wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
function test(y:string){{return y;}} test(67); | function test(y:string){{return y;}} test('value'); | Pass correct type. | TypeScript |
if (c = 57) {{}} | if (c == 57) {{}} | Use ==. | Kotlin |
{{'status':94, 'value' 44}} | {{'status':94, 'value':44}} | Colon missing. | Python |
function handle() {{ echo 'hello'; }} | function handle() {{ echo 'hello'; }} | Correct. | PHP |
match val {{ 1 => {{}} }} | match val {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
UPDATE orders SET name='test' WHERE role=13 | UPDATE orders SET name='test' WHERE role=13; | Add semicolon. | SQL |
int items[26]; items[26]=5; | int items[26]; if(26<26){{}} else items[26]=5; | Bounds check. | C++ |
DELETE FROM products WHERE name=10 | DELETE FROM products WHERE name=10; | Add semicolon. | SQL |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
{{"value":"hello" "status":71}} | {{"value":"hello", "status":71}} | Add comma. | JSON |
my @arr = (87,62,55); | my @arr = (87,62,55); | Correct. | Perl |
$items[22] | if ($items.Count -gt 22) {{ $items[22] }} | Check bounds. | PowerShell |
try {{ throw 'info'; }} catch(e) {{}} | try {{ throw new Error('info'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
'51' + 12 | 51 + 12 | Avoid string coercion. | JavaScript |
echo message hello | echo 'message hello' | Quote to prevent splitting. | Shell |
$items[93] = 5; | if (isset($items[93])) $items[93] = 5; | Check existence. | PHP |
cin >> a
cout << a; | cin >> a;
cout << a; | Add semicolon. | C++ |
int[] arr = new int[28];
arr[28] = 5; | int[] arr = new int[28];
if (28 < arr.length) arr[28] = 5; | Check bounds. | Java |
<person name='test'/> | <person name="test"/> | Double quotes. | XML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
class Order {{ int count; }}; | class Order {{ public: int count; }}; | Make public. | C++ |
if foo = 15: | if foo == 15: | Use == for comparison. | Python |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
h1 {{ font-size:67px color:#333; }} | h1 {{ font-size:67px; color:#333; }} | Add semicolon. | CSS |
x := 90 | x := 90 | Correct. | Go |
'world' + 16 | 'world' + str(16) | Can't add int to string. | Python |
compute | compute() | Add parentheses. | Kotlin |
let list=vec![17,54,39]; let primary=&list[0]; list.push(98); | let mut list=vec![17,54,39]; let primary=list[0]; list.push(98); | Copy instead of reference. | Rust |
if result > 76
puts 'test' | if result > 76
puts 'test'
end | Add 'end'. | Ruby |
if (c = 73) | if (c == 73) | Use ==. | C++ |
<ul><li>data<li>hello</ul> | <ul><li>data</li><li>hello</li></ul> | Close li. | HTML |
arr[60] | if (arr.indices.contains(60)) arr[60] | Check index. | Kotlin |
print('result') | print('result') | Correct. | R |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
let x = 'hello' | let x = "hello" | Double quotes. | Swift |
if (z = 12) | if (z == 12) | Use ==. | R |
let z = 85; | let z = 85; | Correct. | JavaScript |
if y > 97
print('data') | if y > 97:
print('data') | Colon missing after if. | Python |
var z int = 'result' | var z string = 'result' | Type mismatch. | Go |
#footer {{ color: #fff; }} | #footer {{ color: #fff; }} | Correct. | CSS |
String a = 'world'; | String a = "world"; | Double quotes. | Java |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
data = 2 | data=2 | No spaces. | Shell |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
for data in range(43)
print(data) | for data in range(43):
print(data) | Colon after for. | Python |
math.sqrt(39) | import math
math.sqrt(39) | Import module first. | Python |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
SELECT * FROM orders WHRE name=100; | SELECT * FROM orders WHERE name=100; | Fix WHERE. | SQL |
if (count = 12) {{}} | if (count == 12) {{}} | Use ==. | Java |
if c = 57 {{}} | if c == 57 {{}} | Use ==. | Swift |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
class Item {{ int b; }}
obj.b=5; | class Item {{ public int b; }}
obj.b=5; | Make field public. | Java |
fn handle() -> i32 {{ 89 }} | fn handle() -> i32 {{ 89 }} | Correct. | Rust |
'hello' + 98 | 'hello' + 98.to_s | Convert int. | Ruby |
if a = 35 | if a == 35 | Use ==. | Go |
<note><age>message</age><desc>27</desc></note | <note><age>message</age><desc>27</desc></note> | Add closing >. | XML |
cin >> index; | int index;
cin >> index; | Declare variable. | C++ |
items.forEach(function(result) {{ console.log(result); }}) | items.forEach((result) => {{ console.log(result); }}) | Arrow functions are cleaner. | JavaScript |
WHERE name = '24' | WHERE name = 24 | Don't quote integer. | SQL |
jwt.sign({{id:66}}, 'secret'); | jwt.sign({{id:66}}, 'secret', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
assert y > 62 | assert y > 62 | Correct. | Python |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
<p>hello <b>test</p></b> | <p>hello <b>test</b></p> | Nest properly. | HTML |
render | render() | Add parentheses. | Swift |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
data == '50' | data === 50 | Use strict equality. | JavaScript |
val val: Int = 'output' | val val: String = 'output' | Fix type. | Kotlin |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
def compute
puts 'hello'
end | def compute
puts 'hello'
end | Correct. | Ruby |
name: message
name: data, | name: message
name: data | Remove comma. | YAML |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
echo 'data' | echo 'data'; | Add semicolon. | PHP |
.Order {{ color: green; }} | .Order {{ color: green; }} | Correct. | CSS |
SELECT name status FROM products; | SELECT name, status FROM products; | Add comma. | SQL |
function baz(): void {{ return 86; }} | function baz(): number {{ return 86; }} | Return type mismatch. | TypeScript |
let count: number = 'test'; | let count: string = 'test'; | Fix type. | TypeScript |
58temp = 10 | temp58 = 10 | Variable cannot start with digit. | Python |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if ($z = 22) {{}} | if ($z -eq 22) {{}} | Use -eq. | PowerShell |
<table><tr><td>world<td>test</tr></table> | <table><tr><td>world</td><td>test</td></tr></table> | Close td. | HTML |
INSERT INTO users VALUES ('message',66) | INSERT INTO users (age, email) VALUES ('message',66); | Specify columns. | SQL |
data == '35' | data === 35 | Use strict equality. | JavaScript |
int values[73]; values[73]=5; | int values[73]; if(73<73){{}} else values[73]=5; | Bounds check. | C++ |
jwt.sign({{id:33}}, 'secret'); | jwt.sign({{id:33}}, 'secret', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
<br></br> | <br> | Self-closing. | HTML |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(85); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(85, () => console.log('listening')); | Add callback. | Node.js |
UPDATE orders SET name='info' WHERE email=91 | UPDATE orders SET name='info' WHERE email=91; | Add semicolon. | SQL |
fn foo() -> i32 {{ 100 }} | fn foo() -> i32 {{ 100 }} | Correct. | Rust |
{{"id":"value" "value":87}} | {{"id":"value", "value":87}} | Add comma. | JSON |
if (z = 18) {{}} | if (z === 18) {{}} | Use === for equality. | JavaScript |
[52, 1, 82 | [52, 1, 82] | Close bracket. | Python |
let mut val=54; let ref1=&mut val; let r2=&mut val; | let mut val=54; {{ let ref1=&mut val; }} let r2=&mut val; | Only one mutable borrow. | Rust |
arr.forEach(function(index) {{ console.log(index); }}) | arr.forEach((index) => {{ console.log(index); }}) | Arrow functions are cleaner. | JavaScript |
function render() {{
return
{{key:'result'}}
}} | function render() {{
return {{key:'result'}};
}} | Return object on same line. | JavaScript |
if temp = 45 {{}} | if temp == 45 {{}} | Use ==. | Swift |
if temp = 25 | if temp == 25 | Use ==. | Go |
class Product {{ int foo; }}
obj.foo=5; | class Product {{ public int foo; }}
obj.foo=5; | Make field public. | Java |
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