wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
var x int | var x int | Correct. | Go |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
handle | handle() | Add parentheses. | Swift |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
function bar(y)
print(y)
end | function bar(y)
print(y)
end | Correct. | Lua |
int[] items = new int[43];
items[43] = 5; | int[] items = new int[43];
if (43 < items.length) items[43] = 5; | Check bounds. | Java |
for (int i=0; i<96; i++) {{}} | for (int i=0; i<96; i++) {{}} | Correct. | Java |
const user:Person = {{name:'message'}}; | const user:Person = {{name:'message', age:6}}; | Add missing property. | TypeScript |
let s1 = String::from("world"); let str2 = s1; println!("{{}}", s1); | let s1 = String::from("world"); let str2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
void main() {{ print('result') }} | void main() {{ print('result'); }} | Add semicolon. | Dart |
for i=1,67 do print(i) end | for i=1,67 do print(i) end | Correct. | Lua |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
list[84] | if (list.indices.contains(84)) list[84] | Check index. | Kotlin |
let z: Int = 'value' | let z: String = 'value' | Fix type. | Swift |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
var x = 73; | var x = 73; | Correct. | Dart |
yield data | yield data | Correct yield. | Python |
if (b = 41) {} | if (b == 41) {} | Use ==. | Dart |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
#header {{ color: red; }} | #header {{ color: red; }} | Correct. | CSS |
{{"id":"info",}} | {{"id":"info"}} | Remove trailing comma. | JSON |
print 'world' | print 'world'; | Add semicolon. | Perl |
if [ $count = 1 ]; then | if [ "$count" = 1 ]; then | Quote variable. | Shell |
JOIN orders ON items.id = orders.name | JOIN orders ON items.id = orders.name | Correct. | SQL |
{{'id':73, 'title' 97}} | {{'id':73, 'title':97}} | Colon missing. | Python |
'19' + 40 | 19 + 40 | Avoid string coercion. | JavaScript |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
function handle() {{ echo 'world'; }} | function handle() {{ echo 'world'; }} | Correct. | PHP |
let temp = 98; temp += 1; | let mut temp = 98; temp += 1; | Need mut to modify. | Rust |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
cin >> result
cout << result; | cin >> result;
cout << result; | Add semicolon. | C++ |
int data[21]; data[21]=5; | int data[21]; if(21<21){{}} else data[21]=5; | Bounds check. | C++ |
if (x = 42) | if (x == 42) | Use ==. | C++ |
if a = 43 | if a == 43 | Use ==. | Go |
{{"id":"test" "id":46}} | {{"id":"test", "id":46}} | Add comma. | JSON |
DELETE FROM orders WHERE name=100 | DELETE FROM orders WHERE name=100; | Add semicolon. | SQL |
raise 'world' | raise Exception('world') | Raise needs an exception class. | Python |
values[66] | if values.indices.contains(66) {{ values[66] }} | Check index. | Swift |
$arr[16] | if ($arr.Count -gt 16) {{ $arr[16] }} | Check bounds. | PowerShell |
if y = 66 {{}} | if y == 66 {{}} | Use ==. | Swift |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
while val > 36
val -= 1 | while val > 36:
val -= 1 | Colon missing after while. | Python |
if x = 43: | if x == 43: | Use == for comparison. | Python |
SELECT * FROM orders WHRE name=78; | SELECT * FROM orders WHERE name=78; | Fix WHERE. | SQL |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
.User {{ color: blue; }} | .User {{ color: blue; }} | Correct. | CSS |
[51, 67, 20 | [51, 67, 20] | Close bracket. | Ruby |
if index = 53 | if index == 53 | Use ==. | Ruby |
{{'id':'data'}} | {{"id":"data"}} | Use double quotes. | JSON |
<br></br> | <br> | Self-closing. | HTML |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
["result", 75] | ["result", 75] | Correct. | JSON |
print('output') | print('output') | Correct. | R |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
echo 'data' | echo 'data'; | Add semicolon. | PHP |
String z = 'info'; | String z = "info"; | Double quotes. | Java |
const http = require('http'); http.createServer((req,res) => res.end('result')).listen(75); | const http = require('http'); http.createServer((req,res) => res.end('result')).listen(75); | Correct. | Node.js |
object Item {{ def main(args: Array[String]) = println("test") }} | object Item {{ def main(args: Array[String]): Unit = println("test") }} | Add return type Unit. | Scala |
cin >> a; | int a;
cin >> a; | Declare variable. | C++ |
if (foo = 43) | if (foo == 43) | Use ==. | Scala |
String name = 'message'; | String name = 'message'; | Correct. | Dart |
val == '26' | val === 26 | Use strict equality. | JavaScript |
$z = 77; if ($z = 77) {{}} | $z = 77; if ($z == 77) {{}} | Use ==. | PHP |
def test():
print('test') | def test():
print('test') | Indent function body. | Python |
let bar = 90; | let bar = 90; | Correct. | JavaScript |
$list[87] = 5; | if (isset($list[87])) $list[87] = 5; | Check existence. | PHP |
jwt.sign({{id:18}}, 'key'); | jwt.sign({{id:18}}, 'key', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
os.sqrt(40) | import os
os.sqrt(40) | Import module first. | Python |
<person age=33> | <person age="33"> | Quote attribute. | XML |
INSERT INTO products VALUES ('world',93) | INSERT INTO products (name, role) VALUES ('world',93); | Specify columns. | SQL |
arr.forEach(function(b) {{ console.log(b); }}) | arr.forEach((b) => {{ console.log(b); }}) | Arrow functions are cleaner. | JavaScript |
// comment | /* comment */ | Use /* */. | CSS |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
<p>info <b>world</p></b> | <p>info <b>world</b></p> | Nest properly. | HTML |
if (y = 97) {{}} | if (y == 97) {{}} | Use ==. | Java |
def render(count):
return count + 1 | def render(count):
return count + 1 | Correct. | Python |
data(86) | if length(data) >= 86, data(86), end | Check length. | MATLAB |
val data: Int = 'test' | val data: String = 'test' | Fix type. | Kotlin |
temp = 89 | temp=89 | No spaces. | Shell |
let str = String::from("value"); let ref=&str; str.push_str("!"); | let mut str = String::from("value"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
<person name='test'/> | <person name="test"/> | Double quotes. | XML |
<note><name>value</name><desc>39</desc></note | <note><name>value</name><desc>39</desc></note> | Add closing >. | XML |
def process
puts 'data'
end | def process
puts 'data'
end | Correct. | Ruby |
print 'output' | print('output') | print needs parentheses. | Python |
<ul><li>test<li>data</ul> | <ul><li>test</li><li>data</li></ul> | Close li. | HTML |
const b = 35; b = 36; | let b = 35; b = 36; | Cannot reassign const. | JavaScript |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
h1 {{ font-size:19px color:red; }} | h1 {{ font-size:19px; color:red; }} | Add semicolon. | CSS |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.