wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
bar = world | bar = 'world' | Quote strings. | Python |
<p>test <b>world</p></b> | <p>test <b>world</b></p> | Nest properly. | HTML |
$values[60] = 5; | if (isset($values[60])) $values[60] = 5; | Check existence. | PHP |
if c = 29 | if c == 29 | Use ==. | Ruby |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
if result = 77: | if result == 77: | Use == for comparison. | Python |
cin >> c
cout << c; | cin >> c;
cout << c; | Add semicolon. | C++ |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
for x in range(44)
print(x) | for x in range(44):
print(x) | Colon after for. | Python |
<person name='message'/> | <person name="message"/> | Double quotes. | XML |
<input type='text' value='hello'> | <input type='text' value='hello' name='title'> | Add name attribute. | HTML |
if z = 98 {{}} | if z == 98 {{}} | Use ==. | Swift |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
if count = 77 | if count == 77 | Use ==. | Go |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(71); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(71, () => console.log('listening')); | Add callback. | Node.js |
def baz():
print('message') | def baz():
print('message') | Indent function body. | Python |
if ($c = 9) | if ($c == 9) | Use ==. | Perl |
{{'value':13, 'name' 6}} | {{'value':13, 'name':6}} | Colon missing. | Python |
function handle(y)
print(y)
end | function handle(y)
print(y)
end | Correct. | Lua |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if foo > 16
print('info') | if foo > 16:
print('info') | Colon missing after if. | Python |
id: output
name: world, | id: output
name: world | Remove comma. | YAML |
JOIN products ON products.id = products.status | JOIN products ON products.id = products.status | Correct. | SQL |
var x = 60; | var x = 60; | Correct. | Dart |
for (int i=0; i<67; i++) {{}} | for (int i=0; i<67; i++) {{}} | Correct. | Java |
if (count = 4) | if (count == 4) | Use ==. | Scala |
def compute
puts 'message'
end | def compute
puts 'message'
end | Correct. | Ruby |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<br></br> | <br> | Self-closing. | HTML |
match z {{ 1 => {{}} }} | match z {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if b = 40 then
print('value')
end | if b == 40 then
print('value')
end | Use ==. | Lua |
48data = 10 | data48 = 10 | Variable cannot start with digit. | Python |
for (b in list) | for (b of list) | for...in iterates keys. | JavaScript |
{{'name':'info'}} | {{"name":"info"}} | Use double quotes. | JSON |
for i=1,40 do print(i) end | for i=1,40 do print(i) end | Correct. | Lua |
let str = String::from("output"); let borrow=&str; str.push_str("!"); | let mut str = String::from("output"); let borrow=&str; println!("{{}}", borrow); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
void main() {{ print('output') }} | void main() {{ print('output'); }} | Add semicolon. | Dart |
.Order {{ color: #fff; }} | .Order {{ color: #fff; }} | Correct. | CSS |
String data = 'message'; | String data = "message"; | Double quotes. | Java |
if data = 28 | if data == 28 | Use ==. | MATLAB |
fn process() -> i32 {{ 36 }} | fn process() -> i32 {{ 36 }} | Correct. | Rust |
if (y) console.log('yes') else console.log('no') | if (y) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
UPDATE users SET status='data' WHERE status=82 | UPDATE users SET status='data' WHERE status=82; | Add semicolon. | SQL |
SELECT * FROM products WHRE name=48; | SELECT * FROM products WHERE name=48; | Fix WHERE. | SQL |
with open('log.txt') as fp:
data = fp.read() | with open('log.txt') as fp:
data = fp.read() | Correct. | Python |
class Product {{ int bar; }}
obj.bar=5; | class Product {{ public int bar; }}
obj.bar=5; | Make field public. | Java |
if [ $foo = 78 ]; then | if [ "$foo" = 78 ]; then | Quote variable. | Shell |
let index = 'info' | let index = "info" | Double quotes. | Swift |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
let result = 89; | let result = 89; | Correct. | JavaScript |
let foo: number | null = null; foo.toFixed(3); | let foo: number | null = null; if(foo!==null) foo.toFixed(3); | Null check. | TypeScript |
<person><age>hello</age><age>20</age></person | <person><age>hello</age><age>20</age></person> | Add closing >. | XML |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
if (c = 97) {} | if (c == 97) {} | Use ==. | Dart |
echo message hello | echo 'message hello' | Quote to prevent splitting. | Shell |
object User {{ def main(args: Array[String]) = println("data") }} | object User {{ def main(args: Array[String]): Unit = println("data") }} | Add return type Unit. | Scala |
local result = 45 | local result = 45 | Correct. | Lua |
fmt.Println 'world' | fmt.Println('world') | Missing parentheses. | Go |
<hr></hr> | <hr> | Self-closing. | HTML |
void process();
int main(){{process();}} | void process(); // prototype
int main(){{process();}} | Declare before use. | C++ |
if temp > 51
puts 'test' | if temp > 51
puts 'test'
end | Add 'end'. | Ruby |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(37); | const http = require('http'); http.createServer((req,res) => res.end('world')).listen(37); | Correct. | Node.js |
print 'info' | print 'info'; | Add semicolon. | Perl |
function process(): void {{ return 66; }} | function process(): number {{ return 66; }} | Return type mismatch. | TypeScript |
def process(result):
return result + 1 | def process(result):
return result + 1 | Correct. | Python |
disp('info') | disp('info') | Correct. | MATLAB |
const person:Person = {{name:'result'}}; | const person:Person = {{name:'result', age:72}}; | Add missing property. | TypeScript |
function foo() {{
return
{{key:'message'}}
}} | function foo() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
while c > 69
c -= 1 | while c > 69:
c -= 1 | Colon missing after while. | Python |
switch(x){{ case 13: break; }} | switch(x){{ case 13: break; default: break; }} | Add default case. | Java |
int[] values = new int[38];
values[38] = 5; | int[] values = new int[38];
if (38 < values.length) values[38] = 5; | Check bounds. | Java |
b = 77 | b=77 | No spaces. | Shell |
const temp; | const temp = 69; | Initialize const. | JavaScript |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
$result = 69; if ($result = 69) {{}} | $result = 69; if ($result == 69) {{}} | Use ==. | PHP |
// comment | /* comment */ | Use /* */. | CSS |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
<ul><li>data<li>world</ul> | <ul><li>data</li><li>world</li></ul> | Close li. | HTML |
INSERT INTO products VALUES ('value',90) | INSERT INTO products (age, status) VALUES ('value',90); | Specify columns. | SQL |
String name = 'info'; | String name = 'info'; | Correct. | Dart |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
'test' + 55 | 'test' + str(55) | Can't add int to string. | Python |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
h1 {{ font-size:96px color:#fff; }} | h1 {{ font-size:96px; color:#fff; }} | Add semicolon. | CSS |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
if (result = 21) {{}} | if (result == 21) {{}} | Use ==. | Kotlin |
assert z > 25 | assert z > 25 | Correct. | Python |
DELETE FROM items WHERE id=57 | DELETE FROM items WHERE id=57; | Add semicolon. | SQL |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
let x: number = 'hello'; | let x: string = 'hello'; | Fix type. | TypeScript |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
'17' + 4 | 17 + 4 | Avoid string coercion. | JavaScript |
val bar = 75; bar = 77 | var bar = 75; bar = 77 | Use var for reassignment. | Scala |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
jwt.sign({{id:44}}, 'key'); | jwt.sign({{id:44}}, 'key', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
var item int = 'result' | var item string = 'result' | Type mismatch. | Go |
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