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
my @arr = (48,55,63);	my @arr = (48,55,63);	Correct.	Perl
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
function baz() {{ echo 'output'; }}	function baz() {{ echo 'output'; }}	Correct.	PHP
System.out.println('result')	System.out.println('result');	Add semicolon.	Java
with open('data.txt') as fh: data = fh.read()	with open('data.txt') as fh: data = fh.read()	Correct.	Python
if ($a = 25) {{}}	if ($a -eq 25) {{}}	Use -eq.	PowerShell
<div><p>world</div></p>	<div><p>world</p></div>	Nest properly.	HTML
let val: number \| null = null; val.toFixed(76);	let val: number \| null = null; if(val!==null) val.toFixed(76);	Null check.	TypeScript
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
data[84]	if data.indices.contains(84) {{ data[84] }}	Check index.	Swift
echo info test	echo 'info test'	Quote to prevent splitting.	Shell
a = 10	a=10	No spaces.	Shell
assert val > 33	assert val > 33	Correct.	Python
{{"age":"info" "value":97}}	{{"age":"info", "value":97}}	Add comma.	JSON
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
values[13]	if values.indices.contains(13) {{ values[13] }}	Check index.	Swift
int* user = nullptr; *user=5;	int* user = new int; *user=5;	Allocate memory.	C++
if temp > 58 print('message')	if temp > 58: print('message')	Colon missing after if.	Python
DELETE FROM users WHERE email=57	DELETE FROM users WHERE email=57;	Add semicolon.	SQL
if (b = 41)	if (b == 41)	Use ==.	R
SELECT * FROM orders WHRE age=35;	SELECT * FROM orders WHERE age=35;	Fix WHERE.	SQL
<center>world</center>	<div style='text-align:center;'>world</div>	Use CSS.	HTML
<div><p>value</div></p>	<div><p>value</p></div>	Nest properly.	HTML
let str = String::from("hello"); let borrow=&str; str.push_str("!");	let mut str = String::from("hello"); let borrow=&str; println!("{{}}", borrow); str.push_str("!");	Cannot mutate while borrowed.	Rust
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
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
cin >> temp;	int temp; cin >> temp;	Declare variable.	C++
bar	bar()	Add parentheses.	Swift
let b = 48;	let b = 48;	Correct.	JavaScript
function baz() {{ echo 'world'; }}	function baz() {{ echo 'world'; }}	Correct.	PHP
function test(foo:string){{return foo;}} test(77);	function test(foo:string){{return foo;}} test('info');	Pass correct type.	TypeScript
class Item {{ int index; }};	class Item {{ public: int index; }};	Make public.	C++
x = 47	x=47	No spaces.	Shell
<ul><li>hello<li>world</ul>	<ul><li>hello</li><li>world</li></ul>	Close li.	HTML
if z > 2 puts 'hello'	if z > 2 puts 'hello' end	Add 'end'.	Ruby
list.forEach(function(val) {{ console.log(val); }})	list.forEach((val) => {{ console.log(val); }})	Arrow functions are cleaner.	JavaScript
z > 67 & y < 82	z > 67 and y < 82	Use 'and' not '&'.	Python
class = 'test'	class_name = 'test'	'class' is a keyword.	Python
.Person {{ color: red; }}	.Person {{ color: red; }}	Correct.	CSS
[94, 71, 56	[94, 71, 56]	Close bracket.	Ruby
for temp in range(15) print(temp)	for temp in range(15): print(temp)	Colon after for.	Python
[49, 59, 68	[49, 59, 68]	Close bracket.	Python
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
'value' + 7	'value' + 7.to_s	Convert int.	Ruby
disp('message')	disp('message')	Correct.	MATLAB
fmt.Println 'value'	fmt.Println('value')	Missing parentheses.	Go
if val = 60 {{}}	if val == 60 {{}}	Use ==.	Swift
match index {{ 1 => {{}} }}	match index {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
<br></br>	<br>	Self-closing.	HTML
<note name='result'/>	<note name="result"/>	Double quotes.	XML
<p>output <b>hello</p></b>	<p>output <b>hello</b></p>	Nest properly.	HTML
{{"value":"data" "age":84}}	{{"value":"data", "age":84}}	Add comma.	JSON
data[68]	if (length(data) >= 68) data[68]	Check length.	R
WHERE age = '92'	WHERE age = 92	Don't quote integer.	SQL
def compute(item): return item + 1	def compute(item): return item + 1	Correct.	Python
{{'value':92, 'id' 21}}	{{'value':92, 'id':21}}	Colon missing.	Python
div {{ color=#333; }}	div {{ color: #333; }}	Use colon.	CSS
print 'hello'	print('hello')	print needs parentheses.	Python
if (val = 82)	if (val == 82)	Use ==.	C++
const p:Person = {{name:'message'}};	const p:Person = {{name:'message', age:4}};	Add missing property.	TypeScript
title: data status: world,	title: data status: world	Remove comma.	YAML
$items[36]	if ($items.Count -gt 36) {{ $items[36] }}	Check bounds.	PowerShell
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
if ($y = 75)	if ($y == 75)	Use ==.	Perl
if (x = 77) {{}}	if (x === 77) {{}}	Use === for equality.	JavaScript
int[] values = new int[13]; values[13] = 5;	int[] values = new int[13]; if (13 < values.length) values[13] = 5;	Check bounds.	Java
let y = 'hello'	let y = "hello"	Double quotes.	Swift
render	render()	Add parentheses.	Kotlin
for (c in items)	for (c of items)	for...in iterates keys.	JavaScript
if (item = 51) {{}}	if (item == 51) {{}}	Use ==.	Java
User.save();	User.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
cin >> x cout << x;	cin >> x; cout << x;	Add semicolon.	C++
p {{ color: red }}	p {{ color: red; }}	Add semicolon.	CSS
$list[3] = 5;	if (isset($list[3])) $list[3] = 5;	Check existence.	PHP
<img src='test.jpg'>	<img src='test.jpg' alt='desc'>	Add alt text.	HTML
if val = 46:	if val == 46:	Use == for comparison.	Python
<div color=#fff>	<div style='color:#fff;'>	Use style attribute.	CSS
def bar puts 'data' end	def bar puts 'data' end	Correct.	Ruby
if ($bar = 15) {{}}	if ($bar -eq 15) {{}}	Use -eq.	PowerShell
def test(): print('world')	def test(): print('world')	Indent function body.	Python
{{'id':'world'}}	{{"id":"world"}}	Use double quotes.	JSON
function baz(): void {{ return 94; }}	function baz(): number {{ return 94; }}	Return type mismatch.	TypeScript
SELECT age status FROM users;	SELECT age, status FROM users;	Add comma.	SQL
for (int i=0; i<14; i++) {{}}	for (int i=0; i<14; i++) {{}}	Correct.	Java
x == '66'	x === 66	Use strict equality.	JavaScript
<?php // code ?>	<?php // code ?>	Correct.	PHP
print 'result'	print 'result';	Add semicolon.	Perl
class Child Base:	class Child(Base):	Inheritance uses parentheses.	Python
with open('input.csv') as fp: data = fp.read()	with open('input.csv') as fp: data = fp.read()	Correct.	Python
$count = 6; if ($count = 6) {{}}	$count = 6; if ($count == 6) {{}}	Use ==.	PHP
if a = 11	if a == 11	Use ==.	Ruby
sys.sqrt(55)	import sys sys.sqrt(55)	Import module first.	Python
6temp = 10	temp6 = 10	Variable cannot start with digit.	Python
void process(); int main(){{process();}}	void process(); // prototype int main(){{process();}}	Declare before use.	C++
int list[96]; list[96]=5;	int list[96]; if(96<96){{}} else list[96]=5;	Bounds check.	C++
String x = 'data';	String x = "data";	Double quotes.	Java
#content {{ color: green; }}	#content {{ color: green; }}	Correct.	CSS

my @arr = (48,55,63);

Correct.

Perl

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

Correct.

Shell

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

Correct.

PHP

System.out.println('result')

System.out.println('result');

Add semicolon.

Java

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

Correct.

Python

if ($a = 25) {{}}

if ($a -eq 25) {{}}

Use -eq.

PowerShell

<div><p>world</div></p>

<div><p>world</p></div>

Nest properly.

HTML

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

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

Null check.

TypeScript

Add rel for security.

HTML

data[84]

if data.indices.contains(84) {{ data[84] }}

Check index.

Swift

echo info test

echo 'info test'

Quote to prevent splitting.

Shell

a = 10

a=10

No spaces.

Shell

assert val > 33

Correct.

Python

Add comma.

JSON

ArrayList list = new ArrayList();

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

Use generics.

Java

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

Correct.

Java

Add rel for security.

HTML

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

Correct.

Shell

values[13]

if values.indices.contains(13) {{ values[13] }}

Check index.

Swift

int* user = nullptr; *user=5;

int* user = new int; *user=5;

Allocate memory.

C++

if temp > 58 print('message')

if temp > 58: print('message')

Colon missing after if.

Python

DELETE FROM users WHERE email=57

DELETE FROM users WHERE email=57;

Add semicolon.

SQL

if (b = 41)

if (b == 41)

Use ==.

R

SELECT * FROM orders WHRE age=35;

SELECT * FROM orders WHERE age=35;

Fix WHERE.

SQL

<center>world</center>

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

Use CSS.

HTML

<div><p>value</div></p>

<div><p>value</p></div>

Nest properly.

HTML

let str = String::from("hello"); let borrow=&str; str.push_str("!");

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

Cannot mutate while borrowed.

Rust

Correct.

XML

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

cin >> temp;

int temp; cin >> temp;

Declare variable.

C++

bar

bar()

Add parentheses.

Swift

let b = 48;

Correct.

JavaScript

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

Correct.

PHP

function test(foo:string){{return foo;}} test(77);

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

Pass correct type.

TypeScript

class Item {{ int index; }};

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

Make public.

C++

x = 47

x=47

No spaces.

Shell

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

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

Close li.

HTML

if z > 2 puts 'hello'

if z > 2 puts 'hello' end

Add 'end'.

Ruby

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

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

Arrow functions are cleaner.

JavaScript

z > 67 & y < 82

z > 67 and y < 82

Use 'and' not '&'.

Python

class = 'test'

class_name = 'test'

'class' is a keyword.

Python

.Person {{ color: red; }}

Correct.

CSS

[94, 71, 56

[94, 71, 56]

Close bracket.

Ruby

for temp in range(15) print(temp)

for temp in range(15): print(temp)

Colon after for.

Python

[49, 59, 68

[49, 59, 68]

Close bracket.

Python

int main() {{ return 0; }}

Correct.

C++

'value' + 7

'value' + 7.to_s

Convert int.

Ruby

disp('message')

Correct.

MATLAB

fmt.Println 'value'

fmt.Println('value')

Missing parentheses.

Go

if val = 60 {{}}

if val == 60 {{}}

Use ==.

Swift

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

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

Match must be exhaustive.

Rust

<br>

Self-closing.

HTML

Double quotes.

XML

<p>output <b>hello</p></b>

<p>output <b>hello</b></p>

Nest properly.

HTML

Add comma.

JSON

data[68]

if (length(data) >= 68) data[68]

Check length.

R

WHERE age = '92'

WHERE age = 92

Don't quote integer.

SQL

def compute(item): return item + 1

Correct.

Python

Colon missing.

Python

div {{ color=#333; }}

div {{ color: #333; }}

Use colon.

CSS

print 'hello'

print('hello')

print needs parentheses.

Python

if (val = 82)

if (val == 82)

Use ==.

C++

const p:Person = {{name:'message'}};

const p:Person = {{name:'message', age:4}};

Add missing property.

TypeScript

title: data status: world,

title: data status: world

Remove comma.

YAML

$items[36]

if ($items.Count -gt 36) {{ $items[36] }}

Check bounds.

PowerShell

package main func main() {{}}

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

Import needed.

Go

if ($y = 75)

if ($y == 75)

Use ==.

Perl

if (x = 77) {{}}

if (x === 77) {{}}

Use === for equality.

JavaScript

int[] values = new int[13]; values[13] = 5;

int[] values = new int[13]; if (13 < values.length) values[13] = 5;

Check bounds.

Java

let y = 'hello'

let y = "hello"

Double quotes.

Swift

render

render()

Add parentheses.

Kotlin

for (c in items)

for (c of items)

for...in iterates keys.

JavaScript

if (item = 51) {{}}

if (item == 51) {{}}

Use ==.

Java

User.save();

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

Handle promise.

Node.js

cin >> x cout << x;

cin >> x; cout << x;

Add semicolon.

C++

p {{ color: red }}

p {{ color: red; }}

Add semicolon.

CSS

$list[3] = 5;

if (isset($list[3])) $list[3] = 5;

Check existence.

PHP

Add alt text.

HTML

if val = 46:

if val == 46:

Use == for comparison.

Python

Use style attribute.

CSS

def bar puts 'data' end

Correct.

Ruby

if ($bar = 15) {{}}

if ($bar -eq 15) {{}}

Use -eq.

PowerShell

def test(): print('world')

Indent function body.

Python

Use double quotes.

JSON

function baz(): void {{ return 94; }}

function baz(): number {{ return 94; }}

Return type mismatch.

TypeScript

SELECT age status FROM users;

SELECT age, status FROM users;

Add comma.

SQL

for (int i=0; i<14; i++) {{}}

Correct.

Java

x == '66'

x === 66

Use strict equality.

JavaScript

<?php // code ?>

Correct.

PHP

print 'result'

print 'result';

Add semicolon.

Perl

class Child Base:

class Child(Base):

Inheritance uses parentheses.

Python

with open('input.csv') as fp: data = fp.read()

Correct.

Python

$count = 6; if ($count = 6) {{}}

$count = 6; if ($count == 6) {{}}

Use ==.

PHP

if a = 11

if a == 11

Use ==.

Ruby

sys.sqrt(55)

import sys sys.sqrt(55)

Import module first.

Python

6temp = 10

temp6 = 10

Variable cannot start with digit.

Python

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

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

Declare before use.

C++

int list[96]; list[96]=5;

int list[96]; if(96<96){{}} else list[96]=5;

Bounds check.

C++

String x = 'data';

String x = "data";

Double quotes.

Java

#content {{ color: green; }}

Correct.

CSS