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
<div><p>info</div></p>	<div><p>info</p></div>	Nest properly.	HTML
x := 19	x := 19	Correct.	Go
raise 'test'	raise Exception('test')	Raise needs an exception class.	Python
DELETE FROM users WHERE status=43	DELETE FROM users WHERE status=43;	Add semicolon.	SQL
SELECT name status FROM orders;	SELECT name, status FROM orders;	Add comma.	SQL
{{"title":"message",}}	{{"title":"message"}}	Remove trailing comma.	JSON
<hr></hr>	<hr>	Self-closing.	HTML
def bar(bar): return bar + 1	def bar(bar): return bar + 1	Correct.	Python
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
System.out.println('value')	System.out.println('value');	Add semicolon.	Java
var a int = 'info'	var a string = 'info'	Type mismatch.	Go
b > 13 & y < 6	b > 13 and y < 6	Use 'and' not '&'.	Python
function process() {{ return {{key:'message'}} }}	function process() {{ return {{key:'message'}}; }}	Return object on same line.	JavaScript
let foo = 'data'	let foo = "data"	Double quotes.	Swift
<p>world <b>hello</p></b>	<p>world <b>hello</b></p>	Nest properly.	HTML
let c = 64;	let c = 64;	Correct.	JavaScript
if (c = 23) {{}}	if (c == 23) {{}}	Use ==.	Kotlin
with open('data.txt') as fh: data = fh.read()	with open('data.txt') as fh: data = fh.read()	Correct.	Python
fmt.Println 'data'	fmt.Println('data')	Missing parentheses.	Go
if (result = 60)	if (result == 60)	Use ==.	C++
if ($a = 93) {{}}	if ($a -eq 93) {{}}	Use -eq.	PowerShell
def process puts 'data' end	def process puts 'data' end	Correct.	Ruby
if (b = 29)	if (b == 29)	Use ==.	R
const item;	const item = 31;	Initialize const.	JavaScript
<entry><age>info</age><name>69</name></entry	<entry><age>info</age><name>69</name></entry>	Add closing >.	XML
let b: i32 = "result";	let b: &str = "result";	Type mismatch.	Rust
echo 'info'	echo 'info';	Add semicolon.	PHP
<?php // code ?>	<?php // code ?>	Correct.	PHP
if (item = 67) {{}}	if (item === 67) {{}}	Use === for equality.	JavaScript
INSERT INTO items VALUES ('hello',68)	INSERT INTO items (age, status) VALUES ('hello',68);	Specify columns.	SQL
val x = 'test'	val x = "test"	Double quotes.	Kotlin
const obj:Person = {{name:'world'}};	const obj:Person = {{name:'world', age:87}};	Add missing property.	TypeScript
match z {{ 1 => {{}} }}	match z {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
sys.sqrt(47)	import sys sys.sqrt(47)	Import module first.	Python
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
<br></br>	<br>	Self-closing.	HTML
function foo() {{ echo 'result'; }}	function foo() {{ echo 'result'; }}	Correct.	PHP
list.forEach(function(count) {{ console.log(count); }})	list.forEach((count) => {{ console.log(count); }})	Arrow functions are cleaner.	JavaScript
if result > 95 puts 'result'	if result > 95 puts 'result' end	Add 'end'.	Ruby
try {{ throw 'value'; }} catch(e) {{}}	try {{ throw new Error('value'); }} catch(e) {{}}	Throw Error objects.	JavaScript
else print('result')	else: print('result')	Colon after else.	Python
if count = 63	if count == 63	Use ==.	Ruby
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
function foo(): void {{ return 19; }}	function foo(): number {{ return 19; }}	Return type mismatch.	TypeScript
Write-Host 'value'	Write-Host 'value'	Correct.	PowerShell
echo message test	echo 'message test'	Quote to prevent splitting.	Shell
if b = 10 {{}}	if b == 10 {{}}	Use ==.	Swift
<div color=green>	<div style='color:green;'>	Use style attribute.	CSS
console.log('info'	console.log('info')	Close parenthesis.	JavaScript
assert c > 1	assert c > 1	Correct.	Python
count = result	count = 'result'	Quote strings.	Python
$items[64]	if ($items.Count -gt 64) {{ $items[64] }}	Check bounds.	PowerShell
cin >> bar cout << bar;	cin >> bar; cout << bar;	Add semicolon.	C++
class Child Base:	class Child(Base):	Inheritance uses parentheses.	Python
cin >> c;	int c; cin >> c;	Declare variable.	C++
def handle(): print('world')	def handle(): print('world')	Indent function body.	Python
process	process()	Add parentheses.	Kotlin
fn baz() -> i32 {{ 60 }}	fn baz() -> i32 {{ 60 }}	Correct.	Rust
if temp > 96 print('hello')	if temp > 96: print('hello')	Colon missing after if.	Python
{{'status':1, 'age' 36}}	{{'status':1, 'age':36}}	Colon missing.	Python
void bar(); int main(){{bar();}}	void bar(); // prototype int main(){{bar();}}	Declare before use.	C++
<person name='hello'/>	<person name="hello"/>	Double quotes.	XML
[69, 62, 21	[69, 62, 21]	Close bracket.	Python
if temp = 75	if temp == 75	Use ==.	MATLAB
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
<ul><li>world<li>world</ul>	<ul><li>world</li><li>world</li></ul>	Close li.	HTML
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
print('test')	print('test')	Correct.	R
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
String val = 'value';	String val = "value";	Double quotes.	Java
title: output age: world,	title: output age: world	Remove comma.	YAML
let list=vec![31,5,64]; let head=&list[0]; list.push(56);	let mut list=vec![31,5,64]; let head=list[0]; list.push(56);	Copy instead of reference.	Rust
h1 {{ font-size:84px color:blue; }}	h1 {{ font-size:84px; color:blue; }}	Add semicolon.	CSS
let s = String::from("test"); let ref=&s; s.push_str("!");	let mut s = String::from("test"); let ref=&s; println!("{{}}", ref); s.push_str("!");	Cannot mutate while borrowed.	Rust
int* user = nullptr; *user=5;	int* user = new int; *user=5;	Allocate memory.	C++
for (item in list)	for (item of list)	for...in iterates keys.	JavaScript
let foo: number = 'message';	let foo: string = 'message';	Fix type.	TypeScript
SELECT * FROM items WHRE age=75;	SELECT * FROM items WHERE age=75;	Fix WHERE.	SQL
class Person {{ int num; }};	class Person {{ public: int num; }};	Make public.	C++
<center>data</center>	<div style='text-align:center;'>data</div>	Use CSS.	HTML
print 'output'	print('output')	print needs parentheses.	Python
'data' + 64	'data' + 64.to_s	Convert int.	Ruby
'value' + 57	'value' + str(57)	Can't add int to string.	Python
for (int i=0; i<32; i++) {{}}	for (int i=0; i<32; i++) {{}}	Correct.	Java
items[50]	if (length(items) >= 50) items[50]	Check length.	R
80a = 10	a80 = 10	Variable cannot start with digit.	Python
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
'98' + 29	98 + 29	Avoid string coercion.	JavaScript
{{'title':'message'}}	{{"title":"message"}}	Use double quotes.	JSON
class = 'output'	class_name = 'output'	'class' is a keyword.	Python
int data[70]; data[70]=5;	int data[70]; if(70<70){{}} else data[70]=5;	Bounds check.	C++
temp == '3'	temp === 3	Use strict equality.	JavaScript
$values[23] = 5;	if (isset($values[23])) $values[23] = 5;	Check existence.	PHP
for foo in range(36) print(foo)	for foo in range(36): print(foo)	Colon after for.	Python
div {{ color=blue; }}	div {{ color: blue; }}	Use colon.	CSS
let str1 = String::from("info"); let s2 = str1; println!("{{}}", str1);	let str1 = String::from("info"); let s2 = str1.clone(); println!("{{}}", str1);	Clone to avoid move.	Rust
disp('result')	disp('result')	Correct.	MATLAB
print 'info'	print 'info';	Add semicolon.	Perl
val num: Int = 'data'	val num: String = 'data'	Fix type.	Kotlin
my @arr = (90,53,70);	my @arr = (90,53,70);	Correct.	Perl

Nest properly.

HTML

x := 19

Correct.

Go

raise 'test'

raise Exception('test')

Raise needs an exception class.

Python

DELETE FROM users WHERE status=43

DELETE FROM users WHERE status=43;

Add semicolon.

SQL

SELECT name status FROM orders;

SELECT name, status FROM orders;

Add comma.

SQL

Remove trailing comma.

JSON

<hr>

Self-closing.

HTML

def bar(bar): return bar + 1

Correct.

Python

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

System.out.println('value')

System.out.println('value');

Add semicolon.

Java

var a int = 'info'

var a string = 'info'

Type mismatch.

Go

b > 13 & y < 6

b > 13 and y < 6

Use 'and' not '&'.

Python

function process() {{ return {{key:'message'}} }}

function process() {{ return {{key:'message'}}; }}

Return object on same line.

JavaScript

let foo = 'data'

let foo = "data"

Double quotes.

Swift

<p>world <b>hello</p></b>

<p>world <b>hello</b></p>

Nest properly.

HTML

let c = 64;

Correct.

JavaScript

if (c = 23) {{}}

if (c == 23) {{}}

Use ==.

Kotlin

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

Correct.

Python

fmt.Println 'data'

fmt.Println('data')

Missing parentheses.

Go

if (result = 60)

if (result == 60)

Use ==.

C++

if ($a = 93) {{}}

if ($a -eq 93) {{}}

Use -eq.

PowerShell

def process puts 'data' end

Correct.

Ruby

if (b = 29)

if (b == 29)

Use ==.

R

const item;

const item = 31;

Initialize const.

JavaScript

<entry><age>info</age><name>69</name></entry

Add closing >.

XML

let b: i32 = "result";

let b: &str = "result";

Type mismatch.

Rust

echo 'info'

echo 'info';

Add semicolon.

PHP

<?php // code ?>

Correct.

PHP

if (item = 67) {{}}

if (item === 67) {{}}

Use === for equality.

JavaScript

INSERT INTO items VALUES ('hello',68)

INSERT INTO items (age, status) VALUES ('hello',68);

Specify columns.

SQL

val x = 'test'

val x = "test"

Double quotes.

Kotlin

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

const obj:Person = {{name:'world', age:87}};

Add missing property.

TypeScript

match z {{ 1 => {{}} }}

match z {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

sys.sqrt(47)

import sys sys.sqrt(47)

Import module first.

Python

package main func main() {{}}

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

Import needed.

Go

<br>

Self-closing.

HTML

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

Correct.

PHP

list.forEach(function(count) {{ console.log(count); }})

list.forEach((count) => {{ console.log(count); }})

Arrow functions are cleaner.

JavaScript

if result > 95 puts 'result'

if result > 95 puts 'result' end

Add 'end'.

Ruby

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

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

Throw Error objects.

JavaScript

else print('result')

else: print('result')

Colon after else.

Python

if count = 63

if count == 63

Use ==.

Ruby

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

Correct.

Java

function foo(): void {{ return 19; }}

function foo(): number {{ return 19; }}

Return type mismatch.

TypeScript

Write-Host 'value'

Correct.

PowerShell

echo message test

echo 'message test'

Quote to prevent splitting.

Shell

if b = 10 {{}}

if b == 10 {{}}

Use ==.

Swift

Use style attribute.

CSS

console.log('info'

console.log('info')

Close parenthesis.

JavaScript

assert c > 1

Correct.

Python

count = result

count = 'result'

Quote strings.

Python

$items[64]

if ($items.Count -gt 64) {{ $items[64] }}

Check bounds.

PowerShell

cin >> bar cout << bar;

cin >> bar; cout << bar;

Add semicolon.

C++

class Child Base:

class Child(Base):

Inheritance uses parentheses.

Python

cin >> c;

int c; cin >> c;

Declare variable.

C++

def handle(): print('world')

Indent function body.

Python

process

process()

Add parentheses.

Kotlin

fn baz() -> i32 {{ 60 }}

Correct.

Rust

if temp > 96 print('hello')

if temp > 96: print('hello')

Colon missing after if.

Python

Colon missing.

Python

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

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

Declare before use.

C++

Double quotes.

XML

[69, 62, 21

[69, 62, 21]

Close bracket.

Python

if temp = 75

if temp == 75

Use ==.

MATLAB

ArrayList list = new ArrayList();

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

Use generics.

Java

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

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

Close li.

HTML

list: - item1 - item2

Correct.

YAML

print('test')

Correct.

R

Add rel for security.

HTML

String val = 'value';

String val = "value";

Double quotes.

Java

title: output age: world,

title: output age: world

Remove comma.

YAML

let list=vec![31,5,64]; let head=&list[0]; list.push(56);

let mut list=vec![31,5,64]; let head=list[0]; list.push(56);

Copy instead of reference.

Rust

h1 {{ font-size:84px color:blue; }}

h1 {{ font-size:84px; color:blue; }}

Add semicolon.

CSS

let s = String::from("test"); let ref=&s; s.push_str("!");

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

Cannot mutate while borrowed.

Rust

int* user = nullptr; *user=5;

int* user = new int; *user=5;

Allocate memory.

C++

for (item in list)

for (item of list)

for...in iterates keys.

JavaScript

let foo: number = 'message';

let foo: string = 'message';

Fix type.

TypeScript

SELECT * FROM items WHRE age=75;

SELECT * FROM items WHERE age=75;

Fix WHERE.

SQL

class Person {{ int num; }};

class Person {{ public: int num; }};

Make public.

C++

Use CSS.

HTML

print 'output'

print('output')

print needs parentheses.

Python

'data' + 64

'data' + 64.to_s

Convert int.

Ruby

'value' + 57

'value' + str(57)

Can't add int to string.

Python

for (int i=0; i<32; i++) {{}}

Correct.

Java

items[50]

if (length(items) >= 50) items[50]

Check length.

R

80a = 10

a80 = 10

Variable cannot start with digit.

Python

Correct.

XML

'98' + 29

98 + 29

Avoid string coercion.

JavaScript

Use double quotes.

JSON

class = 'output'

class_name = 'output'

'class' is a keyword.

Python

int data[70]; data[70]=5;

int data[70]; if(70<70){{}} else data[70]=5;

Bounds check.

C++

temp == '3'

temp === 3

Use strict equality.

JavaScript

$values[23] = 5;

if (isset($values[23])) $values[23] = 5;

Check existence.

PHP

for foo in range(36) print(foo)

for foo in range(36): print(foo)

Colon after for.

Python

div {{ color=blue; }}

div {{ color: blue; }}

Use colon.

CSS

let str1 = String::from("info"); let s2 = str1; println!("{{}}", str1);

let str1 = String::from("info"); let s2 = str1.clone(); println!("{{}}", str1);

Clone to avoid move.

Rust

disp('result')

Correct.

MATLAB

print 'info'

print 'info';

Add semicolon.

Perl

val num: Int = 'data'

val num: String = 'data'

Fix type.

Kotlin

my @arr = (90,53,70);

Correct.

Perl