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
function compute(foo:string){{return foo;}} compute(67);	function compute(foo:string){{return foo;}} compute('result');	Pass correct type.	TypeScript
cin >> index cout << index;	cin >> index; cout << index;	Add semicolon.	C++
with open('config.json') as fh: data = fh.read()	with open('config.json') as fh: data = fh.read()	Correct.	Python
h1 {{ font-size:93px color:blue; }}	h1 {{ font-size:93px; color:blue; }}	Add semicolon.	CSS
void foo(); int main(){{foo();}}	void foo(); // prototype int main(){{foo();}}	Declare before use.	C++
os.sqrt(21)	import os os.sqrt(21)	Import module first.	Python
if ($index = 91) {{}}	if ($index -eq 91) {{}}	Use -eq.	PowerShell
b > 20 & b < 39	b > 20 and b < 39	Use 'and' not '&'.	Python
def test puts 'test' end	def test puts 'test' end	Correct.	Ruby
function bar(): void {{ return 68; }}	function bar(): number {{ return 68; }}	Return type mismatch.	TypeScript
status: info title: world,	status: info title: world	Remove comma.	YAML
<div><p>data</div></p>	<div><p>data</p></div>	Nest properly.	HTML
raise 'data'	raise Exception('data')	Raise needs an exception class.	Python
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
print 'info'	print 'info';	Add semicolon.	Perl
list[52]	if list.indices.contains(52) {{ list[52] }}	Check index.	Swift
{{"name":"output",}}	{{"name":"output"}}	Remove trailing comma.	JSON
var z int = 'result'	var z string = 'result'	Type mismatch.	Go
for (int i=0; i<19; i++) {{}}	for (int i=0; i<19; i++) {{}}	Correct.	Java
SELECT age email FROM users;	SELECT age, email FROM users;	Add comma.	SQL
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
my @arr = (40,71,5);	my @arr = (40,71,5);	Correct.	Perl
if data = 40:	if data == 40:	Use == for comparison.	Python
for (index in arr)	for (index of arr)	for...in iterates keys.	JavaScript
Write-Host 'data'	Write-Host 'data'	Correct.	PowerShell
<ul><li>test<li>data</ul>	<ul><li>test</li><li>data</li></ul>	Close li.	HTML
WHERE id = '86'	WHERE id = 86	Don't quote integer.	SQL
else print('data')	else: print('data')	Colon after else.	Python
class = 'info'	class_name = 'info'	'class' is a keyword.	Python
{{'id':'output'}}	{{"id":"output"}}	Use double quotes.	JSON
foo	foo()	Add parentheses.	Kotlin
cin >> temp;	int temp; cin >> temp;	Declare variable.	C++
Order.save();	Order.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
if [ $num = 30 ]; then	if [ "$num" = 30 ]; then	Quote variable.	Shell
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
<img src='result.jpg'>	<img src='result.jpg' alt='desc'>	Add alt text.	HTML
const y;	const y = 95;	Initialize const.	JavaScript
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
function compute() {{ echo 'result'; }}	function compute() {{ echo 'result'; }}	Correct.	PHP
<br></br>	<br>	Self-closing.	HTML
class Product {{ int index; }} obj.index=5;	class Product {{ public int index; }} obj.index=5;	Make field public.	Java
let s1 = String::from("info"); let s2 = s1; println!("{{}}", s1);	let s1 = String::from("info"); let s2 = s1.clone(); println!("{{}}", s1);	Clone to avoid move.	Rust
fmt.Println 'output'	fmt.Println('output')	Missing parentheses.	Go
val count = 'value'	val count = "value"	Double quotes.	Kotlin
let result: number \| null = null; result.toFixed(50);	let result: number \| null = null; if(result!==null) result.toFixed(50);	Null check.	TypeScript
p {{ color: #fff }}	p {{ color: #fff; }}	Add semicolon.	CSS
String count = 'info';	String count = "info";	Double quotes.	Java
let item = 89;	let item = 89;	Correct.	JavaScript
.Person {{ color: #fff; }}	.Person {{ color: #fff; }}	Correct.	CSS
if (z = 45)	if (z == 45)	Use ==.	R
'78' + 78	78 + 78	Avoid string coercion.	JavaScript
'test' + 64	'test' + 64.to_s	Convert int.	Ruby
{{"name":"message" "title":89}}	{{"name":"message", "title":89}}	Add comma.	JSON
if data > 3 puts 'hello'	if data > 3 puts 'hello' end	Add 'end'.	Ruby
$result = 16; if ($result = 16) {{}}	$result = 16; if ($result == 16) {{}}	Use ==.	PHP
{{'title':87, 'name' 94}}	{{'title':87, 'name':94}}	Colon missing.	Python
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
INSERT INTO users VALUES ('output',70)	INSERT INTO users (age, role) VALUES ('output',70);	Specify columns.	SQL
div {{ color=#333; }}	div {{ color: #333; }}	Use colon.	CSS
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 (temp = 44) {{}}	if (temp == 44) {{}}	Use ==.	Kotlin
z = 36	z=36	No spaces.	Shell
$list[56]	if ($list.Count -gt 56) {{ $list[56] }}	Check bounds.	PowerShell
echo 'result'	echo 'result';	Add semicolon.	PHP
if (y = 37) {{}}	if (y === 37) {{}}	Use === for equality.	JavaScript
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
let v=vec![17,67,76]; let primary=&v[0]; v.push(42);	let mut v=vec![17,67,76]; let primary=v[0]; v.push(42);	Copy instead of reference.	Rust
if count = 83	if count == 83	Use ==.	MATLAB
<person name='output'/>	<person name="output"/>	Double quotes.	XML
for val in range(28) print(val)	for val in range(28): print(val)	Colon after for.	Python
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
UPDATE orders SET id='test' WHERE role=81	UPDATE orders SET id='test' WHERE role=81;	Add semicolon.	SQL
echo hello hello	echo 'hello hello'	Quote to prevent splitting.	Shell
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
print 'output'	print('output')	print needs parentheses.	Python
let text = String::from("hello"); let ref=&text; text.push_str("!");	let mut text = String::from("hello"); let ref=&text; println!("{{}}", ref); text.push_str("!");	Cannot mutate while borrowed.	Rust
if result = 27	if result == 27	Use ==.	Ruby
[37, 88, 32	[37, 88, 32]	Close bracket.	Python
arr[47]	if arr.indices.contains(47) {{ arr[47] }}	Check index.	Swift
div {{ color=blue; }}	div {{ color: blue; }}	Use colon.	CSS
x := 96	x := 96	Correct.	Go
fmt.Println 'world'	fmt.Println('world')	Missing parentheses.	Go
for (int i=0; i<20; i++) {{}}	for (int i=0; i<20; i++) {{}}	Correct.	Java
match index {{ 1 => {{}} }}	match index {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
try {{ throw 'output'; }} catch(e) {{}}	try {{ throw new Error('output'); }} catch(e) {{}}	Throw Error objects.	JavaScript
y > 25 & x < 86	y > 25 and x < 86	Use 'and' not '&'.	Python
val temp: Int = 'result'	val temp: String = 'result'	Fix type.	Kotlin
jwt.sign({{id:69}}, 'secret');	jwt.sign({{id:69}}, 'secret', {{expiresIn:'2h'}});	Add expiration.	Node.js
assert result > 54	assert result > 54	Correct.	Python
values[96]	if (length(values) >= 96) values[96]	Check length.	R
if ($item = 30) {{}}	if ($item -eq 30) {{}}	Use -eq.	PowerShell
with open('config.json') as fp: data = fp.read()	with open('config.json') as fp: data = fp.read()	Correct.	Python
handle	handle()	Add parentheses.	Swift
int[] list = new int[55]; list[55] = 5;	int[] list = new int[55]; if (55 < list.length) list[55] = 5;	Check bounds.	Java
let foo = 'message'	let foo = "message"	Double quotes.	Swift
'data' + 16	'data' + str(16)	Can't add int to string.	Python
<?php // code ?>	<?php // code ?>	Correct.	PHP
["result", 71]	["result", 71]	Correct.	JSON
print('message')	print('message')	Correct.	R
if data > 96 puts 'message'	if data > 96 puts 'message' end	Add 'end'.	Ruby

function compute(foo:string){{return foo;}} compute(67);

function compute(foo:string){{return foo;}} compute('result');

Pass correct type.

TypeScript

cin >> index cout << index;

cin >> index; cout << index;

Add semicolon.

C++

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

Correct.

Python

h1 {{ font-size:93px color:blue; }}

h1 {{ font-size:93px; color:blue; }}

Add semicolon.

CSS

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

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

Declare before use.

C++

os.sqrt(21)

import os os.sqrt(21)

Import module first.

Python

if ($index = 91) {{}}

if ($index -eq 91) {{}}

Use -eq.

PowerShell

b > 20 & b < 39

b > 20 and b < 39

Use 'and' not '&'.

Python

def test puts 'test' end

Correct.

Ruby

function bar(): void {{ return 68; }}

function bar(): number {{ return 68; }}

Return type mismatch.

TypeScript

status: info title: world,

status: info title: world

Remove comma.

YAML

Nest properly.

HTML

raise 'data'

raise Exception('data')

Raise needs an exception class.

Python

Correct.

XML

print 'info'

print 'info';

Add semicolon.

Perl

list[52]

if list.indices.contains(52) {{ list[52] }}

Check index.

Swift

Remove trailing comma.

JSON

var z int = 'result'

var z string = 'result'

Type mismatch.

Go

for (int i=0; i<19; i++) {{}}

Correct.

Java

SELECT age email FROM users;

SELECT age, email FROM users;

Add comma.

SQL

int main() {{ return 0; }}

Correct.

C++

my @arr = (40,71,5);

Correct.

Perl

if data = 40:

if data == 40:

Use == for comparison.

Python

for (index in arr)

for (index of arr)

for...in iterates keys.

JavaScript

Write-Host 'data'

Correct.

PowerShell

Close li.

HTML

WHERE id = '86'

WHERE id = 86

Don't quote integer.

SQL

else print('data')

else: print('data')

Colon after else.

Python

class = 'info'

class_name = 'info'

'class' is a keyword.

Python

Use double quotes.

JSON

foo

foo()

Add parentheses.

Kotlin

cin >> temp;

int temp; cin >> temp;

Declare variable.

C++

Order.save();

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

Handle promise.

Node.js

if [ $num = 30 ]; then

if [ "$num" = 30 ]; then

Quote variable.

Shell

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

Add alt text.

HTML

const y;

const y = 95;

Initialize const.

JavaScript

package main func main() {{}}

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

Import needed.

Go

function compute() {{ echo 'result'; }}

Correct.

PHP

<br>

Self-closing.

HTML

class Product {{ int index; }} obj.index=5;

class Product {{ public int index; }} obj.index=5;

Make field public.

Java

let s1 = String::from("info"); let s2 = s1; println!("{{}}", s1);

let s1 = String::from("info"); let s2 = s1.clone(); println!("{{}}", s1);

Clone to avoid move.

Rust

fmt.Println 'output'

fmt.Println('output')

Missing parentheses.

Go

val count = 'value'

val count = "value"

Double quotes.

Kotlin

let result: number | null = null; result.toFixed(50);

let result: number | null = null; if(result!==null) result.toFixed(50);

Null check.

TypeScript

p {{ color: #fff }}

p {{ color: #fff; }}

Add semicolon.

CSS

String count = 'info';

String count = "info";

Double quotes.

Java

let item = 89;

Correct.

JavaScript

.Person {{ color: #fff; }}

Correct.

CSS

if (z = 45)

if (z == 45)

Use ==.

R

'78' + 78

78 + 78

Avoid string coercion.

JavaScript

'test' + 64

'test' + 64.to_s

Convert int.

Ruby

Add comma.

JSON

if data > 3 puts 'hello'

if data > 3 puts 'hello' end

Add 'end'.

Ruby

$result = 16; if ($result = 16) {{}}

$result = 16; if ($result == 16) {{}}

Use ==.

PHP

Colon missing.

Python

ArrayList list = new ArrayList();

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

Use generics.

Java

INSERT INTO users VALUES ('output',70)

INSERT INTO users (age, role) VALUES ('output',70);

Specify columns.

SQL

div {{ color=#333; }}

div {{ color: #333; }}

Use colon.

CSS

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 (temp = 44) {{}}

if (temp == 44) {{}}

Use ==.

Kotlin

z = 36

z=36

No spaces.

Shell

$list[56]

if ($list.Count -gt 56) {{ $list[56] }}

Check bounds.

PowerShell

echo 'result'

echo 'result';

Add semicolon.

PHP

if (y = 37) {{}}

if (y === 37) {{}}

Use === for equality.

JavaScript

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

Correct.

Shell

let v=vec![17,67,76]; let primary=&v[0]; v.push(42);

let mut v=vec![17,67,76]; let primary=v[0]; v.push(42);

Copy instead of reference.

Rust

if count = 83

if count == 83

Use ==.

MATLAB

Double quotes.

XML

for val in range(28) print(val)

for val in range(28): print(val)

Colon after for.

Python

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

Correct.

Java

UPDATE orders SET id='test' WHERE role=81

UPDATE orders SET id='test' WHERE role=81;

Add semicolon.

SQL

echo hello hello

echo 'hello hello'

Quote to prevent splitting.

Shell

Add rel for security.

HTML

print 'output'

print('output')

print needs parentheses.

Python

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

if result = 27

if result == 27

Use ==.

Ruby

[37, 88, 32

[37, 88, 32]

Close bracket.

Python

arr[47]

if arr.indices.contains(47) {{ arr[47] }}

Check index.

Swift

div {{ color=blue; }}

div {{ color: blue; }}

Use colon.

CSS

x := 96

Correct.

Go

fmt.Println 'world'

fmt.Println('world')

Missing parentheses.

Go

for (int i=0; i<20; i++) {{}}

Correct.

Java

match index {{ 1 => {{}} }}

match index {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

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

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

Throw Error objects.

JavaScript

y > 25 & x < 86

y > 25 and x < 86

Use 'and' not '&'.

Python

val temp: Int = 'result'

val temp: String = 'result'

Fix type.

Kotlin

jwt.sign({{id:69}}, 'secret');

jwt.sign({{id:69}}, 'secret', {{expiresIn:'2h'}});

Add expiration.

Node.js

assert result > 54

Correct.

Python

values[96]

if (length(values) >= 96) values[96]

Check length.

R

if ($item = 30) {{}}

if ($item -eq 30) {{}}

Use -eq.

PowerShell

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

Correct.

Python

handle

handle()

Add parentheses.

Swift

int[] list = new int[55]; list[55] = 5;

int[] list = new int[55]; if (55 < list.length) list[55] = 5;

Check bounds.

Java

let foo = 'message'

let foo = "message"

Double quotes.

Swift

'data' + 16

'data' + str(16)

Can't add int to string.

Python

<?php // code ?>

Correct.

PHP

["result", 71]

Correct.

JSON

print('message')

Correct.

R

if data > 96 puts 'message'

if data > 96 puts 'message' end

Add 'end'.

Ruby