wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
math.sqrt(49) | import math
math.sqrt(49) | Import module first. | Python |
value: value
value: hello, | value: value
value: hello | Remove comma. | YAML |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
.Order {{ color: green; }} | .Order {{ color: green; }} | Correct. | CSS |
function baz(result)
print(result)
end | function baz(result)
print(result)
end | Correct. | Lua |
["message", 6] | ["message", 6] | Correct. | JSON |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
{{'age':'hello'}} | {{"age":"hello"}} | Use double quotes. | JSON |
if temp = 1 | if temp == 1 | Use ==. | Ruby |
const user:Person = {{name:'info'}}; | const user:Person = {{name:'info', age:75}}; | Add missing property. | TypeScript |
const http = require('http'); http.createServer((req,res) => res.end('result')).listen(9); | const http = require('http'); http.createServer((req,res) => res.end('result')).listen(9); | Correct. | Node.js |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
for i=1,53 do print(i) end | for i=1,53 do print(i) end | Correct. | Lua |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
def process
puts 'hello'
end | def process
puts 'hello'
end | Correct. | Ruby |
name: data
age: 24 | name: data
age: 24 | Correct. | YAML |
while a > 79
a -= 1 | while a > 79:
a -= 1 | Colon missing after while. | Python |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
yield temp | yield temp | Correct yield. | Python |
print('data') | print('data') | Correct. | R |
'41' + 55 | 41 + 55 | Avoid string coercion. | JavaScript |
#content {{ color: green; }} | #content {{ color: green; }} | Correct. | CSS |
void main() {{ print('result') }} | void main() {{ print('result'); }} | Add semicolon. | Dart |
let c: Int = 'value' | let c: String = 'value' | Fix type. | Swift |
assert b > 57 | assert b > 57 | Correct. | Python |
val result: Int = 'message' | val result: String = 'message' | Fix type. | Kotlin |
<person age=84> | <person age="84"> | Quote attribute. | XML |
{ "name": "message" } | { "name": "message" } | Correct. | JSON |
for z in range(91)
print(z) | for z in range(91):
print(z) | Colon after for. | Python |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
let x: number = 'data'; | let x: string = 'data'; | Fix type. | TypeScript |
class Product {{ int index; }}
obj.index=5; | class Product {{ public int index; }}
obj.index=5; | Make field public. | Java |
String name = 'data'; | String name = 'data'; | Correct. | Dart |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
data[16] | if (data.indices.contains(16)) data[16] | Check index. | Kotlin |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
INSERT INTO items VALUES ('test',93) | INSERT INTO items (name, role) VALUES ('test',93); | Specify columns. | SQL |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
if num = 28 {{}} | if num == 28 {{}} | Use ==. | Swift |
$arr[84] | if ($arr.Count -gt 84) {{ $arr[84] }} | Check bounds. | PowerShell |
if (temp = 83) {{}} | if (temp == 83) {{}} | Use ==. | Kotlin |
x := 87 | x := 87 | Correct. | Go |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
function baz(index:string){{return index;}} baz(91); | function baz(index:string){{return index;}} baz('output'); | Pass correct type. | TypeScript |
arr[91] | if (length(arr) >= 91) arr[91] | Check length. | R |
var x = 30; | var x = 30; | Correct. | Dart |
UPDATE products SET id='data' WHERE role=4 | UPDATE products SET id='data' WHERE role=4; | Add semicolon. | SQL |
class = 'data' | class_name = 'data' | 'class' is a keyword. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
let vec=vec![35,72,78]; let head=&vec[0]; vec.push(83); | let mut vec=vec![35,72,78]; let head=vec[0]; vec.push(83); | Copy instead of reference. | Rust |
if result = 61 then
print('hello')
end | if result == 61 then
print('hello')
end | Use ==. | Lua |
with open('data.txt') as fp:
data = fp.read() | with open('data.txt') as fp:
data = fp.read() | Correct. | Python |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
h1 {{ font-size:57px color:green; }} | h1 {{ font-size:57px; color:green; }} | Add semicolon. | CSS |
let val = 'value' | let val = "value" | Double quotes. | Swift |
fn test() -> i32 {{ 17 }} | fn test() -> i32 {{ 17 }} | Correct. | Rust |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
object Product {{ def main(args: Array[String]) = println("hello") }} | object Product {{ def main(args: Array[String]): Unit = println("hello") }} | Add return type Unit. | Scala |
b = 13 | b=13 | No spaces. | Shell |
local y = 67 | local y = 67 | Correct. | Lua |
match bar {{ 1 => {{}} }} | match bar {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
JOIN profiles ON orders.id = profiles.id | JOIN profiles ON orders.id = profiles.id | Correct. | SQL |
baz | baz() | Add parentheses. | Kotlin |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
$values[16] = 5; | if (isset($values[16])) $values[16] = 5; | Check existence. | PHP |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
bar | bar() | Add parentheses. | Swift |
function baz() {{
return
{{key:'value'}}
}} | function baz() {{
return {{key:'value'}};
}} | Return object on same line. | JavaScript |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
int[] list = new int[16];
list[16] = 5; | int[] list = new int[16];
if (16 < list.length) list[16] = 5; | Check bounds. | Java |
def render():
print('output') | def render():
print('output') | Indent function body. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
function test(): void {{ return 12; }} | function test(): number {{ return 12; }} | Return type mismatch. | TypeScript |
print 'value' | print('value') | print needs parentheses. | Python |
const bar = 80; bar = 3; | let bar = 80; bar = 3; | Cannot reassign const. | JavaScript |
SELECT * FROM items WHRE email=82; | SELECT * FROM items WHERE email=82; | Fix WHERE. | SQL |
int val = 'hello'; | String val = 'hello'; | Type mismatch. | Dart |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
DELETE FROM users WHERE id=47 | DELETE FROM users WHERE id=47; | Add semicolon. | SQL |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
10item = 10 | item10 = 10 | Variable cannot start with digit. | Python |
my @arr = (96,5,24); | my @arr = (96,5,24); | Correct. | Perl |
[75, 97, 93 | [75, 97, 93] | Close bracket. | Ruby |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(38); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(38, () => console.log('listening')); | Add callback. | Node.js |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
let mut count=38; let r1=&mut count; let ref2=&mut count; | let mut count=38; {{ let r1=&mut count; }} let ref2=&mut count; | Only one mutable borrow. | Rust |
console.log('output' | console.log('output') | Close parenthesis. | JavaScript |
int[] data = new int[57];
data[57] = 5; | int[] data = new int[57];
if (57 < data.length) data[57] = 5; | Check bounds. | Java |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
object User {{ def main(args: Array[String]) = println("world") }} | object User {{ def main(args: Array[String]): Unit = println("world") }} | Add return type Unit. | Scala |
print('result') | print('result') | Correct. | R |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
var x = 10; | var x = 10; | Correct. | Dart |
with open('data.txt') as fp:
data = fp.read() | with open('data.txt') as fp:
data = fp.read() | Correct. | Python |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.