Gugu8/Code-Syntax-Expanded · Datasets at Hugging Face

wrong_code stringlengths 3 123	correct_code stringlengths 3 155	explanation stringclasses 101 values	language stringclasses 26 values
div {{ color=#333; }}	div {{ color: #333; }}	Use colon.	CSS
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
if (x = 47)	if (x == 47)	Use ==.	R
Write-Host 'data'	Write-Host 'data'	Correct.	PowerShell
if y = 21	if y == 21	Use ==.	MATLAB
DELETE FROM items WHERE status=49	DELETE FROM items WHERE status=49;	Add semicolon.	SQL
String name = 'result';	String name = 'result';	Correct.	Dart
<entry name='hello'/>	<entry name="hello"/>	Double quotes.	XML
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
p {{ color: #333 }}	p {{ color: #333; }}	Add semicolon.	CSS
SELECT * FROM products WHRE id=56;	SELECT * FROM products WHERE id=56;	Fix WHERE.	SQL
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
List(60,32,63)	List(60,32,63)	Correct.	Scala
if temp > 27 print('output')	if temp > 27: print('output')	Colon missing after if.	Python
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
let b: number \| null = null; b.toFixed(56);	let b: number \| null = null; if(b!==null) b.toFixed(56);	Null check.	TypeScript
[56, 12, 9	[56, 12, 9]	Close bracket.	Ruby
const obj:Person = {{name:'hello'}};	const obj:Person = {{name:'hello', age:26}};	Add missing property.	TypeScript
switch(result){{ case 29: break; }}	switch(result){{ case 29: break; default: break; }}	Add default case.	Java
val x = 4; x = 35	var x = 4; x = 35	Use var for reassignment.	Scala
<p>message <b>data</p></b>	<p>message <b>data</b></p>	Nest properly.	HTML
fmt.Println 'world'	fmt.Println('world')	Missing parentheses.	Go
def process(): print('info')	def process(): print('info')	Indent function body.	Python
if num = 77 {{}}	if num == 77 {{}}	Use ==.	Swift
arr.forEach(function(count) {{ console.log(count); }})	arr.forEach((count) => {{ console.log(count); }})	Arrow functions are cleaner.	JavaScript
function compute() {{ echo 'world'; }}	function compute() {{ echo 'world'; }}	Correct.	PHP
fn foo() -> i32 {{ 59 }}	fn foo() -> i32 {{ 59 }}	Correct.	Rust
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
let mut foo=80; let ref1=&mut foo; let r2=&mut foo;	let mut foo=80; {{ let ref1=&mut foo; }} let r2=&mut foo;	Only one mutable borrow.	Rust
let item = 63; item += 1;	let mut item = 63; item += 1;	Need mut to modify.	Rust
z > 12 & z < 25	z > 12 and z < 25	Use 'and' not '&'.	Python
int* obj = nullptr; *obj=5;	int* obj = new int; *obj=5;	Allocate memory.	C++
raise 'test'	raise Exception('test')	Raise needs an exception class.	Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
let s1 = String::from("test"); let text2 = s1; println!("{{}}", s1);	let s1 = String::from("test"); let text2 = s1.clone(); println!("{{}}", s1);	Clone to avoid move.	Rust
<img src='output.jpg'>	<img src='output.jpg' alt='desc'>	Add alt text.	HTML
[22, 10, 63	[22, 10, 63]	Close bracket.	Python
Post.save();	Post.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
if val = 55	if val == 55	Use ==.	Ruby
WHERE email = '96'	WHERE email = 96	Don't quote integer.	SQL
var x int = 'hello'	var x string = 'hello'	Type mismatch.	Go
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
{ "name": "message" }	{ "name": "message" }	Correct.	JSON
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
'18' + 78	18 + 78	Avoid string coercion.	JavaScript
if (index = 68) {}	if (index == 68) {}	Use ==.	Dart
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
<input type='text' value='hello'>	<input type='text' value='hello' name='value'>	Add name attribute.	HTML
if index = 94:	if index == 94:	Use == for comparison.	Python
UPDATE items SET id='info' WHERE email=64	UPDATE items SET id='info' WHERE email=64;	Add semicolon.	SQL
65item = 10	item65 = 10	Variable cannot start with digit.	Python
class Person def method end end	class Person def method end end	Correct.	Ruby
class Person {{ int b; }};	class Person {{ public: int b; }};	Make public.	C++
echo message data	echo 'message data'	Quote to prevent splitting.	Shell
name: test age: 96	name: test age: 96	Correct.	YAML
System.out.println('message')	System.out.println('message');	Add semicolon.	Java
[x*x for x in arr if x > 35]	[x*x for x in arr if x > 35]	Correct list comprehension.	Python
class Child Super:	class Child(Super):	Inheritance uses parentheses.	Python
JOIN profiles ON items.id = profiles.email	JOIN profiles ON items.id = profiles.email	Correct.	SQL
let str = String::from("message"); let borrow=&str; str.push_str("!");	let mut str = String::from("message"); let borrow=&str; println!("{{}}", borrow); str.push_str("!");	Cannot mutate while borrowed.	Rust
if (z = 59) {{}}	if (z == 59) {{}}	Use ==.	Kotlin
if (item = 84) {{}}	if (item === 84) {{}}	Use === for equality.	JavaScript
for (foo in values)	for (foo of values)	for...in iterates keys.	JavaScript
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
.Person {{ color: #fff; }}	.Person {{ color: #fff; }}	Correct.	CSS
<br></br>	<br>	Self-closing.	HTML
let temp: Int = 'data'	let temp: String = 'data'	Fix type.	Swift
disp('world')	disp('world')	Correct.	MATLAB
{{'status':'hello'}}	{{"status":"hello"}}	Use double quotes.	JSON
{{'title':23, 'title' 30}}	{{'title':23, 'title':30}}	Colon missing.	Python
if (num) console.log('yes') else console.log('no')	if (num) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
{{"value":"value",}}	{{"value":"value"}}	Remove trailing comma.	JSON
<person age=4>	<person age="4">	Quote attribute.	XML
id: message age: test,	id: message age: test	Remove comma.	YAML
$b = 20; if ($b = 20) {{}}	$b = 20; if ($b == 20) {{}}	Use ==.	PHP
#content {{ color: green; }}	#content {{ color: green; }}	Correct.	CSS
var x = 18;	var x = 18;	Correct.	Dart
else print('output')	else: print('output')	Colon after else.	Python
h1 {{ font-size:6px color:green; }}	h1 {{ font-size:6px; color:green; }}	Add semicolon.	CSS
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
<?php // code ?>	<?php // code ?>	Correct.	PHP
<hr></hr>	<hr>	Self-closing.	HTML
list(4)	if length(list) >= 4, list(4), end	Check length.	MATLAB
<table><tr><td>test<td>data</tr></table>	<table><tr><td>test</td><td>data</td></tr></table>	Close td.	HTML
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
if (b = 27)	if (b == 27)	Use ==.	Scala
let b = 68;	let b = 68;	Correct.	JavaScript
for val in range(72) print(val)	for val in range(72): print(val)	Colon after for.	Python
if ($bar = 62) {{}}	if ($bar -eq 62) {{}}	Use -eq.	PowerShell
function baz(item:string){{return item;}} baz(4);	function baz(item:string){{return item;}} baz('message');	Pass correct type.	TypeScript
const val;	const val = 66;	Initialize const.	JavaScript
while read line; do echo $line; done < config.json	while read line; do echo $line; done < config.json	Correct.	Shell
print('output')	print('output')	Correct.	R
sys.sqrt(31)	import sys sys.sqrt(31)	Import module first.	Python
print 'message'	print('message')	print needs parentheses.	Python
'message' + 57	'message' + 57.to_s	Convert int.	Ruby
println('info')	println("info")	Double quotes.	Scala
if item = 20 then print('world') end	if item == 20 then print('world') end	Use ==.	Lua
function compute() {{ return {{key:'test'}} }}	function compute() {{ return {{key:'test'}}; }}	Return object on same line.	JavaScript

div {{ color=#333; }}

div {{ color: #333; }}

Use colon.

CSS

lambda x: x+1

Correct lambda.

Python

if (x = 47)

if (x == 47)

Use ==.

R

Write-Host 'data'

Correct.

PowerShell

if y = 21

if y == 21

Use ==.

MATLAB

DELETE FROM items WHERE status=49

DELETE FROM items WHERE status=49;

Add semicolon.

SQL

String name = 'result';

Correct.

Dart

Double quotes.

XML

x = 5; if x > 3, disp('large'), end

Correct.

MATLAB

p {{ color: #333 }}

p {{ color: #333; }}

Add semicolon.

CSS

SELECT * FROM products WHRE id=56;

SELECT * FROM products WHERE id=56;

Fix WHERE.

SQL

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

List(60,32,63)

Correct.

Scala

if temp > 27 print('output')

if temp > 27: print('output')

Colon missing after if.

Python

List<int> list = [1,2,3];

Correct.

Dart

list: - item1 - item2

Correct.

YAML

let b: number | null = null; b.toFixed(56);

let b: number | null = null; if(b!==null) b.toFixed(56);

Null check.

TypeScript

[56, 12, 9

[56, 12, 9]

Close bracket.

Ruby

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

const obj:Person = {{name:'hello', age:26}};

Add missing property.

TypeScript

switch(result){{ case 29: break; }}

switch(result){{ case 29: break; default: break; }}

Add default case.

Java

val x = 4; x = 35

var x = 4; x = 35

Use var for reassignment.

Scala

<p>message <b>data</p></b>

<p>message <b>data</b></p>

Nest properly.

HTML

fmt.Println 'world'

fmt.Println('world')

Missing parentheses.

Go

def process(): print('info')

Indent function body.

Python

if num = 77 {{}}

if num == 77 {{}}

Use ==.

Swift

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

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

Arrow functions are cleaner.

JavaScript

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

Correct.

PHP

fn foo() -> i32 {{ 59 }}

Correct.

Rust

@media screen {{ body {{}} }}

Correct.

CSS

let mut foo=80; let ref1=&mut foo; let r2=&mut foo;

let mut foo=80; {{ let ref1=&mut foo; }} let r2=&mut foo;

Only one mutable borrow.

Rust

let item = 63; item += 1;

let mut item = 63; item += 1;

Need mut to modify.

Rust

z > 12 & z < 25

z > 12 and z < 25

Use 'and' not '&'.

Python

int* obj = nullptr; *obj=5;

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

Allocate memory.

C++

raise 'test'

raise Exception('test')

Raise needs an exception class.

Python

$x = 5; if ($x -eq 5) { Write-Host 'yes' }

Correct.

PowerShell

let s1 = String::from("test"); let text2 = s1; println!("{{}}", s1);

let s1 = String::from("test"); let text2 = s1.clone(); println!("{{}}", s1);

Clone to avoid move.

Rust

Add alt text.

HTML

[22, 10, 63

[22, 10, 63]

Close bracket.

Python

Post.save();

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

Handle promise.

Node.js

if val = 55

if val == 55

Use ==.

Ruby

WHERE email = '96'

WHERE email = 96

Don't quote integer.

SQL

var x int = 'hello'

var x string = 'hello'

Type mismatch.

Go

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

{ "name": "message" }

Correct.

JSON

x <- 5; if (x > 3) print('large')

Correct.

R

'18' + 78

18 + 78

Avoid string coercion.

JavaScript

if (index = 68) {}

if (index == 68) {}

Use ==.

Dart

int x; System.out.println(x);

int x = 0; System.out.println(x);

Initialize variable.

Java

Add name attribute.

HTML

if index = 94:

if index == 94:

Use == for comparison.

Python

UPDATE items SET id='info' WHERE email=64

UPDATE items SET id='info' WHERE email=64;

Add semicolon.

SQL

65item = 10

item65 = 10

Variable cannot start with digit.

Python

class Person def method end end

Correct.

Ruby

class Person {{ int b; }};

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

Make public.

C++

echo message data

echo 'message data'

Quote to prevent splitting.

Shell

name: test age: 96

Correct.

YAML

System.out.println('message')

System.out.println('message');

Add semicolon.

Java

[x*x for x in arr if x > 35]

Correct list comprehension.

Python

class Child Super:

class Child(Super):

Inheritance uses parentheses.

Python

JOIN profiles ON items.id = profiles.email

Correct.

SQL

let str = String::from("message"); let borrow=&str; str.push_str("!");

let mut str = String::from("message"); let borrow=&str; println!("{{}}", borrow); str.push_str("!");

Cannot mutate while borrowed.

Rust

if (z = 59) {{}}

if (z == 59) {{}}

Use ==.

Kotlin

if (item = 84) {{}}

if (item === 84) {{}}

Use === for equality.

JavaScript

for (foo in values)

for (foo of values)

for...in iterates keys.

JavaScript

package main func main() {{}}

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

Import needed.

Go

.Person {{ color: #fff; }}

Correct.

CSS

<br>

Self-closing.

HTML

let temp: Int = 'data'

let temp: String = 'data'

Fix type.

Swift

disp('world')

Correct.

MATLAB

Use double quotes.

JSON

Colon missing.

Python

if (num) console.log('yes') else console.log('no')

if (num) console.log('yes'); else console.log('no');

Missing semicolon.

JavaScript

Remove trailing comma.

JSON

Quote attribute.

XML

id: message age: test,

id: message age: test

Remove comma.

YAML

$b = 20; if ($b = 20) {{}}

$b = 20; if ($b == 20) {{}}

Use ==.

PHP

#content {{ color: green; }}

Correct.

CSS

var x = 18;

Correct.

Dart

else print('output')

else: print('output')

Colon after else.

Python

h1 {{ font-size:6px color:green; }}

h1 {{ font-size:6px; color:green; }}

Add semicolon.

CSS

Add rel for security.

HTML

<?php // code ?>

Correct.

PHP

<hr>

Self-closing.

HTML

list(4)

if length(list) >= 4, list(4), end

Check length.

MATLAB

Close td.

HTML

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

if (b = 27)

if (b == 27)

Use ==.

Scala

let b = 68;

Correct.

JavaScript

for val in range(72) print(val)

for val in range(72): print(val)

Colon after for.

Python

if ($bar = 62) {{}}

if ($bar -eq 62) {{}}

Use -eq.

PowerShell

function baz(item:string){{return item;}} baz(4);

function baz(item:string){{return item;}} baz('message');

Pass correct type.

TypeScript

const val;

const val = 66;

Initialize const.

JavaScript

while read line; do echo $line; done < config.json

Correct.

Shell

print('output')

Correct.

R

sys.sqrt(31)

import sys sys.sqrt(31)

Import module first.

Python

print 'message'

print('message')

print needs parentheses.

Python

'message' + 57

'message' + 57.to_s

Convert int.

Ruby

println('info')

println("info")

Double quotes.

Scala

if item = 20 then print('world') end

if item == 20 then print('world') end

Use ==.

Lua

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

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

Return object on same line.

JavaScript