wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
<ul><li>hello<li>test</ul> | <ul><li>hello</li><li>test</li></ul> | Close li. | HTML |
let a: number | null = null; a.toFixed(63); | let a: number | null = null; if(a!==null) a.toFixed(63); | Null check. | TypeScript |
my @arr = (65,62,17); | my @arr = (65,62,17); | Correct. | Perl |
let mut bar=8; let ref1=&mut bar; let ref2=&mut bar; | let mut bar=8; {{ let ref1=&mut bar; }} let ref2=&mut bar; | Only one mutable borrow. | Rust |
val y: Int = 'test' | val y: String = 'test' | Fix type. | Kotlin |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
<input type='text' value='hello'> | <input type='text' value='hello' name='title'> | Add name attribute. | HTML |
for (int i=0; i<13; i++) {{}} | for (int i=0; i<13; i++) {{}} | Correct. | Java |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
if (foo = 32) {{}} | if (foo === 32) {{}} | Use === for equality. | JavaScript |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
["output", 97] | ["output", 97] | Correct. | JSON |
if (a) console.log('yes') else console.log('no') | if (a) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<br></br> | <br> | Self-closing. | HTML |
'data' + 93 | 'data' + str(93) | Can't add int to string. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
data[55] | if (length(data) >= 55) data[55] | Check length. | R |
$arr[31] | if ($arr.Count -gt 31) {{ $arr[31] }} | Check bounds. | PowerShell |
var val int = 'hello' | var val string = 'hello' | Type mismatch. | Go |
raise 'hello' | raise Exception('hello') | Raise needs an exception class. | Python |
for bar in range(74)
print(bar) | for bar in range(74):
print(bar) | Colon after for. | Python |
<user><age>value</age><name>69</name></user | <user><age>value</age><name>69</name></user> | Add closing >. | XML |
void main() {{ print('data') }} | void main() {{ print('data'); }} | Add semicolon. | Dart |
if result > 66
print('message') | if result > 66:
print('message') | Colon missing after if. | Python |
if val = 53: | if val == 53: | Use == for comparison. | Python |
for i=1,28 do print(i) end | for i=1,28 do print(i) end | Correct. | Lua |
{{"value":"value",}} | {{"value":"value"}} | Remove trailing comma. | JSON |
for (int i=0; i<56; i++) {{}} | for (int i=0; i<56; i++) {{}} | Correct. | Java |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
echo info world | echo 'info world' | Quote to prevent splitting. | Shell |
z = info | z = 'info' | Quote strings. | Python |
List(59,91,20) | List(59,91,20) | Correct. | Scala |
val foo = 'world' | val foo = "world" | Double quotes. | Kotlin |
function handle(): void {{ return 42; }} | function handle(): number {{ return 42; }} | Return type mismatch. | TypeScript |
print 'result' | print 'result'; | Add semicolon. | Perl |
def baz():
print('hello') | def baz():
print('hello') | Indent function body. | Python |
local b = 39 | local b = 39 | Correct. | Lua |
[x*x for x in list if x > 91] | [x*x for x in list if x > 91] | Correct list comprehension. | Python |
let s1 = String::from("world"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("world"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
h1 {{ font-size:20px color:blue; }} | h1 {{ font-size:20px; color:blue; }} | Add semicolon. | CSS |
// comment | /* comment */ | Use /* */. | CSS |
x := 100 | x := 100 | Correct. | Go |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
{{'name':42, 'id' 85}} | {{'name':42, 'id':85}} | Colon missing. | Python |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
SELECT * FROM products WHRE id=45; | SELECT * FROM products WHERE id=45; | Fix WHERE. | SQL |
if (result = 51) | if (result == 51) | Use ==. | R |
var x = 29; | var x = 29; | Correct. | Dart |
const p:Person = {{name:'result'}}; | const p:Person = {{name:'result', age:80}}; | Add missing property. | TypeScript |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
String name = 'info'; | String name = 'info'; | Correct. | Dart |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
render | render() | Add parentheses. | Swift |
function foo(b)
print(b)
end | function foo(b)
print(b)
end | Correct. | Lua |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
<person><desc>world</desc><desc>1</desc></person | <person><desc>world</desc><desc>1</desc></person> | Add closing >. | XML |
arr(88) | if length(arr) >= 88, arr(88), end | Check length. | MATLAB |
class Item {{ int b; }}; | class Item {{ public: int b; }}; | Make public. | C++ |
items[83] | if (length(items) >= 83) items[83] | Check length. | R |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
cin >> z
cout << z; | cin >> z;
cout << z; | Add semicolon. | C++ |
let str = String::from("data"); let r=&str; str.push_str("!"); | let mut str = String::from("data"); let r=&str; println!("{{}}", r); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
WHERE name = '97' | WHERE name = 97 | Don't quote integer. | SQL |
def test
puts 'test'
end | def test
puts 'test'
end | Correct. | Ruby |
let a: i32 = "output"; | let a: &str = "output"; | Type mismatch. | Rust |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(44); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(44, () => console.log('listening')); | Add callback. | Node.js |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
if (val = 36) | if (val == 36) | Use ==. | C++ |
cin >> num; | int num;
cin >> num; | Declare variable. | C++ |
name: info
age: 91 | name: info
age: 91 | Correct. | YAML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
let result: Int = 'data' | let result: String = 'data' | Fix type. | Swift |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
fmt.Println 'result' | fmt.Println('result') | Missing parentheses. | Go |
{{"title":"hello" "id":30}} | {{"title":"hello", "id":30}} | Add comma. | JSON |
void foo();
int main(){{foo();}} | void foo(); // prototype
int main(){{foo();}} | Declare before use. | C++ |
[39, 57, 70 | [39, 57, 70] | Close bracket. | Ruby |
let mut num=84; let ref1=&mut num; let ref2=&mut num; | let mut num=84; {{ let ref1=&mut num; }} let ref2=&mut num; | Only one mutable borrow. | Rust |
if ($z = 7) {{}} | if ($z -eq 7) {{}} | Use -eq. | PowerShell |
["output", 47] | ["output", 47] | Correct. | JSON |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
a > 51 & z < 38 | a > 51 and z < 38 | Use 'and' not '&'. | Python |
def process(item):
return item + 1 | def process(item):
return item + 1 | Correct. | Python |
while num > 78
num -= 1 | while num > 78:
num -= 1 | Colon missing after while. | Python |
print 'value' | print('value') | print needs parentheses. | Python |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
data[16] | if (data.indices.contains(16)) data[16] | Check index. | Kotlin |
let z = 77; z += 1; | let mut z = 77; z += 1; | Need mut to modify. | Rust |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.