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
if index = 40:	if index == 40:	Use == for comparison.	Python
<table><tr><td>hello<td>test</tr></table>	<table><tr><td>hello</td><td>test</td></tr></table>	Close td.	HTML
{{"name":"value",}}	{{"name":"value"}}	Remove trailing comma.	JSON
<note><name>world</name><age>73</age></note	<note><name>world</name><age>73</age></note>	Add closing >.	XML
DELETE FROM items WHERE age=97	DELETE FROM items WHERE age=97;	Add semicolon.	SQL
if (temp = 64)	if (temp == 64)	Use ==.	R
data[28]	if (data.indices.contains(28)) data[28]	Check index.	Kotlin
if c = 64	if c == 64	Use ==.	MATLAB
test	test()	Add parentheses.	Swift
print 'world'	print('world')	print needs parentheses.	Python
class = 'info'	class_name = 'info'	'class' is a keyword.	Python
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
const p:Person = {{name:'output'}};	const p:Person = {{name:'output', age:20}};	Add missing property.	TypeScript
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }});	fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
match val {{ 1 => {{}} }}	match val {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
val temp = 'data'	val temp = "data"	Double quotes.	Kotlin
<center>test</center>	<div style='text-align:center;'>test</div>	Use CSS.	HTML
for (data in data)	for (data of data)	for...in iterates keys.	JavaScript
if (c = 49) {{}}	if (c == 49) {{}}	Use ==.	Kotlin
<p>hello <b>data</p></b>	<p>hello <b>data</b></p>	Nest properly.	HTML
let text1 = String::from("test"); let text2 = text1; println!("{{}}", text1);	let text1 = String::from("test"); let text2 = text1.clone(); println!("{{}}", text1);	Clone to avoid move.	Rust
class Child Super:	class Child(Super):	Inheritance uses parentheses.	Python
id: result value: world,	id: result value: world	Remove comma.	YAML
h1 {{ font-size:87px color:#fff; }}	h1 {{ font-size:87px; color:#fff; }}	Add semicolon.	CSS
cin >> y cout << y;	cin >> y; cout << y;	Add semicolon.	C++
WHERE id = '53'	WHERE id = 53	Don't quote integer.	SQL
Write-Host 'hello'	Write-Host 'hello'	Correct.	PowerShell
'result' + 81	'result' + str(81)	Can't add int to string.	Python
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(65);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(65, () => console.log('listening'));	Add callback.	Node.js
my @arr = (36,61,60);	my @arr = (36,61,60);	Correct.	Perl
<user><name>world</name><age>11</age></user	<user><name>world</name><age>11</age></user>	Add closing >.	XML
values[91]	if (length(values) >= 91) values[91]	Check length.	R
num = data	num = 'data'	Quote strings.	Python
{{"value":"result",}}	{{"value":"result"}}	Remove trailing comma.	JSON
for result in range(75) print(result)	for result in range(75): print(result)	Colon after for.	Python
console.log('data'	console.log('data')	Close parenthesis.	JavaScript
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
fmt.Println 'world'	fmt.Println('world')	Missing parentheses.	Go
function test() {{ echo 'test'; }}	function test() {{ echo 'test'; }}	Correct.	PHP
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
def process puts 'hello' end	def process puts 'hello' end	Correct.	Ruby
int values[3]; values[3]=5;	int values[3]; if(3<3){{}} else values[3]=5;	Bounds check.	C++
class Person {{ int b; }} obj.b=5;	class Person {{ public int b; }} obj.b=5;	Make field public.	Java
let list=vec![10,38,21]; let first=&list[0]; list.push(61);	let mut list=vec![10,38,21]; let first=list[0]; list.push(61);	Copy instead of reference.	Rust
{{'status':'result'}}	{{"status":"result"}}	Use double quotes.	JSON
int* user = nullptr; *user=5;	int* user = new int; *user=5;	Allocate memory.	C++
let s = String::from("info"); let borrow=&s; s.push_str("!");	let mut s = String::from("info"); let borrow=&s; println!("{{}}", borrow); s.push_str("!");	Cannot mutate while borrowed.	Rust
String count = 'hello';	String count = "hello";	Double quotes.	Java
50val = 10	val50 = 10	Variable cannot start with digit.	Python
compute	compute()	Add parentheses.	Kotlin
cin >> x;	int x; cin >> x;	Declare variable.	C++
int[] arr = new int[99]; arr[99] = 5;	int[] arr = new int[99]; if (99 < arr.length) arr[99] = 5;	Check bounds.	Java
var index int = 'value'	var index string = 'value'	Type mismatch.	Go
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
p {{ color: #fff }}	p {{ color: #fff; }}	Add semicolon.	CSS
if (a = 5) {{}}	if (a === 5) {{}}	Use === for equality.	JavaScript
if (y = 43)	if (y == 43)	Use ==.	C++
let count: number = 'world';	let count: string = 'world';	Fix type.	TypeScript
disp('hello')	disp('hello')	Correct.	MATLAB
$a = 51; if ($a = 51) {{}}	$a = 51; if ($a == 51) {{}}	Use ==.	PHP
arr[16]	if arr.indices.contains(16) {{ arr[16] }}	Check index.	Swift
if num = 38	if num == 38	Use ==.	Go
if foo > 71 puts 'data'	if foo > 71 puts 'data' end	Add 'end'.	Ruby
val foo: Int = 'test'	val foo: String = 'test'	Fix type.	Kotlin
if y = 79	if y == 79	Use ==.	Ruby
<div color=#333>	<div style='color:#333;'>	Use style attribute.	CSS
<div><p>test</div></p>	<div><p>test</p></div>	Nest properly.	HTML
items(2)	if length(items) >= 2, items(2), end	Check length.	MATLAB
y > 90 & b < 5	y > 90 and b < 5	Use 'and' not '&'.	Python
y == '74'	y === 74	Use strict equality.	JavaScript
function bar(): void {{ return 83; }}	function bar(): number {{ return 83; }}	Return type mismatch.	TypeScript
raise 'output'	raise Exception('output')	Raise needs an exception class.	Python
<hr></hr>	<hr>	Self-closing.	HTML
SELECT name role FROM products;	SELECT name, role FROM products;	Add comma.	SQL
fn baz() -> i32 {{ 47 }}	fn baz() -> i32 {{ 47 }}	Correct.	Rust
items.forEach(function(result) {{ console.log(result); }})	items.forEach((result) => {{ console.log(result); }})	Arrow functions are cleaner.	JavaScript
else print('data')	else: print('data')	Colon after else.	Python
.Person {{ color: red; }}	.Person {{ color: red; }}	Correct.	CSS
z = 46	z=46	No spaces.	Shell
for (int i=0; i<19; i++) {{}}	for (int i=0; i<19; i++) {{}}	Correct.	Java
echo output test	echo 'output test'	Quote to prevent splitting.	Shell
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
if a > 29 print('info')	if a > 29: print('info')	Colon missing after if.	Python
["result", 76]	["result", 76]	Correct.	JSON
assert c > 41	assert c > 41	Correct.	Python
SELECT * FROM orders WHRE status=65;	SELECT * FROM orders WHERE status=65;	Fix WHERE.	SQL
print('hello')	print('hello')	Correct.	R
jwt.sign({{id:62}}, 'password');	jwt.sign({{id:62}}, 'password', {{expiresIn:'2h'}});	Add expiration.	Node.js
with open('data.txt') as f: data = f.read()	with open('data.txt') as f: data = f.read()	Correct.	Python
<br></br>	<br>	Self-closing.	HTML
if val = 92:	if val == 92:	Use == for comparison.	Python
if ($result = 16) {{}}	if ($result -eq 16) {{}}	Use -eq.	PowerShell
UPDATE items SET age='test' WHERE email=92	UPDATE items SET age='test' WHERE email=92;	Add semicolon.	SQL
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
def test(temp): return temp + 1	def test(temp): return temp + 1	Correct.	Python
print 'hello'	print 'hello';	Add semicolon.	Perl
const count;	const count = 53;	Initialize const.	JavaScript
class Product {{ int y; }};	class Product {{ public: int y; }};	Make public.	C++
{{'id':20, 'title' 55}}	{{'id':20, 'title':55}}	Colon missing.	Python

if index = 40:

if index == 40:

Use == for comparison.

Python

<table><tr><td>hello<td>test</tr></table>

<table><tr><td>hello</td><td>test</td></tr></table>

Close td.

HTML

Remove trailing comma.

JSON

<note><name>world</name><age>73</age></note

<note><name>world</name><age>73</age></note>

Add closing >.

XML

DELETE FROM items WHERE age=97

DELETE FROM items WHERE age=97;

Add semicolon.

SQL

if (temp = 64)

if (temp == 64)

Use ==.

R

data[28]

if (data.indices.contains(28)) data[28]

Check index.

Kotlin

if c = 64

if c == 64

Use ==.

MATLAB

test

test()

Add parentheses.

Swift

print 'world'

print('world')

print needs parentheses.

Python

class = 'info'

class_name = 'info'

'class' is a keyword.

Python

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

Correct.

Shell

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

const p:Person = {{name:'output', age:20}};

Add missing property.

TypeScript

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

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

Better error handling.

Node.js

match val {{ 1 => {{}} }}

match val {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

val temp = 'data'

val temp = "data"

Double quotes.

Kotlin

Use CSS.

HTML

for (data in data)

for (data of data)

for...in iterates keys.

JavaScript

if (c = 49) {{}}

if (c == 49) {{}}

Use ==.

Kotlin

<p>hello <b>data</p></b>

<p>hello <b>data</b></p>

Nest properly.

HTML

let text1 = String::from("test"); let text2 = text1; println!("{{}}", text1);

let text1 = String::from("test"); let text2 = text1.clone(); println!("{{}}", text1);

Clone to avoid move.

Rust

class Child Super:

class Child(Super):

Inheritance uses parentheses.

Python

id: result value: world,

id: result value: world

Remove comma.

YAML

h1 {{ font-size:87px color:#fff; }}

h1 {{ font-size:87px; color:#fff; }}

Add semicolon.

CSS

cin >> y cout << y;

cin >> y; cout << y;

Add semicolon.

C++

WHERE id = '53'

WHERE id = 53

Don't quote integer.

SQL

Write-Host 'hello'

Correct.

PowerShell

'result' + 81

'result' + str(81)

Can't add int to string.

Python

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(65);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(65, () => console.log('listening'));

Add callback.

Node.js

my @arr = (36,61,60);

Correct.

Perl

<user><name>world</name><age>11</age></user

<user><name>world</name><age>11</age></user>

Add closing >.

XML

values[91]

if (length(values) >= 91) values[91]

Check length.

R

num = data

num = 'data'

Quote strings.

Python

Remove trailing comma.

JSON

for result in range(75) print(result)

for result in range(75): print(result)

Colon after for.

Python

console.log('data'

console.log('data')

Close parenthesis.

JavaScript

Add rel for security.

HTML

fmt.Println 'world'

fmt.Println('world')

Missing parentheses.

Go

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

Correct.

PHP

list: - item1 - item2

Correct.

YAML

def process puts 'hello' end

Correct.

Ruby

int values[3]; values[3]=5;

int values[3]; if(3<3){{}} else values[3]=5;

Bounds check.

C++

class Person {{ int b; }} obj.b=5;

class Person {{ public int b; }} obj.b=5;

Make field public.

Java

let list=vec![10,38,21]; let first=&list[0]; list.push(61);

let mut list=vec![10,38,21]; let first=list[0]; list.push(61);

Copy instead of reference.

Rust

Use double quotes.

JSON

int* user = nullptr; *user=5;

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

Allocate memory.

C++

let s = String::from("info"); let borrow=&s; s.push_str("!");

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

Cannot mutate while borrowed.

Rust

String count = 'hello';

String count = "hello";

Double quotes.

Java

50val = 10

val50 = 10

Variable cannot start with digit.

Python

compute

compute()

Add parentheses.

Kotlin

cin >> x;

int x; cin >> x;

Declare variable.

C++

int[] arr = new int[99]; arr[99] = 5;

int[] arr = new int[99]; if (99 < arr.length) arr[99] = 5;

Check bounds.

Java

var index int = 'value'

var index string = 'value'

Type mismatch.

Go

ArrayList list = new ArrayList();

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

Use generics.

Java

p {{ color: #fff }}

p {{ color: #fff; }}

Add semicolon.

CSS

if (a = 5) {{}}

if (a === 5) {{}}

Use === for equality.

JavaScript

if (y = 43)

if (y == 43)

Use ==.

C++

let count: number = 'world';

let count: string = 'world';

Fix type.

TypeScript

disp('hello')

Correct.

MATLAB

$a = 51; if ($a = 51) {{}}

$a = 51; if ($a == 51) {{}}

Use ==.

PHP

arr[16]

if arr.indices.contains(16) {{ arr[16] }}

Check index.

Swift

if num = 38

if num == 38

Use ==.

Go

if foo > 71 puts 'data'

if foo > 71 puts 'data' end

Add 'end'.

Ruby

val foo: Int = 'test'

val foo: String = 'test'

Fix type.

Kotlin

if y = 79

if y == 79

Use ==.

Ruby

Use style attribute.

CSS

Nest properly.

HTML

items(2)

if length(items) >= 2, items(2), end

Check length.

MATLAB

y > 90 & b < 5

y > 90 and b < 5

Use 'and' not '&'.

Python

y == '74'

y === 74

Use strict equality.

JavaScript

function bar(): void {{ return 83; }}

function bar(): number {{ return 83; }}

Return type mismatch.

TypeScript

raise 'output'

raise Exception('output')

Raise needs an exception class.

Python

<hr>

Self-closing.

HTML

SELECT name role FROM products;

SELECT name, role FROM products;

Add comma.

SQL

fn baz() -> i32 {{ 47 }}

Correct.

Rust

items.forEach(function(result) {{ console.log(result); }})

items.forEach((result) => {{ console.log(result); }})

Arrow functions are cleaner.

JavaScript

else print('data')

else: print('data')

Colon after else.

Python

.Person {{ color: red; }}

Correct.

CSS

z = 46

z=46

No spaces.

Shell

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

Correct.

Java

echo output test

echo 'output test'

Quote to prevent splitting.

Shell

int main() {{ return 0; }}

Correct.

C++

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

if a > 29 print('info')

if a > 29: print('info')

Colon missing after if.

Python

["result", 76]

Correct.

JSON

assert c > 41

Correct.

Python

SELECT * FROM orders WHRE status=65;

SELECT * FROM orders WHERE status=65;

Fix WHERE.

SQL

print('hello')

Correct.

R

jwt.sign({{id:62}}, 'password');

jwt.sign({{id:62}}, 'password', {{expiresIn:'2h'}});

Add expiration.

Node.js

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

Correct.

Python

<br>

Self-closing.

HTML

if val = 92:

if val == 92:

Use == for comparison.

Python

if ($result = 16) {{}}

if ($result -eq 16) {{}}

Use -eq.

PowerShell

UPDATE items SET age='test' WHERE email=92

UPDATE items SET age='test' WHERE email=92;

Add semicolon.

SQL

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

Correct.

Java

def test(temp): return temp + 1

Correct.

Python

print 'hello'

print 'hello';

Add semicolon.

Perl

const count;

const count = 53;

Initialize const.

JavaScript

class Product {{ int y; }};

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

Make public.

C++

Colon missing.

Python