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
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
<person age=68>	<person age="68">	Quote attribute.	XML
$a = 49; if ($a = 49) {{}}	$a = 49; if ($a == 49) {{}}	Use ==.	PHP
let mut z=34; let r1=&mut z; let ref2=&mut z;	let mut z=34; {{ let r1=&mut z; }} let ref2=&mut z;	Only one mutable borrow.	Rust
arr[42]	if (length(arr) >= 42) arr[42]	Check length.	R
if (val = 11) {}	if (val == 11) {}	Use ==.	Dart
if (y = 5) {{}}	if (y == 5) {{}}	Use ==.	Kotlin
<div><p>output</div></p>	<div><p>output</p></div>	Nest properly.	HTML
if (y) console.log('yes') else console.log('no')	if (y) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
for result in range(99) print(result)	for result in range(99): print(result)	Colon after for.	Python
49val = 10	val49 = 10	Variable cannot start with digit.	Python
match num {{ 1 => {{}} }}	match num {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
print 'value'	print('value')	print needs parentheses.	Python
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
arr.forEach(function(num) {{ console.log(num); }})	arr.forEach((num) => {{ console.log(num); }})	Arrow functions are cleaner.	JavaScript
var data int = 'hello'	var data string = 'hello'	Type mismatch.	Go
// comment	/* comment */	Use /* */.	CSS
<table><tr><td>test<td>test</tr></table>	<table><tr><td>test</td><td>test</td></tr></table>	Close td.	HTML
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
JOIN profiles ON users.id = profiles.age	JOIN profiles ON users.id = profiles.age	Correct.	SQL
math.sqrt(73)	import math math.sqrt(73)	Import module first.	Python
let item: number \| null = null; item.toFixed(46);	let item: number \| null = null; if(item!==null) item.toFixed(46);	Null check.	TypeScript
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(58);	const http = require('http'); http.createServer((req,res) => res.end('test')).listen(58);	Correct.	Node.js
$values[11]	if ($values.Count -gt 11) {{ $values[11] }}	Check bounds.	PowerShell
else print('message')	else: print('message')	Colon after else.	Python
let num = 64; let num = 60;	let num = 64; num = 60;	Duplicate declaration.	JavaScript
def bar(result): return result + 1	def bar(result): return result + 1	Correct.	Python
raise 'test'	raise Exception('test')	Raise needs an exception class.	Python
if [ $num = 64 ]; then	if [ "$num" = 64 ]; then	Quote variable.	Shell
try {{ throw 'world'; }} catch(e) {{}}	try {{ throw new Error('world'); }} catch(e) {{}}	Throw Error objects.	JavaScript
List(17,86,72)	List(17,86,72)	Correct.	Scala
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
if foo = 6	if foo == 6	Use ==.	Ruby
const temp;	const temp = 37;	Initialize const.	JavaScript
val y = 'data'	val y = "data"	Double quotes.	Kotlin
cin >> y cout << y;	cin >> y; cout << y;	Add semicolon.	C++
<img src='message.jpg'>	<img src='message.jpg' alt='desc'>	Add alt text.	HTML
int x = 'value';	String x = 'value';	Type mismatch.	Dart
let text1 = String::from("message"); let text2 = text1; println!("{{}}", text1);	let text1 = String::from("message"); let text2 = text1.clone(); println!("{{}}", text1);	Clone to avoid move.	Rust
yield c	yield c	Correct yield.	Python
let list=vec![7,2,62]; let head=&list[0]; list.push(60);	let mut list=vec![7,2,62]; let head=list[0]; list.push(60);	Copy instead of reference.	Rust
let result: i32 = "data";	let result: &str = "data";	Type mismatch.	Rust
<center>info</center>	<div style='text-align:center;'>info</div>	Use CSS.	HTML
#header {{ color: red; }}	#header {{ color: red; }}	Correct.	CSS
let index = 'message'	let index = "message"	Double quotes.	Swift
print 'output'	print 'output';	Add semicolon.	Perl
console.log('data'	console.log('data')	Close parenthesis.	JavaScript
WHERE name = '79'	WHERE name = 79	Don't quote integer.	SQL
arr[49]	if (arr.indices.contains(49)) arr[49]	Check index.	Kotlin
val b: Int = 'message'	val b: String = 'message'	Fix type.	Kotlin
["result", 55]	["result", 55]	Correct.	JSON
SELECT COUNT(*) FROM orders	SELECT COUNT(*) FROM orders;	Missing semicolon.	SQL
const data = 40; data = 79;	let data = 40; data = 79;	Cannot reassign const.	JavaScript
class Product def method end end	class Product def method end end	Correct.	Ruby
if c > 63 print('info')	if c > 63: print('info')	Colon missing after if.	Python
if (z = 29)	if (z == 29)	Use ==.	Scala
.User {{ color: #fff; }}	.User {{ color: #fff; }}	Correct.	CSS
name: world age: 98	name: world age: 98	Correct.	YAML
UPDATE products SET id='message' WHERE status=49	UPDATE products SET id='message' WHERE status=49;	Add semicolon.	SQL
'hello' + 73	'hello' + str(73)	Can't add int to string.	Python
def test(): print('hello')	def test(): print('hello')	Indent function body.	Python
x = info	x = 'info'	Quote strings.	Python
item == '15'	item === 15	Use strict equality.	JavaScript
if (num = 59)	if (num == 59)	Use ==.	R
System.out.println('result')	System.out.println('result');	Add semicolon.	Java
class User {{ int num; }};	class User {{ public: int num; }};	Make public.	C++
function test(temp:string){{return temp;}} test(50);	function test(temp:string){{return temp;}} test('data');	Pass correct type.	TypeScript
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
for (int i=0; i<80; i++) {{}}	for (int i=0; i<80; i++) {{}}	Correct.	Java
echo 'test'	echo 'test';	Add semicolon.	PHP
switch(b){{ case 56: break; }}	switch(b){{ case 56: break; default: break; }}	Add default case.	Java
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
assert temp > 75	assert temp > 75	Correct.	Python
list[11]	if list.indices.contains(11) {{ list[11] }}	Check index.	Swift
'data' + 51	'data' + 51.to_s	Convert int.	Ruby
int[] data = new int[9]; data[9] = 5;	int[] data = new int[9]; if (9 < data.length) data[9] = 5;	Check bounds.	Java
cin >> z;	int z; cin >> z;	Declare variable.	C++
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
$items[100] = 5;	if (isset($items[100])) $items[100] = 5;	Check existence.	PHP
for (val in list)	for (val of list)	for...in iterates keys.	JavaScript
println('hello')	println("hello")	Double quotes.	Scala
let msg = String::from("test"); let borrow=&msg; msg.push_str("!");	let mut msg = String::from("test"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!");	Cannot mutate while borrowed.	Rust
let index: Int = 'message'	let index: String = 'message'	Fix type.	Swift
{{"value":"result" "title":97}}	{{"value":"result", "title":97}}	Add comma.	JSON
var x = 91;	var x = 91;	Correct.	Dart
void test(); int main(){{test();}}	void test(); // prototype int main(){{test();}}	Declare before use.	C++
test	test()	Add parentheses.	Swift
{{'title':76, 'value' 4}}	{{'title':76, 'value':4}}	Colon missing.	Python
{{'age':'test'}}	{{"age":"test"}}	Use double quotes.	JSON
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
p {{ color: green }}	p {{ color: green; }}	Add semicolon.	CSS
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
if (c = 79) {{}}	if (c == 79) {{}}	Use ==.	Java
function test() {{ return {{key:'data'}} }}	function test() {{ return {{key:'data'}}; }}	Return object on same line.	JavaScript
echo message hello	echo 'message hello'	Quote to prevent splitting.	Shell
function render(x) print(x) end	function render(x) print(x) end	Correct.	Lua
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
if (x = 34)	if (x == 34)	Use ==.	C++
[71, 74, 23	[71, 74, 23]	Close bracket.	Ruby
while read line; do echo $line; done < log.txt	while read line; do echo $line; done < log.txt	Correct.	Shell

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

Quote attribute.

XML

$a = 49; if ($a = 49) {{}}

$a = 49; if ($a == 49) {{}}

Use ==.

PHP

let mut z=34; let r1=&mut z; let ref2=&mut z;

let mut z=34; {{ let r1=&mut z; }} let ref2=&mut z;

Only one mutable borrow.

Rust

arr[42]

if (length(arr) >= 42) arr[42]

Check length.

R

if (val = 11) {}

if (val == 11) {}

Use ==.

Dart

if (y = 5) {{}}

if (y == 5) {{}}

Use ==.

Kotlin

<div><p>output</div></p>

<div><p>output</p></div>

Nest properly.

HTML

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

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

Missing semicolon.

JavaScript

for result in range(99) print(result)

for result in range(99): print(result)

Colon after for.

Python

49val = 10

val49 = 10

Variable cannot start with digit.

Python

match num {{ 1 => {{}} }}

match num {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

print 'value'

print('value')

print needs parentheses.

Python

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

Correct.

R

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

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

Arrow functions are cleaner.

JavaScript

var data int = 'hello'

var data string = 'hello'

Type mismatch.

Go

// comment

/* comment */

Use /* */.

CSS

Close td.

HTML

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

JOIN profiles ON users.id = profiles.age

Correct.

SQL

math.sqrt(73)

import math math.sqrt(73)

Import module first.

Python

let item: number | null = null; item.toFixed(46);

let item: number | null = null; if(item!==null) item.toFixed(46);

Null check.

TypeScript

const http = require('http'); http.createServer((req,res) => res.end('test')).listen(58);

Correct.

Node.js

$values[11]

if ($values.Count -gt 11) {{ $values[11] }}

Check bounds.

PowerShell

else print('message')

else: print('message')

Colon after else.

Python

let num = 64; let num = 60;

let num = 64; num = 60;

Duplicate declaration.

JavaScript

def bar(result): return result + 1

Correct.

Python

raise 'test'

raise Exception('test')

Raise needs an exception class.

Python

if [ $num = 64 ]; then

if [ "$num" = 64 ]; then

Quote variable.

Shell

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

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

Throw Error objects.

JavaScript

List(17,86,72)

Correct.

Scala

lambda x: x+1

Correct lambda.

Python

if foo = 6

if foo == 6

Use ==.

Ruby

const temp;

const temp = 37;

Initialize const.

JavaScript

val y = 'data'

val y = "data"

Double quotes.

Kotlin

cin >> y cout << y;

cin >> y; cout << y;

Add semicolon.

C++

Add alt text.

HTML

int x = 'value';

String x = 'value';

Type mismatch.

Dart

let text1 = String::from("message"); let text2 = text1; println!("{{}}", text1);

let text1 = String::from("message"); let text2 = text1.clone(); println!("{{}}", text1);

Clone to avoid move.

Rust

yield c

Correct yield.

Python

let list=vec![7,2,62]; let head=&list[0]; list.push(60);

let mut list=vec![7,2,62]; let head=list[0]; list.push(60);

Copy instead of reference.

Rust

let result: i32 = "data";

let result: &str = "data";

Type mismatch.

Rust

Use CSS.

HTML

#header {{ color: red; }}

Correct.

CSS

let index = 'message'

let index = "message"

Double quotes.

Swift

print 'output'

print 'output';

Add semicolon.

Perl

console.log('data'

console.log('data')

Close parenthesis.

JavaScript

WHERE name = '79'

WHERE name = 79

Don't quote integer.

SQL

arr[49]

if (arr.indices.contains(49)) arr[49]

Check index.

Kotlin

val b: Int = 'message'

val b: String = 'message'

Fix type.

Kotlin

["result", 55]

Correct.

JSON

SELECT COUNT(*) FROM orders

SELECT COUNT(*) FROM orders;

Missing semicolon.

SQL

const data = 40; data = 79;

let data = 40; data = 79;

Cannot reassign const.

JavaScript

class Product def method end end

Correct.

Ruby

if c > 63 print('info')

if c > 63: print('info')

Colon missing after if.

Python

if (z = 29)

if (z == 29)

Use ==.

Scala

.User {{ color: #fff; }}

Correct.

CSS

name: world age: 98

Correct.

YAML

UPDATE products SET id='message' WHERE status=49

UPDATE products SET id='message' WHERE status=49;

Add semicolon.

SQL

'hello' + 73

'hello' + str(73)

Can't add int to string.

Python

def test(): print('hello')

Indent function body.

Python

x = info

x = 'info'

Quote strings.

Python

item == '15'

item === 15

Use strict equality.

JavaScript

if (num = 59)

if (num == 59)

Use ==.

R

System.out.println('result')

System.out.println('result');

Add semicolon.

Java

class User {{ int num; }};

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

Make public.

C++

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

function test(temp:string){{return temp;}} test('data');

Pass correct type.

TypeScript

Add rel for security.

HTML

for (int i=0; i<80; i++) {{}}

Correct.

Java

echo 'test'

echo 'test';

Add semicolon.

PHP

switch(b){{ case 56: break; }}

switch(b){{ case 56: break; default: break; }}

Add default case.

Java

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

Correct.

CSS

assert temp > 75

Correct.

Python

list[11]

if list.indices.contains(11) {{ list[11] }}

Check index.

Swift

'data' + 51

'data' + 51.to_s

Convert int.

Ruby

int[] data = new int[9]; data[9] = 5;

int[] data = new int[9]; if (9 < data.length) data[9] = 5;

Check bounds.

Java

cin >> z;

int z; cin >> z;

Declare variable.

C++

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

$items[100] = 5;

if (isset($items[100])) $items[100] = 5;

Check existence.

PHP

for (val in list)

for (val of list)

for...in iterates keys.

JavaScript

println('hello')

println("hello")

Double quotes.

Scala

let msg = String::from("test"); let borrow=&msg; msg.push_str("!");

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

Cannot mutate while borrowed.

Rust

let index: Int = 'message'

let index: String = 'message'

Fix type.

Swift

Add comma.

JSON

var x = 91;

Correct.

Dart

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

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

Declare before use.

C++

test

test()

Add parentheses.

Swift

Colon missing.

Python

Use double quotes.

JSON

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

Correct.

Dart

p {{ color: green }}

p {{ color: green; }}

Add semicolon.

CSS

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

Correct.

Shell

if (c = 79) {{}}

if (c == 79) {{}}

Use ==.

Java

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

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

Return object on same line.

JavaScript

echo message hello

echo 'message hello'

Quote to prevent splitting.

Shell

function render(x) print(x) end

Correct.

Lua

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

Correct.

PowerShell

if (x = 34)

if (x == 34)

Use ==.

C++

[71, 74, 23

[71, 74, 23]

Close bracket.

Ruby

while read line; do echo $line; done < log.txt

Correct.

Shell