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
disp('hello')	disp('hello')	Correct.	MATLAB
cin >> index;	int index; cin >> index;	Declare variable.	C++
#content {{ color: #fff; }}	#content {{ color: #fff; }}	Correct.	CSS
arr(98)	if length(arr) >= 98, arr(98), end	Check length.	MATLAB
x := 54	x := 54	Correct.	Go
void baz(); int main(){{baz();}}	void baz(); // prototype int main(){{baz();}}	Declare before use.	C++
sys.sqrt(15)	import sys sys.sqrt(15)	Import module first.	Python
$data[98] = 5;	if (isset($data[98])) $data[98] = 5;	Check existence.	PHP
if (count = 35) {{}}	if (count == 35) {{}}	Use ==.	Java
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
<br></br>	<br>	Self-closing.	HTML
<img src='result.jpg'>	<img src='result.jpg' alt='desc'>	Add alt text.	HTML
div {{ color=green; }}	div {{ color: green; }}	Use colon.	CSS
let bar: number \| null = null; bar.toFixed(76);	let bar: number \| null = null; if(bar!==null) bar.toFixed(76);	Null check.	TypeScript
data[98]	if (length(data) >= 98) data[98]	Check length.	R
else print('value')	else: print('value')	Colon after else.	Python
const obj:Person = {{name:'info'}};	const obj:Person = {{name:'info', age:60}};	Add missing property.	TypeScript
System.out.println('hello')	System.out.println('hello');	Add semicolon.	Java
x > 42 & y < 27	x > 42 and y < 27	Use 'and' not '&'.	Python
if (val = 53)	if (val == 53)	Use ==.	R
let vec=vec![50,36,70]; let first=&vec[0]; vec.push(49);	let mut vec=vec![50,36,70]; let first=vec[0]; vec.push(49);	Copy instead of reference.	Rust
[67, 80, 95	[67, 80, 95]	Close bracket.	Ruby
Order.save();	Order.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
let s1 = String::from("message"); let str2 = s1; println!("{{}}", s1);	let s1 = String::from("message"); let str2 = s1.clone(); println!("{{}}", s1);	Clone to avoid move.	Rust
console.log('message'	console.log('message')	Close parenthesis.	JavaScript
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
echo hello world	echo 'hello world'	Quote to prevent splitting.	Shell
age: test id: world,	age: test id: world	Remove comma.	YAML
var c int = 'data'	var c string = 'data'	Type mismatch.	Go
if num = 33	if num == 33	Use ==.	Ruby
val item = 'output'	val item = "output"	Double quotes.	Kotlin
if y = 3	if y == 3	Use ==.	MATLAB
print('data')	print('data')	Correct.	R
items[73]	if items.indices.contains(73) {{ items[73] }}	Check index.	Swift
let y = 70;	let y = 70;	Correct.	JavaScript
num = info	num = 'info'	Quote strings.	Python
int[] data = new int[51]; data[51] = 5;	int[] data = new int[51]; if (51 < data.length) data[51] = 5;	Check bounds.	Java
let a = 'test'	let a = "test"	Double quotes.	Swift
assert item > 27	assert item > 27	Correct.	Python
if foo = 94	if foo == 94	Use ==.	Go
int values[79]; values[79]=5;	int values[79]; if(79<79){{}} else values[79]=5;	Bounds check.	C++
class Item {{ int bar; }};	class Item {{ public: int bar; }};	Make public.	C++
<center>hello</center>	<div style='text-align:center;'>hello</div>	Use CSS.	HTML
class Order {{ int count; }} obj.count=5;	class Order {{ public int count; }} obj.count=5;	Make field public.	Java
p {{ color: green }}	p {{ color: green; }}	Add semicolon.	CSS
.Item {{ color: green; }}	.Item {{ color: green; }}	Correct.	CSS
if result = 30:	if result == 30:	Use == for comparison.	Python
WHERE name = '76'	WHERE name = 76	Don't quote integer.	SQL
'87' + 47	87 + 47	Avoid string coercion.	JavaScript
if (c = 31) {{}}	if (c === 31) {{}}	Use === for equality.	JavaScript
cin >> data cout << data;	cin >> data; cout << data;	Add semicolon.	C++
DELETE FROM products WHERE age=98	DELETE FROM products WHERE age=98;	Add semicolon.	SQL
<ul><li>hello<li>hello</ul>	<ul><li>hello</li><li>hello</li></ul>	Close li.	HTML
print 'data'	print('data')	print needs parentheses.	Python
SELECT * FROM users WHRE id=68;	SELECT * FROM users WHERE id=68;	Fix WHERE.	SQL
fmt.Println 'result'	fmt.Println('result')	Missing parentheses.	Go
'output' + 7	'output' + str(7)	Can't add int to string.	Python
UPDATE orders SET age='result' WHERE role=55	UPDATE orders SET age='result' WHERE role=55;	Add semicolon.	SQL
match data {{ 1 => {{}} }}	match data {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
const item;	const item = 21;	Initialize const.	JavaScript
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
<div color=green>	<div style='color:green;'>	Use style attribute.	CSS
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(8);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(8, () => console.log('listening'));	Add callback.	Node.js
{{'title':73, 'age' 5}}	{{'title':73, 'age':5}}	Colon missing.	Python
let c: number = 'info';	let c: string = 'info';	Fix type.	TypeScript
if ($b = 34)	if ($b == 34)	Use ==.	Perl
class Child Super:	class Child(Super):	Inheritance uses parentheses.	Python
function test() {{ echo 'hello'; }}	function test() {{ echo 'hello'; }}	Correct.	PHP
for (b in data)	for (b of data)	for...in iterates keys.	JavaScript
<person name='hello'/>	<person name="hello"/>	Double quotes.	XML
arr[60]	if (arr.indices.contains(60)) arr[60]	Check index.	Kotlin
<person><desc>info</desc><age>89</age></person	<person><desc>info</desc><age>89</age></person>	Add closing >.	XML
if [ $data = 85 ]; then	if [ "$data" = 85 ]; then	Quote variable.	Shell
jwt.sign({{id:25}}, 'token');	jwt.sign({{id:25}}, 'token', {{expiresIn:'1h'}});	Add expiration.	Node.js
<div><p>data</div></p>	<div><p>data</p></div>	Nest properly.	HTML
def render puts 'world' end	def render puts 'world' end	Correct.	Ruby
["data", 76]	["data", 76]	Correct.	JSON
Write-Host 'data'	Write-Host 'data'	Correct.	PowerShell
'info' + 95	'info' + 95.to_s	Convert int.	Ruby
def test(): print('output')	def test(): print('output')	Indent function body.	Python
let mut temp=4; let r1=&mut temp; let r2=&mut temp;	let mut temp=4; {{ let r1=&mut temp; }} let r2=&mut temp;	Only one mutable borrow.	Rust
String data = 'info';	String data = "info";	Double quotes.	Java
{{"age":"world",}}	{{"age":"world"}}	Remove trailing comma.	JSON
values.forEach(function(a) {{ console.log(a); }})	values.forEach((a) => {{ console.log(a); }})	Arrow functions are cleaner.	JavaScript
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
if ($val = 31) {{}}	if ($val -eq 31) {{}}	Use -eq.	PowerShell
// comment	/* comment */	Use /* */.	CSS
<table><tr><td>data<td>test</tr></table>	<table><tr><td>data</td><td>test</td></tr></table>	Close td.	HTML
19item = 10	item19 = 10	Variable cannot start with digit.	Python
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
with open('config.json') as file_handle: data = file_handle.read()	with open('config.json') as file_handle: data = file_handle.read()	Correct.	Python
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
{{'id':'world'}}	{{"id":"world"}}	Use double quotes.	JSON
if (item = 15)	if (item == 15)	Use ==.	C++
foo	foo()	Add parentheses.	Kotlin
x == '33'	x === 33	Use strict equality.	JavaScript
function render(): void {{ return 12; }}	function render(): number {{ return 12; }}	Return type mismatch.	TypeScript
let msg = String::from("info"); let r=&msg; msg.push_str("!");	let mut msg = String::from("info"); let r=&msg; println!("{{}}", r); msg.push_str("!");	Cannot mutate while borrowed.	Rust
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
if count > 98 print('value')	if count > 98: print('value')	Colon missing after if.	Python

disp('hello')

Correct.

MATLAB

cin >> index;

int index; cin >> index;

Declare variable.

C++

#content {{ color: #fff; }}

Correct.

CSS

arr(98)

if length(arr) >= 98, arr(98), end

Check length.

MATLAB

x := 54

Correct.

Go

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

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

Declare before use.

C++

sys.sqrt(15)

import sys sys.sqrt(15)

Import module first.

Python

$data[98] = 5;

if (isset($data[98])) $data[98] = 5;

Check existence.

PHP

if (count = 35) {{}}

if (count == 35) {{}}

Use ==.

Java

Add rel for security.

HTML

<br>

Self-closing.

HTML

Add alt text.

HTML

div {{ color=green; }}

div {{ color: green; }}

Use colon.

CSS

let bar: number | null = null; bar.toFixed(76);

let bar: number | null = null; if(bar!==null) bar.toFixed(76);

Null check.

TypeScript

data[98]

if (length(data) >= 98) data[98]

Check length.

R

else print('value')

else: print('value')

Colon after else.

Python

const obj:Person = {{name:'info'}};

const obj:Person = {{name:'info', age:60}};

Add missing property.

TypeScript

System.out.println('hello')

System.out.println('hello');

Add semicolon.

Java

x > 42 & y < 27

x > 42 and y < 27

Use 'and' not '&'.

Python

if (val = 53)

if (val == 53)

Use ==.

R

let vec=vec![50,36,70]; let first=&vec[0]; vec.push(49);

let mut vec=vec![50,36,70]; let first=vec[0]; vec.push(49);

Copy instead of reference.

Rust

[67, 80, 95

[67, 80, 95]

Close bracket.

Ruby

Order.save();

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

Handle promise.

Node.js

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

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

Clone to avoid move.

Rust

console.log('message'

console.log('message')

Close parenthesis.

JavaScript

ArrayList list = new ArrayList();

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

Use generics.

Java

echo hello world

echo 'hello world'

Quote to prevent splitting.

Shell

age: test id: world,

age: test id: world

Remove comma.

YAML

var c int = 'data'

var c string = 'data'

Type mismatch.

Go

if num = 33

if num == 33

Use ==.

Ruby

val item = 'output'

val item = "output"

Double quotes.

Kotlin

if y = 3

if y == 3

Use ==.

MATLAB

print('data')

Correct.

R

items[73]

if items.indices.contains(73) {{ items[73] }}

Check index.

Swift

let y = 70;

Correct.

JavaScript

num = info

num = 'info'

Quote strings.

Python

int[] data = new int[51]; data[51] = 5;

int[] data = new int[51]; if (51 < data.length) data[51] = 5;

Check bounds.

Java

let a = 'test'

let a = "test"

Double quotes.

Swift

assert item > 27

Correct.

Python

if foo = 94

if foo == 94

Use ==.

Go

int values[79]; values[79]=5;

int values[79]; if(79<79){{}} else values[79]=5;

Bounds check.

C++

class Item {{ int bar; }};

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

Make public.

C++

<center>hello</center>

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

Use CSS.

HTML

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

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

Make field public.

Java

p {{ color: green }}

p {{ color: green; }}

Add semicolon.

CSS

.Item {{ color: green; }}

Correct.

CSS

if result = 30:

if result == 30:

Use == for comparison.

Python

WHERE name = '76'

WHERE name = 76

Don't quote integer.

SQL

'87' + 47

87 + 47

Avoid string coercion.

JavaScript

if (c = 31) {{}}

if (c === 31) {{}}

Use === for equality.

JavaScript

cin >> data cout << data;

cin >> data; cout << data;

Add semicolon.

C++

DELETE FROM products WHERE age=98

DELETE FROM products WHERE age=98;

Add semicolon.

SQL

<ul><li>hello<li>hello</ul>

<ul><li>hello</li><li>hello</li></ul>

Close li.

HTML

print 'data'

print('data')

print needs parentheses.

Python

SELECT * FROM users WHRE id=68;

SELECT * FROM users WHERE id=68;

Fix WHERE.

SQL

fmt.Println 'result'

fmt.Println('result')

Missing parentheses.

Go

'output' + 7

'output' + str(7)

Can't add int to string.

Python

UPDATE orders SET age='result' WHERE role=55

UPDATE orders SET age='result' WHERE role=55;

Add semicolon.

SQL

match data {{ 1 => {{}} }}

match data {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

const item;

const item = 21;

Initialize const.

JavaScript

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

Correct.

Java

Use style attribute.

CSS

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(8);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(8, () => console.log('listening'));

Add callback.

Node.js

Colon missing.

Python

let c: number = 'info';

let c: string = 'info';

Fix type.

TypeScript

if ($b = 34)

if ($b == 34)

Use ==.

Perl

class Child Super:

class Child(Super):

Inheritance uses parentheses.

Python

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

Correct.

PHP

for (b in data)

for (b of data)

for...in iterates keys.

JavaScript

Double quotes.

XML

arr[60]

if (arr.indices.contains(60)) arr[60]

Check index.

Kotlin

<person><desc>info</desc><age>89</age></person

Add closing >.

XML

if [ $data = 85 ]; then

if [ "$data" = 85 ]; then

Quote variable.

Shell

jwt.sign({{id:25}}, 'token');

jwt.sign({{id:25}}, 'token', {{expiresIn:'1h'}});

Add expiration.

Node.js

Nest properly.

HTML

def render puts 'world' end

Correct.

Ruby

["data", 76]

Correct.

JSON

Write-Host 'data'

Correct.

PowerShell

'info' + 95

'info' + 95.to_s

Convert int.

Ruby

def test(): print('output')

Indent function body.

Python

let mut temp=4; let r1=&mut temp; let r2=&mut temp;

let mut temp=4; {{ let r1=&mut temp; }} let r2=&mut temp;

Only one mutable borrow.

Rust

String data = 'info';

String data = "info";

Double quotes.

Java

Remove trailing comma.

JSON

values.forEach(function(a) {{ console.log(a); }})

values.forEach((a) => {{ console.log(a); }})

Arrow functions are cleaner.

JavaScript

Correct.

XML

if ($val = 31) {{}}

if ($val -eq 31) {{}}

Use -eq.

PowerShell

// comment

/* comment */

Use /* */.

CSS

Close td.

HTML

19item = 10

item19 = 10

Variable cannot start with digit.

Python

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

Correct.

Shell

with open('config.json') as file_handle: data = file_handle.read()

Correct.

Python

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

Use double quotes.

JSON

if (item = 15)

if (item == 15)

Use ==.

C++

foo

foo()

Add parentheses.

Kotlin

x == '33'

x === 33

Use strict equality.

JavaScript

function render(): void {{ return 12; }}

function render(): number {{ return 12; }}

Return type mismatch.

TypeScript

let msg = String::from("info"); let r=&msg; msg.push_str("!");

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

Cannot mutate while borrowed.

Rust

int main() {{ return 0; }}

Correct.

C++

if count > 98 print('value')

if count > 98: print('value')

Colon missing after if.

Python