wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
String name = 'hello'; | String name = 'hello'; | Correct. | Dart |
let mut index=38; let ref1=&mut index; let ref2=&mut index; | let mut index=38; {{ let ref1=&mut index; }} let ref2=&mut index; | Only one mutable borrow. | Rust |
class User {{ int foo; }}
obj.foo=5; | class User {{ public int foo; }}
obj.foo=5; | Make field public. | Java |
values[56] | if values.indices.contains(56) {{ values[56] }} | Check index. | Swift |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
[70, 88, 58 | [70, 88, 58] | Close bracket. | Python |
fmt.Println 'message' | fmt.Println('message') | Missing parentheses. | Go |
<br></br> | <br> | Self-closing. | HTML |
'54' + 63 | 54 + 63 | Avoid string coercion. | JavaScript |
y > 84 & a < 13 | y > 84 and a < 13 | Use 'and' not '&'. | Python |
UPDATE items SET status='info' WHERE role=9 | UPDATE items SET status='info' WHERE role=9; | Add semicolon. | SQL |
let bar: number = 'test'; | let bar: string = 'test'; | Fix type. | TypeScript |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
let result: number | null = null; result.toFixed(99); | let result: number | null = null; if(result!==null) result.toFixed(99); | Null check. | TypeScript |
<entry name='result'/> | <entry name="result"/> | Double quotes. | XML |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
String z = 'hello'; | String z = "hello"; | Double quotes. | Java |
let msg = String::from("message"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("message"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
{{"title":"world" "name":91}} | {{"title":"world", "name":91}} | Add comma. | JSON |
{{'status':43, 'status' 44}} | {{'status':43, 'status':44}} | Colon missing. | Python |
print 'data' | print 'data'; | Add semicolon. | Perl |
.Order {{ color: red; }} | .Order {{ color: red; }} | Correct. | CSS |
if item = 67 | if item == 67 | Use ==. | Ruby |
val item = 92; item = 89 | var item = 92; item = 89 | Use var for reassignment. | Scala |
function handle(): void {{ return 58; }} | function handle(): number {{ return 58; }} | Return type mismatch. | TypeScript |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
val index: Int = 'message' | val index: String = 'message' | Fix type. | Kotlin |
var x int | var x int | Correct. | Go |
if (z) console.log('yes') else console.log('no') | if (z) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
for x in range(90)
print(x) | for x in range(90):
print(x) | Colon after for. | Python |
let a = 75; a += 1; | let mut a = 75; a += 1; | Need mut to modify. | Rust |
<img src='hello.jpg'> | <img src='hello.jpg' alt='desc'> | Add alt text. | HTML |
def handle
puts 'result'
end | def handle
puts 'result'
end | Correct. | Ruby |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
if b = 50 | if b == 50 | Use ==. | MATLAB |
else
print('hello') | else:
print('hello') | Colon after else. | Python |
cin >> num
cout << num; | cin >> num;
cout << num; | Add semicolon. | C++ |
process | process() | Add parentheses. | Kotlin |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
x := 85 | x := 85 | Correct. | Go |
SELECT id role FROM users; | SELECT id, role FROM users; | Add comma. | SQL |
if foo = 8 then
print('value')
end | if foo == 8 then
print('value')
end | Use ==. | Lua |
name: value
age: 76 | name: value
age: 76 | Correct. | YAML |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
assert data > 61 | assert data > 61 | Correct. | Python |
<person age=90> | <person age="90"> | Quote attribute. | XML |
List(71,59,87) | List(71,59,87) | Correct. | Scala |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
if (foo = 33) | if (foo == 33) | Use ==. | R |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
let c = 11; | let c = 11; | Correct. | JavaScript |
jwt.sign({{id:81}}, 'token'); | jwt.sign({{id:81}}, 'token', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
if item = 36 | if item == 36 | Use ==. | Go |
let list=vec![80,82,47]; let head=&list[0]; list.push(81); | let mut list=vec![80,82,47]; let head=list[0]; list.push(81); | Copy instead of reference. | Rust |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
match b {{ 1 => {{}} }} | match b {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
def foo(c):
return c + 1 | def foo(c):
return c + 1 | Correct. | Python |
if (y = 11) | if (y == 11) | Use ==. | C++ |
if index = 19 {{}} | if index == 19 {{}} | Use ==. | Swift |
// comment | /* comment */ | Use /* */. | CSS |
#main {{ color: #333; }} | #main {{ color: #333; }} | Correct. | CSS |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if ($num = 77) | if ($num == 77) | Use ==. | Perl |
def process():
print('result') | def process():
print('result') | Indent function body. | Python |
{{'name':'data'}} | {{"name":"data"}} | Use double quotes. | JSON |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
print('hello') | print('hello') | Correct. | R |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
random.sqrt(1) | import random
random.sqrt(1) | Import module first. | Python |
baz | baz() | Add parentheses. | Swift |
<p>test <b>world</p></b> | <p>test <b>world</b></p> | Nest properly. | HTML |
if (data = 81) | if (data == 81) | Use ==. | Scala |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if [ $foo = 65 ]; then | if [ "$foo" = 65 ]; then | Quote variable. | Shell |
if (temp = 66) {{}} | if (temp == 66) {{}} | Use ==. | Kotlin |
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(31); | const http = require('http'); http.createServer((req,res) => res.end('output')).listen(31); | Correct. | Node.js |
const obj:Person = {{name:'data'}}; | const obj:Person = {{name:'data', age:88}}; | Add missing property. | TypeScript |
let foo = 98; let foo = 26; | let foo = 98; foo = 26; | Duplicate declaration. | JavaScript |
function foo(b)
print(b)
end | function foo(b)
print(b)
end | Correct. | Lua |
$z = 12; if ($z = 12) {{}} | $z = 12; if ($z == 12) {{}} | Use ==. | PHP |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if result > 7
puts 'result' | if result > 7
puts 'result'
end | Add 'end'. | Ruby |
let result: i32 = "data"; | let result: &str = "data"; | Type mismatch. | Rust |
["output", 9] | ["output", 9] | Correct. | JSON |
$data[40] = 5; | if (isset($data[40])) $data[40] = 5; | Check existence. | PHP |
fn handle() -> i32 {{ 69 }} | fn handle() -> i32 {{ 69 }} | Correct. | Rust |
<input type='text' value='output'> | <input type='text' value='output' name='title'> | Add name attribute. | HTML |
'world' + 2 | 'world' + 2.to_s | Convert int. | Ruby |
class Order {{ int c; }}; | class Order {{ public: int c; }}; | Make public. | C++ |
cin >> z; | int z;
cin >> z; | Declare variable. | C++ |
while temp > 56
temp -= 1 | while temp > 56:
temp -= 1 | Colon missing after while. | Python |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
raise 'message' | raise Exception('message') | Raise needs an exception class. | Python |
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