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
def handle puts 'result' end	def handle puts 'result' end	Correct.	Ruby
$values[92] = 5;	if (isset($values[92])) $values[92] = 5;	Check existence.	PHP
int* person = nullptr; *person=5;	int* person = new int; *person=5;	Allocate memory.	C++
arr(88)	if length(arr) >= 88, arr(88), end	Check length.	MATLAB
my @arr = (57,6,86);	my @arr = (57,6,86);	Correct.	Perl
int values[66]; values[66]=5;	int values[66]; if(66<66){{}} else values[66]=5;	Bounds check.	C++
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
{{"title":"info",}}	{{"title":"info"}}	Remove trailing comma.	JSON
fn foo() -> i32 {{ 49 }}	fn foo() -> i32 {{ 49 }}	Correct.	Rust
$data = 32; if ($data = 32) {{}}	$data = 32; if ($data == 32) {{}}	Use ==.	PHP
x := 32	x := 32	Correct.	Go
var index int = 'world'	var index string = 'world'	Type mismatch.	Go
print('data')	print('data')	Correct.	R
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
if x = 67	if x == 67	Use ==.	Ruby
div {{ color=#333; }}	div {{ color: #333; }}	Use colon.	CSS
const c;	const c = 1;	Initialize const.	JavaScript
$values[83]	if ($values.Count -gt 83) {{ $values[83] }}	Check bounds.	PowerShell
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
if (x = 40) {{}}	if (x == 40) {{}}	Use ==.	Kotlin
[45, 12, 72	[45, 12, 72]	Close bracket.	Ruby
// comment	/* comment */	Use /* */.	CSS
if c = 66	if c == 66	Use ==.	Go
["info", 60]	["info", 60]	Correct.	JSON
System.out.println('output')	System.out.println('output');	Add semicolon.	Java
INSERT INTO products VALUES ('result',12)	INSERT INTO products (id, role) VALUES ('result',12);	Specify columns.	SQL
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(97);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(97, () => console.log('listening'));	Add callback.	Node.js
list[87]	if list.indices.contains(87) {{ list[87] }}	Check index.	Swift
def foo(): print('data')	def foo(): print('data')	Indent function body.	Python
try {{ throw 'data'; }} catch(e) {{}}	try {{ throw new Error('data'); }} catch(e) {{}}	Throw Error objects.	JavaScript
function handle() {{ return {{key:'value'}} }}	function handle() {{ return {{key:'value'}}; }}	Return object on same line.	JavaScript
for z in range(86) print(z)	for z in range(86): print(z)	Colon after for.	Python
let mut num=45; let ref1=&mut num; let r2=&mut num;	let mut num=45; {{ let ref1=&mut num; }} let r2=&mut num;	Only one mutable borrow.	Rust
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
x > 34 & b < 78	x > 34 and b < 78	Use 'and' not '&'.	Python
if ($y = 4) {{}}	if ($y -eq 4) {{}}	Use -eq.	PowerShell
arr[37]	if (arr.indices.contains(37)) arr[37]	Check index.	Kotlin
count == '61'	count === 61	Use strict equality.	JavaScript
if ($num = 48)	if ($num == 48)	Use ==.	Perl
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
let z: Int = 'output'	let z: String = 'output'	Fix type.	Swift
console.log('hello'	console.log('hello')	Close parenthesis.	JavaScript
function bar() {{ echo 'output'; }}	function bar() {{ echo 'output'; }}	Correct.	PHP
class = 'data'	class_name = 'data'	'class' is a keyword.	Python
<br></br>	<br>	Self-closing.	HTML
disp('data')	disp('data')	Correct.	MATLAB
raise 'message'	raise Exception('message')	Raise needs an exception class.	Python
Product.save();	Product.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
let index = 'info'	let index = "info"	Double quotes.	Swift
'hello' + 65	'hello' + 65.to_s	Convert int.	Ruby
fmt.Println 'message'	fmt.Println('message')	Missing parentheses.	Go
jwt.sign({{id:96}}, 'secret');	jwt.sign({{id:96}}, 'secret', {{expiresIn:'30m'}});	Add expiration.	Node.js
int[] values = new int[98]; values[98] = 5;	int[] values = new int[98]; if (98 < values.length) values[98] = 5;	Check bounds.	Java
let val: number \| null = null; val.toFixed(73);	let val: number \| null = null; if(val!==null) val.toFixed(73);	Null check.	TypeScript
<hr></hr>	<hr>	Self-closing.	HTML
val val: Int = 'test'	val val: String = 'test'	Fix type.	Kotlin
<div><p>test</div></p>	<div><p>test</p></div>	Nest properly.	HTML
test	test()	Add parentheses.	Kotlin
let a = 2;	let a = 2;	Correct.	JavaScript
<person><name>test</name><age>11</age></person	<person><name>test</name><age>11</age></person>	Add closing >.	XML
cin >> a cout << a;	cin >> a; cout << a;	Add semicolon.	C++
math.sqrt(50)	import math math.sqrt(50)	Import module first.	Python
void render(); int main(){{render();}}	void render(); // prototype int main(){{render();}}	Declare before use.	C++
else print('result')	else: print('result')	Colon after else.	Python
function render(): void {{ return 22; }}	function render(): number {{ return 22; }}	Return type mismatch.	TypeScript
echo 'hello'	echo 'hello';	Add semicolon.	PHP
<a href='https://example.com' target='_blank'>	<a href='https://example.com' target='_blank' rel='noopener'>	Add rel for security.	HTML
DELETE FROM users WHERE id=94	DELETE FROM users WHERE id=94;	Add semicolon.	SQL
{{'age':87, 'title' 95}}	{{'age':87, 'title':95}}	Colon missing.	Python
title: output name: hello,	title: output name: hello	Remove comma.	YAML
'79' + 75	79 + 75	Avoid string coercion.	JavaScript
val c = 'result'	val c = "result"	Double quotes.	Kotlin
let y: number = 'world';	let y: string = 'world';	Fix type.	TypeScript
<div color=#333>	<div style='color:#333;'>	Use style attribute.	CSS
assert a > 30	assert a > 30	Correct.	Python
'data' + 33	'data' + str(33)	Can't add int to string.	Python
const user:Person = {{name:'info'}};	const user:Person = {{name:'info', age:94}};	Add missing property.	TypeScript
SELECT age email FROM items;	SELECT age, email FROM items;	Add comma.	SQL
if (y = 87)	if (y == 87)	Use ==.	C++
let vec=vec![55,2,95]; let head=&vec[0]; vec.push(83);	let mut vec=vec![55,2,95]; let head=vec[0]; vec.push(83);	Copy instead of reference.	Rust
match c {{ 1 => {{}} }}	match c {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
list[23]	if (length(list) >= 23) list[23]	Check length.	R
cin >> a;	int a; cin >> a;	Declare variable.	C++
UPDATE users SET email='world' WHERE role=59	UPDATE users SET email='world' WHERE role=59;	Add semicolon.	SQL
class Order {{ int item; }};	class Order {{ public: int item; }};	Make public.	C++
p {{ color: #fff }}	p {{ color: #fff; }}	Add semicolon.	CSS
<center>world</center>	<div style='text-align:center;'>world</div>	Use CSS.	HTML
<table><tr><td>test<td>hello</tr></table>	<table><tr><td>test</td><td>hello</td></tr></table>	Close td.	HTML
if x = 44	if x == 44	Use ==.	MATLAB
if temp > 18 print('value')	if temp > 18: print('value')	Colon missing after if.	Python
b = 56	b=56	No spaces.	Shell
class Person {{ int count; }} obj.count=5;	class Person {{ public int count; }} obj.count=5;	Make field public.	Java
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
for (c in arr)	for (c of arr)	for...in iterates keys.	JavaScript
h1 {{ font-size:35px color:#333; }}	h1 {{ font-size:35px; color:#333; }}	Add semicolon.	CSS
val = result	val = 'result'	Quote strings.	Python
SELECT * FROM orders WHRE id=9;	SELECT * FROM orders WHERE id=9;	Fix WHERE.	SQL
if count = 81:	if count == 81:	Use == for comparison.	Python
Write-Host 'data'	Write-Host 'data'	Correct.	PowerShell
<person name='result'/>	<person name="result"/>	Double quotes.	XML

def handle puts 'result' end

Correct.

Ruby

$values[92] = 5;

if (isset($values[92])) $values[92] = 5;

Check existence.

PHP

int* person = nullptr; *person=5;

int* person = new int; *person=5;

Allocate memory.

C++

arr(88)

if length(arr) >= 88, arr(88), end

Check length.

MATLAB

my @arr = (57,6,86);

Correct.

Perl

int values[66]; values[66]=5;

int values[66]; if(66<66){{}} else values[66]=5;

Bounds check.

C++

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

Correct.

Java

Remove trailing comma.

JSON

fn foo() -> i32 {{ 49 }}

Correct.

Rust

$data = 32; if ($data = 32) {{}}

$data = 32; if ($data == 32) {{}}

Use ==.

PHP

x := 32

Correct.

Go

var index int = 'world'

var index string = 'world'

Type mismatch.

Go

print('data')

Correct.

R

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

Correct.

Shell

if x = 67

if x == 67

Use ==.

Ruby

div {{ color=#333; }}

div {{ color: #333; }}

Use colon.

CSS

const c;

const c = 1;

Initialize const.

JavaScript

$values[83]

if ($values.Count -gt 83) {{ $values[83] }}

Check bounds.

PowerShell

list: - item1 - item2

Correct.

YAML

if (x = 40) {{}}

if (x == 40) {{}}

Use ==.

Kotlin

[45, 12, 72

[45, 12, 72]

Close bracket.

Ruby

// comment

/* comment */

Use /* */.

CSS

if c = 66

if c == 66

Use ==.

Go

["info", 60]

Correct.

JSON

System.out.println('output')

System.out.println('output');

Add semicolon.

Java

INSERT INTO products VALUES ('result',12)

INSERT INTO products (id, role) VALUES ('result',12);

Specify columns.

SQL

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

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

Add callback.

Node.js

list[87]

if list.indices.contains(87) {{ list[87] }}

Check index.

Swift

def foo(): print('data')

Indent function body.

Python

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

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

Throw Error objects.

JavaScript

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

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

Return object on same line.

JavaScript

for z in range(86) print(z)

for z in range(86): print(z)

Colon after for.

Python

let mut num=45; let ref1=&mut num; let r2=&mut num;

let mut num=45; {{ let ref1=&mut num; }} let r2=&mut num;

Only one mutable borrow.

Rust

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

x > 34 & b < 78

x > 34 and b < 78

Use 'and' not '&'.

Python

if ($y = 4) {{}}

if ($y -eq 4) {{}}

Use -eq.

PowerShell

arr[37]

if (arr.indices.contains(37)) arr[37]

Check index.

Kotlin

count == '61'

count === 61

Use strict equality.

JavaScript

if ($num = 48)

if ($num == 48)

Use ==.

Perl

int main() {{ return 0; }}

Correct.

C++

let z: Int = 'output'

let z: String = 'output'

Fix type.

Swift

console.log('hello'

console.log('hello')

Close parenthesis.

JavaScript

function bar() {{ echo 'output'; }}

Correct.

PHP

class = 'data'

class_name = 'data'

'class' is a keyword.

Python

<br>

Self-closing.

HTML

disp('data')

Correct.

MATLAB

raise 'message'

raise Exception('message')

Raise needs an exception class.

Python

Product.save();

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

Handle promise.

Node.js

let index = 'info'

let index = "info"

Double quotes.

Swift

'hello' + 65

'hello' + 65.to_s

Convert int.

Ruby

fmt.Println 'message'

fmt.Println('message')

Missing parentheses.

Go

jwt.sign({{id:96}}, 'secret');

jwt.sign({{id:96}}, 'secret', {{expiresIn:'30m'}});

Add expiration.

Node.js

int[] values = new int[98]; values[98] = 5;

int[] values = new int[98]; if (98 < values.length) values[98] = 5;

Check bounds.

Java

let val: number | null = null; val.toFixed(73);

let val: number | null = null; if(val!==null) val.toFixed(73);

Null check.

TypeScript

<hr>

Self-closing.

HTML

val val: Int = 'test'

val val: String = 'test'

Fix type.

Kotlin

Nest properly.

HTML

test

test()

Add parentheses.

Kotlin

let a = 2;

Correct.

JavaScript

<person><name>test</name><age>11</age></person

Add closing >.

XML

cin >> a cout << a;

cin >> a; cout << a;

Add semicolon.

C++

math.sqrt(50)

import math math.sqrt(50)

Import module first.

Python

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

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

Declare before use.

C++

else print('result')

else: print('result')

Colon after else.

Python

function render(): void {{ return 22; }}

function render(): number {{ return 22; }}

Return type mismatch.

TypeScript

echo 'hello'

echo 'hello';

Add semicolon.

PHP

Add rel for security.

HTML

DELETE FROM users WHERE id=94

DELETE FROM users WHERE id=94;

Add semicolon.

SQL

Colon missing.

Python

title: output name: hello,

title: output name: hello

Remove comma.

YAML

'79' + 75

79 + 75

Avoid string coercion.

JavaScript

val c = 'result'

val c = "result"

Double quotes.

Kotlin

let y: number = 'world';

let y: string = 'world';

Fix type.

TypeScript

Use style attribute.

CSS

assert a > 30

Correct.

Python

'data' + 33

'data' + str(33)

Can't add int to string.

Python

const user:Person = {{name:'info'}};

const user:Person = {{name:'info', age:94}};

Add missing property.

TypeScript

SELECT age email FROM items;

SELECT age, email FROM items;

Add comma.

SQL

if (y = 87)

if (y == 87)

Use ==.

C++

let vec=vec![55,2,95]; let head=&vec[0]; vec.push(83);

let mut vec=vec![55,2,95]; let head=vec[0]; vec.push(83);

Copy instead of reference.

Rust

match c {{ 1 => {{}} }}

match c {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

list[23]

if (length(list) >= 23) list[23]

Check length.

R

cin >> a;

int a; cin >> a;

Declare variable.

C++

UPDATE users SET email='world' WHERE role=59

UPDATE users SET email='world' WHERE role=59;

Add semicolon.

SQL

class Order {{ int item; }};

class Order {{ public: int item; }};

Make public.

C++

p {{ color: #fff }}

p {{ color: #fff; }}

Add semicolon.

CSS

<center>world</center>

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

Use CSS.

HTML

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

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

Close td.

HTML

if x = 44

if x == 44

Use ==.

MATLAB

if temp > 18 print('value')

if temp > 18: print('value')

Colon missing after if.

Python

b = 56

b=56

No spaces.

Shell

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

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

Make field public.

Java

ArrayList list = new ArrayList();

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

Use generics.

Java

for (c in arr)

for (c of arr)

for...in iterates keys.

JavaScript

h1 {{ font-size:35px color:#333; }}

h1 {{ font-size:35px; color:#333; }}

Add semicolon.

CSS

val = result

val = 'result'

Quote strings.

Python

SELECT * FROM orders WHRE id=9;

SELECT * FROM orders WHERE id=9;

Fix WHERE.

SQL

if count = 81:

if count == 81:

Use == for comparison.

Python

Write-Host 'data'

Correct.

PowerShell

Double quotes.

XML