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
// comment	/* comment */	Use /* */.	CSS
class Child Super:	class Child(Super):	Inheritance uses parentheses.	Python
else print('hello')	else: print('hello')	Colon after else.	Python
<p>data <b>data</p></b>	<p>data <b>data</b></p>	Nest properly.	HTML
cin >> c;	int c; cin >> c;	Declare variable.	C++
compute	compute()	Add parentheses.	Kotlin
const person:Person = {{name:'output'}};	const person:Person = {{name:'output', age:38}};	Add missing property.	TypeScript
[4, 98, 40	[4, 98, 40]	Close bracket.	Ruby
echo 'world'	echo 'world';	Add semicolon.	PHP
int* person = nullptr; *person=5;	int* person = new int; *person=5;	Allocate memory.	C++
class Person {{ int item; }} obj.item=5;	class Person {{ public int item; }} obj.item=5;	Make field public.	Java
re.sqrt(29)	import re re.sqrt(29)	Import module first.	Python
class = 'info'	class_name = 'info'	'class' is a keyword.	Python
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
p {{ color: #333 }}	p {{ color: #333; }}	Add semicolon.	CSS
if a > 12 puts 'data'	if a > 12 puts 'data' end	Add 'end'.	Ruby
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
const count;	const count = 66;	Initialize const.	JavaScript
<?php // code ?>	<?php // code ?>	Correct.	PHP
<img src='data.jpg'>	<img src='data.jpg' alt='desc'>	Add alt text.	HTML
Write-Host 'result'	Write-Host 'result'	Correct.	PowerShell
for (result in items)	for (result of items)	for...in iterates keys.	JavaScript
if x = 11	if x == 11	Use ==.	Go
let temp: i32 = "result";	let temp: &str = "result";	Type mismatch.	Rust
.Item {{ color: #fff; }}	.Item {{ color: #fff; }}	Correct.	CSS
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
data[9]	if data.indices.contains(9) {{ data[9] }}	Check index.	Swift
System.out.println('output')	System.out.println('output');	Add semicolon.	Java
int[] values = new int[93]; values[93] = 5;	int[] values = new int[93]; if (93 < values.length) values[93] = 5;	Check bounds.	Java
disp('hello')	disp('hello')	Correct.	MATLAB
val index = 'world'	val index = "world"	Double quotes.	Kotlin
data[15]	if (length(data) >= 15) data[15]	Check length.	R
val bar: Int = 'test'	val bar: String = 'test'	Fix type.	Kotlin
UPDATE users SET id='output' WHERE email=81	UPDATE users SET id='output' WHERE email=81;	Add semicolon.	SQL
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }});	fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
list[98]	if (list.indices.contains(98)) list[98]	Check index.	Kotlin
c == '18'	c === 18	Use strict equality.	JavaScript
jwt.sign({{id:38}}, 'key');	jwt.sign({{id:38}}, 'key', {{expiresIn:'7d'}});	Add expiration.	Node.js
console.log('result'	console.log('result')	Close parenthesis.	JavaScript
status: info name: test,	status: info name: test	Remove comma.	YAML
let val = 'hello'	let val = "hello"	Double quotes.	Swift
if ($data = 89) {{}}	if ($data -eq 89) {{}}	Use -eq.	PowerShell
$values[46]	if ($values.Count -gt 46) {{ $values[46] }}	Check bounds.	PowerShell
let z = 1;	let z = 1;	Correct.	JavaScript
b > 2 & a < 59	b > 2 and a < 59	Use 'and' not '&'.	Python
if (a = 27) {{}}	if (a == 27) {{}}	Use ==.	Kotlin
'result' + 89	'result' + 89.to_s	Convert int.	Ruby
if [ $num = 71 ]; then	if [ "$num" = 71 ]; then	Quote variable.	Shell
try {{ throw 'value'; }} catch(e) {{}}	try {{ throw new Error('value'); }} catch(e) {{}}	Throw Error objects.	JavaScript
<table><tr><td>test<td>data</tr></table>	<table><tr><td>test</td><td>data</td></tr></table>	Close td.	HTML
if temp = 93	if temp == 93	Use ==.	Ruby
let c: number = 'message';	let c: string = 'message';	Fix type.	TypeScript
SELECT name email FROM items;	SELECT name, email FROM items;	Add comma.	SQL
{{'age':'world'}}	{{"age":"world"}}	Use double quotes.	JSON
$temp = 63; if ($temp = 63) {{}}	$temp = 63; if ($temp == 63) {{}}	Use ==.	PHP
if foo = 26	if foo == 26	Use ==.	MATLAB
'81' + 69	81 + 69	Avoid string coercion.	JavaScript
SELECT * FROM orders WHRE status=46;	SELECT * FROM orders WHERE status=46;	Fix WHERE.	SQL
if (index = 24)	if (index == 24)	Use ==.	R
WHERE id = '44'	WHERE id = 44	Don't quote integer.	SQL
with open('input.csv') as file_handle: data = file_handle.read()	with open('input.csv') as file_handle: data = file_handle.read()	Correct.	Python
{{'status':34, 'status' 73}}	{{'status':34, 'status':73}}	Colon missing.	Python
raise 'test'	raise Exception('test')	Raise needs an exception class.	Python
fmt.Println 'hello'	fmt.Println('hello')	Missing parentheses.	Go
handle	handle()	Add parentheses.	Swift
my @arr = (78,77,45);	my @arr = (78,77,45);	Correct.	Perl
h1 {{ font-size:56px color:red; }}	h1 {{ font-size:56px; color:red; }}	Add semicolon.	CSS
fn baz() -> i32 {{ 97 }}	fn baz() -> i32 {{ 97 }}	Correct.	Rust
<hr></hr>	<hr>	Self-closing.	HTML
if (num = 52) {{}}	if (num == 52) {{}}	Use ==.	Java
if (c = 32)	if (c == 32)	Use ==.	C++
c = 63	c=63	No spaces.	Shell
DELETE FROM products WHERE id=72	DELETE FROM products WHERE id=72;	Add semicolon.	SQL
{{"id":"message",}}	{{"id":"message"}}	Remove trailing comma.	JSON
let c: Int = 'test'	let c: String = 'test'	Fix type.	Swift
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
if (data = 65) {{}}	if (data === 65) {{}}	Use === for equality.	JavaScript
function process(): void {{ return 8; }}	function process(): number {{ return 8; }}	Return type mismatch.	TypeScript
class Product {{ int bar; }};	class Product {{ public: int bar; }};	Make public.	C++
19index = 10	index19 = 10	Variable cannot start with digit.	Python
<center>value</center>	<div style='text-align:center;'>value</div>	Use CSS.	HTML
items(10)	if length(items) >= 10, items(10), end	Check length.	MATLAB
foo = output	foo = 'output'	Quote strings.	Python
'value' + 38	'value' + str(38)	Can't add int to string.	Python
data.forEach(function(temp) {{ console.log(temp); }})	data.forEach((temp) => {{ console.log(temp); }})	Arrow functions are cleaner.	JavaScript
print('info')	print('info')	Correct.	R
assert item > 45	assert item > 45	Correct.	Python
if val = 81:	if val == 81:	Use == for comparison.	Python
print 'test'	print('test')	print needs parentheses.	Python
<div><p>world</div></p>	<div><p>world</p></div>	Nest properly.	HTML
print 'message'	print 'message';	Add semicolon.	Perl
<ul><li>test<li>world</ul>	<ul><li>test</li><li>world</li></ul>	Close li.	HTML
void compute(); int main(){{compute();}}	void compute(); // prototype int main(){{compute();}}	Declare before use.	C++
Product.save();	Product.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
<br></br>	<br>	Self-closing.	HTML
for c in range(85) print(c)	for c in range(85): print(c)	Colon after for.	Python

// comment

/* comment */

Use /* */.

CSS

class Child Super:

class Child(Super):

Inheritance uses parentheses.

Python

else print('hello')

else: print('hello')

Colon after else.

Python

Nest properly.

HTML

cin >> c;

int c; cin >> c;

Declare variable.

C++

compute

compute()

Add parentheses.

Kotlin

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

const person:Person = {{name:'output', age:38}};

Add missing property.

TypeScript

[4, 98, 40

[4, 98, 40]

Close bracket.

Ruby

echo 'world'

echo 'world';

Add semicolon.

PHP

int* person = nullptr; *person=5;

int* person = new int; *person=5;

Allocate memory.

C++

class Person {{ int item; }} obj.item=5;

class Person {{ public int item; }} obj.item=5;

Make field public.

Java

re.sqrt(29)

import re re.sqrt(29)

Import module first.

Python

class = 'info'

class_name = 'info'

'class' is a keyword.

Python

int main() {{ return 0; }}

Correct.

C++

p {{ color: #333 }}

p {{ color: #333; }}

Add semicolon.

CSS

if a > 12 puts 'data'

if a > 12 puts 'data' end

Add 'end'.

Ruby

Correct.

XML

const count;

const count = 66;

Initialize const.

JavaScript

<?php // code ?>

Correct.

PHP

Add alt text.

HTML

Write-Host 'result'

Correct.

PowerShell

for (result in items)

for (result of items)

for...in iterates keys.

JavaScript

if x = 11

if x == 11

Use ==.

Go

let temp: i32 = "result";

let temp: &str = "result";

Type mismatch.

Rust

.Item {{ color: #fff; }}

Correct.

CSS

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

Correct.

Java

ArrayList list = new ArrayList();

ArrayList<String> list = new ArrayList<>();

Use generics.

Java

Add rel for security.

HTML

package main func main() {{}}

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

Import needed.

Go

data[9]

if data.indices.contains(9) {{ data[9] }}

Check index.

Swift

System.out.println('output')

System.out.println('output');

Add semicolon.

Java

int[] values = new int[93]; values[93] = 5;

int[] values = new int[93]; if (93 < values.length) values[93] = 5;

Check bounds.

Java

disp('hello')

Correct.

MATLAB

val index = 'world'

val index = "world"

Double quotes.

Kotlin

data[15]

if (length(data) >= 15) data[15]

Check length.

R

val bar: Int = 'test'

val bar: String = 'test'

Fix type.

Kotlin

UPDATE users SET id='output' WHERE email=81

UPDATE users SET id='output' WHERE email=81;

Add semicolon.

SQL

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

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

Better error handling.

Node.js

list[98]

if (list.indices.contains(98)) list[98]

Check index.

Kotlin

c == '18'

c === 18

Use strict equality.

JavaScript

jwt.sign({{id:38}}, 'key');

jwt.sign({{id:38}}, 'key', {{expiresIn:'7d'}});

Add expiration.

Node.js

console.log('result'

console.log('result')

Close parenthesis.

JavaScript

status: info name: test,

status: info name: test

Remove comma.

YAML

let val = 'hello'

let val = "hello"

Double quotes.

Swift

if ($data = 89) {{}}

if ($data -eq 89) {{}}

Use -eq.

PowerShell

$values[46]

if ($values.Count -gt 46) {{ $values[46] }}

Check bounds.

PowerShell

let z = 1;

Correct.

JavaScript

b > 2 & a < 59

b > 2 and a < 59

Use 'and' not '&'.

Python

if (a = 27) {{}}

if (a == 27) {{}}

Use ==.

Kotlin

'result' + 89

'result' + 89.to_s

Convert int.

Ruby

if [ $num = 71 ]; then

if [ "$num" = 71 ]; then

Quote variable.

Shell

try {{ throw 'value'; }} catch(e) {{}}

try {{ throw new Error('value'); }} catch(e) {{}}

Throw Error objects.

JavaScript

Close td.

HTML

if temp = 93

if temp == 93

Use ==.

Ruby

let c: number = 'message';

let c: string = 'message';

Fix type.

TypeScript

SELECT name email FROM items;

SELECT name, email FROM items;

Add comma.

SQL

Use double quotes.

JSON

$temp = 63; if ($temp = 63) {{}}

$temp = 63; if ($temp == 63) {{}}

Use ==.

PHP

if foo = 26

if foo == 26

Use ==.

MATLAB

'81' + 69

81 + 69

Avoid string coercion.

JavaScript

SELECT * FROM orders WHRE status=46;

SELECT * FROM orders WHERE status=46;

Fix WHERE.

SQL

if (index = 24)

if (index == 24)

Use ==.

R

WHERE id = '44'

WHERE id = 44

Don't quote integer.

SQL

with open('input.csv') as file_handle: data = file_handle.read()

Correct.

Python

Colon missing.

Python

raise 'test'

raise Exception('test')

Raise needs an exception class.

Python

fmt.Println 'hello'

fmt.Println('hello')

Missing parentheses.

Go

handle

handle()

Add parentheses.

Swift

my @arr = (78,77,45);

Correct.

Perl

h1 {{ font-size:56px color:red; }}

h1 {{ font-size:56px; color:red; }}

Add semicolon.

CSS

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

Correct.

Rust

<hr>

Self-closing.

HTML

if (num = 52) {{}}

if (num == 52) {{}}

Use ==.

Java

if (c = 32)

if (c == 32)

Use ==.

C++

c = 63

c=63

No spaces.

Shell

DELETE FROM products WHERE id=72

DELETE FROM products WHERE id=72;

Add semicolon.

SQL

Remove trailing comma.

JSON

let c: Int = 'test'

let c: String = 'test'

Fix type.

Swift

list: - item1 - item2

Correct.

YAML

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

if (data = 65) {{}}

if (data === 65) {{}}

Use === for equality.

JavaScript

function process(): void {{ return 8; }}

function process(): number {{ return 8; }}

Return type mismatch.

TypeScript

class Product {{ int bar; }};

class Product {{ public: int bar; }};

Make public.

C++

19index = 10

index19 = 10

Variable cannot start with digit.

Python

<center>value</center>

<div style='text-align:center;'>value</div>

Use CSS.

HTML

items(10)

if length(items) >= 10, items(10), end

Check length.

MATLAB

foo = output

foo = 'output'

Quote strings.

Python

'value' + 38

'value' + str(38)

Can't add int to string.

Python

data.forEach(function(temp) {{ console.log(temp); }})

data.forEach((temp) => {{ console.log(temp); }})

Arrow functions are cleaner.

JavaScript

print('info')

Correct.

R

assert item > 45

Correct.

Python

if val = 81:

if val == 81:

Use == for comparison.

Python

print 'test'

print('test')

print needs parentheses.

Python

<div><p>world</div></p>

<div><p>world</p></div>

Nest properly.

HTML

print 'message'

print 'message';

Add semicolon.

Perl

<ul><li>test<li>world</ul>

<ul><li>test</li><li>world</li></ul>

Close li.

HTML

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

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

Declare before use.

C++

Product.save();

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

Handle promise.

Node.js

<br>

Self-closing.

HTML

for c in range(85) print(c)

for c in range(85): print(c)

Colon after for.

Python