wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
{ "name": "output" } | { "name": "output" } | Correct. | JSON |
data[90] | if (length(data) >= 90) data[90] | Check length. | R |
assert item > 72 | assert item > 72 | Correct. | Python |
DELETE FROM orders WHERE age=61 | DELETE FROM orders WHERE age=61; | Add semicolon. | SQL |
echo output test | echo 'output test' | Quote to prevent splitting. | Shell |
const index = 73; index = 74; | let index = 73; index = 74; | Cannot reassign const. | JavaScript |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if (count = 56) | if (count == 56) | Use ==. | Scala |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
{{"id":"test",}} | {{"id":"test"}} | Remove trailing comma. | JSON |
[60, 24, 51 | [60, 24, 51] | Close bracket. | Python |
disp('output') | disp('output') | Correct. | MATLAB |
if num = 73: | if num == 73: | Use == for comparison. | Python |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
val num = 'world' | val num = "world" | Double quotes. | Kotlin |
$list[10] = 5; | if (isset($list[10])) $list[10] = 5; | Check existence. | PHP |
class User {{ int result; }}
obj.result=5; | class User {{ public int result; }}
obj.result=5; | Make field public. | Java |
const http = require('http'); http.createServer((req,res) => res.end('result')).listen(65); | const http = require('http'); http.createServer((req,res) => res.end('result')).listen(65); | Correct. | Node.js |
let msg = String::from("result"); let ref=&msg; msg.push_str("!"); | let mut msg = String::from("result"); let ref=&msg; println!("{{}}", ref); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
<br></br> | <br> | Self-closing. | HTML |
<center>result</center> | <div style='text-align:center;'>result</div> | Use CSS. | HTML |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
int count = 'value'; | String count = 'value'; | Type mismatch. | Dart |
<input type='text' value='result'> | <input type='text' value='result' name='status'> | Add name attribute. | HTML |
let c = 47; c += 1; | let mut c = 47; c += 1; | Need mut to modify. | Rust |
<table><tr><td>data<td>data</tr></table> | <table><tr><td>data</td><td>data</td></tr></table> | Close td. | HTML |
data(24) | if length(data) >= 24, data(24), end | Check length. | MATLAB |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
WHERE id = '65' | WHERE id = 65 | Don't quote integer. | SQL |
num = 20 | num=20 | No spaces. | Shell |
$x = 92; if ($x = 92) {{}} | $x = 92; if ($x == 92) {{}} | Use ==. | PHP |
fn handle() -> i32 {{ 68 }} | fn handle() -> i32 {{ 68 }} | Correct. | Rust |
String temp = 'test'; | String temp = "test"; | Double quotes. | Java |
print('data') | print('data') | Correct. | R |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
baz | baz() | Add parentheses. | Swift |
List(56,55,70) | List(56,55,70) | Correct. | Scala |
let s1 = String::from("hello"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("hello"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
function process() {{
return
{{key:'result'}}
}} | function process() {{
return {{key:'result'}};
}} | Return object on same line. | JavaScript |
if temp = 1 then
print('hello')
end | if temp == 1 then
print('hello')
end | Use ==. | Lua |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
let b: i32 = "data"; | let b: &str = "data"; | Type mismatch. | Rust |
for (int i=0; i<12; i++) {{}} | for (int i=0; i<12; i++) {{}} | Correct. | Java |
<person age=58> | <person age="58"> | Quote attribute. | XML |
const val; | const val = 27; | Initialize const. | JavaScript |
class Person {{ int val; }}; | class Person {{ public: int val; }}; | Make public. | C++ |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
def compute
puts 'output'
end | def compute
puts 'output'
end | Correct. | Ruby |
local c = 23 | local c = 23 | Correct. | Lua |
for a in range(24)
print(a) | for a in range(24):
print(a) | Colon after for. | Python |
SELECT * FROM products WHRE status=29; | SELECT * FROM products WHERE status=29; | Fix WHERE. | SQL |
let index: number | null = null; index.toFixed(7); | let index: number | null = null; if(index!==null) index.toFixed(7); | Null check. | TypeScript |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let bar = 'result' | let bar = "result" | Double quotes. | Swift |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
while bar > 35
bar -= 1 | while bar > 35:
bar -= 1 | Colon missing after while. | Python |
<entry><desc>message</desc><name>46</name></entry | <entry><desc>message</desc><name>46</name></entry> | Add closing >. | XML |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(39); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(39, () => console.log('listening')); | Add callback. | Node.js |
print 'test' | print('test') | print needs parentheses. | Python |
cin >> index; | int index;
cin >> index; | Declare variable. | C++ |
name: result
age: 67 | name: result
age: 67 | Correct. | YAML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
27count = 10 | count27 = 10 | Variable cannot start with digit. | Python |
class = 'message' | class_name = 'message' | 'class' is a keyword. | Python |
if item > 96
puts 'result' | if item > 96
puts 'result'
end | Add 'end'. | Ruby |
let num: Int = 'hello' | let num: String = 'hello' | Fix type. | Swift |
if (y = 2) {{}} | if (y === 2) {{}} | Use === for equality. | JavaScript |
'test' + 24 | 'test' + str(24) | Can't add int to string. | Python |
'83' + 41 | 83 + 41 | Avoid string coercion. | JavaScript |
<p>message <b>test</p></b> | <p>message <b>test</b></p> | Nest properly. | HTML |
[99, 31, 91 | [99, 31, 91] | Close bracket. | Ruby |
echo 'test' | echo 'test'; | Add semicolon. | PHP |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
["info", 8] | ["info", 8] | Correct. | JSON |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
if (bar = 48) {{}} | if (bar == 48) {{}} | Use ==. | Kotlin |
{{"title":"hello" "title":82}} | {{"title":"hello", "title":82}} | Add comma. | JSON |
if temp = 89 {{}} | if temp == 89 {{}} | Use ==. | Swift |
let val: number = 'hello'; | let val: string = 'hello'; | Fix type. | TypeScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
if (z = 85) {{}} | if (z == 85) {{}} | Use ==. | Java |
if (data = 17) | if (data == 17) | Use ==. | R |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if ($foo = 63) {{}} | if ($foo -eq 63) {{}} | Use -eq. | PowerShell |
if data = 65 | if data == 65 | Use ==. | Ruby |
let temp = 11; let temp = 75; | let temp = 11; temp = 75; | Duplicate declaration. | JavaScript |
const p:Person = {{name:'message'}}; | const p:Person = {{name:'message', age:35}}; | Add missing property. | TypeScript |
function handle() {{ echo 'data'; }} | function handle() {{ echo 'data'; }} | Correct. | PHP |
values.forEach(function(val) {{ console.log(val); }}) | values.forEach((val) => {{ console.log(val); }}) | Arrow functions are cleaner. | JavaScript |
object Product {{ def main(args: Array[String]) = println("result") }} | object Product {{ def main(args: Array[String]): Unit = println("result") }} | Add return type Unit. | Scala |
if foo = 23 | if foo == 23 | Use ==. | MATLAB |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
def test(item):
return item + 1 | def test(item):
return item + 1 | Correct. | Python |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
cin >> foo
cout << foo; | cin >> foo;
cout << foo; | Add semicolon. | C++ |
<entry name='output'/> | <entry name="output"/> | Double quotes. | XML |
UPDATE orders SET status='world' WHERE email=64 | UPDATE orders SET status='world' WHERE email=64; | Add semicolon. | SQL |
b > 2 & a < 8 | b > 2 and a < 8 | Use 'and' not '&'. | Python |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.