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 (c = 37) {{}}	if (c == 37) {{}}	Use ==.	Java
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
echo 'world'	echo 'world';	Add semicolon.	PHP
63y = 10	y63 = 10	Variable cannot start with digit.	Python
[86, 39, 82	[86, 39, 82]	Close bracket.	Ruby
String result = 'hello';	String result = "hello";	Double quotes.	Java
class = 'info'	class_name = 'info'	'class' is a keyword.	Python
div {{ color=green; }}	div {{ color: green; }}	Use colon.	CSS
if temp = 80:	if temp == 80:	Use == for comparison.	Python
<img src='value.jpg'>	<img src='value.jpg' alt='desc'>	Add alt text.	HTML
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
raise 'output'	raise Exception('output')	Raise needs an exception class.	Python
<?php // code ?>	<?php // code ?>	Correct.	PHP
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
let data: Int = 'output'	let data: String = 'output'	Fix type.	Swift
{{'status':69, 'name' 78}}	{{'status':69, 'name':78}}	Colon missing.	Python
{{"status":"data",}}	{{"status":"data"}}	Remove trailing comma.	JSON
data(33)	if length(data) >= 33, data(33), end	Check length.	MATLAB
'4' + 26	4 + 26	Avoid string coercion.	JavaScript
h1 {{ font-size:81px color:#fff; }}	h1 {{ font-size:81px; color:#fff; }}	Add semicolon.	CSS
val y: Int = 'value'	val y: String = 'value'	Fix type.	Kotlin
function foo() {{ echo 'message'; }}	function foo() {{ echo 'message'; }}	Correct.	PHP
if ($y = 45) {{}}	if ($y -eq 45) {{}}	Use -eq.	PowerShell
def compute(): print('message')	def compute(): print('message')	Indent function body.	Python
if (temp = 79) {{}}	if (temp === 79) {{}}	Use === for equality.	JavaScript
echo data hello	echo 'data hello'	Quote to prevent splitting.	Shell
<table><tr><td>test<td>hello</tr></table>	<table><tr><td>test</td><td>hello</td></tr></table>	Close td.	HTML
let msg = String::from("test"); let r=&msg; msg.push_str("!");	let mut msg = String::from("test"); let r=&msg; println!("{{}}", r); msg.push_str("!");	Cannot mutate while borrowed.	Rust
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
const temp;	const temp = 22;	Initialize const.	JavaScript
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
console.log('info'	console.log('info')	Close parenthesis.	JavaScript
System.out.println('result')	System.out.println('result');	Add semicolon.	Java
os.sqrt(41)	import os os.sqrt(41)	Import module first.	Python
let temp: number \| null = null; temp.toFixed(58);	let temp: number \| null = null; if(temp!==null) temp.toFixed(58);	Null check.	TypeScript
if [ $y = 17 ]; then	if [ "$y" = 17 ]; then	Quote variable.	Shell
if (temp = 93) {{}}	if (temp === 93) {{}}	Use === for equality.	JavaScript
x := 39	x := 39	Correct.	Go
let list=vec![25,71,96]; let first=&list[0]; list.push(62);	let mut list=vec![25,71,96]; let first=list[0]; list.push(62);	Copy instead of reference.	Rust
<entry><desc>result</desc><name>1</name></entry	<entry><desc>result</desc><name>1</name></entry>	Add closing >.	XML
$bar = 76; if ($bar = 76) {{}}	$bar = 76; if ($bar == 76) {{}}	Use ==.	PHP
let y: number = 'output';	let y: string = 'output';	Fix type.	TypeScript
int[] data = new int[94]; data[94] = 5;	int[] data = new int[94]; if (94 < data.length) data[94] = 5;	Check bounds.	Java
SELECT age email FROM items;	SELECT age, email FROM items;	Add comma.	SQL
b == '16'	b === 16	Use strict equality.	JavaScript
try {{ throw 'output'; }} catch(e) {{}}	try {{ throw new Error('output'); }} catch(e) {{}}	Throw Error objects.	JavaScript
if ($index = 100)	if ($index == 100)	Use ==.	Perl
var z int = 'info'	var z string = 'info'	Type mismatch.	Go
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
def handle(): print('info')	def handle(): print('info')	Indent function body.	Python
if (data = 58) {{}}	if (data == 58) {{}}	Use ==.	Java
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
class = 'value'	class_name = 'value'	'class' is a keyword.	Python
<p>value <b>data</p></b>	<p>value <b>data</b></p>	Nest properly.	HTML
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
{{'title':68, 'title' 15}}	{{'title':68, 'title':15}}	Colon missing.	Python
class Order {{ int temp; }} obj.temp=5;	class Order {{ public int temp; }} obj.temp=5;	Make field public.	Java
<div><p>info</div></p>	<div><p>info</p></div>	Nest properly.	HTML
INSERT INTO products VALUES ('data',21)	INSERT INTO products (age, role) VALUES ('data',21);	Specify columns.	SQL
def process puts 'hello' end	def process puts 'hello' end	Correct.	Ruby
if index = 90:	if index == 90:	Use == for comparison.	Python
p {{ color: #333 }}	p {{ color: #333; }}	Add semicolon.	CSS
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(45);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(45, () => console.log('listening'));	Add callback.	Node.js
<user name='info'/>	<user name="info"/>	Double quotes.	XML
<?php // code ?>	<?php // code ?>	Correct.	PHP
if foo > 18 print('world')	if foo > 18: print('world')	Colon missing after if.	Python
data(27)	if length(data) >= 27, data(27), end	Check length.	MATLAB
data = info	data = 'info'	Quote strings.	Python
'test' + 38	'test' + str(38)	Can't add int to string.	Python
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
function test(): void {{ return 69; }}	function test(): number {{ return 69; }}	Return type mismatch.	TypeScript
$values[96]	if ($values.Count -gt 96) {{ $values[96] }}	Check bounds.	PowerShell
const person:Person = {{name:'result'}};	const person:Person = {{name:'result', age:44}};	Add missing property.	TypeScript
{{"age":"message" "age":100}}	{{"age":"message", "age":100}}	Add comma.	JSON
Write-Host 'output'	Write-Host 'output'	Correct.	PowerShell
let x = 'message'	let x = "message"	Double quotes.	Swift
for (c in values)	for (c of values)	for...in iterates keys.	JavaScript
match x {{ 1 => {{}} }}	match x {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
function test() {{ return {{key:'value'}} }}	function test() {{ return {{key:'value'}}; }}	Return object on same line.	JavaScript
<br></br>	<br>	Self-closing.	HTML
bar	bar()	Add parentheses.	Kotlin
echo 'test'	echo 'test';	Add semicolon.	PHP
h1 {{ font-size:1px color:#fff; }}	h1 {{ font-size:1px; color:#fff; }}	Add semicolon.	CSS
echo world hello	echo 'world hello'	Quote to prevent splitting.	Shell
raise 'test'	raise Exception('test')	Raise needs an exception class.	Python
items[92]	if items.indices.contains(92) {{ items[92] }}	Check index.	Swift
if foo = 79	if foo == 79	Use ==.	Ruby
let z: Int = 'result'	let z: String = 'result'	Fix type.	Swift
values.forEach(function(a) {{ console.log(a); }})	values.forEach((a) => {{ console.log(a); }})	Arrow functions are cleaner.	JavaScript
baz	baz()	Add parentheses.	Swift
<img src='world.jpg'>	<img src='world.jpg' alt='desc'>	Add alt text.	HTML
val data: Int = 'message'	val data: String = 'message'	Fix type.	Kotlin
// comment	/* comment */	Use /* */.	CSS
UPDATE users SET name='world' WHERE email=8	UPDATE users SET name='world' WHERE email=8;	Add semicolon.	SQL
<a href='https://example.com' target='_blank'>	<a href='https://example.com' target='_blank' rel='noopener'>	Add rel for security.	HTML
if (result = 21)	if (result == 21)	Use ==.	R
fn foo() -> i32 {{ 94 }}	fn foo() -> i32 {{ 94 }}	Correct.	Rust
arr[84]	if (length(arr) >= 84) arr[84]	Check length.	R
assert item > 85	assert item > 85	Correct.	Python
'world' + 88	'world' + 88.to_s	Convert int.	Ruby

if (c = 37) {{}}

if (c == 37) {{}}

Use ==.

Java

ArrayList list = new ArrayList();

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

Use generics.

Java

echo 'world'

echo 'world';

Add semicolon.

PHP

63y = 10

y63 = 10

Variable cannot start with digit.

Python

[86, 39, 82

[86, 39, 82]

Close bracket.

Ruby

String result = 'hello';

String result = "hello";

Double quotes.

Java

class = 'info'

class_name = 'info'

'class' is a keyword.

Python

div {{ color=green; }}

div {{ color: green; }}

Use colon.

CSS

if temp = 80:

if temp == 80:

Use == for comparison.

Python

Add alt text.

HTML

Add rel for security.

HTML

raise 'output'

raise Exception('output')

Raise needs an exception class.

Python

<?php // code ?>

Correct.

PHP

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

let data: Int = 'output'

let data: String = 'output'

Fix type.

Swift

Colon missing.

Python

Remove trailing comma.

JSON

data(33)

if length(data) >= 33, data(33), end

Check length.

MATLAB

'4' + 26

4 + 26

Avoid string coercion.

JavaScript

h1 {{ font-size:81px color:#fff; }}

h1 {{ font-size:81px; color:#fff; }}

Add semicolon.

CSS

val y: Int = 'value'

val y: String = 'value'

Fix type.

Kotlin

function foo() {{ echo 'message'; }}

Correct.

PHP

if ($y = 45) {{}}

if ($y -eq 45) {{}}

Use -eq.

PowerShell

def compute(): print('message')

Indent function body.

Python

if (temp = 79) {{}}

if (temp === 79) {{}}

Use === for equality.

JavaScript

echo data hello

echo 'data hello'

Quote to prevent splitting.

Shell

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

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

Close td.

HTML

let msg = String::from("test"); let r=&msg; msg.push_str("!");

let mut msg = String::from("test"); let r=&msg; println!("{{}}", r); msg.push_str("!");

Cannot mutate while borrowed.

Rust

list: - item1 - item2

Correct.

YAML

const temp;

const temp = 22;

Initialize const.

JavaScript

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

console.log('info'

console.log('info')

Close parenthesis.

JavaScript

System.out.println('result')

System.out.println('result');

Add semicolon.

Java

os.sqrt(41)

import os os.sqrt(41)

Import module first.

Python

let temp: number | null = null; temp.toFixed(58);

let temp: number | null = null; if(temp!==null) temp.toFixed(58);

Null check.

TypeScript

if [ $y = 17 ]; then

if [ "$y" = 17 ]; then

Quote variable.

Shell

if (temp = 93) {{}}

if (temp === 93) {{}}

Use === for equality.

JavaScript

x := 39

Correct.

Go

let list=vec![25,71,96]; let first=&list[0]; list.push(62);

let mut list=vec![25,71,96]; let first=list[0]; list.push(62);

Copy instead of reference.

Rust

<entry><desc>result</desc><name>1</name></entry

<entry><desc>result</desc><name>1</name></entry>

Add closing >.

XML

$bar = 76; if ($bar = 76) {{}}

$bar = 76; if ($bar == 76) {{}}

Use ==.

PHP

let y: number = 'output';

let y: string = 'output';

Fix type.

TypeScript

int[] data = new int[94]; data[94] = 5;

int[] data = new int[94]; if (94 < data.length) data[94] = 5;

Check bounds.

Java

SELECT age email FROM items;

SELECT age, email FROM items;

Add comma.

SQL

b == '16'

b === 16

Use strict equality.

JavaScript

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

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

Throw Error objects.

JavaScript

if ($index = 100)

if ($index == 100)

Use ==.

Perl

var z int = 'info'

var z string = 'info'

Type mismatch.

Go

Correct.

XML

def handle(): print('info')

Indent function body.

Python

if (data = 58) {{}}

if (data == 58) {{}}

Use ==.

Java

package main func main() {{}}

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

Import needed.

Go

class = 'value'

class_name = 'value'

'class' is a keyword.

Python

<p>value <b>data</p></b>

<p>value <b>data</b></p>

Nest properly.

HTML

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

Correct.

Java

Colon missing.

Python

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

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

Make field public.

Java

Nest properly.

HTML

INSERT INTO products VALUES ('data',21)

INSERT INTO products (age, role) VALUES ('data',21);

Specify columns.

SQL

def process puts 'hello' end

Correct.

Ruby

if index = 90:

if index == 90:

Use == for comparison.

Python

p {{ color: #333 }}

p {{ color: #333; }}

Add semicolon.

CSS

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(45);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(45, () => console.log('listening'));

Add callback.

Node.js

Double quotes.

XML

<?php // code ?>

Correct.

PHP

if foo > 18 print('world')

if foo > 18: print('world')

Colon missing after if.

Python

data(27)

if length(data) >= 27, data(27), end

Check length.

MATLAB

data = info

data = 'info'

Quote strings.

Python

'test' + 38

'test' + str(38)

Can't add int to string.

Python

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

Correct.

Shell

function test(): void {{ return 69; }}

function test(): number {{ return 69; }}

Return type mismatch.

TypeScript

$values[96]

if ($values.Count -gt 96) {{ $values[96] }}

Check bounds.

PowerShell

const person:Person = {{name:'result'}};

const person:Person = {{name:'result', age:44}};

Add missing property.

TypeScript

Add comma.

JSON

Write-Host 'output'

Correct.

PowerShell

let x = 'message'

let x = "message"

Double quotes.

Swift

for (c in values)

for (c of values)

for...in iterates keys.

JavaScript

match x {{ 1 => {{}} }}

match x {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

function test() {{ return {{key:'value'}} }}

function test() {{ return {{key:'value'}}; }}

Return object on same line.

JavaScript

<br>

Self-closing.

HTML

bar

bar()

Add parentheses.

Kotlin

echo 'test'

echo 'test';

Add semicolon.

PHP

h1 {{ font-size:1px color:#fff; }}

h1 {{ font-size:1px; color:#fff; }}

Add semicolon.

CSS

echo world hello

echo 'world hello'

Quote to prevent splitting.

Shell

raise 'test'

raise Exception('test')

Raise needs an exception class.

Python

items[92]

if items.indices.contains(92) {{ items[92] }}

Check index.

Swift

if foo = 79

if foo == 79

Use ==.

Ruby

let z: Int = 'result'

let z: String = 'result'

Fix type.

Swift

values.forEach(function(a) {{ console.log(a); }})

values.forEach((a) => {{ console.log(a); }})

Arrow functions are cleaner.

JavaScript

baz

baz()

Add parentheses.

Swift

Add alt text.

HTML

val data: Int = 'message'

val data: String = 'message'

Fix type.

Kotlin

// comment

/* comment */

Use /* */.

CSS

UPDATE users SET name='world' WHERE email=8

UPDATE users SET name='world' WHERE email=8;

Add semicolon.

SQL

Add rel for security.

HTML

if (result = 21)

if (result == 21)

Use ==.

R

fn foo() -> i32 {{ 94 }}

Correct.

Rust

arr[84]

if (length(arr) >= 84) arr[84]

Check length.

R

assert item > 85

Correct.

Python

'world' + 88

'world' + 88.to_s

Convert int.

Ruby