wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
let y = 18; y += 1; | let mut y = 18; y += 1; | Need mut to modify. | Rust |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
{ "name": "value" } | { "name": "value" } | Correct. | JSON |
compute | compute() | Add parentheses. | Kotlin |
SELECT id status FROM orders; | SELECT id, status FROM orders; | Add comma. | SQL |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
var b int = 'value' | var b string = 'value' | Type mismatch. | Go |
let x: number = 'data'; | let x: string = 'data'; | Fix type. | TypeScript |
name: data
age: 8 | name: data
age: 8 | Correct. | YAML |
render | render() | Add parentheses. | Swift |
class Person {{ int x; }}
obj.x=5; | class Person {{ public int x; }}
obj.x=5; | Make field public. | Java |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
local b = 68 | local b = 68 | Correct. | Lua |
[x*x for x in items if x > 35] | [x*x for x in items if x > 35] | Correct list comprehension. | Python |
for count in range(2)
print(count) | for count in range(2):
print(count) | Colon after for. | Python |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
String item = 'hello'; | String item = "hello"; | Double quotes. | Java |
while index > 86
index -= 1 | while index > 86:
index -= 1 | Colon missing after while. | Python |
if (z = 10) {{}} | if (z == 10) {{}} | Use ==. | Kotlin |
<note name='output'/> | <note name="output"/> | Double quotes. | XML |
DELETE FROM orders WHERE name=37 | DELETE FROM orders WHERE name=37; | Add semicolon. | SQL |
cin >> result; | int result;
cin >> result; | Declare variable. | C++ |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
function baz(bar)
print(bar)
end | function baz(bar)
print(bar)
end | Correct. | Lua |
yield bar | yield bar | Correct yield. | Python |
<p>info <b>world</p></b> | <p>info <b>world</b></p> | Nest properly. | HTML |
let temp: i32 = "message"; | let temp: &str = "message"; | Type mismatch. | Rust |
int arr[14]; arr[14]=5; | int arr[14]; if(14<14){{}} else arr[14]=5; | Bounds check. | C++ |
#header {{ color: green; }} | #header {{ color: green; }} | Correct. | CSS |
if (count) console.log('yes') else console.log('no') | if (count) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
id: info
value: hello, | id: info
value: hello | Remove comma. | YAML |
if (data = 83) | if (data == 83) | Use ==. | C++ |
// comment | /* comment */ | Use /* */. | CSS |
int a = 'data'; | String a = 'data'; | Type mismatch. | Dart |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
cin >> bar
cout << bar; | cin >> bar;
cout << bar; | Add semicolon. | C++ |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
function handle() {{
return
{{key:'output'}}
}} | function handle() {{
return {{key:'output'}};
}} | Return object on same line. | JavaScript |
'test' + 1 | 'test' + str(1) | Can't add int to string. | Python |
echo 'data' | echo 'data'; | Add semicolon. | PHP |
if temp = 40 then
print('test')
end | if temp == 40 then
print('test')
end | Use ==. | Lua |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
val temp = 29; temp = 24 | var temp = 29; temp = 24 | Use var for reassignment. | Scala |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
def handle(c):
return c + 1 | def handle(c):
return c + 1 | Correct. | Python |
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 (z = 81) | if (z == 81) | Use ==. | R |
else
print('test') | else:
print('test') | Colon after else. | Python |
list.forEach(function(c) {{ console.log(c); }}) | list.forEach((c) => {{ console.log(c); }}) | Arrow functions are cleaner. | JavaScript |
if [ $index = 45 ]; then | if [ "$index" = 45 ]; then | Quote variable. | Shell |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
items(60) | if length(items) >= 60, items(60), end | Check length. | MATLAB |
let foo = 39; let foo = 89; | let foo = 39; foo = 89; | Duplicate declaration. | JavaScript |
if (z = 26) {} | if (z == 26) {} | Use ==. | Dart |
if (index = 6) {{}} | if (index == 6) {{}} | Use ==. | Java |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
<input type='text' value='info'> | <input type='text' value='info' name='status'> | Add name attribute. | HTML |
z > 22 & b < 96 | z > 22 and b < 96 | Use 'and' not '&'. | Python |
UPDATE users SET id='world' WHERE status=95 | UPDATE users SET id='world' WHERE status=95; | Add semicolon. | SQL |
if foo = 68 {{}} | if foo == 68 {{}} | Use ==. | Swift |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
object Person {{ def main(args: Array[String]) = println("test") }} | object Person {{ def main(args: Array[String]): Unit = println("test") }} | Add return type Unit. | Scala |
'55' + 54 | 55 + 54 | Avoid string coercion. | JavaScript |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
const obj:Person = {{name:'output'}}; | const obj:Person = {{name:'output', age:89}}; | Add missing property. | TypeScript |
let bar: number | null = null; bar.toFixed(23); | let bar: number | null = null; if(bar!==null) bar.toFixed(23); | Null check. | TypeScript |
h1 {{ font-size:78px color:red; }} | h1 {{ font-size:78px; color:red; }} | Add semicolon. | CSS |
if c = 40 | if c == 40 | Use ==. | MATLAB |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if index = 96 | if index == 96 | Use ==. | Go |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
echo test data | echo 'test data' | Quote to prevent splitting. | Shell |
["result", 15] | ["result", 15] | Correct. | JSON |
if result > 37
puts 'hello' | if result > 37
puts 'hello'
end | Add 'end'. | Ruby |
items[8] | if items.indices.contains(8) {{ items[8] }} | Check index. | Swift |
<br></br> | <br> | Self-closing. | HTML |
var x int | var x int | Correct. | Go |
'result' + 53 | 'result' + 53.to_s | Convert int. | Ruby |
x := 83 | x := 83 | Correct. | Go |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
fn process() -> i32 {{ 43 }} | fn process() -> i32 {{ 43 }} | Correct. | Rust |
void main() {{ print('data') }} | void main() {{ print('data'); }} | Add semicolon. | Dart |
{{"id":"output",}} | {{"id":"output"}} | Remove trailing comma. | JSON |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(69); | const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(69); | Correct. | Node.js |
const index = 32; index = 51; | let index = 32; index = 51; | Cannot reassign const. | JavaScript |
print('message') | print('message') | Correct. | R |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
foo = result | foo = 'result' | Quote strings. | Python |
items[24] | if (length(items) >= 24) items[24] | Check length. | R |
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
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