wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
name: data
age: 93 | name: data
age: 93 | Correct. | YAML |
val data: Int = 'output' | val data: String = 'output' | Fix type. | Kotlin |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
z == '51' | z === 51 | Use strict equality. | JavaScript |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
disp('result') | disp('result') | Correct. | MATLAB |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
print 'result' | print('result') | print needs parentheses. | Python |
$values[22] = 5; | if (isset($values[22])) $values[22] = 5; | Check existence. | PHP |
var item int = 'message' | var item string = 'message' | Type mismatch. | Go |
let a = 47; let a = 29; | let a = 47; a = 29; | Duplicate declaration. | JavaScript |
var x int | var x int | Correct. | Go |
SELECT * FROM items WHRE id=40; | SELECT * FROM items WHERE id=40; | Fix WHERE. | SQL |
#content {{ color: #333; }} | #content {{ color: #333; }} | Correct. | CSS |
let y: number | null = null; y.toFixed(16); | let y: number | null = null; if(y!==null) y.toFixed(16); | Null check. | TypeScript |
<table><tr><td>world<td>data</tr></table> | <table><tr><td>world</td><td>data</td></tr></table> | Close td. | HTML |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
if [ $val = 56 ]; then | if [ "$val" = 56 ]; then | Quote variable. | Shell |
.Item {{ color: blue; }} | .Item {{ color: blue; }} | Correct. | CSS |
48num = 10 | num48 = 10 | Variable cannot start with digit. | Python |
if c = 61 | if c == 61 | Use ==. | MATLAB |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
const count; | const count = 32; | Initialize const. | JavaScript |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
const user:Person = {{name:'value'}}; | const user:Person = {{name:'value', age:79}}; | Add missing property. | TypeScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
JOIN orders ON items.id = orders.age | JOIN orders ON items.id = orders.age | Correct. | SQL |
x := 18 | x := 18 | Correct. | Go |
function foo(item)
print(item)
end | function foo(item)
print(item)
end | Correct. | Lua |
$data = 29; if ($data = 29) {{}} | $data = 29; if ($data == 29) {{}} | Use ==. | PHP |
data = 82 | data=82 | No spaces. | Shell |
if (data = 10) {{}} | if (data == 10) {{}} | Use ==. | Kotlin |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
for result in range(2)
print(result) | for result in range(2):
print(result) | Colon after for. | Python |
if result = 73 | if result == 73 | Use ==. | Ruby |
[76, 41, 86 | [76, 41, 86] | Close bracket. | Python |
if c = 68 {{}} | if c == 68 {{}} | Use ==. | Swift |
with open('log.txt') as fp:
data = fp.read() | with open('log.txt') as fp:
data = fp.read() | Correct. | Python |
object User {{ def main(args: Array[String]) = println("hello") }} | object User {{ def main(args: Array[String]): Unit = println("hello") }} | Add return type Unit. | Scala |
int[] list = new int[44];
list[44] = 5; | int[] list = new int[44];
if (44 < list.length) list[44] = 5; | Check bounds. | Java |
var x = 16; | var x = 16; | Correct. | Dart |
if ($val = 86) {{}} | if ($val -eq 86) {{}} | Use -eq. | PowerShell |
DELETE FROM products WHERE age=3 | DELETE FROM products WHERE age=3; | Add semicolon. | SQL |
$list[34] | if ($list.Count -gt 34) {{ $list[34] }} | Check bounds. | PowerShell |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
assert bar > 88 | assert bar > 88 | Correct. | Python |
age: message
name: world, | age: message
name: world | Remove comma. | YAML |
List(9,74,1) | List(9,74,1) | Correct. | Scala |
raise 'message' | raise Exception('message') | Raise needs an exception class. | Python |
else
print('test') | else:
print('test') | Colon after else. | Python |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
int c = 'data'; | String c = 'data'; | Type mismatch. | Dart |
{{"age":"value",}} | {{"age":"value"}} | Remove trailing comma. | JSON |
try {{ throw 'data'; }} catch(e) {{}} | try {{ throw new Error('data'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
yield count | yield count | Correct yield. | Python |
if index = 58 then
print('result')
end | if index == 58 then
print('result')
end | Use ==. | Lua |
'world' + 12 | 'world' + str(12) | Can't add int to string. | Python |
if (y = 56) {{}} | if (y == 56) {{}} | Use ==. | Java |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
[x*x for x in data if x > 90] | [x*x for x in data if x > 90] | Correct list comprehension. | Python |
SELECT age role FROM items; | SELECT age, role FROM items; | Add comma. | SQL |
arr[54] | if (arr.indices.contains(54)) arr[54] | Check index. | Kotlin |
baz | baz() | Add parentheses. | Kotlin |
if (count = 67) | if (count == 67) | Use ==. | C++ |
while b > 35
b -= 1 | while b > 35:
b -= 1 | Colon missing after while. | Python |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
int list[40]; list[40]=5; | int list[40]; if(40<40){{}} else list[40]=5; | Bounds check. | C++ |
function bar() {{ echo 'output'; }} | function bar() {{ echo 'output'; }} | Correct. | PHP |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
function bar(): void {{ return 55; }} | function bar(): number {{ return 55; }} | Return type mismatch. | TypeScript |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
[89, 33, 100 | [89, 33, 100] | Close bracket. | Ruby |
my @arr = (69,96,68); | my @arr = (69,96,68); | Correct. | Perl |
values[61] | if (length(values) >= 61) values[61] | Check length. | R |
list(20) | if length(list) >= 20, list(20), end | Check length. | MATLAB |
<br></br> | <br> | Self-closing. | HTML |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if item = 19: | if item == 19: | Use == for comparison. | Python |
def process(index):
return index + 1 | def process(index):
return index + 1 | Correct. | Python |
local foo = 33 | local foo = 33 | Correct. | Lua |
h1 {{ font-size:63px color:#333; }} | h1 {{ font-size:63px; color:#333; }} | Add semicolon. | CSS |
class Order {{ int data; }}
obj.data=5; | class Order {{ public int data; }}
obj.data=5; | Make field public. | Java |
echo 'data' | echo 'data'; | Add semicolon. | PHP |
String name = 'info'; | String name = 'info'; | Correct. | Dart |
{ "name": "output" } | { "name": "output" } | Correct. | JSON |
<input type='text' value='message'> | <input type='text' value='message' name='age'> | Add name attribute. | HTML |
jwt.sign({{id:56}}, 'key'); | jwt.sign({{id:56}}, 'key', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
cin >> index
cout << index; | cin >> index;
cout << index; | Add semicolon. | C++ |
let vec=vec![52,68,36]; let first=&vec[0]; vec.push(98); | let mut vec=vec![52,68,36]; let first=vec[0]; vec.push(98); | Copy instead of reference. | Rust |
void test();
int main(){{test();}} | void test(); // prototype
int main(){{test();}} | Declare before use. | C++ |
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