte(s) which reverses individual bytes. This breaks multi-byte UTF-8 characters like emojis, Chinese/Arabic/Cyrillic text, etc. For example, reversing "Hello 世界" would corrupt the Chinese characters since each character spans multiple bytes.
Apply this diff to handle Unicode correctly:
// ReverseString returns the reversed string of s.
func ReverseString(s string) string {
- res := []byte(s)
+ res := []rune(s)
for i, j := 0, len(res)-1; i < j; i, j = i+1, j-1 {
res[i], res[j] = res[j], res[i]
}
return string(res)
}🤖 Prompt for AI Agents
In challenge-2/submissions/DaniilYuz/solution-template.go around lines 24 to 30,
the function reverses bytes using []byte(s) which corrupts multi-byte UTF-8
characters; convert the string to a []rune, reverse the rune slice in-place
(swap runes from ends moving inward), and return string(runes) so Unicode
characters are preserved while keeping the same function signature and behavior.
2 participants
Challenge 2 Solution
Submitted by: @DaniilYuz
Challenge: Challenge 2
Description
This PR contains my solution for Challenge 2.
Changes
challenge-2/submissions/DaniilYuz/solution-template.goTesting
Thank you for reviewing my submission! 🚀