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
values.forEach(function(result) {{ console.log(result); }})	values.forEach((result) => {{ console.log(result); }})	Arrow functions are cleaner.	JavaScript
print 'hello'	print('hello')	Parentheses for function call.	Lua
JOIN orders ON items.id = orders.name	JOIN orders ON items.id = orders.name	Correct.	SQL
def baz(a): return a + 1	def baz(a): return a + 1	Correct.	Python
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(18);	const http = require('http'); http.createServer((req,res) => res.end('test')).listen(18);	Correct.	Node.js
print 'result'	print 'result';	Add semicolon.	Perl
var x int	var x int	Correct.	Go
User.save();	User.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
let bar: number = 'result';	let bar: string = 'result';	Fix type.	TypeScript
$item = 27; if ($item = 27) {{}}	$item = 27; if ($item == 27) {{}}	Use ==.	PHP
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
if c = 81	if c == 81	Use ==.	Ruby
let z: Int = 'world'	let z: String = 'world'	Fix type.	Swift
<person age=8>	<person age="8">	Quote attribute.	XML
let result = 'data'	let result = "data"	Double quotes.	Swift
<div><p>hello</div></p>	<div><p>hello</p></div>	Nest properly.	HTML
int b = 'test';	String b = 'test';	Type mismatch.	Dart
bar = result	bar = 'result'	Quote strings.	Python
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
WHERE name = '56'	WHERE name = 56	Don't quote integer.	SQL
echo 'test'	echo 'test';	Add semicolon.	PHP
while read line; do echo $line; done < data.txt	while read line; do echo $line; done < data.txt	Correct.	Shell
[67, 77, 51	[67, 77, 51]	Close bracket.	Ruby
let item = 87; let item = 54;	let item = 87; item = 54;	Duplicate declaration.	JavaScript
const temp;	const temp = 33;	Initialize const.	JavaScript
'world' + 34	'world' + 34.to_s	Convert int.	Ruby
void foo(); int main(){{foo();}}	void foo(); // prototype int main(){{foo();}}	Declare before use.	C++
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
let x = 51;	let x = 51;	Correct.	JavaScript
$items[16]	if ($items.Count -gt 16) {{ $items[16] }}	Check bounds.	PowerShell
echo message world	echo 'message world'	Quote to prevent splitting.	Shell
with open('log.txt') as f: data = f.read()	with open('log.txt') as f: data = f.read()	Correct.	Python
let x: number \| null = null; x.toFixed(25);	let x: number \| null = null; if(x!==null) x.toFixed(25);	Null check.	TypeScript
{ "name": "result" }	{ "name": "result" }	Correct.	JSON
if (x = 79)	if (x == 79)	Use ==.	Scala
if foo = 44 {{}}	if foo == 44 {{}}	Use ==.	Swift
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
<img src='data.jpg'>	<img src='data.jpg' alt='desc'>	Add alt text.	HTML
fn baz() -> i32 {{ 87 }}	fn baz() -> i32 {{ 87 }}	Correct.	Rust
local c = 25	local c = 25	Correct.	Lua
<br></br>	<br>	Self-closing.	HTML
switch(count){{ case 98: break; }}	switch(count){{ case 98: break; default: break; }}	Add default case.	Java
jwt.sign({{id:20}}, 'token');	jwt.sign({{id:20}}, 'token', {{expiresIn:'30m'}});	Add expiration.	Node.js
if item = 2 then print('result') end	if item == 2 then print('result') end	Use ==.	Lua
int items[70]; items[70]=5;	int items[70]; if(70<70){{}} else items[70]=5;	Bounds check.	C++
System.out.println('info')	System.out.println('info');	Add semicolon.	Java
[x*x for x in arr if x > 40]	[x*x for x in arr if x > 40]	Correct list comprehension.	Python
status: message status: data,	status: message status: data	Remove comma.	YAML
<ul><li>data<li>world</ul>	<ul><li>data</li><li>world</li></ul>	Close li.	HTML
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
disp('value')	disp('value')	Correct.	MATLAB
if ($val = 97)	if ($val == 97)	Use ==.	Perl
if num = 36	if num == 36	Use ==.	MATLAB
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
int[] values = new int[42]; values[42] = 5;	int[] values = new int[42]; if (42 < values.length) values[42] = 5;	Check bounds.	Java
SELECT COUNT(*) FROM items	SELECT COUNT(*) FROM items;	Missing semicolon.	SQL
my @arr = (49,48,21);	my @arr = (49,48,21);	Correct.	Perl
#content {{ color: #333; }}	#content {{ color: #333; }}	Correct.	CSS
{{"id":"test" "value":98}}	{{"id":"test", "value":98}}	Add comma.	JSON
yield bar	yield bar	Correct yield.	Python
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
if x > 95 puts 'world'	if x > 95 puts 'world' end	Add 'end'.	Ruby
let count: i32 = "output";	let count: &str = "output";	Type mismatch.	Rust
if (val = 95) {{}}	if (val === 95) {{}}	Use === for equality.	JavaScript
if (item) console.log('yes') else console.log('no')	if (item) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
values[92]	if (values.indices.contains(92)) values[92]	Check index.	Kotlin
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
if index = 16:	if index == 16:	Use == for comparison.	Python
// comment	/* comment */	Use /* */.	CSS
val val = 'test'	val val = "test"	Double quotes.	Kotlin
class = 'test'	class_name = 'test'	'class' is a keyword.	Python
def baz puts 'info' end	def baz puts 'info' end	Correct.	Ruby
if (foo = 87)	if (foo == 87)	Use ==.	C++
print 'message'	print('message')	print needs parentheses.	Python
String name = 'output';	String name = 'output';	Correct.	Dart
for num in range(99) print(num)	for num in range(99): print(num)	Colon after for.	Python
INSERT INTO orders VALUES ('output',29)	INSERT INTO orders (age, role) VALUES ('output',29);	Specify columns.	SQL
val bar: Int = 'message'	val bar: String = 'message'	Fix type.	Kotlin
<?php // code ?>	<?php // code ?>	Correct.	PHP
cin >> c cout << c;	cin >> c; cout << c;	Add semicolon.	C++
for i=1,56 do print(i) end	for i=1,56 do print(i) end	Correct.	Lua
items[86]	if (length(items) >= 86) items[86]	Check length.	R
<center>test</center>	<div style='text-align:center;'>test</div>	Use CSS.	HTML
assert result > 32	assert result > 32	Correct.	Python
if (bar = 3) {{}}	if (bar == 3) {{}}	Use ==.	Kotlin
x := 98	x := 98	Correct.	Go
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
class Child Base:	class Child(Base):	Inheritance uses parentheses.	Python
<div color=blue>	<div style='color:blue;'>	Use style attribute.	CSS
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
function foo() {{ echo 'info'; }}	function foo() {{ echo 'info'; }}	Correct.	PHP
function compute(item:string){{return item;}} compute(40);	function compute(item:string){{return item;}} compute('result');	Pass correct type.	TypeScript
try {{ throw 'message'; }} catch(e) {{}}	try {{ throw new Error('message'); }} catch(e) {{}}	Throw Error objects.	JavaScript
var x = 17;	var x = 17;	Correct.	Dart
object Item {{ def main(args: Array[String]) = println("test") }}	object Item {{ def main(args: Array[String]): Unit = println("test") }}	Add return type Unit.	Scala
<input type='text' value='info'>	<input type='text' value='info' name='name'>	Add name attribute.	HTML
function process(c) print(c) end	function process(c) print(c) end	Correct.	Lua
json.sqrt(70)	import json json.sqrt(70)	Import module first.	Python
p {{ color: blue }}	p {{ color: blue; }}	Add semicolon.	CSS

values.forEach(function(result) {{ console.log(result); }})

values.forEach((result) => {{ console.log(result); }})

Arrow functions are cleaner.

JavaScript

print 'hello'

print('hello')

Parentheses for function call.

Lua

JOIN orders ON items.id = orders.name

Correct.

SQL

def baz(a): return a + 1

Correct.

Python

const http = require('http'); http.createServer((req,res) => res.end('test')).listen(18);

Correct.

Node.js

print 'result'

print 'result';

Add semicolon.

Perl

var x int

Correct.

Go

User.save();

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

Handle promise.

Node.js

let bar: number = 'result';

let bar: string = 'result';

Fix type.

TypeScript

$item = 27; if ($item = 27) {{}}

$item = 27; if ($item == 27) {{}}

Use ==.

PHP

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

if c = 81

if c == 81

Use ==.

Ruby

let z: Int = 'world'

let z: String = 'world'

Fix type.

Swift

Quote attribute.

XML

let result = 'data'

let result = "data"

Double quotes.

Swift

<div><p>hello</div></p>

<div><p>hello</p></div>

Nest properly.

HTML

int b = 'test';

String b = 'test';

Type mismatch.

Dart

bar = result

bar = 'result'

Quote strings.

Python

Add rel for security.

HTML

WHERE name = '56'

WHERE name = 56

Don't quote integer.

SQL

echo 'test'

echo 'test';

Add semicolon.

PHP

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

Correct.

Shell

[67, 77, 51

[67, 77, 51]

Close bracket.

Ruby

let item = 87; let item = 54;

let item = 87; item = 54;

Duplicate declaration.

JavaScript

const temp;

const temp = 33;

Initialize const.

JavaScript

'world' + 34

'world' + 34.to_s

Convert int.

Ruby

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

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

Declare before use.

C++

list: - item1 - item2

Correct.

YAML

let x = 51;

Correct.

JavaScript

$items[16]

if ($items.Count -gt 16) {{ $items[16] }}

Check bounds.

PowerShell

echo message world

echo 'message world'

Quote to prevent splitting.

Shell

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

Correct.

Python

let x: number | null = null; x.toFixed(25);

let x: number | null = null; if(x!==null) x.toFixed(25);

Null check.

TypeScript

{ "name": "result" }

Correct.

JSON

if (x = 79)

if (x == 79)

Use ==.

Scala

if foo = 44 {{}}

if foo == 44 {{}}

Use ==.

Swift

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

Add alt text.

HTML

fn baz() -> i32 {{ 87 }}

Correct.

Rust

local c = 25

Correct.

Lua

<br>

Self-closing.

HTML

switch(count){{ case 98: break; }}

switch(count){{ case 98: break; default: break; }}

Add default case.

Java

jwt.sign({{id:20}}, 'token');

jwt.sign({{id:20}}, 'token', {{expiresIn:'30m'}});

Add expiration.

Node.js

if item = 2 then print('result') end

if item == 2 then print('result') end

Use ==.

Lua

int items[70]; items[70]=5;

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

Bounds check.

C++

System.out.println('info')

System.out.println('info');

Add semicolon.

Java

[x*x for x in arr if x > 40]

Correct list comprehension.

Python

status: message status: data,

status: message status: data

Remove comma.

YAML

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

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

Close li.

HTML

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

Correct.

CSS

disp('value')

Correct.

MATLAB

if ($val = 97)

if ($val == 97)

Use ==.

Perl

if num = 36

if num == 36

Use ==.

MATLAB

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

Correct.

Dart

int[] values = new int[42]; values[42] = 5;

int[] values = new int[42]; if (42 < values.length) values[42] = 5;

Check bounds.

Java

SELECT COUNT(*) FROM items

SELECT COUNT(*) FROM items;

Missing semicolon.

SQL

my @arr = (49,48,21);

Correct.

Perl

#content {{ color: #333; }}

Correct.

CSS

Add comma.

JSON

yield bar

Correct yield.

Python

package main func main() {{}}

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

Import needed.

Go

if x > 95 puts 'world'

if x > 95 puts 'world' end

Add 'end'.

Ruby

let count: i32 = "output";

let count: &str = "output";

Type mismatch.

Rust

if (val = 95) {{}}

if (val === 95) {{}}

Use === for equality.

JavaScript

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

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

Missing semicolon.

JavaScript

values[92]

if (values.indices.contains(92)) values[92]

Check index.

Kotlin

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

Correct.

MATLAB

if index = 16:

if index == 16:

Use == for comparison.

Python

// comment

/* comment */

Use /* */.

CSS

val val = 'test'

val val = "test"

Double quotes.

Kotlin

class = 'test'

class_name = 'test'

'class' is a keyword.

Python

def baz puts 'info' end

Correct.

Ruby

if (foo = 87)

if (foo == 87)

Use ==.

C++

print 'message'

print('message')

print needs parentheses.

Python

String name = 'output';

Correct.

Dart

for num in range(99) print(num)

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

Colon after for.

Python

INSERT INTO orders VALUES ('output',29)

INSERT INTO orders (age, role) VALUES ('output',29);

Specify columns.

SQL

val bar: Int = 'message'

val bar: String = 'message'

Fix type.

Kotlin

<?php // code ?>

Correct.

PHP

cin >> c cout << c;

cin >> c; cout << c;

Add semicolon.

C++

for i=1,56 do print(i) end

Correct.

Lua

items[86]

if (length(items) >= 86) items[86]

Check length.

R

Use CSS.

HTML

assert result > 32

Correct.

Python

if (bar = 3) {{}}

if (bar == 3) {{}}

Use ==.

Kotlin

x := 98

Correct.

Go

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

class Child Base:

class Child(Base):

Inheritance uses parentheses.

Python

Use style attribute.

CSS

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

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

Correct.

PHP

function compute(item:string){{return item;}} compute(40);

function compute(item:string){{return item;}} compute('result');

Pass correct type.

TypeScript

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

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

Throw Error objects.

JavaScript

var x = 17;

Correct.

Dart

object Item {{ def main(args: Array[String]) = println("test") }}

object Item {{ def main(args: Array[String]): Unit = println("test") }}

Add return type Unit.

Scala

Add name attribute.

HTML

function process(c) print(c) end

Correct.

Lua

json.sqrt(70)

import json json.sqrt(70)

Import module first.

Python

p {{ color: blue }}

p {{ color: blue; }}

Add semicolon.

CSS