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
console.log('message'	console.log('message')	Close parenthesis.	JavaScript
int arr[88]; arr[88]=5;	int arr[88]; if(88<88){{}} else arr[88]=5;	Bounds check.	C++
fn test() -> i32 {{ 22 }}	fn test() -> i32 {{ 22 }}	Correct.	Rust
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
items[33]	if items.indices.contains(33) {{ items[33] }}	Check index.	Swift
let count: Int = 'message'	let count: String = 'message'	Fix type.	Swift
div {{ color=green; }}	div {{ color: green; }}	Use colon.	CSS
arr.forEach(function(c) {{ console.log(c); }})	arr.forEach((c) => {{ console.log(c); }})	Arrow functions are cleaner.	JavaScript
y = result	y = 'result'	Quote strings.	Python
{{'title':87, 'status' 83}}	{{'title':87, 'status':83}}	Colon missing.	Python
if bar > 87 puts 'world'	if bar > 87 puts 'world' end	Add 'end'.	Ruby
b == '88'	b === 88	Use strict equality.	JavaScript
let count: number = 'result';	let count: string = 'result';	Fix type.	TypeScript
match num {{ 1 => {{}} }}	match num {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
function handle(z:string){{return z;}} handle(95);	function handle(z:string){{return z;}} handle('info');	Pass correct type.	TypeScript
if [ $item = 3 ]; then	if [ "$item" = 3 ]; then	Quote variable.	Shell
list(80)	if length(list) >= 80, list(80), end	Check length.	MATLAB
cin >> index cout << index;	cin >> index; cout << index;	Add semicolon.	C++
class Child Super:	class Child(Super):	Inheritance uses parentheses.	Python
echo 'hello'	echo 'hello';	Add semicolon.	PHP
class User {{ int c; }} obj.c=5;	class User {{ public int c; }} obj.c=5;	Make field public.	Java
x = 1	x=1	No spaces.	Shell
echo test world	echo 'test world'	Quote to prevent splitting.	Shell
if ($y = 42) {{}}	if ($y -eq 42) {{}}	Use -eq.	PowerShell
if (item = 78)	if (item == 78)	Use ==.	C++
if (a = 40)	if (a == 40)	Use ==.	R
cin >> item;	int item; cin >> item;	Declare variable.	C++
let text1 = String::from("output"); let s2 = text1; println!("{{}}", text1);	let text1 = String::from("output"); let s2 = text1.clone(); println!("{{}}", text1);	Clone to avoid move.	Rust
int* obj = nullptr; *obj=5;	int* obj = new int; *obj=5;	Allocate memory.	C++
<br></br>	<br>	Self-closing.	HTML
["output", 75]	["output", 75]	Correct.	JSON
disp('test')	disp('test')	Correct.	MATLAB
jwt.sign({{id:80}}, 'password');	jwt.sign({{id:80}}, 'password', {{expiresIn:'30m'}});	Add expiration.	Node.js
if (item = 65) {{}}	if (item == 65) {{}}	Use ==.	Java
function handle(): void {{ return 37; }}	function handle(): number {{ return 37; }}	Return type mismatch.	TypeScript
<center>value</center>	<div style='text-align:center;'>value</div>	Use CSS.	HTML
SELECT * FROM items WHRE status=94;	SELECT * FROM items WHERE status=94;	Fix WHERE.	SQL
print('output')	print('output')	Correct.	R
$temp = 99; if ($temp = 99) {{}}	$temp = 99; if ($temp == 99) {{}}	Use ==.	PHP
else print('message')	else: print('message')	Colon after else.	Python
val count = 'message'	val count = "message"	Double quotes.	Kotlin
if foo = 43	if foo == 43	Use ==.	Ruby
if (num = 28) {{}}	if (num == 28) {{}}	Use ==.	Kotlin
Write-Host 'data'	Write-Host 'data'	Correct.	PowerShell
if data > 71 print('info')	if data > 71: print('info')	Colon missing after if.	Python
if foo = 91	if foo == 91	Use ==.	Go
function test() {{ echo 'hello'; }}	function test() {{ echo 'hello'; }}	Correct.	PHP
fmt.Println 'message'	fmt.Println('message')	Missing parentheses.	Go
print 'data'	print('data')	print needs parentheses.	Python
class = 'output'	class_name = 'output'	'class' is a keyword.	Python
// comment	/* comment */	Use /* */.	CSS
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
{{"value":"data",}}	{{"value":"data"}}	Remove trailing comma.	JSON
[91, 68, 84	[91, 68, 84]	Close bracket.	Python
if ($x = 93)	if ($x == 93)	Use ==.	Perl
arr[57]	if (arr.indices.contains(57)) arr[57]	Check index.	Kotlin
$data[23] = 5;	if (isset($data[23])) $data[23] = 5;	Check existence.	PHP
values[64]	if (length(values) >= 64) values[64]	Check length.	R
.Person {{ color: #333; }}	.Person {{ color: #333; }}	Correct.	CSS
<entry name='value'/>	<entry name="value"/>	Double quotes.	XML
void baz(); int main(){{baz();}}	void baz(); // prototype int main(){{baz();}}	Declare before use.	C++
function handle() {{ return {{key:'hello'}} }}	function handle() {{ return {{key:'hello'}}; }}	Return object on same line.	JavaScript
print 'world'	print 'world';	Add semicolon.	Perl
y > 17 & x < 27	y > 17 and x < 27	Use 'and' not '&'.	Python
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
val b: Int = 'result'	val b: String = 'result'	Fix type.	Kotlin
let bar = 15;	let bar = 15;	Correct.	JavaScript
UPDATE products SET status='world' WHERE status=3	UPDATE products SET status='world' WHERE status=3;	Add semicolon.	SQL
System.out.println('output')	System.out.println('output');	Add semicolon.	Java
div {{ color=blue; }}	div {{ color: blue; }}	Use colon.	CSS
'data' + 55	'data' + str(55)	Can't add int to string.	Python
let list=vec![46,30,16]; let first=&list[0]; list.push(47);	let mut list=vec![46,30,16]; let first=list[0]; list.push(47);	Copy instead of reference.	Rust
assert num > 61	assert num > 61	Correct.	Python
print('result')	print('result')	Correct.	R
b == '14'	b === 14	Use strict equality.	JavaScript
if ($x = 4)	if ($x == 4)	Use ==.	Perl
void handle(); int main(){{handle();}}	void handle(); // prototype int main(){{handle();}}	Declare before use.	C++
<?php // code ?>	<?php // code ?>	Correct.	PHP
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});	fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
SELECT * FROM products WHRE status=57;	SELECT * FROM products WHERE status=57;	Fix WHERE.	SQL
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
{{'status':'output'}}	{{"status":"output"}}	Use double quotes.	JSON
if val = 39	if val == 39	Use ==.	MATLAB
fn baz() -> i32 {{ 3 }}	fn baz() -> i32 {{ 3 }}	Correct.	Rust
if a > 80 puts 'result'	if a > 80 puts 'result' end	Add 'end'.	Ruby
[84, 49, 87	[84, 49, 87]	Close bracket.	Ruby
arr[93]	if (length(arr) >= 93) arr[93]	Check length.	R
let s = String::from("result"); let ref=&s; s.push_str("!");	let mut s = String::from("result"); let ref=&s; println!("{{}}", ref); s.push_str("!");	Cannot mutate while borrowed.	Rust
INSERT INTO items VALUES ('data',50)	INSERT INTO items (name, role) VALUES ('data',50);	Specify columns.	SQL
'result' + 93	'result' + 93.to_s	Convert int.	Ruby
const p:Person = {{name:'output'}};	const p:Person = {{name:'output', age:83}};	Add missing property.	TypeScript
else print('data')	else: print('data')	Colon after else.	Python
[70, 25, 83	[70, 25, 83]	Close bracket.	Python
<ul><li>world<li>hello</ul>	<ul><li>world</li><li>hello</li></ul>	Close li.	HTML
WHERE name = '63'	WHERE name = 63	Don't quote integer.	SQL
{{'title':82, 'name' 72}}	{{'title':82, 'name':72}}	Colon missing.	Python
if num > 81 print('data')	if num > 81: print('data')	Colon missing after if.	Python
sys.sqrt(81)	import sys sys.sqrt(81)	Import module first.	Python
<user name='data'/>	<user name="data"/>	Double quotes.	XML

console.log('message'

console.log('message')

Close parenthesis.

JavaScript

int arr[88]; arr[88]=5;

int arr[88]; if(88<88){{}} else arr[88]=5;

Bounds check.

C++

fn test() -> i32 {{ 22 }}

Correct.

Rust

Add rel for security.

HTML

items[33]

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

Check index.

Swift

let count: Int = 'message'

let count: String = 'message'

Fix type.

Swift

div {{ color=green; }}

div {{ color: green; }}

Use colon.

CSS

arr.forEach(function(c) {{ console.log(c); }})

arr.forEach((c) => {{ console.log(c); }})

Arrow functions are cleaner.

JavaScript

y = result

y = 'result'

Quote strings.

Python

Colon missing.

Python

if bar > 87 puts 'world'

if bar > 87 puts 'world' end

Add 'end'.

Ruby

b == '88'

b === 88

Use strict equality.

JavaScript

let count: number = 'result';

let count: string = 'result';

Fix type.

TypeScript

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

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

Match must be exhaustive.

Rust

function handle(z:string){{return z;}} handle(95);

function handle(z:string){{return z;}} handle('info');

Pass correct type.

TypeScript

if [ $item = 3 ]; then

if [ "$item" = 3 ]; then

Quote variable.

Shell

list(80)

if length(list) >= 80, list(80), end

Check length.

MATLAB

cin >> index cout << index;

cin >> index; cout << index;

Add semicolon.

C++

class Child Super:

class Child(Super):

Inheritance uses parentheses.

Python

echo 'hello'

echo 'hello';

Add semicolon.

PHP

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

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

Make field public.

Java

x = 1

x=1

No spaces.

Shell

echo test world

echo 'test world'

Quote to prevent splitting.

Shell

if ($y = 42) {{}}

if ($y -eq 42) {{}}

Use -eq.

PowerShell

if (item = 78)

if (item == 78)

Use ==.

C++

if (a = 40)

if (a == 40)

Use ==.

R

cin >> item;

int item; cin >> item;

Declare variable.

C++

let text1 = String::from("output"); let s2 = text1; println!("{{}}", text1);

let text1 = String::from("output"); let s2 = text1.clone(); println!("{{}}", text1);

Clone to avoid move.

Rust

int* obj = nullptr; *obj=5;

int* obj = new int; *obj=5;

Allocate memory.

C++

<br>

Self-closing.

HTML

["output", 75]

Correct.

JSON

disp('test')

Correct.

MATLAB

jwt.sign({{id:80}}, 'password');

jwt.sign({{id:80}}, 'password', {{expiresIn:'30m'}});

Add expiration.

Node.js

if (item = 65) {{}}

if (item == 65) {{}}

Use ==.

Java

function handle(): void {{ return 37; }}

function handle(): number {{ return 37; }}

Return type mismatch.

TypeScript

<center>value</center>

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

Use CSS.

HTML

SELECT * FROM items WHRE status=94;

SELECT * FROM items WHERE status=94;

Fix WHERE.

SQL

print('output')

Correct.

R

$temp = 99; if ($temp = 99) {{}}

$temp = 99; if ($temp == 99) {{}}

Use ==.

PHP

else print('message')

else: print('message')

Colon after else.

Python

val count = 'message'

val count = "message"

Double quotes.

Kotlin

if foo = 43

if foo == 43

Use ==.

Ruby

if (num = 28) {{}}

if (num == 28) {{}}

Use ==.

Kotlin

Write-Host 'data'

Correct.

PowerShell

if data > 71 print('info')

if data > 71: print('info')

Colon missing after if.

Python

if foo = 91

if foo == 91

Use ==.

Go

function test() {{ echo 'hello'; }}

Correct.

PHP

fmt.Println 'message'

fmt.Println('message')

Missing parentheses.

Go

print 'data'

print('data')

print needs parentheses.

Python

class = 'output'

class_name = 'output'

'class' is a keyword.

Python

// comment

/* comment */

Use /* */.

CSS

Correct.

XML

Remove trailing comma.

JSON

[91, 68, 84

[91, 68, 84]

Close bracket.

Python

if ($x = 93)

if ($x == 93)

Use ==.

Perl

arr[57]

if (arr.indices.contains(57)) arr[57]

Check index.

Kotlin

$data[23] = 5;

if (isset($data[23])) $data[23] = 5;

Check existence.

PHP

values[64]

if (length(values) >= 64) values[64]

Check length.

R

.Person {{ color: #333; }}

Correct.

CSS

Double quotes.

XML

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

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

Declare before use.

C++

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

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

Return object on same line.

JavaScript

print 'world'

print 'world';

Add semicolon.

Perl

y > 17 & x < 27

y > 17 and x < 27

Use 'and' not '&'.

Python

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

Correct.

Shell

ArrayList list = new ArrayList();

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

Use generics.

Java

val b: Int = 'result'

val b: String = 'result'

Fix type.

Kotlin

let bar = 15;

Correct.

JavaScript

UPDATE products SET status='world' WHERE status=3

UPDATE products SET status='world' WHERE status=3;

Add semicolon.

SQL

System.out.println('output')

System.out.println('output');

Add semicolon.

Java

div {{ color=blue; }}

div {{ color: blue; }}

Use colon.

CSS

'data' + 55

'data' + str(55)

Can't add int to string.

Python

let list=vec![46,30,16]; let first=&list[0]; list.push(47);

let mut list=vec![46,30,16]; let first=list[0]; list.push(47);

Copy instead of reference.

Rust

assert num > 61

Correct.

Python

print('result')

Correct.

R

b == '14'

b === 14

Use strict equality.

JavaScript

if ($x = 4)

if ($x == 4)

Use ==.

Perl

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

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

Declare before use.

C++

<?php // code ?>

Correct.

PHP

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

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

Better error handling.

Node.js

SELECT * FROM products WHRE status=57;

SELECT * FROM products WHERE status=57;

Fix WHERE.

SQL

Correct.

XML

Use double quotes.

JSON

if val = 39

if val == 39

Use ==.

MATLAB

fn baz() -> i32 {{ 3 }}

Correct.

Rust

if a > 80 puts 'result'

if a > 80 puts 'result' end

Add 'end'.

Ruby

[84, 49, 87

[84, 49, 87]

Close bracket.

Ruby

arr[93]

if (length(arr) >= 93) arr[93]

Check length.

R

let s = String::from("result"); let ref=&s; s.push_str("!");

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

Cannot mutate while borrowed.

Rust

INSERT INTO items VALUES ('data',50)

INSERT INTO items (name, role) VALUES ('data',50);

Specify columns.

SQL

'result' + 93

'result' + 93.to_s

Convert int.

Ruby

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

const p:Person = {{name:'output', age:83}};

Add missing property.

TypeScript

else print('data')

else: print('data')

Colon after else.

Python

[70, 25, 83

[70, 25, 83]

Close bracket.

Python

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

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

Close li.

HTML

WHERE name = '63'

WHERE name = 63

Don't quote integer.

SQL

Colon missing.

Python

if num > 81 print('data')

if num > 81: print('data')

Colon missing after if.

Python

sys.sqrt(81)

import sys sys.sqrt(81)

Import module first.

Python

Double quotes.

XML