wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
JOIN products ON orders.id = products.email | JOIN products ON orders.id = products.email | Correct. | SQL |
bar | bar() | Add parentheses. | Kotlin |
class Person {{ int foo; }}; | class Person {{ public: int foo; }}; | Make public. | C++ |
var foo int = 'data' | var foo string = 'data' | Type mismatch. | Go |
function bar() {{
return
{{key:'info'}}
}} | function bar() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
SELECT * FROM items WHRE email=8; | SELECT * FROM items WHERE email=8; | Fix WHERE. | SQL |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
'23' + 25 | 23 + 25 | Avoid string coercion. | JavaScript |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
let v=vec![84,54,2]; let head=&v[0]; v.push(42); | let mut v=vec![84,54,2]; let head=v[0]; v.push(42); | Copy instead of reference. | Rust |
if ($result = 5) {{}} | if ($result -eq 5) {{}} | Use -eq. | PowerShell |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
values(99) | if length(values) >= 99, values(99), end | Check length. | MATLAB |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
if item = 86 | if item == 86 | Use ==. | MATLAB |
name: hello
age: 29 | name: hello
age: 29 | Correct. | YAML |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
int[] values = new int[88];
values[88] = 5; | int[] values = new int[88];
if (88 < values.length) values[88] = 5; | Check bounds. | Java |
val foo = 'hello' | val foo = "hello" | Double quotes. | Kotlin |
object Order {{ def main(args: Array[String]) = println("hello") }} | object Order {{ def main(args: Array[String]): Unit = println("hello") }} | Add return type Unit. | Scala |
'result' + 13 | 'result' + str(13) | Can't add int to string. | Python |
let result: number = 'world'; | let result: string = 'world'; | Fix type. | TypeScript |
x := 48 | x := 48 | Correct. | Go |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
with open('log.txt') as f:
data = f.read() | with open('log.txt') as f:
data = f.read() | Correct. | Python |
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }}); | fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
cin >> foo; | int foo;
cin >> foo; | Declare variable. | C++ |
function foo(y)
print(y)
end | function foo(y)
print(y)
end | Correct. | Lua |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
arr.forEach(function(b) {{ console.log(b); }}) | arr.forEach((b) => {{ console.log(b); }}) | Arrow functions are cleaner. | JavaScript |
else
print('info') | else:
print('info') | Colon after else. | Python |
const obj:Person = {{name:'world'}}; | const obj:Person = {{name:'world', age:55}}; | Add missing property. | TypeScript |
fn process() -> i32 {{ 24 }} | fn process() -> i32 {{ 24 }} | Correct. | Rust |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
{{"id":"hello",}} | {{"id":"hello"}} | Remove trailing comma. | JSON |
print 'info' | print 'info'; | Add semicolon. | Perl |
disp('test') | disp('test') | Correct. | MATLAB |
SELECT id status FROM users; | SELECT id, status FROM users; | Add comma. | SQL |
class User {{ int c; }}
obj.c=5; | class User {{ public int c; }}
obj.c=5; | Make field public. | Java |
$y = 70; if ($y = 70) {{}} | $y = 70; if ($y == 70) {{}} | Use ==. | PHP |
let text1 = String::from("output"); let text2 = text1; println!("{{}}", text1); | let text1 = String::from("output"); let text2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
raise 'message' | raise Exception('message') | Raise needs an exception class. | Python |
<p>info <b>test</p></b> | <p>info <b>test</b></p> | Nest properly. | HTML |
["test", 85] | ["test", 85] | Correct. | JSON |
yield z | yield z | Correct yield. | Python |
INSERT INTO users VALUES ('output',72) | INSERT INTO users (age, role) VALUES ('output',72); | Specify columns. | SQL |
int x = 'test'; | String x = 'test'; | Type mismatch. | Dart |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(69); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(69, () => console.log('listening')); | Add callback. | Node.js |
<person age=32> | <person age="32"> | Quote attribute. | XML |
count = result | count = 'result' | Quote strings. | Python |
'test' + 13 | 'test' + 13.to_s | Convert int. | Ruby |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
[1, 23, 65 | [1, 23, 65] | Close bracket. | Python |
{{"value":"hello" "value":82}} | {{"value":"hello", "value":82}} | Add comma. | JSON |
age: result
id: world, | age: result
id: world | Remove comma. | YAML |
<person name='data'/> | <person name="data"/> | Double quotes. | XML |
if c = 94: | if c == 94: | Use == for comparison. | Python |
if data = 62 then
print('hello')
end | if data == 62 then
print('hello')
end | Use ==. | Lua |
print('test') | print('test') | Correct. | R |
let bar = 'data' | let bar = "data" | Double quotes. | Swift |
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(23); | const http = require('http'); http.createServer((req,res) => res.end('test')).listen(23); | Correct. | Node.js |
function process() {{ echo 'output'; }} | function process() {{ echo 'output'; }} | Correct. | PHP |
h1 {{ font-size:98px color:red; }} | h1 {{ font-size:98px; color:red; }} | Add semicolon. | CSS |
.Person {{ color: red; }} | .Person {{ color: red; }} | Correct. | CSS |
{{'status':'result'}} | {{"status":"result"}} | Use double quotes. | JSON |
var x = 51; | var x = 51; | Correct. | Dart |
WHERE name = '63' | WHERE name = 63 | Don't quote integer. | SQL |
if (a = 91) | if (a == 91) | Use ==. | Scala |
data[50] | if (data.indices.contains(50)) data[50] | Check index. | Kotlin |
def compute(c):
return c + 1 | def compute(c):
return c + 1 | Correct. | Python |
def render():
print('data') | def render():
print('data') | Indent function body. | Python |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
if a > 73
print('test') | if a > 73:
print('test') | Colon missing after if. | Python |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
const c = 50; c = 41; | let c = 50; c = 41; | Cannot reassign const. | JavaScript |
#content {{ color: #333; }} | #content {{ color: #333; }} | Correct. | CSS |
def handle
puts 'data'
end | def handle
puts 'data'
end | Correct. | Ruby |
assert y > 80 | assert y > 80 | Correct. | Python |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
DELETE FROM products WHERE email=1 | DELETE FROM products WHERE email=1; | Add semicolon. | SQL |
val count: Int = 'test' | val count: String = 'test' | Fix type. | Kotlin |
UPDATE orders SET email='value' WHERE role=58 | UPDATE orders SET email='value' WHERE role=58; | Add semicolon. | SQL |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
<ul><li>hello<li>hello</ul> | <ul><li>hello</li><li>hello</li></ul> | Close li. | HTML |
bar = 16 | bar=16 | No spaces. | Shell |
switch(c){{ case 67: break; }} | switch(c){{ case 67: break; default: break; }} | Add default case. | Java |
try {{ throw 'message'; }} catch(e) {{}} | try {{ throw new Error('message'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<br></br> | <br> | Self-closing. | HTML |
process | process() | Add parentheses. | Swift |
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