Challenge Solver: Debugging Tips

We provide several ways to help you write the best code you can.

Code Errors

Most compilation & runtime errors should show up automatically in the results pane.

Write your own test cases!

The Sample Tests editor is available for you to write your own test cases. These are your own cases, and usually you'll be provided with a few basic examples. Whatever changes you make to this code will be provided to the reviewer, so you can use this as an extra way to stand out, showing your ability to write quality, testable code.

You should modify the code in that view to adjust or add more test cases for debugging your code as you work. Think about additional common and edge cases you might want to add.

STDOUT / Console Output

While Qualified doesn't support interactive debugging, you can write to stdout (sometimes called "system out" or "console") in any language for outputting debugging information. When you run your code, this will show alongside the test output.

Note that output is collapsed by default for passing tests.

Examples:

• C

  #include <stdio.h>
  printf("debug message\n");

• Clojure

  (print "debug message")

• C++

  #include <iostream>
  std::cout << "debug message\n";

• C#

  System.Console.WriteLine("debug message");

• Dart

  print("debug message");

• Elixir

  IO.puts("debug message")

• Erlang

  io:fwrite("debug message\n"),

• F#

  printf("debug message")

• Go

  import "fmt"
  fmt.Println("debug message")

• Groovy

  print("debug message")

• Java

  System.out.println("debug message");

• JavaScript / TypeScript / CoffeeScript

  console.log("debug message");

• Kotlin

  println("debug message")

• Lua

  print("debug message")

• Objective C

  NSLog(@"debug message");

• OCaml

  print_endline "debug message";

• PHP

  echo "debug message\n";

• Python

  print("debug message")

• R

  print("debug message")

• Ruby

  p "debug message"

• Rust

  println!("debug message");

• Scala

  print("debug message")

• Shell

  echo "debug message"

• SQL

  SELECT 'debug message'

• Swift

  print("debug message")