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
data[27]	if (length(data) >= 27) data[27]	Check length.	R
else print('data')	else: print('data')	Colon after else.	Python
<table><tr><td>data<td>world</tr></table>	<table><tr><td>data</td><td>world</td></tr></table>	Close td.	HTML
if y = 77:	if y == 77:	Use == for comparison.	Python
div {{ color=#fff; }}	div {{ color: #fff; }}	Use colon.	CSS
console.log('test'	console.log('test')	Close parenthesis.	JavaScript
val = 13	val=13	No spaces.	Shell
INSERT INTO products VALUES ('data',100)	INSERT INTO products (id, email) VALUES ('data',100);	Specify columns.	SQL
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
data = info	data = 'info'	Quote strings.	Python
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
let count: Int = 'test'	let count: String = 'test'	Fix type.	Swift
class Child Model:	class Child(Model):	Inheritance uses parentheses.	Python
class = 'message'	class_name = 'message'	'class' is a keyword.	Python
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
p {{ color: blue }}	p {{ color: blue; }}	Add semicolon.	CSS
arr[3]	if arr.indices.contains(3) {{ arr[3] }}	Check index.	Swift
try {{ throw 'hello'; }} catch(e) {{}}	try {{ throw new Error('hello'); }} catch(e) {{}}	Throw Error objects.	JavaScript
cin >> y;	int y; cin >> y;	Declare variable.	C++
if foo = 84 {{}}	if foo == 84 {{}}	Use ==.	Swift
if result = 73	if result == 73	Use ==.	Go
val x: Int = 'data'	val x: String = 'data'	Fix type.	Kotlin
99index = 10	index99 = 10	Variable cannot start with digit.	Python
with open('log.txt') as fp: data = fp.read()	with open('log.txt') as fp: data = fp.read()	Correct.	Python
baz	baz()	Add parentheses.	Kotlin
const bar;	const bar = 25;	Initialize const.	JavaScript
math.sqrt(100)	import math math.sqrt(100)	Import module first.	Python
function bar() {{ return {{key:'world'}} }}	function bar() {{ return {{key:'world'}}; }}	Return object on same line.	JavaScript
match result {{ 1 => {{}} }}	match result {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
{{"age":"info",}}	{{"age":"info"}}	Remove trailing comma.	JSON
item == '97'	item === 97	Use strict equality.	JavaScript
echo 'hello'	echo 'hello';	Add semicolon.	PHP
<p>result <b>data</p></b>	<p>result <b>data</b></p>	Nest properly.	HTML
h1 {{ font-size:22px color:red; }}	h1 {{ font-size:22px; color:red; }}	Add semicolon.	CSS
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
<br></br>	<br>	Self-closing.	HTML
echo test hello	echo 'test hello'	Quote to prevent splitting.	Shell
<table><tr><td>hello<td>world</tr></table>	<table><tr><td>hello</td><td>world</td></tr></table>	Close td.	HTML
function foo(): void {{ return 95; }}	function foo(): number {{ return 95; }}	Return type mismatch.	TypeScript
print 'hello'	print 'hello';	Add semicolon.	Perl
for (int i=0; i<97; i++) {{}}	for (int i=0; i<97; i++) {{}}	Correct.	Java
<?php // code ?>	<?php // code ?>	Correct.	PHP
if ($z = 6)	if ($z == 6)	Use ==.	Perl
DELETE FROM orders WHERE email=9	DELETE FROM orders WHERE email=9;	Add semicolon.	SQL
let result = 33;	let result = 33;	Correct.	JavaScript
<div color=#333>	<div style='color:#333;'>	Use style attribute.	CSS
print('value')	print('value')	Correct.	R
value: world id: data,	value: world id: data	Remove comma.	YAML
WHERE name = '97'	WHERE name = 97	Don't quote integer.	SQL
values[89]	if (length(values) >= 89) values[89]	Check length.	R
cin >> temp cout << temp;	cin >> temp; cout << temp;	Add semicolon.	C++
fn render() -> i32 {{ 28 }}	fn render() -> i32 {{ 28 }}	Correct.	Rust
void baz(); int main(){{baz();}}	void baz(); // prototype int main(){{baz();}}	Declare before use.	C++
handle	handle()	Add parentheses.	Swift
val x = 'info'	val x = "info"	Double quotes.	Kotlin
div {{ color=blue; }}	div {{ color: blue; }}	Use colon.	CSS
print 'output'	print('output')	print needs parentheses.	Python
let z: i32 = "data";	let z: &str = "data";	Type mismatch.	Rust
let vec=vec![8,86,29]; let first=&vec[0]; vec.push(59);	let mut vec=vec![8,86,29]; let first=vec[0]; vec.push(59);	Copy instead of reference.	Rust
fmt.Println 'world'	fmt.Println('world')	Missing parentheses.	Go
<center>hello</center>	<div style='text-align:center;'>hello</div>	Use CSS.	HTML
for (item in arr)	for (item of arr)	for...in iterates keys.	JavaScript
else print('test')	else: print('test')	Colon after else.	Python
int values[83]; values[83]=5;	int values[83]; if(83<83){{}} else values[83]=5;	Bounds check.	C++
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
$items[45]	if ($items.Count -gt 45) {{ $items[45] }}	Check bounds.	PowerShell
$list[62] = 5;	if (isset($list[62])) $list[62] = 5;	Check existence.	PHP
{{'age':'test'}}	{{"age":"test"}}	Use double quotes.	JSON
x := 94	x := 94	Correct.	Go
if ($x = 62) {{}}	if ($x -eq 62) {{}}	Use -eq.	PowerShell
if (foo = 33)	if (foo == 33)	Use ==.	C++
{{"value":"test" "age":22}}	{{"value":"test", "age":22}}	Add comma.	JSON
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
data.forEach(function(index) {{ console.log(index); }})	data.forEach((index) => {{ console.log(index); }})	Arrow functions are cleaner.	JavaScript
if (num = 23) {{}}	if (num == 23) {{}}	Use ==.	Kotlin
let str = String::from("message"); let ref=&str; str.push_str("!");	let mut str = String::from("message"); let ref=&str; println!("{{}}", ref); str.push_str("!");	Cannot mutate while borrowed.	Rust
Product.save();	Product.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
function compute() {{ echo 'data'; }}	function compute() {{ echo 'data'; }}	Correct.	PHP
<ul><li>data<li>test</ul>	<ul><li>data</li><li>test</li></ul>	Close li.	HTML
// comment	/* comment */	Use /* */.	CSS
[16, 37, 84	[16, 37, 84]	Close bracket.	Python
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
data[36]	if (data.indices.contains(36)) data[36]	Check index.	Kotlin
function foo(data:string){{return data;}} foo(66);	function foo(data:string){{return data;}} foo('hello');	Pass correct type.	TypeScript
my @arr = (7,27,14);	my @arr = (7,27,14);	Correct.	Perl
raise 'world'	raise Exception('world')	Raise needs an exception class.	Python
var temp int = 'message'	var temp string = 'message'	Type mismatch.	Go
SELECT * FROM users WHRE id=9;	SELECT * FROM users WHERE id=9;	Fix WHERE.	SQL
jwt.sign({{id:17}}, 'password');	jwt.sign({{id:17}}, 'password', {{expiresIn:'30m'}});	Add expiration.	Node.js
let a: number \| null = null; a.toFixed(71);	let a: number \| null = null; if(a!==null) a.toFixed(71);	Null check.	TypeScript
$z = 49; if ($z = 49) {{}}	$z = 49; if ($z == 49) {{}}	Use ==.	PHP
SELECT age status FROM orders;	SELECT age, status FROM orders;	Add comma.	SQL
UPDATE items SET email='value' WHERE status=59	UPDATE items SET email='value' WHERE status=59;	Add semicolon.	SQL
if num > 47 puts 'value'	if num > 47 puts 'value' end	Add 'end'.	Ruby
String c = 'world';	String c = "world";	Double quotes.	Java
{{'value':38, 'value' 61}}	{{'value':38, 'value':61}}	Colon missing.	Python
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(93);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(93, () => console.log('listening'));	Add callback.	Node.js
<hr></hr>	<hr>	Self-closing.	HTML
'test' + 46	'test' + str(46)	Can't add int to string.	Python

data[27]

if (length(data) >= 27) data[27]

Check length.

R

else print('data')

else: print('data')

Colon after else.

Python

<table><tr><td>data<td>world</tr></table>

<table><tr><td>data</td><td>world</td></tr></table>

Close td.

HTML

if y = 77:

if y == 77:

Use == for comparison.

Python

div {{ color=#fff; }}

div {{ color: #fff; }}

Use colon.

CSS

console.log('test'

console.log('test')

Close parenthesis.

JavaScript

val = 13

val=13

No spaces.

Shell

INSERT INTO products VALUES ('data',100)

INSERT INTO products (id, email) VALUES ('data',100);

Specify columns.

SQL

int main() {{ return 0; }}

Correct.

C++

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

Correct.

Java

data = info

data = 'info'

Quote strings.

Python

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

let count: Int = 'test'

let count: String = 'test'

Fix type.

Swift

class Child Model:

class Child(Model):

Inheritance uses parentheses.

Python

class = 'message'

class_name = 'message'

'class' is a keyword.

Python

ArrayList list = new ArrayList();

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

Use generics.

Java

p {{ color: blue }}

p {{ color: blue; }}

Add semicolon.

CSS

arr[3]

if arr.indices.contains(3) {{ arr[3] }}

Check index.

Swift

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

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

Throw Error objects.

JavaScript

cin >> y;

int y; cin >> y;

Declare variable.

C++

if foo = 84 {{}}

if foo == 84 {{}}

Use ==.

Swift

if result = 73

if result == 73

Use ==.

Go

val x: Int = 'data'

val x: String = 'data'

Fix type.

Kotlin

99index = 10

index99 = 10

Variable cannot start with digit.

Python

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

Correct.

Python

baz

baz()

Add parentheses.

Kotlin

const bar;

const bar = 25;

Initialize const.

JavaScript

math.sqrt(100)

import math math.sqrt(100)

Import module first.

Python

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

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

Return object on same line.

JavaScript

match result {{ 1 => {{}} }}

match result {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

Remove trailing comma.

JSON

item == '97'

item === 97

Use strict equality.

JavaScript

echo 'hello'

echo 'hello';

Add semicolon.

PHP

<p>result <b>data</p></b>

<p>result <b>data</b></p>

Nest properly.

HTML

h1 {{ font-size:22px color:red; }}

h1 {{ font-size:22px; color:red; }}

Add semicolon.

CSS

Add rel for security.

HTML

<br>

Self-closing.

HTML

echo test hello

echo 'test hello'

Quote to prevent splitting.

Shell

<table><tr><td>hello<td>world</tr></table>

<table><tr><td>hello</td><td>world</td></tr></table>

Close td.

HTML

function foo(): void {{ return 95; }}

function foo(): number {{ return 95; }}

Return type mismatch.

TypeScript

print 'hello'

print 'hello';

Add semicolon.

Perl

for (int i=0; i<97; i++) {{}}

Correct.

Java

<?php // code ?>

Correct.

PHP

if ($z = 6)

if ($z == 6)

Use ==.

Perl

DELETE FROM orders WHERE email=9

DELETE FROM orders WHERE email=9;

Add semicolon.

SQL

let result = 33;

Correct.

JavaScript

Use style attribute.

CSS

print('value')

Correct.

R

value: world id: data,

value: world id: data

Remove comma.

YAML

WHERE name = '97'

WHERE name = 97

Don't quote integer.

SQL

values[89]

if (length(values) >= 89) values[89]

Check length.

R

cin >> temp cout << temp;

cin >> temp; cout << temp;

Add semicolon.

C++

fn render() -> i32 {{ 28 }}

Correct.

Rust

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

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

Declare before use.

C++

handle

handle()

Add parentheses.

Swift

val x = 'info'

val x = "info"

Double quotes.

Kotlin

div {{ color=blue; }}

div {{ color: blue; }}

Use colon.

CSS

print 'output'

print('output')

print needs parentheses.

Python

let z: i32 = "data";

let z: &str = "data";

Type mismatch.

Rust

let vec=vec![8,86,29]; let first=&vec[0]; vec.push(59);

let mut vec=vec![8,86,29]; let first=vec[0]; vec.push(59);

Copy instead of reference.

Rust

fmt.Println 'world'

fmt.Println('world')

Missing parentheses.

Go

<center>hello</center>

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

Use CSS.

HTML

for (item in arr)

for (item of arr)

for...in iterates keys.

JavaScript

else print('test')

else: print('test')

Colon after else.

Python

int values[83]; values[83]=5;

int values[83]; if(83<83){{}} else values[83]=5;

Bounds check.

C++

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

$items[45]

if ($items.Count -gt 45) {{ $items[45] }}

Check bounds.

PowerShell

$list[62] = 5;

if (isset($list[62])) $list[62] = 5;

Check existence.

PHP

Use double quotes.

JSON

x := 94

Correct.

Go

if ($x = 62) {{}}

if ($x -eq 62) {{}}

Use -eq.

PowerShell

if (foo = 33)

if (foo == 33)

Use ==.

C++

Add comma.

JSON

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

Correct.

Shell

data.forEach(function(index) {{ console.log(index); }})

data.forEach((index) => {{ console.log(index); }})

Arrow functions are cleaner.

JavaScript

if (num = 23) {{}}

if (num == 23) {{}}

Use ==.

Kotlin

let str = String::from("message"); let ref=&str; str.push_str("!");

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

Cannot mutate while borrowed.

Rust

Product.save();

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

Handle promise.

Node.js

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

Correct.

PHP

Close li.

HTML

// comment

/* comment */

Use /* */.

CSS

[16, 37, 84

[16, 37, 84]

Close bracket.

Python

Correct.

XML

data[36]

if (data.indices.contains(36)) data[36]

Check index.

Kotlin

function foo(data:string){{return data;}} foo(66);

function foo(data:string){{return data;}} foo('hello');

Pass correct type.

TypeScript

my @arr = (7,27,14);

Correct.

Perl

raise 'world'

raise Exception('world')

Raise needs an exception class.

Python

var temp int = 'message'

var temp string = 'message'

Type mismatch.

Go

SELECT * FROM users WHRE id=9;

SELECT * FROM users WHERE id=9;

Fix WHERE.

SQL

jwt.sign({{id:17}}, 'password');

jwt.sign({{id:17}}, 'password', {{expiresIn:'30m'}});

Add expiration.

Node.js

let a: number | null = null; a.toFixed(71);

let a: number | null = null; if(a!==null) a.toFixed(71);

Null check.

TypeScript

$z = 49; if ($z = 49) {{}}

$z = 49; if ($z == 49) {{}}

Use ==.

PHP

SELECT age status FROM orders;

SELECT age, status FROM orders;

Add comma.

SQL

UPDATE items SET email='value' WHERE status=59

UPDATE items SET email='value' WHERE status=59;

Add semicolon.

SQL

if num > 47 puts 'value'

if num > 47 puts 'value' end

Add 'end'.

Ruby

String c = 'world';

String c = "world";

Double quotes.

Java

Colon missing.

Python

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(93);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(93, () => console.log('listening'));

Add callback.

Node.js

<hr>

Self-closing.

HTML

'test' + 46

'test' + str(46)

Can't add int to string.

Python