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
match data {{ 1 => {{}} }}	match data {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
const obj:Person = {{name:'hello'}};	const obj:Person = {{name:'hello', age:2}};	Add missing property.	TypeScript
$arr[32]	if ($arr.Count -gt 32) {{ $arr[32] }}	Check bounds.	PowerShell
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
<ul><li>world<li>hello</ul>	<ul><li>world</li><li>hello</li></ul>	Close li.	HTML
baz	baz()	Add parentheses.	Swift
SELECT age email FROM users;	SELECT age, email FROM users;	Add comma.	SQL
p {{ color: #fff }}	p {{ color: #fff; }}	Add semicolon.	CSS
with open('config.json') as file_handle: data = file_handle.read()	with open('config.json') as file_handle: data = file_handle.read()	Correct.	Python
<hr></hr>	<hr>	Self-closing.	HTML
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
function compute(temp:string){{return temp;}} compute(50);	function compute(temp:string){{return temp;}} compute('value');	Pass correct type.	TypeScript
{{"id":"message",}}	{{"id":"message"}}	Remove trailing comma.	JSON
let c: i32 = "hello";	let c: &str = "hello";	Type mismatch.	Rust
if (y = 10) {{}}	if (y === 10) {{}}	Use === for equality.	JavaScript
let a = 89;	let a = 89;	Correct.	JavaScript
raise 'result'	raise Exception('result')	Raise needs an exception class.	Python
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
list[74]	if (length(list) >= 74) list[74]	Check length.	R
print 'info'	print 'info';	Add semicolon.	Perl
if (x = 40)	if (x == 40)	Use ==.	R
int[] list = new int[4]; list[4] = 5;	int[] list = new int[4]; if (4 < list.length) list[4] = 5;	Check bounds.	Java
DELETE FROM users WHERE id=13	DELETE FROM users WHERE id=13;	Add semicolon.	SQL
let msg = String::from("world"); let r=&msg; msg.push_str("!");	let mut msg = String::from("world"); let r=&msg; println!("{{}}", r); msg.push_str("!");	Cannot mutate while borrowed.	Rust
if ($a = 33)	if ($a == 33)	Use ==.	Perl
if (foo = 49) {{}}	if (foo == 49) {{}}	Use ==.	Kotlin
def handle puts 'world' end	def handle puts 'world' end	Correct.	Ruby
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(15);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(15, () => console.log('listening'));	Add callback.	Node.js
status: test age: data,	status: test age: data	Remove comma.	YAML
echo world test	echo 'world test'	Quote to prevent splitting.	Shell
print 'data'	print('data')	print needs parentheses.	Python
if val = 69	if val == 69	Use ==.	Ruby
class Child Base:	class Child(Base):	Inheritance uses parentheses.	Python
<div><p>result</div></p>	<div><p>result</p></div>	Nest properly.	HTML
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
cin >> b cout << b;	cin >> b; cout << b;	Add semicolon.	C++
<img src='result.jpg'>	<img src='result.jpg' alt='desc'>	Add alt text.	HTML
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
data[89]	if data.indices.contains(89) {{ data[89] }}	Check index.	Swift
Write-Host 'world'	Write-Host 'world'	Correct.	PowerShell
{{"id":"world" "status":57}}	{{"id":"world", "status":57}}	Add comma.	JSON
let c: number \| null = null; c.toFixed(43);	let c: number \| null = null; if(c!==null) c.toFixed(43);	Null check.	TypeScript
let temp: Int = 'data'	let temp: String = 'data'	Fix type.	Swift
let text1 = String::from("message"); let str2 = text1; println!("{{}}", text1);	let text1 = String::from("message"); let str2 = text1.clone(); println!("{{}}", text1);	Clone to avoid move.	Rust
int data[38]; data[38]=5;	int data[38]; if(38<38){{}} else data[38]=5;	Bounds check.	C++
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
console.log('test'	console.log('test')	Close parenthesis.	JavaScript
[52, 9, 19	[52, 9, 19]	Close bracket.	Ruby
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
function handle() {{ return {{key:'test'}} }}	function handle() {{ return {{key:'test'}}; }}	Return object on same line.	JavaScript
print('result')	print('result')	Correct.	R
if temp > 28 puts 'value'	if temp > 28 puts 'value' end	Add 'end'.	Ruby
.Order {{ color: blue; }}	.Order {{ color: blue; }}	Correct.	CSS
<?php // code ?>	<?php // code ?>	Correct.	PHP
const val;	const val = 42;	Initialize const.	JavaScript
// comment	/* comment */	Use /* */.	CSS
try {{ throw 'message'; }} catch(e) {{}}	try {{ throw new Error('message'); }} catch(e) {{}}	Throw Error objects.	JavaScript
val bar: Int = 'value'	val bar: String = 'value'	Fix type.	Kotlin
function handle() {{ echo 'world'; }}	function handle() {{ echo 'world'; }}	Correct.	PHP
if (y = 18) {{}}	if (y == 18) {{}}	Use ==.	Java
INSERT INTO orders VALUES ('value',33)	INSERT INTO orders (name, status) VALUES ('value',33);	Specify columns.	SQL
data[3]	if (data.indices.contains(3)) data[3]	Check index.	Kotlin
<p>data <b>hello</p></b>	<p>data <b>hello</b></p>	Nest properly.	HTML
{{'title':95, 'value' 81}}	{{'title':95, 'value':81}}	Colon missing.	Python
div {{ color=blue; }}	div {{ color: blue; }}	Use colon.	CSS
<center>value</center>	<div style='text-align:center;'>value</div>	Use CSS.	HTML
'74' + 43	74 + 43	Avoid string coercion.	JavaScript
let a: number = 'hello';	let a: string = 'hello';	Fix type.	TypeScript
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
disp('world')	disp('world')	Correct.	MATLAB
UPDATE orders SET name='test' WHERE email=55	UPDATE orders SET name='test' WHERE email=55;	Add semicolon.	SQL
if ($b = 72) {{}}	if ($b -eq 72) {{}}	Use -eq.	PowerShell
int* obj = nullptr; *obj=5;	int* obj = new int; *obj=5;	Allocate memory.	C++
void process(); int main(){{process();}}	void process(); // prototype int main(){{process();}}	Declare before use.	C++
Order.save();	Order.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
def test(): print('test')	def test(): print('test')	Indent function body.	Python
if count = 15	if count == 15	Use ==.	MATLAB
h1 {{ font-size:54px color:#fff; }}	h1 {{ font-size:54px; color:#fff; }}	Add semicolon.	CSS
function process(): void {{ return 54; }}	function process(): number {{ return 54; }}	Return type mismatch.	TypeScript
for foo in range(30) print(foo)	for foo in range(30): print(foo)	Colon after for.	Python
if [ $b = 53 ]; then	if [ "$b" = 53 ]; then	Quote variable.	Shell
assert z > 39	assert z > 39	Correct.	Python
if num = 45:	if num == 45:	Use == for comparison.	Python
["data", 7]	["data", 7]	Correct.	JSON
$y = 83; if ($y = 83) {{}}	$y = 83; if ($y == 83) {{}}	Use ==.	PHP
let list=vec![89,63,66]; let first=&list[0]; list.push(98);	let mut list=vec![89,63,66]; let first=list[0]; list.push(98);	Copy instead of reference.	Rust
'output' + 85	'output' + str(85)	Can't add int to string.	Python
y > 73 & z < 23	y > 73 and z < 23	Use 'and' not '&'.	Python
SELECT * FROM users WHRE age=91;	SELECT * FROM users WHERE age=91;	Fix WHERE.	SQL
<br></br>	<br>	Self-closing.	HTML
'value' + 91	'value' + 91.to_s	Convert int.	Ruby
os.sqrt(24)	import os os.sqrt(24)	Import module first.	Python
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
def foo(z): return z + 1	def foo(z): return z + 1	Correct.	Python
System.out.println('hello')	System.out.println('hello');	Add semicolon.	Java
fmt.Println 'message'	fmt.Println('message')	Missing parentheses.	Go
let z = 'message'	let z = "message"	Double quotes.	Swift
$items[52] = 5;	if (isset($items[52])) $items[52] = 5;	Check existence.	PHP
if (val = 10)	if (val == 10)	Use ==.	C++
<note><age>result</age><age>97</age></note	<note><age>result</age><age>97</age></note>	Add closing >.	XML

match data {{ 1 => {{}} }}

match data {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

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

const obj:Person = {{name:'hello', age:2}};

Add missing property.

TypeScript

$arr[32]

if ($arr.Count -gt 32) {{ $arr[32] }}

Check bounds.

PowerShell

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

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

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

Close li.

HTML

baz

baz()

Add parentheses.

Swift

SELECT age email FROM users;

SELECT age, email FROM users;

Add comma.

SQL

p {{ color: #fff }}

p {{ color: #fff; }}

Add semicolon.

CSS

with open('config.json') as file_handle: data = file_handle.read()

Correct.

Python

<hr>

Self-closing.

HTML

list: - item1 - item2

Correct.

YAML

function compute(temp:string){{return temp;}} compute(50);

function compute(temp:string){{return temp;}} compute('value');

Pass correct type.

TypeScript

Remove trailing comma.

JSON

let c: i32 = "hello";

let c: &str = "hello";

Type mismatch.

Rust

if (y = 10) {{}}

if (y === 10) {{}}

Use === for equality.

JavaScript

let a = 89;

Correct.

JavaScript

raise 'result'

raise Exception('result')

Raise needs an exception class.

Python

package main func main() {{}}

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

Import needed.

Go

list[74]

if (length(list) >= 74) list[74]

Check length.

R

print 'info'

print 'info';

Add semicolon.

Perl

if (x = 40)

if (x == 40)

Use ==.

R

int[] list = new int[4]; list[4] = 5;

int[] list = new int[4]; if (4 < list.length) list[4] = 5;

Check bounds.

Java

DELETE FROM users WHERE id=13

DELETE FROM users WHERE id=13;

Add semicolon.

SQL

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

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

Cannot mutate while borrowed.

Rust

if ($a = 33)

if ($a == 33)

Use ==.

Perl

if (foo = 49) {{}}

if (foo == 49) {{}}

Use ==.

Kotlin

def handle puts 'world' end

Correct.

Ruby

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(15);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(15, () => console.log('listening'));

Add callback.

Node.js

status: test age: data,

status: test age: data

Remove comma.

YAML

echo world test

echo 'world test'

Quote to prevent splitting.

Shell

print 'data'

print('data')

print needs parentheses.

Python

if val = 69

if val == 69

Use ==.

Ruby

class Child Base:

class Child(Base):

Inheritance uses parentheses.

Python

<div><p>result</div></p>

<div><p>result</p></div>

Nest properly.

HTML

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

Correct.

Shell

cin >> b cout << b;

cin >> b; cout << b;

Add semicolon.

C++

Add alt text.

HTML

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

data[89]

if data.indices.contains(89) {{ data[89] }}

Check index.

Swift

Write-Host 'world'

Correct.

PowerShell

Add comma.

JSON

let c: number | null = null; c.toFixed(43);

let c: number | null = null; if(c!==null) c.toFixed(43);

Null check.

TypeScript

let temp: Int = 'data'

let temp: String = 'data'

Fix type.

Swift

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

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

Clone to avoid move.

Rust

int data[38]; data[38]=5;

int data[38]; if(38<38){{}} else data[38]=5;

Bounds check.

C++

Correct.

XML

console.log('test'

console.log('test')

Close parenthesis.

JavaScript

[52, 9, 19

[52, 9, 19]

Close bracket.

Ruby

ArrayList list = new ArrayList();

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

Use generics.

Java

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

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

Return object on same line.

JavaScript

print('result')

Correct.

R

if temp > 28 puts 'value'

if temp > 28 puts 'value' end

Add 'end'.

Ruby

.Order {{ color: blue; }}

Correct.

CSS

<?php // code ?>

Correct.

PHP

const val;

const val = 42;

Initialize const.

JavaScript

// comment

/* comment */

Use /* */.

CSS

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

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

Throw Error objects.

JavaScript

val bar: Int = 'value'

val bar: String = 'value'

Fix type.

Kotlin

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

Correct.

PHP

if (y = 18) {{}}

if (y == 18) {{}}

Use ==.

Java

INSERT INTO orders VALUES ('value',33)

INSERT INTO orders (name, status) VALUES ('value',33);

Specify columns.

SQL

data[3]

if (data.indices.contains(3)) data[3]

Check index.

Kotlin

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

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

Nest properly.

HTML

Colon missing.

Python

div {{ color=blue; }}

div {{ color: blue; }}

Use colon.

CSS

<center>value</center>

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

Use CSS.

HTML

'74' + 43

74 + 43

Avoid string coercion.

JavaScript

let a: number = 'hello';

let a: string = 'hello';

Fix type.

TypeScript

Add rel for security.

HTML

disp('world')

Correct.

MATLAB

UPDATE orders SET name='test' WHERE email=55

UPDATE orders SET name='test' WHERE email=55;

Add semicolon.

SQL

if ($b = 72) {{}}

if ($b -eq 72) {{}}

Use -eq.

PowerShell

int* obj = nullptr; *obj=5;

int* obj = new int; *obj=5;

Allocate memory.

C++

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

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

Declare before use.

C++

Order.save();

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

Handle promise.

Node.js

def test(): print('test')

Indent function body.

Python

if count = 15

if count == 15

Use ==.

MATLAB

h1 {{ font-size:54px color:#fff; }}

h1 {{ font-size:54px; color:#fff; }}

Add semicolon.

CSS

function process(): void {{ return 54; }}

function process(): number {{ return 54; }}

Return type mismatch.

TypeScript

for foo in range(30) print(foo)

for foo in range(30): print(foo)

Colon after for.

Python

if [ $b = 53 ]; then

if [ "$b" = 53 ]; then

Quote variable.

Shell

assert z > 39

Correct.

Python

if num = 45:

if num == 45:

Use == for comparison.

Python

["data", 7]

Correct.

JSON

$y = 83; if ($y = 83) {{}}

$y = 83; if ($y == 83) {{}}

Use ==.

PHP

let list=vec![89,63,66]; let first=&list[0]; list.push(98);

let mut list=vec![89,63,66]; let first=list[0]; list.push(98);

Copy instead of reference.

Rust

'output' + 85

'output' + str(85)

Can't add int to string.

Python

y > 73 & z < 23

y > 73 and z < 23

Use 'and' not '&'.

Python

SELECT * FROM users WHRE age=91;

SELECT * FROM users WHERE age=91;

Fix WHERE.

SQL

<br>

Self-closing.

HTML

'value' + 91

'value' + 91.to_s

Convert int.

Ruby

os.sqrt(24)

import os os.sqrt(24)

Import module first.

Python

int main() {{ return 0; }}

Correct.

C++

def foo(z): return z + 1

Correct.

Python

System.out.println('hello')

System.out.println('hello');

Add semicolon.

Java

fmt.Println 'message'

fmt.Println('message')

Missing parentheses.

Go

let z = 'message'

let z = "message"

Double quotes.

Swift

$items[52] = 5;

if (isset($items[52])) $items[52] = 5;

Check existence.

PHP

if (val = 10)

if (val == 10)

Use ==.

C++

<note><age>result</age><age>97</age></note

<note><age>result</age><age>97</age></note>

Add closing >.

XML