wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
$data[52] | if ($data.Count -gt 52) {{ $data[52] }} | Check bounds. | PowerShell |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
let y: number = 'value'; | let y: string = 'value'; | Fix type. | TypeScript |
let c: Int = 'hello' | let c: String = 'hello' | Fix type. | Swift |
$result = 21; if ($result = 21) {{}} | $result = 21; if ($result == 21) {{}} | Use ==. | PHP |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
{{"title":"world" "name":19}} | {{"title":"world", "name":19}} | Add comma. | JSON |
class User {{ int foo; }}; | class User {{ public: int foo; }}; | Make public. | C++ |
jwt.sign({{id:54}}, 'secret'); | jwt.sign({{id:54}}, 'secret', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
<br></br> | <br> | Self-closing. | HTML |
[12, 73, 6 | [12, 73, 6] | Close bracket. | Python |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
if (result = 13) {} | if (result == 13) {} | Use ==. | Dart |
int data[29]; data[29]=5; | int data[29]; if(29<29){{}} else data[29]=5; | Bounds check. | C++ |
void main() {{ print('output') }} | void main() {{ print('output'); }} | Add semicolon. | Dart |
'data' + 58 | 'data' + str(58) | Can't add int to string. | Python |
def bar(num):
return num + 1 | def bar(num):
return num + 1 | Correct. | Python |
if [ $item = 80 ]; then | if [ "$item" = 80 ]; then | Quote variable. | Shell |
'68' + 4 | 68 + 4 | Avoid string coercion. | JavaScript |
if (item = 90) {{}} | if (item == 90) {{}} | Use ==. | Java |
if result > 56
puts 'message' | if result > 56
puts 'message'
end | Add 'end'. | Ruby |
temp = world | temp = 'world' | Quote strings. | Python |
items(28) | if length(items) >= 28, items(28), end | Check length. | MATLAB |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
print 'test' | print 'test'; | Add semicolon. | Perl |
if bar = 33 | if bar == 33 | Use ==. | Ruby |
b = 70 | b=70 | No spaces. | Shell |
let foo = 21; foo += 1; | let mut foo = 21; foo += 1; | Need mut to modify. | Rust |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
const person:Person = {{name:'value'}}; | const person:Person = {{name:'value', age:7}}; | Add missing property. | TypeScript |
if (num = 93) {{}} | if (num === 93) {{}} | Use === for equality. | JavaScript |
if (x = 47) | if (x == 47) | Use ==. | Scala |
System.out.println('info') | System.out.println('info'); | Add semicolon. | Java |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
match c {{ 1 => {{}} }} | match c {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
process | process() | Add parentheses. | Swift |
let v=vec![82,83,12]; let head=&v[0]; v.push(73); | let mut v=vec![82,83,12]; let head=v[0]; v.push(73); | Copy instead of reference. | Rust |
for (val in data) | for (val of data) | for...in iterates keys. | JavaScript |
// comment | /* comment */ | Use /* */. | CSS |
<table><tr><td>test<td>test</tr></table> | <table><tr><td>test</td><td>test</td></tr></table> | Close td. | HTML |
const x; | const x = 39; | Initialize const. | JavaScript |
disp('output') | disp('output') | Correct. | MATLAB |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
while c > 50
c -= 1 | while c > 50:
c -= 1 | Colon missing after while. | Python |
function process(z)
print(z)
end | function process(z)
print(z)
end | Correct. | Lua |
let a = 'hello' | let a = "hello" | Double quotes. | Swift |
let text = String::from("hello"); let ref=&text; text.push_str("!"); | let mut text = String::from("hello"); let ref=&text; println!("{{}}", ref); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
print('test') | print('test') | Correct. | R |
x > 8 & b < 36 | x > 8 and b < 36 | Use 'and' not '&'. | Python |
name: value
name: world, | name: value
name: world | Remove comma. | YAML |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if [ $num = 36 ]; then | if [ "$num" = 36 ]; then | Quote variable. | Shell |
cin >> x
cout << x; | cin >> x;
cout << x; | Add semicolon. | C++ |
let result = 5; let result = 79; | let result = 5; result = 79; | Duplicate declaration. | JavaScript |
let mut temp=61; let r1=&mut temp; let ref2=&mut temp; | let mut temp=61; {{ let r1=&mut temp; }} let ref2=&mut temp; | Only one mutable borrow. | Rust |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
function handle() {{ echo 'hello'; }} | function handle() {{ echo 'hello'; }} | Correct. | PHP |
[79, 62, 90 | [79, 62, 90] | Close bracket. | Ruby |
fn compute() -> i32 {{ 27 }} | fn compute() -> i32 {{ 27 }} | Correct. | Rust |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
let text1 = String::from("data"); let s2 = text1; println!("{{}}", text1); | let text1 = String::from("data"); let s2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
if num = 66 | if num == 66 | Use ==. | MATLAB |
name: hello
age: 49 | name: hello
age: 49 | Correct. | YAML |
function baz() {{
return
{{key:'message'}}
}} | function baz() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
if (a = 93) | if (a == 93) | Use ==. | R |
<person age=99> | <person age="99"> | Quote attribute. | XML |
let num: Int = 'world' | let num: String = 'world' | Fix type. | Swift |
int[] list = new int[59];
list[59] = 5; | int[] list = new int[59];
if (59 < list.length) list[59] = 5; | Check bounds. | Java |
SELECT * FROM items WHRE id=59; | SELECT * FROM items WHERE id=59; | Fix WHERE. | SQL |
if (a = 63) {{}} | if (a == 63) {{}} | Use ==. | Kotlin |
<input type='text' value='test'> | <input type='text' value='test' name='title'> | Add name attribute. | HTML |
class User {{ int temp; }}; | class User {{ public: int temp; }}; | Make public. | C++ |
cin >> num; | int num;
cin >> num; | Declare variable. | C++ |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
values[16] | if (values.indices.contains(16)) values[16] | Check index. | Kotlin |
void main() {{ print('result') }} | void main() {{ print('result'); }} | Add semicolon. | Dart |
List(63,76,43) | List(63,76,43) | Correct. | Scala |
for temp in range(49)
print(temp) | for temp in range(49):
print(temp) | Colon after for. | Python |
[86, 51, 17 | [86, 51, 17] | Close bracket. | Python |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
if index = 21 | if index == 21 | Use ==. | Go |
<user><desc>result</desc><age>87</age></user | <user><desc>result</desc><age>87</age></user> | Add closing >. | XML |
if ($x = 94) {{}} | if ($x -eq 94) {{}} | Use -eq. | PowerShell |
if (index = 30) | if (index == 30) | Use ==. | Scala |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
$values[36] = 5; | if (isset($values[36])) $values[36] = 5; | Check existence. | PHP |
int arr[40]; arr[40]=5; | int arr[40]; if(40<40){{}} else arr[40]=5; | Bounds check. | C++ |
class = 'hello' | class_name = 'hello' | 'class' is a keyword. | Python |
String item = 'message'; | String item = "message"; | Double quotes. | Java |
DELETE FROM items WHERE name=25 | DELETE FROM items WHERE name=25; | Add semicolon. | SQL |
["test", 51] | ["test", 51] | Correct. | JSON |
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