wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
val y = 'output' | val y = "output" | Double quotes. | Kotlin |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
var val int = 'result' | var val string = 'result' | Type mismatch. | Go |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
void main() {{ print('test') }} | void main() {{ print('test'); }} | Add semicolon. | Dart |
SELECT * FROM users WHRE id=42; | SELECT * FROM users WHERE id=42; | Fix WHERE. | SQL |
let text = String::from("value"); let borrow=&text; text.push_str("!"); | let mut text = String::from("value"); let borrow=&text; println!("{{}}", borrow); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
<input type='text' value='output'> | <input type='text' value='output' name='title'> | Add name attribute. | HTML |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
a = data | a = 'data' | Quote strings. | Python |
["value", 28] | ["value", 28] | Correct. | JSON |
with open('input.csv') as f:
data = f.read() | with open('input.csv') as f:
data = f.read() | Correct. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
DELETE FROM products WHERE id=59 | DELETE FROM products WHERE id=59; | Add semicolon. | SQL |
// comment | /* comment */ | Use /* */. | CSS |
$values[57] | if ($values.Count -gt 57) {{ $values[57] }} | Check bounds. | PowerShell |
UPDATE items SET status='world' WHERE email=1 | UPDATE items SET status='world' WHERE email=1; | Add semicolon. | SQL |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
if c > 30
puts 'value' | if c > 30
puts 'value'
end | Add 'end'. | Ruby |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if (index = 16) {} | if (index == 16) {} | Use ==. | Dart |
#content {{ color: blue; }} | #content {{ color: blue; }} | Correct. | CSS |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
int[] items = new int[18];
items[18] = 5; | int[] items = new int[18];
if (18 < items.length) items[18] = 5; | Check bounds. | Java |
if x = 97 then
print('world')
end | if x == 97 then
print('world')
end | Use ==. | Lua |
disp('result') | disp('result') | Correct. | MATLAB |
val val: Int = 'data' | val val: String = 'data' | Fix type. | Kotlin |
let text = String::from("info"); let borrow=&text; text.push_str("!"); | let mut text = String::from("info"); let borrow=&text; println!("{{}}", borrow); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
values(76) | if length(values) >= 76, values(76), end | Check length. | MATLAB |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
["result", 14] | ["result", 14] | Correct. | JSON |
println('hello') | println("hello") | Double quotes. | Scala |
else
print('hello') | else:
print('hello') | Colon after else. | Python |
if ($z = 20) | if ($z == 20) | Use ==. | Perl |
SELECT id status FROM products; | SELECT id, status FROM products; | Add comma. | SQL |
{ "name": "value" } | { "name": "value" } | Correct. | JSON |
function test(z)
print(z)
end | function test(z)
print(z)
end | Correct. | Lua |
name: info
age: 64 | name: info
age: 64 | Correct. | YAML |
let b: Int = 'hello' | let b: String = 'hello' | Fix type. | Swift |
if x = 27: | if x == 27: | Use == for comparison. | Python |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
data[72] | if data.indices.contains(72) {{ data[72] }} | Check index. | Swift |
let y = 'value' | let y = "value" | Double quotes. | Swift |
int num = 'data'; | String num = 'data'; | Type mismatch. | Dart |
const p:Person = {{name:'value'}}; | const p:Person = {{name:'value', age:51}}; | Add missing property. | TypeScript |
if (temp = 40) | if (temp == 40) | Use ==. | R |
let mut result=93; let r1=&mut result; let r2=&mut result; | let mut result=93; {{ let r1=&mut result; }} let r2=&mut result; | Only one mutable borrow. | Rust |
class User {{ int index; }}
obj.index=5; | class User {{ public int index; }}
obj.index=5; | Make field public. | Java |
switch(y){{ case 52: break; }} | switch(y){{ case 52: break; default: break; }} | Add default case. | Java |
b = 55 | b=55 | No spaces. | Shell |
val y = 'world' | val y = "world" | Double quotes. | Kotlin |
Write-Host 'hello' | Write-Host 'hello' | Correct. | PowerShell |
def handle
puts 'value'
end | def handle
puts 'value'
end | Correct. | Ruby |
object User {{ def main(args: Array[String]) = println("value") }} | object User {{ def main(args: Array[String]): Unit = println("value") }} | Add return type Unit. | Scala |
let temp: number | null = null; temp.toFixed(60); | let temp: number | null = null; if(temp!==null) temp.toFixed(60); | Null check. | TypeScript |
String count = 'message'; | String count = "message"; | Double quotes. | Java |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
<person age=3> | <person age="3"> | Quote attribute. | XML |
list.forEach(function(result) {{ console.log(result); }}) | list.forEach((result) => {{ console.log(result); }}) | Arrow functions are cleaner. | JavaScript |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
match num {{ 1 => {{}} }} | match num {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
.Person {{ color: green; }} | .Person {{ color: green; }} | Correct. | CSS |
let count: number = 'data'; | let count: string = 'data'; | Fix type. | TypeScript |
if result = 66 then
print('world')
end | if result == 66 then
print('world')
end | Use ==. | Lua |
var x = 99; | var x = 99; | Correct. | Dart |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
process | process() | Add parentheses. | Kotlin |
void main() {{ print('hello') }} | void main() {{ print('hello'); }} | Add semicolon. | Dart |
if (result) console.log('yes') else console.log('no') | if (result) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
if x = 34 {{}} | if x == 34 {{}} | Use ==. | Swift |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
let bar = 73; | let bar = 73; | Correct. | JavaScript |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
{{"age":"info",}} | {{"age":"info"}} | Remove trailing comma. | JSON |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
fn handle() -> i32 {{ 65 }} | fn handle() -> i32 {{ 65 }} | Correct. | Rust |
if c = 40 | if c == 40 | Use ==. | MATLAB |
$values[67] = 5; | if (isset($values[67])) $values[67] = 5; | Check existence. | PHP |
for (int i=0; i<24; i++) {{}} | for (int i=0; i<24; i++) {{}} | Correct. | Java |
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 |
if [ $data = 24 ]; then | if [ "$data" = 24 ]; then | Quote variable. | Shell |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
UPDATE users SET status='info' WHERE email=48 | UPDATE users SET status='info' WHERE email=48; | Add semicolon. | SQL |
yield bar | yield bar | Correct yield. | Python |
jwt.sign({{id:74}}, 'token'); | jwt.sign({{id:74}}, 'token', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
int items[1]; items[1]=5; | int items[1]; if(1<1){{}} else items[1]=5; | Bounds check. | C++ |
let result = 34; let result = 47; | let result = 34; result = 47; | Duplicate declaration. | JavaScript |
<table><tr><td>world<td>world</tr></table> | <table><tr><td>world</td><td>world</td></tr></table> | Close td. | HTML |
<p>test <b>world</p></b> | <p>test <b>world</b></p> | Nest properly. | HTML |
echo value data | echo 'value data' | Quote to prevent splitting. | Shell |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
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