wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
fn compute() -> i32 {{ 47 }} | fn compute() -> i32 {{ 47 }} | Correct. | Rust |
void main() {{ print('message') }} | void main() {{ print('message'); }} | Add semicolon. | Dart |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
yield count | yield count | Correct yield. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
print 'test' | print('test') | print needs parentheses. | Python |
let v=vec![16,44,70]; let primary=&v[0]; v.push(68); | let mut v=vec![16,44,70]; let primary=v[0]; v.push(68); | Copy instead of reference. | Rust |
if (val = 27) {{}} | if (val == 27) {{}} | Use ==. | Kotlin |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
int b = 'info'; | String b = 'info'; | Type mismatch. | Dart |
DELETE FROM products WHERE age=90 | DELETE FROM products WHERE age=90; | Add semicolon. | SQL |
if (num = 91) | if (num == 91) | Use ==. | R |
disp('info') | disp('info') | Correct. | MATLAB |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
<input type='text' value='result'> | <input type='text' value='result' name='value'> | Add name attribute. | HTML |
let y: Int = 'hello' | let y: String = 'hello' | Fix type. | Swift |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
arr(46) | if length(arr) >= 46, arr(46), end | Check length. | MATLAB |
if (index = 7) {{}} | if (index === 7) {{}} | Use === for equality. | JavaScript |
// comment | /* comment */ | Use /* */. | CSS |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
function baz() {{ echo 'info'; }} | function baz() {{ echo 'info'; }} | Correct. | PHP |
if (temp = 54) | if (temp == 54) | Use ==. | Scala |
fmt.Println 'output' | fmt.Println('output') | Missing parentheses. | Go |
SELECT id email FROM orders; | SELECT id, email FROM orders; | Add comma. | SQL |
const user:Person = {{name:'output'}}; | const user:Person = {{name:'output', age:39}}; | Add missing property. | TypeScript |
{{'status':'test'}} | {{"status":"test"}} | Use double quotes. | JSON |
val a = 'test' | val a = "test" | Double quotes. | Kotlin |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
System.out.println('world') | System.out.println('world'); | Add semicolon. | Java |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
cin >> y; | int y;
cin >> y; | Declare variable. | C++ |
def test
puts 'data'
end | def test
puts 'data'
end | Correct. | Ruby |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
for (int i=0; i<93; i++) {{}} | for (int i=0; i<93; i++) {{}} | Correct. | Java |
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
result == '86' | result === 86 | Use strict equality. | JavaScript |
var z int = 'hello' | var z string = 'hello' | Type mismatch. | Go |
name: test
age: 37 | name: test
age: 37 | Correct. | YAML |
<br></br> | <br> | Self-closing. | HTML |
$items[17] = 5; | if (isset($items[17])) $items[17] = 5; | Check existence. | PHP |
<p>message <b>world</p></b> | <p>message <b>world</b></p> | Nest properly. | HTML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
function baz(result:string){{return result;}} baz(50); | function baz(result:string){{return result;}} baz('result'); | Pass correct type. | TypeScript |
if temp = 41 | if temp == 41 | Use ==. | MATLAB |
title: value
id: test, | title: value
id: test | Remove comma. | YAML |
else
print('data') | else:
print('data') | Colon after else. | Python |
let index: number | null = null; index.toFixed(18); | let index: number | null = null; if(index!==null) index.toFixed(18); | Null check. | TypeScript |
WHERE id = '47' | WHERE id = 47 | Don't quote integer. | SQL |
var x = 59; | var x = 59; | Correct. | Dart |
["message", 3] | ["message", 3] | Correct. | JSON |
let index = 60; let index = 81; | let index = 60; index = 81; | Duplicate declaration. | JavaScript |
int[] data = new int[85];
data[85] = 5; | int[] data = new int[85];
if (85 < data.length) data[85] = 5; | Check bounds. | Java |
.User {{ color: green; }} | .User {{ color: green; }} | Correct. | CSS |
{{"title":"result",}} | {{"title":"result"}} | Remove trailing comma. | JSON |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
List(86,58,42) | List(86,58,42) | Correct. | Scala |
String name = 'output'; | String name = 'output'; | Correct. | Dart |
items[88] | if (length(items) >= 88) items[88] | Check length. | R |
while x > 58
x -= 1 | while x > 58:
x -= 1 | Colon missing after while. | Python |
UPDATE orders SET age='data' WHERE role=37 | UPDATE orders SET age='data' WHERE role=37; | Add semicolon. | SQL |
if index = 22 | if index == 22 | Use ==. | Ruby |
if count = 32 then
print('result')
end | if count == 32 then
print('result')
end | Use ==. | Lua |
<table><tr><td>data<td>data</tr></table> | <table><tr><td>data</td><td>data</td></tr></table> | Close td. | HTML |
44num = 10 | num44 = 10 | Variable cannot start with digit. | Python |
val foo = 81; foo = 27 | var foo = 81; foo = 27 | Use var for reassignment. | Scala |
class Order {{ int index; }}
obj.index=5; | class Order {{ public int index; }}
obj.index=5; | Make field public. | Java |
if c > 26
print('value') | if c > 26:
print('value') | Colon missing after if. | Python |
if [ $y = 15 ]; then | if [ "$y" = 15 ]; then | Quote variable. | Shell |
object Order {{ def main(args: Array[String]) = println("data") }} | object Order {{ def main(args: Array[String]): Unit = println("data") }} | Add return type Unit. | Scala |
JOIN profiles ON items.id = profiles.status | JOIN profiles ON items.id = profiles.status | Correct. | SQL |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
if ($c = 92) {{}} | if ($c -eq 92) {{}} | Use -eq. | PowerShell |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
function render(): void {{ return 86; }} | function render(): number {{ return 86; }} | Return type mismatch. | TypeScript |
const foo; | const foo = 49; | Initialize const. | JavaScript |
items.forEach(function(data) {{ console.log(data); }}) | items.forEach((data) => {{ console.log(data); }}) | Arrow functions are cleaner. | JavaScript |
let mut item=42; let ref1=&mut item; let ref2=&mut item; | let mut item=42; {{ let ref1=&mut item; }} let ref2=&mut item; | Only one mutable borrow. | Rust |
<img src='message.jpg'> | <img src='message.jpg' alt='desc'> | Add alt text. | HTML |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
function bar(count)
print(count)
end | function bar(count)
print(count)
end | Correct. | Lua |
local temp = 11 | local temp = 11 | Correct. | Lua |
let c = 24; c += 1; | let mut c = 24; c += 1; | Need mut to modify. | Rust |
[52, 51, 35 | [52, 51, 35] | Close bracket. | Ruby |
#main {{ color: red; }} | #main {{ color: red; }} | Correct. | CSS |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
print 'info' | print 'info'; | Add semicolon. | Perl |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
for (data in values) | for (data of values) | for...in iterates keys. | JavaScript |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
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