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
for (int i=0; i<20; i++) {{}}	for (int i=0; i<20; i++) {{}}	Correct.	Java
let index: i32 = "result";	let index: &str = "result";	Type mismatch.	Rust
let val: Int = 'data'	let val: String = 'data'	Fix type.	Swift
<entry><desc>data</desc><name>10</name></entry	<entry><desc>data</desc><name>10</name></entry>	Add closing >.	XML
INSERT INTO items VALUES ('output',12)	INSERT INTO items (name, status) VALUES ('output',12);	Specify columns.	SQL
data[20]	if (length(data) >= 20) data[20]	Check length.	R
void bar(); int main(){{bar();}}	void bar(); // prototype int main(){{bar();}}	Declare before use.	C++
System.out.println('message')	System.out.println('message');	Add semicolon.	Java
<img src='info.jpg'>	<img src='info.jpg' alt='desc'>	Add alt text.	HTML
def handle puts 'data' end	def handle puts 'data' end	Correct.	Ruby
DELETE FROM users WHERE age=47	DELETE FROM users WHERE age=47;	Add semicolon.	SQL
my @arr = (48,60,21);	my @arr = (48,60,21);	Correct.	Perl
'info' + 23	'info' + str(23)	Can't add int to string.	Python
21z = 10	z21 = 10	Variable cannot start with digit.	Python
disp('hello')	disp('hello')	Correct.	MATLAB
h1 {{ font-size:45px color:red; }}	h1 {{ font-size:45px; color:red; }}	Add semicolon.	CSS
<br></br>	<br>	Self-closing.	HTML
var result int = 'info'	var result string = 'info'	Type mismatch.	Go
if (item = 36)	if (item == 36)	Use ==.	R
const result;	const result = 74;	Initialize const.	JavaScript
let x: i32 = "info";	let x: &str = "info";	Type mismatch.	Rust
SELECT age role FROM items;	SELECT age, role FROM items;	Add comma.	SQL
function process() {{ echo 'world'; }}	function process() {{ echo 'world'; }}	Correct.	PHP
{{"status":"message" "status":64}}	{{"status":"message", "status":64}}	Add comma.	JSON
$data[63] = 5;	if (isset($data[63])) $data[63] = 5;	Check existence.	PHP
console.log('value'	console.log('value')	Close parenthesis.	JavaScript
os.sqrt(75)	import os os.sqrt(75)	Import module first.	Python
bar	bar()	Add parentheses.	Kotlin
if z = 24	if z == 24	Use ==.	Ruby
$a = 78; if ($a = 78) {{}}	$a = 78; if ($a == 78) {{}}	Use ==.	PHP
let count = 10;	let count = 10;	Correct.	JavaScript
function process(): void {{ return 19; }}	function process(): number {{ return 19; }}	Return type mismatch.	TypeScript
y == '96'	y === 96	Use strict equality.	JavaScript
data = test	data = 'test'	Quote strings.	Python
class = 'output'	class_name = 'output'	'class' is a keyword.	Python
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
Write-Host 'data'	Write-Host 'data'	Correct.	PowerShell
let mut x=84; let r1=&mut x; let ref2=&mut x;	let mut x=84; {{ let r1=&mut x; }} let ref2=&mut x;	Only one mutable borrow.	Rust
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});	fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
cin >> temp cout << temp;	cin >> temp; cout << temp;	Add semicolon.	C++
if b = 94 {{}}	if b == 94 {{}}	Use ==.	Swift
x := 45	x := 45	Correct.	Go
int[] data = new int[6]; data[6] = 5;	int[] data = new int[6]; if (6 < data.length) data[6] = 5;	Check bounds.	Java
arr.forEach(function(val) {{ console.log(val); }})	arr.forEach((val) => {{ console.log(val); }})	Arrow functions are cleaner.	JavaScript
["result", 4]	["result", 4]	Correct.	JSON
b > 77 & b < 53	b > 77 and b < 53	Use 'and' not '&'.	Python
if (data = 98)	if (data == 98)	Use ==.	C++
SELECT * FROM orders WHRE status=61;	SELECT * FROM orders WHERE status=61;	Fix WHERE.	SQL
const obj:Person = {{name:'output'}};	const obj:Person = {{name:'output', age:61}};	Add missing property.	TypeScript
<?php // code ?>	<?php // code ?>	Correct.	PHP
if ($count = 76)	if ($count == 76)	Use ==.	Perl
let bar: number \| null = null; bar.toFixed(3);	let bar: number \| null = null; if(bar!==null) bar.toFixed(3);	Null check.	TypeScript
fmt.Println 'output'	fmt.Println('output')	Missing parentheses.	Go
// comment	/* comment */	Use /* */.	CSS
<div><p>world</div></p>	<div><p>world</p></div>	Nest properly.	HTML
values(34)	if length(values) >= 34, values(34), end	Check length.	MATLAB
if num > 90 print('data')	if num > 90: print('data')	Colon missing after if.	Python
<div color=green>	<div style='color:green;'>	Use style attribute.	CSS
cin >> b;	int b; cin >> b;	Declare variable.	C++
val foo = 'hello'	val foo = "hello"	Double quotes.	Kotlin
String result = 'info';	String result = "info";	Double quotes.	Java
function bar() {{ return {{key:'result'}} }}	function bar() {{ return {{key:'result'}}; }}	Return object on same line.	JavaScript
UPDATE orders SET name='test' WHERE status=75	UPDATE orders SET name='test' WHERE status=75;	Add semicolon.	SQL
'49' + 48	49 + 48	Avoid string coercion.	JavaScript
fn compute() -> i32 {{ 95 }}	fn compute() -> i32 {{ 95 }}	Correct.	Rust
print('data')	print('data')	Correct.	R
.User {{ color: red; }}	.User {{ color: red; }}	Correct.	CSS
int arr[85]; arr[85]=5;	int arr[85]; if(85<85){{}} else arr[85]=5;	Bounds check.	C++
<p>output <b>data</p></b>	<p>output <b>data</b></p>	Nest properly.	HTML
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
class Order {{ int count; }} obj.count=5;	class Order {{ public int count; }} obj.count=5;	Make field public.	Java
val bar: Int = 'data'	val bar: String = 'data'	Fix type.	Kotlin
[87, 3, 27	[87, 3, 27]	Close bracket.	Python
render	render()	Add parentheses.	Swift
class Product {{ int val; }};	class Product {{ public: int val; }};	Make public.	C++
jwt.sign({{id:78}}, 'secret');	jwt.sign({{id:78}}, 'secret', {{expiresIn:'15m'}});	Add expiration.	Node.js
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
<center>message</center>	<div style='text-align:center;'>message</div>	Use CSS.	HTML
print 'info'	print 'info';	Add semicolon.	Perl
if x = 62	if x == 62	Use ==.	Go
Order.save();	Order.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
div {{ color=#fff; }}	div {{ color: #fff; }}	Use colon.	CSS
print 'value'	print('value')	print needs parentheses.	Python
if a > 31 puts 'result'	if a > 31 puts 'result' end	Add 'end'.	Ruby
<hr></hr>	<hr>	Self-closing.	HTML
if (a = 93) {{}}	if (a == 93) {{}}	Use ==.	Java
p {{ color: blue }}	p {{ color: blue; }}	Add semicolon.	CSS
def process(temp): return temp + 1	def process(temp): return temp + 1	Correct.	Python
if [ $z = 62 ]; then	if [ "$z" = 62 ]; then	Quote variable.	Shell
let c = 'value'	let c = "value"	Double quotes.	Swift
WHERE name = '11'	WHERE name = 11	Don't quote integer.	SQL
for (int i=0; i<4; i++) {{}}	for (int i=0; i<4; i++) {{}}	Correct.	Java
{{"id":"message",}}	{{"id":"message"}}	Remove trailing comma.	JSON
if a = 94	if a == 94	Use ==.	MATLAB
<ul><li>hello<li>world</ul>	<ul><li>hello</li><li>world</li></ul>	Close li.	HTML
<user name='value'/>	<user name="value"/>	Double quotes.	XML
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(87);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(87, () => console.log('listening'));	Add callback.	Node.js
data[25]	if (data.indices.contains(25)) data[25]	Check index.	Kotlin

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

Correct.

Java

let index: i32 = "result";

let index: &str = "result";

Type mismatch.

Rust

let val: Int = 'data'

let val: String = 'data'

Fix type.

Swift

<entry><desc>data</desc><name>10</name></entry

Add closing >.

XML

INSERT INTO items VALUES ('output',12)

INSERT INTO items (name, status) VALUES ('output',12);

Specify columns.

SQL

data[20]

if (length(data) >= 20) data[20]

Check length.

R

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

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

Declare before use.

C++

System.out.println('message')

System.out.println('message');

Add semicolon.

Java

Add alt text.

HTML

def handle puts 'data' end

Correct.

Ruby

DELETE FROM users WHERE age=47

DELETE FROM users WHERE age=47;

Add semicolon.

SQL

my @arr = (48,60,21);

Correct.

Perl

'info' + 23

'info' + str(23)

Can't add int to string.

Python

21z = 10

z21 = 10

Variable cannot start with digit.

Python

disp('hello')

Correct.

MATLAB

h1 {{ font-size:45px color:red; }}

h1 {{ font-size:45px; color:red; }}

Add semicolon.

CSS

<br>

Self-closing.

HTML

var result int = 'info'

var result string = 'info'

Type mismatch.

Go

if (item = 36)

if (item == 36)

Use ==.

R

const result;

const result = 74;

Initialize const.

JavaScript

let x: i32 = "info";

let x: &str = "info";

Type mismatch.

Rust

SELECT age role FROM items;

SELECT age, role FROM items;

Add comma.

SQL

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

Correct.

PHP

Add comma.

JSON

$data[63] = 5;

if (isset($data[63])) $data[63] = 5;

Check existence.

PHP

console.log('value'

console.log('value')

Close parenthesis.

JavaScript

os.sqrt(75)

import os os.sqrt(75)

Import module first.

Python

bar

bar()

Add parentheses.

Kotlin

if z = 24

if z == 24

Use ==.

Ruby

$a = 78; if ($a = 78) {{}}

$a = 78; if ($a == 78) {{}}

Use ==.

PHP

let count = 10;

Correct.

JavaScript

function process(): void {{ return 19; }}

function process(): number {{ return 19; }}

Return type mismatch.

TypeScript

y == '96'

y === 96

Use strict equality.

JavaScript

data = test

data = 'test'

Quote strings.

Python

class = 'output'

class_name = 'output'

'class' is a keyword.

Python

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

Correct.

Java

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

Correct.

Shell

Write-Host 'data'

Correct.

PowerShell

let mut x=84; let r1=&mut x; let ref2=&mut x;

let mut x=84; {{ let r1=&mut x; }} let ref2=&mut x;

Only one mutable borrow.

Rust

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

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

cin >> temp cout << temp;

cin >> temp; cout << temp;

Add semicolon.

C++

if b = 94 {{}}

if b == 94 {{}}

Use ==.

Swift

x := 45

Correct.

Go

int[] data = new int[6]; data[6] = 5;

int[] data = new int[6]; if (6 < data.length) data[6] = 5;

Check bounds.

Java

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

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

Arrow functions are cleaner.

JavaScript

["result", 4]

Correct.

JSON

b > 77 & b < 53

b > 77 and b < 53

Use 'and' not '&'.

Python

if (data = 98)

if (data == 98)

Use ==.

C++

SELECT * FROM orders WHRE status=61;

SELECT * FROM orders WHERE status=61;

Fix WHERE.

SQL

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

const obj:Person = {{name:'output', age:61}};

Add missing property.

TypeScript

<?php // code ?>

Correct.

PHP

if ($count = 76)

if ($count == 76)

Use ==.

Perl

let bar: number | null = null; bar.toFixed(3);

let bar: number | null = null; if(bar!==null) bar.toFixed(3);

Null check.

TypeScript

fmt.Println 'output'

fmt.Println('output')

Missing parentheses.

Go

// comment

/* comment */

Use /* */.

CSS

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

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

Nest properly.

HTML

values(34)

if length(values) >= 34, values(34), end

Check length.

MATLAB

if num > 90 print('data')

if num > 90: print('data')

Colon missing after if.

Python

Use style attribute.

CSS

cin >> b;

int b; cin >> b;

Declare variable.

C++

val foo = 'hello'

val foo = "hello"

Double quotes.

Kotlin

String result = 'info';

String result = "info";

Double quotes.

Java

function bar() {{ return {{key:'result'}} }}

function bar() {{ return {{key:'result'}}; }}

Return object on same line.

JavaScript

UPDATE orders SET name='test' WHERE status=75

UPDATE orders SET name='test' WHERE status=75;

Add semicolon.

SQL

'49' + 48

49 + 48

Avoid string coercion.

JavaScript

fn compute() -> i32 {{ 95 }}

Correct.

Rust

print('data')

Correct.

R

.User {{ color: red; }}

Correct.

CSS

int arr[85]; arr[85]=5;

int arr[85]; if(85<85){{}} else arr[85]=5;

Bounds check.

C++

<p>output <b>data</p></b>

<p>output <b>data</b></p>

Nest properly.

HTML

Correct.

XML

class Order {{ int count; }} obj.count=5;

class Order {{ public int count; }} obj.count=5;

Make field public.

Java

val bar: Int = 'data'

val bar: String = 'data'

Fix type.

Kotlin

[87, 3, 27

[87, 3, 27]

Close bracket.

Python

render

render()

Add parentheses.

Swift

class Product {{ int val; }};

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

Make public.

C++

jwt.sign({{id:78}}, 'secret');

jwt.sign({{id:78}}, 'secret', {{expiresIn:'15m'}});

Add expiration.

Node.js

list: - item1 - item2

Correct.

YAML

<center>message</center>

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

Use CSS.

HTML

print 'info'

print 'info';

Add semicolon.

Perl

if x = 62

if x == 62

Use ==.

Go

Order.save();

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

Handle promise.

Node.js

div {{ color=#fff; }}

div {{ color: #fff; }}

Use colon.

CSS

print 'value'

print('value')

print needs parentheses.

Python

if a > 31 puts 'result'

if a > 31 puts 'result' end

Add 'end'.

Ruby

<hr>

Self-closing.

HTML

if (a = 93) {{}}

if (a == 93) {{}}

Use ==.

Java

p {{ color: blue }}

p {{ color: blue; }}

Add semicolon.

CSS

def process(temp): return temp + 1

Correct.

Python

if [ $z = 62 ]; then

if [ "$z" = 62 ]; then

Quote variable.

Shell

let c = 'value'

let c = "value"

Double quotes.

Swift

WHERE name = '11'

WHERE name = 11

Don't quote integer.

SQL

for (int i=0; i<4; i++) {{}}

Correct.

Java

Remove trailing comma.

JSON

if a = 94

if a == 94

Use ==.

MATLAB

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

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

Close li.

HTML

Double quotes.

XML

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(87);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(87, () => console.log('listening'));

Add callback.

Node.js

data[25]

if (data.indices.contains(25)) data[25]

Check index.

Kotlin