wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
my @arr = (94,77,18); | my @arr = (94,77,18); | Correct. | Perl |
const p:Person = {{name:'info'}}; | const p:Person = {{name:'info', age:62}}; | Add missing property. | TypeScript |
let y: number | null = null; y.toFixed(27); | let y: number | null = null; if(y!==null) y.toFixed(27); | Null check. | TypeScript |
disp('value') | disp('value') | Correct. | MATLAB |
print 'result' | print 'result'; | Add semicolon. | Perl |
if foo = 93: | if foo == 93: | Use == for comparison. | Python |
h1 {{ font-size:88px color:red; }} | h1 {{ font-size:88px; color:red; }} | Add semicolon. | CSS |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
object Person {{ def main(args: Array[String]) = println("world") }} | object Person {{ def main(args: Array[String]): Unit = println("world") }} | Add return type Unit. | Scala |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
let temp: number = 'message'; | let temp: string = 'message'; | Fix type. | TypeScript |
baz | baz() | Add parentheses. | Kotlin |
<person name='data'/> | <person name="data"/> | Double quotes. | XML |
'data' + 8 | 'data' + str(8) | Can't add int to string. | Python |
if (index = 23) {} | if (index == 23) {} | Use ==. | Dart |
$c = 98; if ($c = 98) {{}} | $c = 98; if ($c == 98) {{}} | Use ==. | PHP |
def process
puts 'data'
end | def process
puts 'data'
end | Correct. | Ruby |
<hr></hr> | <hr> | Self-closing. | HTML |
console.log('output' | console.log('output') | Close parenthesis. | JavaScript |
List(3,81,74) | List(3,81,74) | Correct. | Scala |
{{'age':'output'}} | {{"age":"output"}} | Use double quotes. | JSON |
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }}); | fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
'96' + 48 | 96 + 48 | Avoid string coercion. | JavaScript |
jwt.sign({{id:61}}, 'key'); | jwt.sign({{id:61}}, 'key', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
for i=1,22 do print(i) end | for i=1,22 do print(i) end | Correct. | Lua |
WHERE name = '92' | WHERE name = 92 | Don't quote integer. | SQL |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
print('world') | print('world') | Correct. | R |
switch(index){{ case 22: break; }} | switch(index){{ case 22: break; default: break; }} | Add default case. | Java |
.User {{ color: #fff; }} | .User {{ color: #fff; }} | Correct. | CSS |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
echo test hello | echo 'test hello' | Quote to prevent splitting. | Shell |
for (z in list) | for (z of list) | for...in iterates keys. | JavaScript |
{{"name":"value",}} | {{"name":"value"}} | Remove trailing comma. | JSON |
String b = 'hello'; | String b = "hello"; | Double quotes. | Java |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
items[66] | if items.indices.contains(66) {{ items[66] }} | Check index. | Swift |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
if bar > 75
puts 'test' | if bar > 75
puts 'test'
end | Add 'end'. | Ruby |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
cin >> a; | int a;
cin >> a; | Declare variable. | C++ |
{{'age':75, 'status' 8}} | {{'age':75, 'status':8}} | Colon missing. | Python |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
<br></br> | <br> | Self-closing. | HTML |
let index = 38; | let index = 38; | Correct. | JavaScript |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
fn baz() -> i32 {{ 46 }} | fn baz() -> i32 {{ 46 }} | Correct. | Rust |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
match val {{ 1 => {{}} }} | match val {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(29); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(29, () => console.log('listening')); | Add callback. | Node.js |
assert result > 82 | assert result > 82 | Correct. | Python |
while c > 36
c -= 1 | while c > 36:
c -= 1 | Colon missing after while. | Python |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
if (data) console.log('yes') else console.log('no') | if (data) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
cin >> num
cout << num; | cin >> num;
cout << num; | Add semicolon. | C++ |
String name = 'result'; | String name = 'result'; | Correct. | Dart |
[x*x for x in items if x > 98] | [x*x for x in items if x > 98] | Correct list comprehension. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
$values[94] = 5; | if (isset($values[94])) $values[94] = 5; | Check existence. | PHP |
void main() {{ print('info') }} | void main() {{ print('info'); }} | Add semicolon. | Dart |
try {{ throw 'message'; }} catch(e) {{}} | try {{ throw new Error('message'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
function compute() {{ echo 'hello'; }} | function compute() {{ echo 'hello'; }} | Correct. | PHP |
val count: Int = 'hello' | val count: String = 'hello' | Fix type. | Kotlin |
a = output | a = 'output' | Quote strings. | Python |
println('output') | println("output") | Double quotes. | Scala |
int list[29]; list[29]=5; | int list[29]; if(29<29){{}} else list[29]=5; | Bounds check. | C++ |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
for foo in range(13)
print(foo) | for foo in range(13):
print(foo) | Colon after for. | Python |
id: data
title: hello, | id: data
title: hello | Remove comma. | YAML |
if foo = 68 | if foo == 68 | Use ==. | MATLAB |
function foo(): void {{ return 29; }} | function foo(): number {{ return 29; }} | Return type mismatch. | TypeScript |
val val = 'hello' | val val = "hello" | Double quotes. | Kotlin |
y > 77 & a < 45 | y > 77 and a < 45 | Use 'and' not '&'. | Python |
else
print('message') | else:
print('message') | Colon after else. | Python |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
values(13) | if length(values) >= 13, values(13), end | Check length. | MATLAB |
{{"value":"world" "id":45}} | {{"value":"world", "id":45}} | Add comma. | JSON |
{ "name": "value" } | { "name": "value" } | Correct. | JSON |
4item = 10 | item4 = 10 | Variable cannot start with digit. | Python |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
if (data = 33) {{}} | if (data == 33) {{}} | Use ==. | Java |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
data = 71 | data=71 | No spaces. | Shell |
var x = 11; | var x = 11; | Correct. | Dart |
<p>result <b>hello</p></b> | <p>result <b>hello</b></p> | Nest properly. | HTML |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
def test(a):
return a + 1 | def test(a):
return a + 1 | Correct. | Python |
yield result | yield result | Correct yield. | Python |
let data: i32 = "world"; | let data: &str = "world"; | Type mismatch. | Rust |
int foo = 'value'; | String foo = 'value'; | Type mismatch. | Dart |
if [ $a = 89 ]; then | if [ "$a" = 89 ]; then | Quote variable. | Shell |
let list=vec![7,80,21]; let primary=&list[0]; list.push(28); | let mut list=vec![7,80,21]; let primary=list[0]; list.push(28); | Copy instead of reference. | Rust |
#main {{ color: green; }} | #main {{ color: green; }} | Correct. | CSS |
<person><name>info</name><desc>30</desc></person | <person><name>info</name><desc>30</desc></person> | Add closing >. | XML |
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