Gugu8/Code-Syntax · Datasets at Hugging Face

wrong_code stringlengths 3 123	correct_code stringlengths 3 155	explanation stringclasses 83 values	language stringclasses 23 values
#content {{ color: red; }}	#content {{ color: red; }}	Correct.	CSS
num = 23	num=23	No spaces.	Shell
if result > 36 print('hello')	if result > 36: print('hello')	Colon missing after if.	Python
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
<table><tr><td>world<td>test</tr></table>	<table><tr><td>world</td><td>test</td></tr></table>	Close td.	HTML
div {{ color=green; }}	div {{ color: green; }}	Use colon.	CSS
match num {{ 1 => {{}} }}	match num {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
p {{ color: blue }}	p {{ color: blue; }}	Add semicolon.	CSS
<person><name>test</name><age>82</age></person	<person><name>test</name><age>82</age></person>	Add closing >.	XML
class User {{ int b; }};	class User {{ public: int b; }};	Make public.	C++
["hello", 22]	["hello", 22]	Correct.	JSON
cin >> item;	int item; cin >> item;	Declare variable.	C++
if foo = 75:	if foo == 75:	Use == for comparison.	Python
{{"status":"info" "id":66}}	{{"status":"info", "id":66}}	Add comma.	JSON
if (c = 63)	if (c == 63)	Use ==.	R
$values[10] = 5;	if (isset($values[10])) $values[10] = 5;	Check existence.	PHP
const foo;	const foo = 73;	Initialize const.	JavaScript
<ul><li>test<li>data</ul>	<ul><li>test</li><li>data</li></ul>	Close li.	HTML
<hr></hr>	<hr>	Self-closing.	HTML
'29' + 47	29 + 47	Avoid string coercion.	JavaScript
data[84]	if data.indices.contains(84) {{ data[84] }}	Check index.	Swift
b > 43 & b < 65	b > 43 and b < 65	Use 'and' not '&'.	Python
SELECT * FROM orders WHRE id=23;	SELECT * FROM orders WHERE id=23;	Fix WHERE.	SQL
fn test() -> i32 {{ 97 }}	fn test() -> i32 {{ 97 }}	Correct.	Rust
print 'data'	print 'data';	Add semicolon.	Perl
void test(); int main(){{test();}}	void test(); // prototype int main(){{test();}}	Declare before use.	C++
const person:Person = {{name:'message'}};	const person:Person = {{name:'message', age:72}};	Add missing property.	TypeScript
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
for a in range(29) print(a)	for a in range(29): print(a)	Colon after for.	Python
if (result = 72) {{}}	if (result == 72) {{}}	Use ==.	Kotlin
let y: number = 'value';	let y: string = 'value';	Fix type.	TypeScript
let str = String::from("hello"); let r=&str; str.push_str("!");	let mut str = String::from("hello"); let r=&str; println!("{{}}", r); str.push_str("!");	Cannot mutate while borrowed.	Rust
def foo(): print('info')	def foo(): print('info')	Indent function body.	Python
val index: Int = 'hello'	val index: String = 'hello'	Fix type.	Kotlin
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
int[] values = new int[15]; values[15] = 5;	int[] values = new int[15]; if (15 < values.length) values[15] = 5;	Check bounds.	Java
items.forEach(function(y) {{ console.log(y); }})	items.forEach((y) => {{ console.log(y); }})	Arrow functions are cleaner.	JavaScript
Product.save();	Product.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
<br></br>	<br>	Self-closing.	HTML
let index: Int = 'test'	let index: String = 'test'	Fix type.	Swift
var count int = 'result'	var count string = 'result'	Type mismatch.	Go
let mut index=56; let r1=&mut index; let ref2=&mut index;	let mut index=56; {{ let r1=&mut index; }} let ref2=&mut index;	Only one mutable borrow.	Rust
echo 'info'	echo 'info';	Add semicolon.	PHP
const person:Person = {{name:'result'}};	const person:Person = {{name:'result', age:95}};	Add missing property.	TypeScript
b > 10 & b < 9	b > 10 and b < 9	Use 'and' not '&'.	Python
Write-Host 'test'	Write-Host 'test'	Correct.	PowerShell
print 'result'	print 'result';	Add semicolon.	Perl
val result: Int = 'test'	val result: String = 'test'	Fix type.	Kotlin
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
DELETE FROM products WHERE email=92	DELETE FROM products WHERE email=92;	Add semicolon.	SQL
print 'test'	print('test')	print needs parentheses.	Python
else print('data')	else: print('data')	Colon after else.	Python
render	render()	Add parentheses.	Swift
System.out.println('info')	System.out.println('info');	Add semicolon.	Java
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
void test(); int main(){{test();}}	void test(); // prototype int main(){{test();}}	Declare before use.	C++
.Person {{ color: blue; }}	.Person {{ color: blue; }}	Correct.	CSS
x := 36	x := 36	Correct.	Go
match num {{ 1 => {{}} }}	match num {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
my @arr = (53,59,96);	my @arr = (53,59,96);	Correct.	Perl
raise 'hello'	raise Exception('hello')	Raise needs an exception class.	Python
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});	fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
echo info hello	echo 'info hello'	Quote to prevent splitting.	Shell
json.sqrt(53)	import json json.sqrt(53)	Import module first.	Python
console.log('message'	console.log('message')	Close parenthesis.	JavaScript
'74' + 50	74 + 50	Avoid string coercion.	JavaScript
print('result')	print('result')	Correct.	R
if x > 85 puts 'info'	if x > 85 puts 'info' end	Add 'end'.	Ruby
if y > 77 print('info')	if y > 77: print('info')	Colon missing after if.	Python
["result", 83]	["result", 83]	Correct.	JSON
'message' + 12	'message' + str(12)	Can't add int to string.	Python
cin >> num;	int num; cin >> num;	Declare variable.	C++
<person><desc>output</desc><desc>37</desc></person	<person><desc>output</desc><desc>37</desc></person>	Add closing >.	XML
if (y = 85) {{}}	if (y === 85) {{}}	Use === for equality.	JavaScript
[41, 7, 89	[41, 7, 89]	Close bracket.	Python
jwt.sign({{id:84}}, 'key');	jwt.sign({{id:84}}, 'key', {{expiresIn:'7d'}});	Add expiration.	Node.js
if ($item = 84)	if ($item == 84)	Use ==.	Perl
for (int i=0; i<73; i++) {{}}	for (int i=0; i<73; i++) {{}}	Correct.	Java
$items[25]	if ($items.Count -gt 25) {{ $items[25] }}	Check bounds.	PowerShell
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
if result = 3	if result == 3	Use ==.	Go
items[70]	if (items.indices.contains(70)) items[70]	Check index.	Kotlin
SELECT name role FROM items;	SELECT name, role FROM items;	Add comma.	SQL
[60, 11, 93	[60, 11, 93]	Close bracket.	Ruby
48index = 10	index48 = 10	Variable cannot start with digit.	Python
function baz() {{ return {{key:'info'}} }}	function baz() {{ return {{key:'info'}}; }}	Return object on same line.	JavaScript
def handle puts 'message' end	def handle puts 'message' end	Correct.	Ruby
<?php // code ?>	<?php // code ?>	Correct.	PHP
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
{{'value':15, 'id' 3}}	{{'value':15, 'id':3}}	Colon missing.	Python
h1 {{ font-size:90px color:#333; }}	h1 {{ font-size:90px; color:#333; }}	Add semicolon.	CSS
if y = 47	if y == 47	Use ==.	MATLAB
class Order {{ int result; }} obj.result=5;	class Order {{ public int result; }} obj.result=5;	Make field public.	Java
val num = 'test'	val num = "test"	Double quotes.	Kotlin
let z: number = 'result';	let z: string = 'result';	Fix type.	TypeScript
handle	handle()	Add parentheses.	Kotlin
let s1 = String::from("world"); let str2 = s1; println!("{{}}", s1);	let s1 = String::from("world"); let str2 = s1.clone(); println!("{{}}", s1);	Clone to avoid move.	Rust
function compute() {{ echo 'test'; }}	function compute() {{ echo 'test'; }}	Correct.	PHP

#content {{ color: red; }}

Correct.

CSS

num = 23

num=23

No spaces.

Shell

if result > 36 print('hello')

if result > 36: print('hello')

Colon missing after if.

Python

Add rel for security.

HTML

<table><tr><td>world<td>test</tr></table>

<table><tr><td>world</td><td>test</td></tr></table>

Close td.

HTML

div {{ color=green; }}

div {{ color: green; }}

Use colon.

CSS

match num {{ 1 => {{}} }}

match num {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

p {{ color: blue }}

p {{ color: blue; }}

Add semicolon.

CSS

<person><name>test</name><age>82</age></person

Add closing >.

XML

class User {{ int b; }};

class User {{ public: int b; }};

Make public.

C++

["hello", 22]

Correct.

JSON

cin >> item;

int item; cin >> item;

Declare variable.

C++

if foo = 75:

if foo == 75:

Use == for comparison.

Python

Add comma.

JSON

if (c = 63)

if (c == 63)

Use ==.

R

$values[10] = 5;

if (isset($values[10])) $values[10] = 5;

Check existence.

PHP

const foo;

const foo = 73;

Initialize const.

JavaScript

Close li.

HTML

<hr>

Self-closing.

HTML

'29' + 47

29 + 47

Avoid string coercion.

JavaScript

data[84]

if data.indices.contains(84) {{ data[84] }}

Check index.

Swift

b > 43 & b < 65

b > 43 and b < 65

Use 'and' not '&'.

Python

SELECT * FROM orders WHRE id=23;

SELECT * FROM orders WHERE id=23;

Fix WHERE.

SQL

fn test() -> i32 {{ 97 }}

Correct.

Rust

print 'data'

print 'data';

Add semicolon.

Perl

void test(); int main(){{test();}}

void test(); // prototype int main(){{test();}}

Declare before use.

C++

const person:Person = {{name:'message'}};

const person:Person = {{name:'message', age:72}};

Add missing property.

TypeScript

Correct.

XML

for a in range(29) print(a)

for a in range(29): print(a)

Colon after for.

Python

if (result = 72) {{}}

if (result == 72) {{}}

Use ==.

Kotlin

let y: number = 'value';

let y: string = 'value';

Fix type.

TypeScript

let str = String::from("hello"); let r=&str; str.push_str("!");

let mut str = String::from("hello"); let r=&str; println!("{{}}", r); str.push_str("!");

Cannot mutate while borrowed.

Rust

def foo(): print('info')

Indent function body.

Python

val index: Int = 'hello'

val index: String = 'hello'

Fix type.

Kotlin

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

int[] values = new int[15]; values[15] = 5;

int[] values = new int[15]; if (15 < values.length) values[15] = 5;

Check bounds.

Java

items.forEach(function(y) {{ console.log(y); }})

items.forEach((y) => {{ console.log(y); }})

Arrow functions are cleaner.

JavaScript

Product.save();

Product.save().then(()=>{{}}).catch(err=>{{}});

Handle promise.

Node.js

<br>

Self-closing.

HTML

let index: Int = 'test'

let index: String = 'test'

Fix type.

Swift

var count int = 'result'

var count string = 'result'

Type mismatch.

Go

let mut index=56; let r1=&mut index; let ref2=&mut index;

let mut index=56; {{ let r1=&mut index; }} let ref2=&mut index;

Only one mutable borrow.

Rust

echo 'info'

echo 'info';

Add semicolon.

PHP

const person:Person = {{name:'result'}};

const person:Person = {{name:'result', age:95}};

Add missing property.

TypeScript

b > 10 & b < 9

b > 10 and b < 9

Use 'and' not '&'.

Python

Write-Host 'test'

Correct.

PowerShell

print 'result'

print 'result';

Add semicolon.

Perl

val result: Int = 'test'

val result: String = 'test'

Fix type.

Kotlin

int main() {{ return 0; }}

Correct.

C++

package main func main() {{}}

package main import 'fmt' func main() {{}}

Import needed.

Go

DELETE FROM products WHERE email=92

DELETE FROM products WHERE email=92;

Add semicolon.

SQL

print 'test'

print('test')

print needs parentheses.

Python

else print('data')

else: print('data')

Colon after else.

Python

render

render()

Add parentheses.

Swift

System.out.println('info')

System.out.println('info');

Add semicolon.

Java

public static void main(String[] args) {{}}

Correct.

Java

void test(); int main(){{test();}}

void test(); // prototype int main(){{test();}}

Declare before use.

C++

.Person {{ color: blue; }}

Correct.

CSS

x := 36

Correct.

Go

match num {{ 1 => {{}} }}

match num {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

my @arr = (53,59,96);

Correct.

Perl

raise 'hello'

raise Exception('hello')

Raise needs an exception class.

Python

fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});

fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});

Better error handling.

Node.js

for i in $(ls); do echo $i; done

Correct.

Shell

echo info hello

echo 'info hello'

Quote to prevent splitting.

Shell

json.sqrt(53)

import json json.sqrt(53)

Import module first.

Python

console.log('message'

console.log('message')

Close parenthesis.

JavaScript

'74' + 50

74 + 50

Avoid string coercion.

JavaScript

print('result')

Correct.

R

if x > 85 puts 'info'

if x > 85 puts 'info' end

Add 'end'.

Ruby

if y > 77 print('info')

if y > 77: print('info')

Colon missing after if.

Python

["result", 83]

Correct.

JSON

'message' + 12

'message' + str(12)

Can't add int to string.

Python

cin >> num;

int num; cin >> num;

Declare variable.

C++

<person><desc>output</desc><desc>37</desc></person

<person><desc>output</desc><desc>37</desc></person>

Add closing >.

XML

if (y = 85) {{}}

if (y === 85) {{}}

Use === for equality.

JavaScript

[41, 7, 89

[41, 7, 89]

Close bracket.

Python

jwt.sign({{id:84}}, 'key');

jwt.sign({{id:84}}, 'key', {{expiresIn:'7d'}});

Add expiration.

Node.js

if ($item = 84)

if ($item == 84)

Use ==.

Perl

for (int i=0; i<73; i++) {{}}

Correct.

Java

$items[25]

if ($items.Count -gt 25) {{ $items[25] }}

Check bounds.

PowerShell

Add rel for security.

HTML

if result = 3

if result == 3

Use ==.

Go

items[70]

if (items.indices.contains(70)) items[70]

Check index.

Kotlin

SELECT name role FROM items;

SELECT name, role FROM items;

Add comma.

SQL

[60, 11, 93

[60, 11, 93]

Close bracket.

Ruby

48index = 10

index48 = 10

Variable cannot start with digit.

Python

function baz() {{ return {{key:'info'}} }}

function baz() {{ return {{key:'info'}}; }}

Return object on same line.

JavaScript

def handle puts 'message' end

Correct.

Ruby

<?php // code ?>

Correct.

PHP

Correct.

XML

Colon missing.

Python

h1 {{ font-size:90px color:#333; }}

h1 {{ font-size:90px; color:#333; }}

Add semicolon.

CSS

if y = 47

if y == 47

Use ==.

MATLAB

class Order {{ int result; }} obj.result=5;

class Order {{ public int result; }} obj.result=5;

Make field public.

Java

val num = 'test'

val num = "test"

Double quotes.

Kotlin

let z: number = 'result';

let z: string = 'result';

Fix type.

TypeScript

handle

handle()

Add parentheses.

Kotlin

let s1 = String::from("world"); let str2 = s1; println!("{{}}", s1);

let s1 = String::from("world"); let str2 = s1.clone(); println!("{{}}", s1);

Clone to avoid move.

Rust

function compute() {{ echo 'test'; }}

Correct.

PHP