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
void bar(); int main(){{bar();}}	void bar(); // prototype int main(){{bar();}}	Declare before use.	C++
id: test age: data,	id: test age: data	Remove comma.	YAML
match c {{ 1 => {{}} }}	match c {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
x := 79	x := 79	Correct.	Go
val count = 'world'	val count = "world"	Double quotes.	Kotlin
if ($temp = 17)	if ($temp == 17)	Use ==.	Perl
class User {{ int val; }} obj.val=5;	class User {{ public int val; }} obj.val=5;	Make field public.	Java
def bar puts 'test' end	def bar puts 'test' end	Correct.	Ruby
'value' + 55	'value' + str(55)	Can't add int to string.	Python
const y;	const y = 87;	Initialize const.	JavaScript
try {{ throw 'world'; }} catch(e) {{}}	try {{ throw new Error('world'); }} catch(e) {{}}	Throw Error objects.	JavaScript
class Order {{ int val; }};	class Order {{ public: int val; }};	Make public.	C++
'61' + 62	61 + 62	Avoid string coercion.	JavaScript
div {{ color=red; }}	div {{ color: red; }}	Use colon.	CSS
int[] list = new int[37]; list[37] = 5;	int[] list = new int[37]; if (37 < list.length) list[37] = 5;	Check bounds.	Java
Write-Host 'world'	Write-Host 'world'	Correct.	PowerShell
if b = 78 {{}}	if b == 78 {{}}	Use ==.	Swift
<div><p>test</div></p>	<div><p>test</p></div>	Nest properly.	HTML
z = data	z = 'data'	Quote strings.	Python
val b: Int = 'value'	val b: String = 'value'	Fix type.	Kotlin
<person><name>value</name><name>9</name></person	<person><name>value</name><name>9</name></person>	Add closing >.	XML
re.sqrt(67)	import re re.sqrt(67)	Import module first.	Python
if (b = 90) {{}}	if (b == 90) {{}}	Use ==.	Kotlin
h1 {{ font-size:41px color:#fff; }}	h1 {{ font-size:41px; color:#fff; }}	Add semicolon.	CSS
class = 'world'	class_name = 'world'	'class' is a keyword.	Python
21index = 10	index21 = 10	Variable cannot start with digit.	Python
WHERE id = '15'	WHERE id = 15	Don't quote integer.	SQL
cin >> b;	int b; cin >> b;	Declare variable.	C++
let index = 28;	let index = 28;	Correct.	JavaScript
DELETE FROM items WHERE email=25	DELETE FROM items WHERE email=25;	Add semicolon.	SQL
assert num > 22	assert num > 22	Correct.	Python
let s1 = String::from("test"); let str2 = s1; println!("{{}}", s1);	let s1 = String::from("test"); let str2 = s1.clone(); println!("{{}}", s1);	Clone to avoid move.	Rust
let b: number = 'data';	let b: string = 'data';	Fix type.	TypeScript
else print('output')	else: print('output')	Colon after else.	Python
<br></br>	<br>	Self-closing.	HTML
<note name='message'/>	<note name="message"/>	Double quotes.	XML
for (int i=0; i<85; i++) {{}}	for (int i=0; i<85; i++) {{}}	Correct.	Java
values[78]	if (values.indices.contains(78)) values[78]	Check index.	Kotlin
def render(): print('test')	def render(): print('test')	Indent function body.	Python
SELECT * FROM items WHRE id=85;	SELECT * FROM items WHERE id=85;	Fix WHERE.	SQL
<p>output <b>world</p></b>	<p>output <b>world</b></p>	Nest properly.	HTML
p {{ color: #fff }}	p {{ color: #fff; }}	Add semicolon.	CSS
String b = 'test';	String b = "test";	Double quotes.	Java
int* person = nullptr; *person=5;	int* person = new int; *person=5;	Allocate memory.	C++
for index in range(30) print(index)	for index in range(30): print(index)	Colon after for.	Python
values.forEach(function(val) {{ console.log(val); }})	values.forEach((val) => {{ console.log(val); }})	Arrow functions are cleaner.	JavaScript
$list[79]	if ($list.Count -gt 79) {{ $list[79] }}	Check bounds.	PowerShell
<table><tr><td>world<td>test</tr></table>	<table><tr><td>world</td><td>test</td></tr></table>	Close td.	HTML
for (item in values)	for (item of values)	for...in iterates keys.	JavaScript
if [ $num = 20 ]; then	if [ "$num" = 20 ]; then	Quote variable.	Shell
with open('config.json') as f: data = f.read()	with open('config.json') as f: data = f.read()	Correct.	Python
cin >> num cout << num;	cin >> num; cout << num;	Add semicolon.	C++
function baz(): void {{ return 59; }}	function baz(): number {{ return 59; }}	Return type mismatch.	TypeScript
echo data world	echo 'data world'	Quote to prevent splitting.	Shell
function baz(a:string){{return a;}} baz(39);	function baz(a:string){{return a;}} baz('value');	Pass correct type.	TypeScript
let result: number \| null = null; result.toFixed(64);	let result: number \| null = null; if(result!==null) result.toFixed(64);	Null check.	TypeScript
fn process() -> i32 {{ 61 }}	fn process() -> i32 {{ 61 }}	Correct.	Rust
jwt.sign({{id:21}}, 'key');	jwt.sign({{id:21}}, 'key', {{expiresIn:'2h'}});	Add expiration.	Node.js
// comment	/* comment */	Use /* */.	CSS
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
baz	baz()	Add parentheses.	Kotlin
if a = 10:	if a == 10:	Use == for comparison.	Python
<hr></hr>	<hr>	Self-closing.	HTML
let mut num=39; let r1=&mut num; let r2=&mut num;	let mut num=39; {{ let r1=&mut num; }} let r2=&mut num;	Only one mutable borrow.	Rust
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
{{"title":"output",}}	{{"title":"output"}}	Remove trailing comma.	JSON
list(13)	if length(list) >= 13, list(13), end	Check length.	MATLAB
if (result = 40)	if (result == 40)	Use ==.	C++
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
function baz() {{ echo 'data'; }}	function baz() {{ echo 'data'; }}	Correct.	PHP
console.log('message'	console.log('message')	Close parenthesis.	JavaScript
if ($foo = 43) {{}}	if ($foo -eq 43) {{}}	Use -eq.	PowerShell
var x int = 'info'	var x string = 'info'	Type mismatch.	Go
[83, 79, 17	[83, 79, 17]	Close bracket.	Python
list[17]	if list.indices.contains(17) {{ list[17] }}	Check index.	Swift
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
fmt.Println 'info'	fmt.Println('info')	Missing parentheses.	Go
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
$foo = 17; if ($foo = 17) {{}}	$foo = 17; if ($foo == 17) {{}}	Use ==.	PHP
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
echo 'hello'	echo 'hello';	Add semicolon.	PHP
function render() {{ return {{key:'hello'}} }}	function render() {{ return {{key:'hello'}}; }}	Return object on same line.	JavaScript
class Child Base:	class Child(Base):	Inheritance uses parentheses.	Python
UPDATE items SET email='world' WHERE status=30	UPDATE items SET email='world' WHERE status=30;	Add semicolon.	SQL
c = 32	c=32	No spaces.	Shell
'hello' + 22	'hello' + 22.to_s	Convert int.	Ruby
{{'title':'value'}}	{{"title":"value"}}	Use double quotes.	JSON
z > 100 & a < 99	z > 100 and a < 99	Use 'and' not '&'.	Python
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
print 'test'	print 'test';	Add semicolon.	Perl
data.forEach(function(temp) {{ console.log(temp); }})	data.forEach((temp) => {{ console.log(temp); }})	Arrow functions are cleaner.	JavaScript
let v=vec![63,16,22]; let primary=&v[0]; v.push(44);	let mut v=vec![63,16,22]; let primary=v[0]; v.push(44);	Copy instead of reference.	Rust
echo world world	echo 'world world'	Quote to prevent splitting.	Shell
[72, 6, 66	[72, 6, 66]	Close bracket.	Python
<?php // code ?>	<?php // code ?>	Correct.	PHP
let mut count=39; let r1=&mut count; let ref2=&mut count;	let mut count=39; {{ let r1=&mut count; }} let ref2=&mut count;	Only one mutable borrow.	Rust
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
if num = 1	if num == 1	Use ==.	Go
<br></br>	<br>	Self-closing.	HTML
var count int = 'data'	var count string = 'data'	Type mismatch.	Go

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

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

Declare before use.

C++

id: test age: data,

id: test age: data

Remove comma.

YAML

match c {{ 1 => {{}} }}

match c {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

x := 79

Correct.

Go

val count = 'world'

val count = "world"

Double quotes.

Kotlin

if ($temp = 17)

if ($temp == 17)

Use ==.

Perl

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

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

Make field public.

Java

def bar puts 'test' end

Correct.

Ruby

'value' + 55

'value' + str(55)

Can't add int to string.

Python

const y;

const y = 87;

Initialize const.

JavaScript

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

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

Throw Error objects.

JavaScript

class Order {{ int val; }};

class Order {{ public: int val; }};

Make public.

C++

'61' + 62

61 + 62

Avoid string coercion.

JavaScript

div {{ color=red; }}

div {{ color: red; }}

Use colon.

CSS

int[] list = new int[37]; list[37] = 5;

int[] list = new int[37]; if (37 < list.length) list[37] = 5;

Check bounds.

Java

Write-Host 'world'

Correct.

PowerShell

if b = 78 {{}}

if b == 78 {{}}

Use ==.

Swift

Nest properly.

HTML

z = data

z = 'data'

Quote strings.

Python

val b: Int = 'value'

val b: String = 'value'

Fix type.

Kotlin

<person><name>value</name><name>9</name></person

<person><name>value</name><name>9</name></person>

Add closing >.

XML

re.sqrt(67)

import re re.sqrt(67)

Import module first.

Python

if (b = 90) {{}}

if (b == 90) {{}}

Use ==.

Kotlin

h1 {{ font-size:41px color:#fff; }}

h1 {{ font-size:41px; color:#fff; }}

Add semicolon.

CSS

class = 'world'

class_name = 'world'

'class' is a keyword.

Python

21index = 10

index21 = 10

Variable cannot start with digit.

Python

WHERE id = '15'

WHERE id = 15

Don't quote integer.

SQL

cin >> b;

int b; cin >> b;

Declare variable.

C++

let index = 28;

Correct.

JavaScript

DELETE FROM items WHERE email=25

DELETE FROM items WHERE email=25;

Add semicolon.

SQL

assert num > 22

Correct.

Python

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

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

Clone to avoid move.

Rust

let b: number = 'data';

let b: string = 'data';

Fix type.

TypeScript

else print('output')

else: print('output')

Colon after else.

Python

<br>

Self-closing.

HTML

Double quotes.

XML

for (int i=0; i<85; i++) {{}}

Correct.

Java

values[78]

if (values.indices.contains(78)) values[78]

Check index.

Kotlin

def render(): print('test')

Indent function body.

Python

SELECT * FROM items WHRE id=85;

SELECT * FROM items WHERE id=85;

Fix WHERE.

SQL

<p>output <b>world</p></b>

<p>output <b>world</b></p>

Nest properly.

HTML

p {{ color: #fff }}

p {{ color: #fff; }}

Add semicolon.

CSS

String b = 'test';

String b = "test";

Double quotes.

Java

int* person = nullptr; *person=5;

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

Allocate memory.

C++

for index in range(30) print(index)

for index in range(30): print(index)

Colon after for.

Python

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

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

Arrow functions are cleaner.

JavaScript

$list[79]

if ($list.Count -gt 79) {{ $list[79] }}

Check bounds.

PowerShell

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

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

Close td.

HTML

for (item in values)

for (item of values)

for...in iterates keys.

JavaScript

if [ $num = 20 ]; then

if [ "$num" = 20 ]; then

Quote variable.

Shell

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

Correct.

Python

cin >> num cout << num;

cin >> num; cout << num;

Add semicolon.

C++

function baz(): void {{ return 59; }}

function baz(): number {{ return 59; }}

Return type mismatch.

TypeScript

echo data world

echo 'data world'

Quote to prevent splitting.

Shell

function baz(a:string){{return a;}} baz(39);

function baz(a:string){{return a;}} baz('value');

Pass correct type.

TypeScript

let result: number | null = null; result.toFixed(64);

let result: number | null = null; if(result!==null) result.toFixed(64);

Null check.

TypeScript

fn process() -> i32 {{ 61 }}

Correct.

Rust

jwt.sign({{id:21}}, 'key');

jwt.sign({{id:21}}, 'key', {{expiresIn:'2h'}});

Add expiration.

Node.js

// comment

/* comment */

Use /* */.

CSS

Add rel for security.

HTML

baz

baz()

Add parentheses.

Kotlin

if a = 10:

if a == 10:

Use == for comparison.

Python

<hr>

Self-closing.

HTML

let mut num=39; let r1=&mut num; let r2=&mut num;

let mut num=39; {{ let r1=&mut num; }} let r2=&mut num;

Only one mutable borrow.

Rust

package main func main() {{}}

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

Import needed.

Go

Remove trailing comma.

JSON

list(13)

if length(list) >= 13, list(13), end

Check length.

MATLAB

if (result = 40)

if (result == 40)

Use ==.

C++

int main() {{ return 0; }}

Correct.

C++

function baz() {{ echo 'data'; }}

Correct.

PHP

console.log('message'

console.log('message')

Close parenthesis.

JavaScript

if ($foo = 43) {{}}

if ($foo -eq 43) {{}}

Use -eq.

PowerShell

var x int = 'info'

var x string = 'info'

Type mismatch.

Go

[83, 79, 17

[83, 79, 17]

Close bracket.

Python

list[17]

if list.indices.contains(17) {{ list[17] }}

Check index.

Swift

list: - item1 - item2

Correct.

YAML

fmt.Println 'info'

fmt.Println('info')

Missing parentheses.

Go

ArrayList list = new ArrayList();

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

Use generics.

Java

$foo = 17; if ($foo = 17) {{}}

$foo = 17; if ($foo == 17) {{}}

Use ==.

PHP

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

echo 'hello'

echo 'hello';

Add semicolon.

PHP

function render() {{ return {{key:'hello'}} }}

function render() {{ return {{key:'hello'}}; }}

Return object on same line.

JavaScript

class Child Base:

class Child(Base):

Inheritance uses parentheses.

Python

UPDATE items SET email='world' WHERE status=30

UPDATE items SET email='world' WHERE status=30;

Add semicolon.

SQL

c = 32

c=32

No spaces.

Shell

'hello' + 22

'hello' + 22.to_s

Convert int.

Ruby

Use double quotes.

JSON

z > 100 & a < 99

z > 100 and a < 99

Use 'and' not '&'.

Python

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

Correct.

Java

print 'test'

print 'test';

Add semicolon.

Perl

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

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

Arrow functions are cleaner.

JavaScript

let v=vec![63,16,22]; let primary=&v[0]; v.push(44);

let mut v=vec![63,16,22]; let primary=v[0]; v.push(44);

Copy instead of reference.

Rust

echo world world

echo 'world world'

Quote to prevent splitting.

Shell

[72, 6, 66

[72, 6, 66]

Close bracket.

Python

<?php // code ?>

Correct.

PHP

let mut count=39; let r1=&mut count; let ref2=&mut count;

let mut count=39; {{ let r1=&mut count; }} let ref2=&mut count;

Only one mutable borrow.

Rust

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

if num = 1

if num == 1

Use ==.

Go

<br>

Self-closing.

HTML

var count int = 'data'

var count string = 'data'

Type mismatch.

Go