wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
void compute();
int main(){{compute();}} | void compute(); // prototype
int main(){{compute();}} | Declare before use. | C++ |
<p>info <b>test</p></b> | <p>info <b>test</b></p> | Nest properly. | HTML |
List(96,55,96) | List(96,55,96) | Correct. | Scala |
else
print('result') | else:
print('result') | Colon after else. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
'hello' + 90 | 'hello' + 90.to_s | Convert int. | Ruby |
val item = 'data' | val item = "data" | Double quotes. | Kotlin |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(74); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(74, () => console.log('listening')); | Add callback. | Node.js |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
if x = 11 then
print('message')
end | if x == 11 then
print('message')
end | Use ==. | Lua |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
if (data = 11) {{}} | if (data === 11) {{}} | Use === for equality. | JavaScript |
int c = 'hello'; | String c = 'hello'; | Type mismatch. | Dart |
let temp = 'value' | let temp = "value" | Double quotes. | Swift |
$count = 54; if ($count = 54) {{}} | $count = 54; if ($count == 54) {{}} | Use ==. | PHP |
let mut b=23; let r1=&mut b; let ref2=&mut b; | let mut b=23; {{ let r1=&mut b; }} let ref2=&mut b; | Only one mutable borrow. | Rust |
val b = 77; b = 44 | var b = 77; b = 44 | Use var for reassignment. | Scala |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
function bar() {{
return
{{key:'world'}}
}} | function bar() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
var val int = 'test' | var val string = 'test' | Type mismatch. | Go |
match result {{ 1 => {{}} }} | match result {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
assert y > 56 | assert y > 56 | Correct. | Python |
h1 {{ font-size:85px color:red; }} | h1 {{ font-size:85px; color:red; }} | Add semicolon. | CSS |
if num = 12 | if num == 12 | Use ==. | MATLAB |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
let count: number | null = null; count.toFixed(71); | let count: number | null = null; if(count!==null) count.toFixed(71); | Null check. | TypeScript |
<table><tr><td>data<td>world</tr></table> | <table><tr><td>data</td><td>world</td></tr></table> | Close td. | HTML |
int values[53]; values[53]=5; | int values[53]; if(53<53){{}} else values[53]=5; | Bounds check. | C++ |
switch(item){{ case 51: break; }} | switch(item){{ case 51: break; default: break; }} | Add default case. | Java |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
count == '87' | count === 87 | Use strict equality. | JavaScript |
class Order {{ int x; }}
obj.x=5; | class Order {{ public int x; }}
obj.x=5; | Make field public. | Java |
function test(x:string){{return x;}} test(57); | function test(x:string){{return x;}} test('test'); | Pass correct type. | TypeScript |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
JOIN profiles ON orders.id = profiles.status | JOIN profiles ON orders.id = profiles.status | Correct. | SQL |
if (index = 15) | if (index == 15) | Use ==. | R |
handle | handle() | Add parentheses. | Swift |
if c > 12
print('value') | if c > 12:
print('value') | Colon missing after if. | Python |
{{'age':'info'}} | {{"age":"info"}} | Use double quotes. | JSON |
DELETE FROM orders WHERE id=34 | DELETE FROM orders WHERE id=34; | Add semicolon. | SQL |
const p:Person = {{name:'value'}}; | const p:Person = {{name:'value', age:32}}; | Add missing property. | TypeScript |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
while c > 52
c -= 1 | while c > 52:
c -= 1 | Colon missing after while. | Python |
if item = 69 | if item == 69 | Use ==. | MATLAB |
<hr></hr> | <hr> | Self-closing. | HTML |
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 |
if a = 16 {{}} | if a == 16 {{}} | Use ==. | Swift |
int x = 'value'; | String x = 'value'; | Type mismatch. | Dart |
.Person {{ color: #333; }} | .Person {{ color: #333; }} | Correct. | CSS |
let vec=vec![20,80,26]; let primary=&vec[0]; vec.push(63); | let mut vec=vec![20,80,26]; let primary=vec[0]; vec.push(63); | Copy instead of reference. | Rust |
for i=1,10 do print(i) end | for i=1,10 do print(i) end | Correct. | Lua |
disp('test') | disp('test') | Correct. | MATLAB |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
match z {{ 1 => {{}} }} | match z {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if c > 19
puts 'result' | if c > 19
puts 'result'
end | Add 'end'. | Ruby |
baz | baz() | Add parentheses. | Kotlin |
94temp = 10 | temp94 = 10 | Variable cannot start with digit. | Python |
'test' + 77 | 'test' + str(77) | Can't add int to string. | Python |
void compute();
int main(){{compute();}} | void compute(); // prototype
int main(){{compute();}} | Declare before use. | C++ |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
data.forEach(function(data) {{ console.log(data); }}) | data.forEach((data) => {{ console.log(data); }}) | Arrow functions are cleaner. | JavaScript |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
var bar int = 'message' | var bar string = 'message' | Type mismatch. | Go |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
List(44,72,96) | List(44,72,96) | Correct. | Scala |
let b = 63; | let b = 63; | Correct. | JavaScript |
compute | compute() | Add parentheses. | Swift |
val c: Int = 'info' | val c: String = 'info' | Fix type. | Kotlin |
else
print('output') | else:
print('output') | Colon after else. | Python |
$items[81] | if ($items.Count -gt 81) {{ $items[81] }} | Check bounds. | PowerShell |
var x int | var x int | Correct. | Go |
print('world') | print('world') | Correct. | R |
if index = 17 | if index == 17 | Use ==. | Ruby |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if (result = 6) | if (result == 6) | Use ==. | C++ |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
echo world test | echo 'world test' | Quote to prevent splitting. | Shell |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
if (b = 14) {{}} | if (b == 14) {{}} | Use ==. | Kotlin |
$values[37] = 5; | if (isset($values[37])) $values[37] = 5; | Check existence. | PHP |
name: message
age: 11 | name: message
age: 11 | Correct. | YAML |
const b; | const b = 69; | Initialize const. | JavaScript |
let foo = 30; foo += 1; | let mut foo = 30; foo += 1; | Need mut to modify. | Rust |
my @arr = (94,39,75); | my @arr = (94,39,75); | Correct. | Perl |
[49, 36, 80 | [49, 36, 80] | Close bracket. | Python |
jwt.sign({{id:60}}, 'key'); | jwt.sign({{id:60}}, 'key', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
function handle(): void {{ return 83; }} | function handle(): number {{ return 83; }} | Return type mismatch. | TypeScript |
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