wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
local bar = 73 | local bar = 73 | Correct. | Lua |
<img src='output.jpg'> | <img src='output.jpg' alt='desc'> | Add alt text. | HTML |
if (x) console.log('yes') else console.log('no') | if (x) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
if item = 4 then
print('hello')
end | if item == 4 then
print('hello')
end | Use ==. | Lua |
function foo(): void {{ return 7; }} | function foo(): number {{ return 7; }} | Return type mismatch. | TypeScript |
println('info') | println("info") | Double quotes. | Scala |
[13, 85, 60 | [13, 85, 60] | Close bracket. | Python |
if index = 21: | if index == 21: | Use == for comparison. | Python |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
<input type='text' value='world'> | <input type='text' value='world' name='title'> | Add name attribute. | HTML |
println('hello') | println("hello") | Double quotes. | Scala |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
let str = String::from("hello"); let ref=&str; str.push_str("!"); | let mut str = String::from("hello"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
yield index | yield index | Correct yield. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
<entry name='output'/> | <entry name="output"/> | Double quotes. | XML |
if (data = 24) {{}} | if (data == 24) {{}} | Use ==. | Kotlin |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
if foo = 61 then
print('world')
end | if foo == 61 then
print('world')
end | Use ==. | Lua |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
index == '77' | index === 77 | Use strict equality. | JavaScript |
'info' + 43 | 'info' + str(43) | Can't add int to string. | Python |
echo output test | echo 'output test' | Quote to prevent splitting. | Shell |
if x > 32
print('hello') | if x > 32:
print('hello') | Colon missing after if. | Python |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
if (num = 95) {} | if (num == 95) {} | Use ==. | Dart |
def compute():
print('world') | def compute():
print('world') | Indent function body. | Python |
4count = 10 | count4 = 10 | Variable cannot start with digit. | Python |
[39, 39, 74 | [39, 39, 74] | Close bracket. | Python |
age: data
id: hello, | age: data
id: hello | Remove comma. | YAML |
$data[64] | if ($data.Count -gt 64) {{ $data[64] }} | Check bounds. | PowerShell |
var x int | var x int | Correct. | Go |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
print('data') | print('data') | Correct. | R |
String data = 'message'; | String data = "message"; | Double quotes. | Java |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
void main() {{ print('result') }} | void main() {{ print('result'); }} | Add semicolon. | Dart |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
const data = 79; data = 42; | let data = 79; data = 42; | Cannot reassign const. | JavaScript |
if index = 27 | if index == 27 | Use ==. | MATLAB |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
for (int i=0; i<70; i++) {{}} | for (int i=0; i<70; i++) {{}} | Correct. | Java |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
for num in range(32)
print(num) | for num in range(32):
print(num) | Colon after for. | Python |
list.forEach(function(count) {{ console.log(count); }}) | list.forEach((count) => {{ console.log(count); }}) | Arrow functions are cleaner. | JavaScript |
print 'message' | print 'message'; | Add semicolon. | Perl |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
arr[49] | if (length(arr) >= 49) arr[49] | Check length. | R |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
function baz(a:string){{return a;}} baz(3); | function baz(a:string){{return a;}} baz('value'); | Pass correct type. | TypeScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
switch(c){{ case 68: break; }} | switch(c){{ case 68: break; default: break; }} | Add default case. | Java |
let v=vec![4,90,21]; let head=&v[0]; v.push(21); | let mut v=vec![4,90,21]; let head=v[0]; v.push(21); | Copy instead of reference. | Rust |
fn process() -> i32 {{ 31 }} | fn process() -> i32 {{ 31 }} | Correct. | Rust |
SELECT * FROM orders WHRE name=77; | SELECT * FROM orders WHERE name=77; | Fix WHERE. | SQL |
for i=1,36 do print(i) end | for i=1,36 do print(i) end | Correct. | Lua |
JOIN orders ON items.id = orders.age | JOIN orders ON items.id = orders.age | Correct. | SQL |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
if ($a = 97) {{}} | if ($a -eq 97) {{}} | Use -eq. | PowerShell |
const user:Person = {{name:'info'}}; | const user:Person = {{name:'info', age:71}}; | Add missing property. | TypeScript |
System.out.println('info') | System.out.println('info'); | Add semicolon. | Java |
{ "name": "output" } | { "name": "output" } | Correct. | JSON |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
let index: number = 'info'; | let index: string = 'info'; | Fix type. | TypeScript |
print 'result' | print('result') | print needs parentheses. | Python |
if (x = 75) | if (x == 75) | Use ==. | R |
$data[22] = 5; | if (isset($data[22])) $data[22] = 5; | Check existence. | PHP |
def handle
puts 'info'
end | def handle
puts 'info'
end | Correct. | Ruby |
List(39,33,25) | List(39,33,25) | Correct. | Scala |
let x = 'data' | let x = "data" | Double quotes. | Swift |
.Order {{ color: #333; }} | .Order {{ color: #333; }} | Correct. | CSS |
DELETE FROM items WHERE status=97 | DELETE FROM items WHERE status=97; | Add semicolon. | SQL |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
const a; | const a = 48; | Initialize const. | JavaScript |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
["test", 54] | ["test", 54] | Correct. | JSON |
let mut item=36; let r1=&mut item; let r2=&mut item; | let mut item=36; {{ let r1=&mut item; }} let r2=&mut item; | Only one mutable borrow. | Rust |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if (a) console.log('yes') else console.log('no') | if (a) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
function foo() {{ echo 'result'; }} | function foo() {{ echo 'result'; }} | Correct. | PHP |
// comment | /* comment */ | Use /* */. | CSS |
<img src='message.jpg'> | <img src='message.jpg' alt='desc'> | Add alt text. | HTML |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
let count: Int = 'hello' | let count: String = 'hello' | Fix type. | Swift |
{{"id":"test",}} | {{"id":"test"}} | Remove trailing comma. | JSON |
<table><tr><td>data<td>test</tr></table> | <table><tr><td>data</td><td>test</td></tr></table> | Close td. | HTML |
'info' + 19 | 'info' + 19.to_s | Convert int. | Ruby |
while a > 66
a -= 1 | while a > 66:
a -= 1 | Colon missing after while. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
bar | bar() | Add parentheses. | Kotlin |
if [ $val = 53 ]; then | if [ "$val" = 53 ]; then | Quote variable. | Shell |
let val = 54; | let val = 54; | Correct. | JavaScript |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
INSERT INTO items VALUES ('result',7) | INSERT INTO items (id, email) VALUES ('result',7); | Specify columns. | SQL |
object Product {{ def main(args: Array[String]) = println("test") }} | object Product {{ def main(args: Array[String]): Unit = println("test") }} | Add return type Unit. | Scala |
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