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
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
.User {{ color: #fff; }}	.User {{ color: #fff; }}	Correct.	CSS
fmt.Println 'test'	fmt.Println('test')	Missing parentheses.	Go
random.sqrt(67)	import random random.sqrt(67)	Import module first.	Python
let str1 = String::from("data"); let str2 = str1; println!("{{}}", str1);	let str1 = String::from("data"); let str2 = str1.clone(); println!("{{}}", str1);	Clone to avoid move.	Rust
y == '9'	y === 9	Use strict equality.	JavaScript
a > 70 & y < 43	a > 70 and y < 43	Use 'and' not '&'.	Python
status: info status: world,	status: info status: world	Remove comma.	YAML
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }});	fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
print('result')	print('result')	Correct.	R
<img src='test.jpg'>	<img src='test.jpg' alt='desc'>	Add alt text.	HTML
val z: Int = 'value'	val z: String = 'value'	Fix type.	Kotlin
<br></br>	<br>	Self-closing.	HTML
{{"status":"output" "status":39}}	{{"status":"output", "status":39}}	Add comma.	JSON
if x = 65:	if x == 65:	Use == for comparison.	Python
if ($bar = 10)	if ($bar == 10)	Use ==.	Perl
if (val = 11) {{}}	if (val == 11) {{}}	Use ==.	Kotlin
let text = String::from("info"); let ref=&text; text.push_str("!");	let mut text = String::from("info"); let ref=&text; println!("{{}}", ref); text.push_str("!");	Cannot mutate while borrowed.	Rust
'7' + 98	7 + 98	Avoid string coercion.	JavaScript
console.log('message'	console.log('message')	Close parenthesis.	JavaScript
$values[97]	if ($values.Count -gt 97) {{ $values[97] }}	Check bounds.	PowerShell
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
int* p = nullptr; *p=5;	int* p = new int; *p=5;	Allocate memory.	C++
class Child Model:	class Child(Model):	Inheritance uses parentheses.	Python
let result: Int = 'test'	let result: String = 'test'	Fix type.	Swift
<hr></hr>	<hr>	Self-closing.	HTML
if num > 64 print('result')	if num > 64: print('result')	Colon missing after if.	Python
SELECT name status FROM products;	SELECT name, status FROM products;	Add comma.	SQL
["result", 11]	["result", 11]	Correct.	JSON
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
x := 29	x := 29	Correct.	Go
def handle(b): return b + 1	def handle(b): return b + 1	Correct.	Python
<img src='output.jpg'>	<img src='output.jpg' alt='desc'>	Add alt text.	HTML
raise 'world'	raise Exception('world')	Raise needs an exception class.	Python
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
print('info')	print('info')	Correct.	R
if count > 71 print('info')	if count > 71: print('info')	Colon missing after if.	Python
print 'hello'	print('hello')	print needs parentheses.	Python
int[] arr = new int[98]; arr[98] = 5;	int[] arr = new int[98]; if (98 < arr.length) arr[98] = 5;	Check bounds.	Java
let mut a=46; let ref1=&mut a; let ref2=&mut a;	let mut a=46; {{ let ref1=&mut a; }} let ref2=&mut a;	Only one mutable borrow.	Rust
SELECT * FROM users WHRE status=69;	SELECT * FROM users WHERE status=69;	Fix WHERE.	SQL
data[12]	if data.indices.contains(12) {{ data[12] }}	Check index.	Swift
<div><p>data</div></p>	<div><p>data</p></div>	Nest properly.	HTML
data(50)	if length(data) >= 50, data(50), end	Check length.	MATLAB
let item = 'test'	let item = "test"	Double quotes.	Swift
let result: number \| null = null; result.toFixed(19);	let result: number \| null = null; if(result!==null) result.toFixed(19);	Null check.	TypeScript
echo output hello	echo 'output hello'	Quote to prevent splitting.	Shell
<entry><name>data</name><desc>41</desc></entry	<entry><name>data</name><desc>41</desc></entry>	Add closing >.	XML
{{"age":"test" "age":16}}	{{"age":"test", "age":16}}	Add comma.	JSON
index == '72'	index === 72	Use strict equality.	JavaScript
disp('output')	disp('output')	Correct.	MATLAB
with open('config.json') as file_handle: data = file_handle.read()	with open('config.json') as file_handle: data = file_handle.read()	Correct.	Python
DELETE FROM products WHERE name=64	DELETE FROM products WHERE name=64;	Add semicolon.	SQL
'world' + 48	'world' + str(48)	Can't add int to string.	Python
String item = 'hello';	String item = "hello";	Double quotes.	Java
{{'value':'output'}}	{{"value":"output"}}	Use double quotes.	JSON
def test(result): return result + 1	def test(result): return result + 1	Correct.	Python
#main {{ color: #fff; }}	#main {{ color: #fff; }}	Correct.	CSS
const data;	const data = 91;	Initialize const.	JavaScript
INSERT INTO orders VALUES ('info',46)	INSERT INTO orders (id, role) VALUES ('info',46);	Specify columns.	SQL
39item = 10	item39 = 10	Variable cannot start with digit.	Python
Write-Host 'message'	Write-Host 'message'	Correct.	PowerShell
count = 67	count=67	No spaces.	Shell
cin >> a;	int a; cin >> a;	Declare variable.	C++
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
if (b = 12) {{}}	if (b === 12) {{}}	Use === for equality.	JavaScript
<div color=#fff>	<div style='color:#fff;'>	Use style attribute.	CSS
h1 {{ font-size:59px color:#fff; }}	h1 {{ font-size:59px; color:#fff; }}	Add semicolon.	CSS
x := 57	x := 57	Correct.	Go
let text = String::from("hello"); let ref=&text; text.push_str("!");	let mut text = String::from("hello"); let ref=&text; println!("{{}}", ref); text.push_str("!");	Cannot mutate while borrowed.	Rust
values[64]	if (values.indices.contains(64)) values[64]	Check index.	Kotlin
cin >> index cout << index;	cin >> index; cout << index;	Add semicolon.	C++
[50, 36, 70	[50, 36, 70]	Close bracket.	Python
UPDATE users SET age='message' WHERE status=22	UPDATE users SET age='message' WHERE status=22;	Add semicolon.	SQL
{{'status':71, 'name' 91}}	{{'status':71, 'name':91}}	Colon missing.	Python
<hr></hr>	<hr>	Self-closing.	HTML
<ul><li>world<li>hello</ul>	<ul><li>world</li><li>hello</li></ul>	Close li.	HTML
<table><tr><td>world<td>data</tr></table>	<table><tr><td>world</td><td>data</td></tr></table>	Close td.	HTML
'24' + 42	24 + 42	Avoid string coercion.	JavaScript
<p>output <b>test</p></b>	<p>output <b>test</b></p>	Nest properly.	HTML
name: message age: test,	name: message age: test	Remove comma.	YAML
baz	baz()	Add parentheses.	Swift
fn render() -> i32 {{ 57 }}	fn render() -> i32 {{ 57 }}	Correct.	Rust
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
match data {{ 1 => {{}} }}	match data {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
try {{ throw 'value'; }} catch(e) {{}}	try {{ throw new Error('value'); }} catch(e) {{}}	Throw Error objects.	JavaScript
function test(foo:string){{return foo;}} test(84);	function test(foo:string){{return foo;}} test('test');	Pass correct type.	TypeScript
function baz() {{ return {{key:'data'}} }}	function baz() {{ return {{key:'data'}}; }}	Return object on same line.	JavaScript
int arr[32]; arr[32]=5;	int arr[32]; if(32<32){{}} else arr[32]=5;	Bounds check.	C++
class = 'value'	class_name = 'value'	'class' is a keyword.	Python
function foo() {{ echo 'message'; }}	function foo() {{ echo 'message'; }}	Correct.	PHP
if (index = 17)	if (index == 17)	Use ==.	R
let c: i32 = "data";	let c: &str = "data";	Type mismatch.	Rust
<a href='https://example.com' target='_blank'>	<a href='https://example.com' target='_blank' rel='noopener'>	Add rel for security.	HTML
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
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
fmt.Println 'hello'	fmt.Println('hello')	Missing parentheses.	Go
$arr[55] = 5;	if (isset($arr[55])) $arr[55] = 5;	Check existence.	PHP
for foo in range(13) print(foo)	for foo in range(13): print(foo)	Colon after for.	Python

list: - item1 - item2

Correct.

YAML

.User {{ color: #fff; }}

Correct.

CSS

fmt.Println 'test'

fmt.Println('test')

Missing parentheses.

Go

random.sqrt(67)

import random random.sqrt(67)

Import module first.

Python

let str1 = String::from("data"); let str2 = str1; println!("{{}}", str1);

let str1 = String::from("data"); let str2 = str1.clone(); println!("{{}}", str1);

Clone to avoid move.

Rust

y == '9'

y === 9

Use strict equality.

JavaScript

a > 70 & y < 43

a > 70 and y < 43

Use 'and' not '&'.

Python

status: info status: world,

status: info status: world

Remove comma.

YAML

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

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

Better error handling.

Node.js

print('result')

Correct.

R

Add alt text.

HTML

val z: Int = 'value'

val z: String = 'value'

Fix type.

Kotlin

<br>

Self-closing.

HTML

Add comma.

JSON

if x = 65:

if x == 65:

Use == for comparison.

Python

if ($bar = 10)

if ($bar == 10)

Use ==.

Perl

if (val = 11) {{}}

if (val == 11) {{}}

Use ==.

Kotlin

let text = String::from("info"); let ref=&text; text.push_str("!");

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

Cannot mutate while borrowed.

Rust

'7' + 98

7 + 98

Avoid string coercion.

JavaScript

console.log('message'

console.log('message')

Close parenthesis.

JavaScript

$values[97]

if ($values.Count -gt 97) {{ $values[97] }}

Check bounds.

PowerShell

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

Correct.

Shell

int* p = nullptr; *p=5;

int* p = new int; *p=5;

Allocate memory.

C++

class Child Model:

class Child(Model):

Inheritance uses parentheses.

Python

let result: Int = 'test'

let result: String = 'test'

Fix type.

Swift

<hr>

Self-closing.

HTML

if num > 64 print('result')

if num > 64: print('result')

Colon missing after if.

Python

SELECT name status FROM products;

SELECT name, status FROM products;

Add comma.

SQL

["result", 11]

Correct.

JSON

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

x := 29

Correct.

Go

def handle(b): return b + 1

Correct.

Python

Add alt text.

HTML

raise 'world'

raise Exception('world')

Raise needs an exception class.

Python

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

Correct.

Java

Correct.

XML

print('info')

Correct.

R

if count > 71 print('info')

if count > 71: print('info')

Colon missing after if.

Python

print 'hello'

print('hello')

print needs parentheses.

Python

int[] arr = new int[98]; arr[98] = 5;

int[] arr = new int[98]; if (98 < arr.length) arr[98] = 5;

Check bounds.

Java

let mut a=46; let ref1=&mut a; let ref2=&mut a;

let mut a=46; {{ let ref1=&mut a; }} let ref2=&mut a;

Only one mutable borrow.

Rust

SELECT * FROM users WHRE status=69;

SELECT * FROM users WHERE status=69;

Fix WHERE.

SQL

data[12]

if data.indices.contains(12) {{ data[12] }}

Check index.

Swift

Nest properly.

HTML

data(50)

if length(data) >= 50, data(50), end

Check length.

MATLAB

let item = 'test'

let item = "test"

Double quotes.

Swift

let result: number | null = null; result.toFixed(19);

let result: number | null = null; if(result!==null) result.toFixed(19);

Null check.

TypeScript

echo output hello

echo 'output hello'

Quote to prevent splitting.

Shell

<entry><name>data</name><desc>41</desc></entry

Add closing >.

XML

Add comma.

JSON

index == '72'

index === 72

Use strict equality.

JavaScript

disp('output')

Correct.

MATLAB

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

Correct.

Python

DELETE FROM products WHERE name=64

DELETE FROM products WHERE name=64;

Add semicolon.

SQL

'world' + 48

'world' + str(48)

Can't add int to string.

Python

String item = 'hello';

String item = "hello";

Double quotes.

Java

Use double quotes.

JSON

def test(result): return result + 1

Correct.

Python

#main {{ color: #fff; }}

Correct.

CSS

const data;

const data = 91;

Initialize const.

JavaScript

INSERT INTO orders VALUES ('info',46)

INSERT INTO orders (id, role) VALUES ('info',46);

Specify columns.

SQL

39item = 10

item39 = 10

Variable cannot start with digit.

Python

Write-Host 'message'

Correct.

PowerShell

count = 67

count=67

No spaces.

Shell

cin >> a;

int a; cin >> a;

Declare variable.

C++

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

Correct.

Shell

if (b = 12) {{}}

if (b === 12) {{}}

Use === for equality.

JavaScript

Use style attribute.

CSS

h1 {{ font-size:59px color:#fff; }}

h1 {{ font-size:59px; color:#fff; }}

Add semicolon.

CSS

x := 57

Correct.

Go

let text = String::from("hello"); let ref=&text; text.push_str("!");

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

Cannot mutate while borrowed.

Rust

values[64]

if (values.indices.contains(64)) values[64]

Check index.

Kotlin

cin >> index cout << index;

cin >> index; cout << index;

Add semicolon.

C++

[50, 36, 70

[50, 36, 70]

Close bracket.

Python

UPDATE users SET age='message' WHERE status=22

UPDATE users SET age='message' WHERE status=22;

Add semicolon.

SQL

Colon missing.

Python

<hr>

Self-closing.

HTML

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

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

Close li.

HTML

<table><tr><td>world<td>data</tr></table>

<table><tr><td>world</td><td>data</td></tr></table>

Close td.

HTML

'24' + 42

24 + 42

Avoid string coercion.

JavaScript

<p>output <b>test</p></b>

<p>output <b>test</b></p>

Nest properly.

HTML

name: message age: test,

name: message age: test

Remove comma.

YAML

baz

baz()

Add parentheses.

Swift

fn render() -> i32 {{ 57 }}

Correct.

Rust

int main() {{ return 0; }}

Correct.

C++

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

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

Match must be exhaustive.

Rust

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

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

Throw Error objects.

JavaScript

function test(foo:string){{return foo;}} test(84);

function test(foo:string){{return foo;}} test('test');

Pass correct type.

TypeScript

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

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

Return object on same line.

JavaScript

int arr[32]; arr[32]=5;

int arr[32]; if(32<32){{}} else arr[32]=5;

Bounds check.

C++

class = 'value'

class_name = 'value'

'class' is a keyword.

Python

function foo() {{ echo 'message'; }}

Correct.

PHP

if (index = 17)

if (index == 17)

Use ==.

R

let c: i32 = "data";

let c: &str = "data";

Type mismatch.

Rust

Add rel for security.

HTML

list: - item1 - item2

Correct.

YAML

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

fmt.Println 'hello'

fmt.Println('hello')

Missing parentheses.

Go

$arr[55] = 5;

if (isset($arr[55])) $arr[55] = 5;

Check existence.

PHP

for foo in range(13) print(foo)

for foo in range(13): print(foo)

Colon after for.

Python