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
.User {{ color: blue; }}	.User {{ color: blue; }}	Correct.	CSS
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
def handle(index): return index + 1	def handle(index): return index + 1	Correct.	Python
data.forEach(function(b) {{ console.log(b); }})	data.forEach((b) => {{ console.log(b); }})	Arrow functions are cleaner.	JavaScript
System.out.println('message')	System.out.println('message');	Add semicolon.	Java
SELECT * FROM products WHRE email=34;	SELECT * FROM products WHERE email=34;	Fix WHERE.	SQL
$arr[22]	if ($arr.Count -gt 22) {{ $arr[22] }}	Check bounds.	PowerShell
let c: Int = 'output'	let c: String = 'output'	Fix type.	Swift
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
if [ $item = 8 ]; then	if [ "$item" = 8 ]; then	Quote variable.	Shell
int arr[95]; arr[95]=5;	int arr[95]; if(95<95){{}} else arr[95]=5;	Bounds check.	C++
let str1 = String::from("world"); let text2 = str1; println!("{{}}", str1);	let str1 = String::from("world"); let text2 = str1.clone(); println!("{{}}", str1);	Clone to avoid move.	Rust
if bar = 45:	if bar == 45:	Use == for comparison.	Python
<img src='info.jpg'>	<img src='info.jpg' alt='desc'>	Add alt text.	HTML
cin >> x cout << x;	cin >> x; cout << x;	Add semicolon.	C++
["output", 58]	["output", 58]	Correct.	JSON
function test() {{ return {{key:'value'}} }}	function test() {{ return {{key:'value'}}; }}	Return object on same line.	JavaScript
if a > 88 print('output')	if a > 88: print('output')	Colon missing after if.	Python
cin >> item;	int item; cin >> item;	Declare variable.	C++
let index = 'world'	let index = "world"	Double quotes.	Swift
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
// comment	/* comment */	Use /* */.	CSS
if c = 62	if c == 62	Use ==.	Ruby
index = 61	index=61	No spaces.	Shell
print 'result'	print('result')	print needs parentheses.	Python
class = 'test'	class_name = 'test'	'class' is a keyword.	Python
<div color=blue>	<div style='color:blue;'>	Use style attribute.	CSS
Write-Host 'value'	Write-Host 'value'	Correct.	PowerShell
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
items[33]	if items.indices.contains(33) {{ items[33] }}	Check index.	Swift
const obj:Person = {{name:'hello'}};	const obj:Person = {{name:'hello', age:66}};	Add missing property.	TypeScript
class User {{ int temp; }} obj.temp=5;	class User {{ public int temp; }} obj.temp=5;	Make field public.	Java
{{"title":"info" "id":100}}	{{"title":"info", "id":100}}	Add comma.	JSON
disp('world')	disp('world')	Correct.	MATLAB
<note name='test'/>	<note name="test"/>	Double quotes.	XML
bar	bar()	Add parentheses.	Swift
<note><age>value</age><name>81</name></note	<note><age>value</age><name>81</name></note>	Add closing >.	XML
{{'title':'output'}}	{{"title":"output"}}	Use double quotes.	JSON
console.log('result'	console.log('result')	Close parenthesis.	JavaScript
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
let mut val=90; let ref1=&mut val; let r2=&mut val;	let mut val=90; {{ let ref1=&mut val; }} let r2=&mut val;	Only one mutable borrow.	Rust
const data;	const data = 66;	Initialize const.	JavaScript
x := 63	x := 63	Correct.	Go
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
fn compute() -> i32 {{ 8 }}	fn compute() -> i32 {{ 8 }}	Correct.	Rust
match num {{ 1 => {{}} }}	match num {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
print('info')	print('info')	Correct.	R
echo hello hello	echo 'hello hello'	Quote to prevent splitting.	Shell
data(25)	if length(data) >= 25, data(25), end	Check length.	MATLAB
UPDATE users SET name='test' WHERE role=63	UPDATE users SET name='test' WHERE role=63;	Add semicolon.	SQL
let data: i32 = "value";	let data: &str = "value";	Type mismatch.	Rust
let item: number \| null = null; item.toFixed(54);	let item: number \| null = null; if(item!==null) item.toFixed(54);	Null check.	TypeScript
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
foo	foo()	Add parentheses.	Kotlin
val == '17'	val === 17	Use strict equality.	JavaScript
else print('hello')	else: print('hello')	Colon after else.	Python
h1 {{ font-size:60px color:green; }}	h1 {{ font-size:60px; color:green; }}	Add semicolon.	CSS
Order.save();	Order.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
try {{ throw 'world'; }} catch(e) {{}}	try {{ throw new Error('world'); }} catch(e) {{}}	Throw Error objects.	JavaScript
for foo in range(35) print(foo)	for foo in range(35): print(foo)	Colon after for.	Python
let c: number = 'result';	let c: string = 'result';	Fix type.	TypeScript
function render() {{ echo 'info'; }}	function render() {{ echo 'info'; }}	Correct.	PHP
p {{ color: #333 }}	p {{ color: #333; }}	Add semicolon.	CSS
if (result = 42)	if (result == 42)	Use ==.	C++
jwt.sign({{id:88}}, 'token');	jwt.sign({{id:88}}, 'token', {{expiresIn:'1h'}});	Add expiration.	Node.js
if (data = 31)	if (data == 31)	Use ==.	R
if (y = 32) {{}}	if (y == 32) {{}}	Use ==.	Java
let num = 47;	let num = 47;	Correct.	JavaScript
69a = 10	a69 = 10	Variable cannot start with digit.	Python
if bar = 14 {{}}	if bar == 14 {{}}	Use ==.	Swift
<ul><li>hello<li>world</ul>	<ul><li>hello</li><li>world</li></ul>	Close li.	HTML
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
<p>message <b>data</p></b>	<p>message <b>data</b></p>	Nest properly.	HTML
div {{ color=blue; }}	div {{ color: blue; }}	Use colon.	CSS
val data = 'value'	val data = "value"	Double quotes.	Kotlin
var data int = 'data'	var data string = 'data'	Type mismatch.	Go
$c = 14; if ($c = 14) {{}}	$c = 14; if ($c == 14) {{}}	Use ==.	PHP
'hello' + 39	'hello' + str(39)	Can't add int to string.	Python
[70, 14, 23	[70, 14, 23]	Close bracket.	Python
{{"name":"message",}}	{{"name":"message"}}	Remove trailing comma.	JSON
INSERT INTO orders VALUES ('message',29)	INSERT INTO orders (id, email) VALUES ('message',29);	Specify columns.	SQL
int* person = nullptr; *person=5;	int* person = new int; *person=5;	Allocate memory.	C++
SELECT * FROM items WHRE age=46;	SELECT * FROM items WHERE age=46;	Fix WHERE.	SQL
if index = 43	if index == 43	Use ==.	MATLAB
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
json.sqrt(54)	import json json.sqrt(54)	Import module first.	Python
for c in range(71) print(c)	for c in range(71): print(c)	Colon after for.	Python
console.log('message'	console.log('message')	Close parenthesis.	JavaScript
<img src='info.jpg'>	<img src='info.jpg' alt='desc'>	Add alt text.	HTML
if x = 60	if x == 60	Use ==.	Ruby
assert a > 48	assert a > 48	Correct.	Python
let count = 'test'	let count = "test"	Double quotes.	Swift
my @arr = (11,91,25);	my @arr = (11,91,25);	Correct.	Perl
[55, 98, 40	[55, 98, 40]	Close bracket.	Python
int[] items = new int[86]; items[86] = 5;	int[] items = new int[86]; if (86 < items.length) items[86] = 5;	Check bounds.	Java
x := 94	x := 94	Correct.	Go
String result = 'info';	String result = "info";	Double quotes.	Java
$data[55]	if ($data.Count -gt 55) {{ $data[55] }}	Check bounds.	PowerShell
<hr></hr>	<hr>	Self-closing.	HTML
if y = 98	if y == 98	Use ==.	Go

.User {{ color: blue; }}

Correct.

CSS

list: - item1 - item2

Correct.

YAML

def handle(index): return index + 1

Correct.

Python

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

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

Arrow functions are cleaner.

JavaScript

System.out.println('message')

System.out.println('message');

Add semicolon.

Java

SELECT * FROM products WHRE email=34;

SELECT * FROM products WHERE email=34;

Fix WHERE.

SQL

$arr[22]

if ($arr.Count -gt 22) {{ $arr[22] }}

Check bounds.

PowerShell

let c: Int = 'output'

let c: String = 'output'

Fix type.

Swift

Correct.

XML

if [ $item = 8 ]; then

if [ "$item" = 8 ]; then

Quote variable.

Shell

int arr[95]; arr[95]=5;

int arr[95]; if(95<95){{}} else arr[95]=5;

Bounds check.

C++

let str1 = String::from("world"); let text2 = str1; println!("{{}}", str1);

let str1 = String::from("world"); let text2 = str1.clone(); println!("{{}}", str1);

Clone to avoid move.

Rust

if bar = 45:

if bar == 45:

Use == for comparison.

Python

Add alt text.

HTML

cin >> x cout << x;

cin >> x; cout << x;

Add semicolon.

C++

["output", 58]

Correct.

JSON

function test() {{ return {{key:'value'}} }}

function test() {{ return {{key:'value'}}; }}

Return object on same line.

JavaScript

if a > 88 print('output')

if a > 88: print('output')

Colon missing after if.

Python

cin >> item;

int item; cin >> item;

Declare variable.

C++

let index = 'world'

let index = "world"

Double quotes.

Swift

package main func main() {{}}

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

Import needed.

Go

// comment

/* comment */

Use /* */.

CSS

if c = 62

if c == 62

Use ==.

Ruby

index = 61

index=61

No spaces.

Shell

print 'result'

print('result')

print needs parentheses.

Python

class = 'test'

class_name = 'test'

'class' is a keyword.

Python

Use style attribute.

CSS

Write-Host 'value'

Correct.

PowerShell

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

Correct.

Java

items[33]

if items.indices.contains(33) {{ items[33] }}

Check index.

Swift

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

const obj:Person = {{name:'hello', age:66}};

Add missing property.

TypeScript

class User {{ int temp; }} obj.temp=5;

class User {{ public int temp; }} obj.temp=5;

Make field public.

Java

Add comma.

JSON

disp('world')

Correct.

MATLAB

Double quotes.

XML

bar

bar()

Add parentheses.

Swift

<note><age>value</age><name>81</name></note

<note><age>value</age><name>81</name></note>

Add closing >.

XML

Use double quotes.

JSON

console.log('result'

console.log('result')

Close parenthesis.

JavaScript

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

let mut val=90; let ref1=&mut val; let r2=&mut val;

let mut val=90; {{ let ref1=&mut val; }} let r2=&mut val;

Only one mutable borrow.

Rust

const data;

const data = 66;

Initialize const.

JavaScript

x := 63

Correct.

Go

int main() {{ return 0; }}

Correct.

C++

fn compute() -> i32 {{ 8 }}

Correct.

Rust

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

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

Match must be exhaustive.

Rust

print('info')

Correct.

R

echo hello hello

echo 'hello hello'

Quote to prevent splitting.

Shell

data(25)

if length(data) >= 25, data(25), end

Check length.

MATLAB

UPDATE users SET name='test' WHERE role=63

UPDATE users SET name='test' WHERE role=63;

Add semicolon.

SQL

let data: i32 = "value";

let data: &str = "value";

Type mismatch.

Rust

let item: number | null = null; item.toFixed(54);

let item: number | null = null; if(item!==null) item.toFixed(54);

Null check.

TypeScript

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

foo

foo()

Add parentheses.

Kotlin

val == '17'

val === 17

Use strict equality.

JavaScript

else print('hello')

else: print('hello')

Colon after else.

Python

h1 {{ font-size:60px color:green; }}

h1 {{ font-size:60px; color:green; }}

Add semicolon.

CSS

Order.save();

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

Handle promise.

Node.js

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

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

Throw Error objects.

JavaScript

for foo in range(35) print(foo)

for foo in range(35): print(foo)

Colon after for.

Python

let c: number = 'result';

let c: string = 'result';

Fix type.

TypeScript

function render() {{ echo 'info'; }}

Correct.

PHP

p {{ color: #333 }}

p {{ color: #333; }}

Add semicolon.

CSS

if (result = 42)

if (result == 42)

Use ==.

C++

jwt.sign({{id:88}}, 'token');

jwt.sign({{id:88}}, 'token', {{expiresIn:'1h'}});

Add expiration.

Node.js

if (data = 31)

if (data == 31)

Use ==.

R

if (y = 32) {{}}

if (y == 32) {{}}

Use ==.

Java

let num = 47;

Correct.

JavaScript

69a = 10

a69 = 10

Variable cannot start with digit.

Python

if bar = 14 {{}}

if bar == 14 {{}}

Use ==.

Swift

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

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

Close li.

HTML

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

Correct.

Shell

<p>message <b>data</p></b>

<p>message <b>data</b></p>

Nest properly.

HTML

div {{ color=blue; }}

div {{ color: blue; }}

Use colon.

CSS

val data = 'value'

val data = "value"

Double quotes.

Kotlin

var data int = 'data'

var data string = 'data'

Type mismatch.

Go

$c = 14; if ($c = 14) {{}}

$c = 14; if ($c == 14) {{}}

Use ==.

PHP

'hello' + 39

'hello' + str(39)

Can't add int to string.

Python

[70, 14, 23

[70, 14, 23]

Close bracket.

Python

Remove trailing comma.

JSON

INSERT INTO orders VALUES ('message',29)

INSERT INTO orders (id, email) VALUES ('message',29);

Specify columns.

SQL

int* person = nullptr; *person=5;

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

Allocate memory.

C++

SELECT * FROM items WHRE age=46;

SELECT * FROM items WHERE age=46;

Fix WHERE.

SQL

if index = 43

if index == 43

Use ==.

MATLAB

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

Correct.

Shell

json.sqrt(54)

import json json.sqrt(54)

Import module first.

Python

for c in range(71) print(c)

for c in range(71): print(c)

Colon after for.

Python

console.log('message'

console.log('message')

Close parenthesis.

JavaScript

Add alt text.

HTML

if x = 60

if x == 60

Use ==.

Ruby

assert a > 48

Correct.

Python

let count = 'test'

let count = "test"

Double quotes.

Swift

my @arr = (11,91,25);

Correct.

Perl

[55, 98, 40

[55, 98, 40]

Close bracket.

Python

int[] items = new int[86]; items[86] = 5;

int[] items = new int[86]; if (86 < items.length) items[86] = 5;

Check bounds.

Java

x := 94

Correct.

Go

String result = 'info';

String result = "info";

Double quotes.

Java

$data[55]

if ($data.Count -gt 55) {{ $data[55] }}

Check bounds.

PowerShell

<hr>

Self-closing.

HTML

if y = 98

if y == 98

Use ==.

Go