Add solution for Challenge 19 by azs0309

[azs0309]

Challenge 19 Solution

Submitted by: @azs0309
Challenge: Challenge 19

Description

This PR contains my solution for Challenge 19.

Changes

• Added solution file to challenge-19/submissions/azs0309/solution-template.go

Testing

• Solution passes all test cases
• Code follows Go best practices

Thank you for reviewing my submission! 🚀

[coderabbitai]

Walkthrough

Adds a new Go file containing four exported slice utility functions (FindMax, RemoveDuplicates, ReverseSlice, FilterEven) and a main function demonstrating their usage with sample data. Functions handle empty inputs gracefully.

Changes

Cohort / File(s)	Summary
Challenge 19 solution challenge-19/submissions/azs0309/solution-template.go	New file introducing four exported utility functions for slice operations: FindMax (returns maximum or 0), RemoveDuplicates (preserves order), ReverseSlice (returns reversed slice), and FilterEven (filters even numbers). Includes main function demonstrating all utilities.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Verify correctness of slice logic in each utility function
• Confirm edge case handling for empty inputs
• Check that order preservation in RemoveDuplicates is implemented correctly

Possibly related PRs

• Add solution for Challenge 19 by wgasparin #816: Adds identical solution-template.go with the same four exported utility functions for Challenge 19.
• Add solution for Challenge 19 by Johrespi #724: Implements the same four slice utility functions and demo main in a separate Challenge 19 submission file.
• Add solution for Challenge 19 by kiramux #722: Adds nearly identical challenge-19 solution file with the same four exported functions and demonstration.

Pre-merge checks

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Add solution for Challenge 19 by azs0309' clearly describes the main change: adding a solution file for Challenge 19.
Description check	✅ Passed	The description is directly related to the changeset, explaining that it contains a solution for Challenge 19 with appropriate details about the file added.
Docstring Coverage	✅ Passed	Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%.

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 1

🧹 Nitpick comments (1)

challenge-19/submissions/azs0309/solution-template.go (1)

44-65: Consider using a map for better performance.

The current implementation uses nested loops resulting in O(n²) time complexity. For larger slices, this could impact performance. A map-based approach would reduce this to O(n).

🔎 Proposed refactor using a map

 func RemoveDuplicates(numbers []int) []int {
 	if len(numbers) == 0{
 	 return []int{}
 	}
-	result := make([]int,0,len(numbers))
-
-	result = append(result, numbers[0])
+	seen := make(map[int]bool)
+	result := make([]int, 0, len(numbers))
+
 	for _, number := range numbers {
-	    found := false
-	    for _, inresult := range result {
-	        if number == inresult {
-	            found = true
-	            }
-	        }
-	   if !found {
+	    if !seen[number] {
+	        seen[number] = true
 	       result = append(result, number)
 	   }
 	}
 	return result
 }

📜 Review details

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 669bf54 and 883aee8.

📒 Files selected for processing (1)

• challenge-19/submissions/azs0309/solution-template.go (1 hunks)

🔇 Additional comments (4)

challenge-19/submissions/azs0309/solution-template.go (4)

7-26: LGTM! Clear demonstration code.

The main function effectively demonstrates all utility functions with appropriate test data and output.

---

28-42: LGTM! Efficient maximum-finding implementation.

The function correctly finds the maximum value with O(n) time complexity and handles empty slices as documented.

---

75-79: LGTM! Correct reverse implementation.

The reverse logic correctly iterates backwards and builds the reversed slice efficiently.

---

82-95: LGTM! Correct even number filtering.

The function correctly filters even numbers using the modulo operator and handles empty input appropriately.

[coderabbitai]

🛠️ Refactor suggestion | 🟠 Major

Remove commented-out code.

The commented lines are unnecessary dead code and should be removed to keep the codebase clean.

🔎 Proposed fix

     if len(slice) == 0{
 	 return []int{}
 	}
-// 	if len(slice) == 1{
-// 	 return slice
-// 	}
 	reversed := make([]int,0,len(slice))

📝 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.

Suggested change

	// if len(slice) == 1{
	// return slice
	// }
	if len(slice) == 0{
	return []int{}
	}
	reversed := make([]int,0,len(slice))

🤖 Prompt for AI Agents

In challenge-19/submissions/azs0309/solution-template.go around lines 72 to 74,
there are three commented-out lines (an if len(slice) == 1 check and return)
that are dead code; remove these commented lines entirely to clean up the file
and keep the codebase tidy, leaving no leftover commented logic.