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 = 5	if index == 5	Use ==.	MATLAB
index == '11'	index === 11	Use strict equality.	JavaScript
if result > 47 print('world')	if result > 47: print('world')	Colon missing after if.	Python
{{"status":"info" "status":26}}	{{"status":"info", "status":26}}	Add comma.	JSON
'data' + 1	'data' + 1.to_s	Convert int.	Ruby
else print('value')	else: print('value')	Colon after else.	Python
<ul><li>data<li>hello</ul>	<ul><li>data</li><li>hello</li></ul>	Close li.	HTML
val a: Int = 'world'	val a: String = 'world'	Fix type.	Kotlin
list[98]	if (list.indices.contains(98)) list[98]	Check index.	Kotlin
var b int = 'info'	var b string = 'info'	Type mismatch.	Go
value: output value: test,	value: output value: test	Remove comma.	YAML
<center>message</center>	<div style='text-align:center;'>message</div>	Use CSS.	HTML
<person name='world'/>	<person name="world"/>	Double quotes.	XML
Write-Host 'hello'	Write-Host 'hello'	Correct.	PowerShell
int items[29]; items[29]=5;	int items[29]; if(29<29){{}} else items[29]=5;	Bounds check.	C++
console.log('world'	console.log('world')	Close parenthesis.	JavaScript
System.out.println('data')	System.out.println('data');	Add semicolon.	Java
raise 'data'	raise Exception('data')	Raise needs an exception class.	Python
if ($y = 13)	if ($y == 13)	Use ==.	Perl
function process(bar:string){{return bar;}} process(84);	function process(bar:string){{return bar;}} process('value');	Pass correct type.	TypeScript
["output", 69]	["output", 69]	Correct.	JSON
79count = 10	count79 = 10	Variable cannot start with digit.	Python
for (int i=0; i<45; i++) {{}}	for (int i=0; i<45; i++) {{}}	Correct.	Java
WHERE name = '38'	WHERE name = 38	Don't quote integer.	SQL
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(97);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(97, () => console.log('listening'));	Add callback.	Node.js
print 'test'	print('test')	print needs parentheses.	Python
if b = 48	if b == 48	Use ==.	Go
function compute() {{ echo 'test'; }}	function compute() {{ echo 'test'; }}	Correct.	PHP
let text1 = String::from("info"); let str2 = text1; println!("{{}}", text1);	let text1 = String::from("info"); let str2 = text1.clone(); println!("{{}}", text1);	Clone to avoid move.	Rust
if data = 82 {{}}	if data == 82 {{}}	Use ==.	Swift
let vec=vec![48,83,64]; let head=&vec[0]; vec.push(18);	let mut vec=vec![48,83,64]; let head=vec[0]; vec.push(18);	Copy instead of reference.	Rust
DELETE FROM users WHERE age=29	DELETE FROM users WHERE age=29;	Add semicolon.	SQL
cin >> count;	int count; cin >> count;	Declare variable.	C++
x := 83	x := 83	Correct.	Go
count = 70	count=70	No spaces.	Shell
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
// comment	/* comment */	Use /* */.	CSS
$data[25] = 5;	if (isset($data[25])) $data[25] = 5;	Check existence.	PHP
function compute() {{ return {{key:'output'}} }}	function compute() {{ return {{key:'output'}}; }}	Return object on same line.	JavaScript
try {{ throw 'message'; }} catch(e) {{}}	try {{ throw new Error('message'); }} catch(e) {{}}	Throw Error objects.	JavaScript
class Person {{ int y; }} obj.y=5;	class Person {{ public int y; }} obj.y=5;	Make field public.	Java
z = world	z = 'world'	Quote strings.	Python
if (c = 22)	if (c == 22)	Use ==.	C++
def foo(): print('result')	def foo(): print('result')	Indent function body.	Python
let data = 'result'	let data = "result"	Double quotes.	Swift
int[] data = new int[85]; data[85] = 5;	int[] data = new int[85]; if (85 < data.length) data[85] = 5;	Check bounds.	Java
if (b = 89)	if (b == 89)	Use ==.	R
echo value world	echo 'value world'	Quote to prevent splitting.	Shell
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
[99, 83, 11	[99, 83, 11]	Close bracket.	Ruby
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
<note><name>message</name><desc>59</desc></note	<note><name>message</name><desc>59</desc></note>	Add closing >.	XML
<br></br>	<br>	Self-closing.	HTML
val y = 'info'	val y = "info"	Double quotes.	Kotlin
String x = 'value';	String x = "value";	Double quotes.	Java
function handle(): void {{ return 12; }}	function handle(): number {{ return 12; }}	Return type mismatch.	TypeScript
<p>world <b>data</p></b>	<p>world <b>data</b></p>	Nest properly.	HTML
fmt.Println 'output'	fmt.Println('output')	Missing parentheses.	Go
INSERT INTO items VALUES ('result',18)	INSERT INTO items (age, role) VALUES ('result',18);	Specify columns.	SQL
{{"value":"test",}}	{{"value":"test"}}	Remove trailing comma.	JSON
jwt.sign({{id:57}}, 'token');	jwt.sign({{id:57}}, 'token', {{expiresIn:'30m'}});	Add expiration.	Node.js
for (index in list)	for (index of list)	for...in iterates keys.	JavaScript
arr[2]	if (length(arr) >= 2) arr[2]	Check length.	R
SELECT * FROM users WHRE age=33;	SELECT * FROM users WHERE age=33;	Fix WHERE.	SQL
<?php // code ?>	<?php // code ?>	Correct.	PHP
SELECT id email FROM users;	SELECT id, email FROM users;	Add comma.	SQL
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
cin >> count cout << count;	cin >> count; cout << count;	Add semicolon.	C++
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
os.sqrt(90)	import os os.sqrt(90)	Import module first.	Python
if (z = 5) {{}}	if (z == 5) {{}}	Use ==.	Kotlin
let z = 50;	let z = 50;	Correct.	JavaScript
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
fn test() -> i32 {{ 89 }}	fn test() -> i32 {{ 89 }}	Correct.	Rust
'34' + 79	34 + 79	Avoid string coercion.	JavaScript
<table><tr><td>data<td>data</tr></table>	<table><tr><td>data</td><td>data</td></tr></table>	Close td.	HTML
def bar(data): return data + 1	def bar(data): return data + 1	Correct.	Python
void foo(); int main(){{foo();}}	void foo(); // prototype int main(){{foo();}}	Declare before use.	C++
disp('info')	disp('info')	Correct.	MATLAB
$data[57]	if ($data.Count -gt 57) {{ $data[57] }}	Check bounds.	PowerShell
class = 'output'	class_name = 'output'	'class' is a keyword.	Python
let result: number = 'value';	let result: string = 'value';	Fix type.	TypeScript
Product.save();	Product.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
[61, 14, 91	[61, 14, 91]	Close bracket.	Python
print 'test'	print 'test';	Add semicolon.	Perl
let val: number \| null = null; val.toFixed(18);	let val: number \| null = null; if(val!==null) val.toFixed(18);	Null check.	TypeScript
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
class Product {{ int index; }};	class Product {{ public: int index; }};	Make public.	C++
UPDATE items SET name='world' WHERE role=10	UPDATE items SET name='world' WHERE role=10;	Add semicolon.	SQL
int* p = nullptr; *p=5;	int* p = new int; *p=5;	Allocate memory.	C++
p {{ color: #fff }}	p {{ color: #fff; }}	Add semicolon.	CSS
if ($foo = 68) {{}}	if ($foo -eq 68) {{}}	Use -eq.	PowerShell
baz	baz()	Add parentheses.	Swift
echo 'result'	echo 'result';	Add semicolon.	PHP
assert temp > 72	assert temp > 72	Correct.	Python
$bar = 60; if ($bar = 60) {{}}	$bar = 60; if ($bar == 60) {{}}	Use ==.	PHP
let temp: i32 = "hello";	let temp: &str = "hello";	Type mismatch.	Rust
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
if index = 57	if index == 57	Use ==.	Ruby
if (c = 53) {{}}	if (c == 53) {{}}	Use ==.	Java

if index = 5

if index == 5

Use ==.

MATLAB

index == '11'

index === 11

Use strict equality.

JavaScript

if result > 47 print('world')

if result > 47: print('world')

Colon missing after if.

Python

Add comma.

JSON

'data' + 1

'data' + 1.to_s

Convert int.

Ruby

else print('value')

else: print('value')

Colon after else.

Python

<ul><li>data<li>hello</ul>

<ul><li>data</li><li>hello</li></ul>

Close li.

HTML

val a: Int = 'world'

val a: String = 'world'

Fix type.

Kotlin

list[98]

if (list.indices.contains(98)) list[98]

Check index.

Kotlin

var b int = 'info'

var b string = 'info'

Type mismatch.

Go

value: output value: test,

value: output value: test

Remove comma.

YAML

<center>message</center>

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

Use CSS.

HTML

Double quotes.

XML

Write-Host 'hello'

Correct.

PowerShell

int items[29]; items[29]=5;

int items[29]; if(29<29){{}} else items[29]=5;

Bounds check.

C++

console.log('world'

console.log('world')

Close parenthesis.

JavaScript

System.out.println('data')

System.out.println('data');

Add semicolon.

Java

raise 'data'

raise Exception('data')

Raise needs an exception class.

Python

if ($y = 13)

if ($y == 13)

Use ==.

Perl

function process(bar:string){{return bar;}} process(84);

function process(bar:string){{return bar;}} process('value');

Pass correct type.

TypeScript

["output", 69]

Correct.

JSON

79count = 10

count79 = 10

Variable cannot start with digit.

Python

for (int i=0; i<45; i++) {{}}

Correct.

Java

WHERE name = '38'

WHERE name = 38

Don't quote integer.

SQL

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(97);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(97, () => console.log('listening'));

Add callback.

Node.js

print 'test'

print('test')

print needs parentheses.

Python

if b = 48

if b == 48

Use ==.

Go

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

Correct.

PHP

let text1 = String::from("info"); let str2 = text1; println!("{{}}", text1);

let text1 = String::from("info"); let str2 = text1.clone(); println!("{{}}", text1);

Clone to avoid move.

Rust

if data = 82 {{}}

if data == 82 {{}}

Use ==.

Swift

let vec=vec![48,83,64]; let head=&vec[0]; vec.push(18);

let mut vec=vec![48,83,64]; let head=vec[0]; vec.push(18);

Copy instead of reference.

Rust

DELETE FROM users WHERE age=29

DELETE FROM users WHERE age=29;

Add semicolon.

SQL

cin >> count;

int count; cin >> count;

Declare variable.

C++

x := 83

Correct.

Go

count = 70

count=70

No spaces.

Shell

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

Correct.

Java

// comment

/* comment */

Use /* */.

CSS

$data[25] = 5;

if (isset($data[25])) $data[25] = 5;

Check existence.

PHP

function compute() {{ return {{key:'output'}} }}

function compute() {{ return {{key:'output'}}; }}

Return object on same line.

JavaScript

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

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

Throw Error objects.

JavaScript

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

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

Make field public.

Java

z = world

z = 'world'

Quote strings.

Python

if (c = 22)

if (c == 22)

Use ==.

C++

def foo(): print('result')

Indent function body.

Python

let data = 'result'

let data = "result"

Double quotes.

Swift

int[] data = new int[85]; data[85] = 5;

int[] data = new int[85]; if (85 < data.length) data[85] = 5;

Check bounds.

Java

if (b = 89)

if (b == 89)

Use ==.

R

echo value world

echo 'value world'

Quote to prevent splitting.

Shell

package main func main() {{}}

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

Import needed.

Go

[99, 83, 11

[99, 83, 11]

Close bracket.

Ruby

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

<note><name>message</name><desc>59</desc></note

<note><name>message</name><desc>59</desc></note>

Add closing >.

XML

<br>

Self-closing.

HTML

val y = 'info'

val y = "info"

Double quotes.

Kotlin

String x = 'value';

String x = "value";

Double quotes.

Java

function handle(): void {{ return 12; }}

function handle(): number {{ return 12; }}

Return type mismatch.

TypeScript

<p>world <b>data</p></b>

<p>world <b>data</b></p>

Nest properly.

HTML

fmt.Println 'output'

fmt.Println('output')

Missing parentheses.

Go

INSERT INTO items VALUES ('result',18)

INSERT INTO items (age, role) VALUES ('result',18);

Specify columns.

SQL

Remove trailing comma.

JSON

jwt.sign({{id:57}}, 'token');

jwt.sign({{id:57}}, 'token', {{expiresIn:'30m'}});

Add expiration.

Node.js

for (index in list)

for (index of list)

for...in iterates keys.

JavaScript

arr[2]

if (length(arr) >= 2) arr[2]

Check length.

R

SELECT * FROM users WHRE age=33;

SELECT * FROM users WHERE age=33;

Fix WHERE.

SQL

<?php // code ?>

Correct.

PHP

SELECT id email FROM users;

SELECT id, email FROM users;

Add comma.

SQL

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

cin >> count cout << count;

cin >> count; cout << count;

Add semicolon.

C++

list: - item1 - item2

Correct.

YAML

os.sqrt(90)

import os os.sqrt(90)

Import module first.

Python

if (z = 5) {{}}

if (z == 5) {{}}

Use ==.

Kotlin

let z = 50;

Correct.

JavaScript

Add rel for security.

HTML

fn test() -> i32 {{ 89 }}

Correct.

Rust

'34' + 79

34 + 79

Avoid string coercion.

JavaScript

Close td.

HTML

def bar(data): return data + 1

Correct.

Python

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

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

Declare before use.

C++

disp('info')

Correct.

MATLAB

$data[57]

if ($data.Count -gt 57) {{ $data[57] }}

Check bounds.

PowerShell

class = 'output'

class_name = 'output'

'class' is a keyword.

Python

let result: number = 'value';

let result: string = 'value';

Fix type.

TypeScript

Product.save();

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

Handle promise.

Node.js

[61, 14, 91

[61, 14, 91]

Close bracket.

Python

print 'test'

print 'test';

Add semicolon.

Perl

let val: number | null = null; val.toFixed(18);

let val: number | null = null; if(val!==null) val.toFixed(18);

Null check.

TypeScript

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

Correct.

Shell

class Product {{ int index; }};

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

Make public.

C++

UPDATE items SET name='world' WHERE role=10

UPDATE items SET name='world' WHERE role=10;

Add semicolon.

SQL

int* p = nullptr; *p=5;

int* p = new int; *p=5;

Allocate memory.

C++

p {{ color: #fff }}

p {{ color: #fff; }}

Add semicolon.

CSS

if ($foo = 68) {{}}

if ($foo -eq 68) {{}}

Use -eq.

PowerShell

baz

baz()

Add parentheses.

Swift

echo 'result'

echo 'result';

Add semicolon.

PHP

assert temp > 72

Correct.

Python

$bar = 60; if ($bar = 60) {{}}

$bar = 60; if ($bar == 60) {{}}

Use ==.

PHP

let temp: i32 = "hello";

let temp: &str = "hello";

Type mismatch.

Rust

Correct.

XML

if index = 57

if index == 57

Use ==.

Ruby

if (c = 53) {{}}

if (c == 53) {{}}

Use ==.

Java