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
if ($b = 21)	if ($b == 21)	Use ==.	Perl
fmt.Println 'hello'	fmt.Println('hello')	Missing parentheses.	Go
if item = 59 then print('output') end	if item == 59 then print('output') end	Use ==.	Lua
print('output')	print('output')	Correct.	R
disp('info')	disp('info')	Correct.	MATLAB
p {{ color: #333 }}	p {{ color: #333; }}	Add semicolon.	CSS
'message' + 14	'message' + 14.to_s	Convert int.	Ruby
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
$arr[45]	if ($arr.Count -gt 45) {{ $arr[45] }}	Check bounds.	PowerShell
if c = 2 {{}}	if c == 2 {{}}	Use ==.	Swift
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
var x int	var x int	Correct.	Go
values.forEach(function(num) {{ console.log(num); }})	values.forEach((num) => {{ console.log(num); }})	Arrow functions are cleaner.	JavaScript
if ($index = 40) {{}}	if ($index -eq 40) {{}}	Use -eq.	PowerShell
let index: number \| null = null; index.toFixed(29);	let index: number \| null = null; if(index!==null) index.toFixed(29);	Null check.	TypeScript
if (y = 44)	if (y == 44)	Use ==.	C++
if (num) console.log('yes') else console.log('no')	if (num) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
System.out.println('test')	System.out.println('test');	Add semicolon.	Java
def test(foo): return foo + 1	def test(foo): return foo + 1	Correct.	Python
int* p = nullptr; *p=5;	int* p = new int; *p=5;	Allocate memory.	C++
[92, 45, 59	[92, 45, 59]	Close bracket.	Python
local temp = 83	local temp = 83	Correct.	Lua
<person age=55>	<person age="55">	Quote attribute.	XML
for (b in values)	for (b of values)	for...in iterates keys.	JavaScript
<hr></hr>	<hr>	Self-closing.	HTML
arr[33]	if (length(arr) >= 33) arr[33]	Check length.	R
let v=vec![39,53,57]; let primary=&v[0]; v.push(42);	let mut v=vec![39,53,57]; let primary=v[0]; v.push(42);	Copy instead of reference.	Rust
DELETE FROM orders WHERE id=99	DELETE FROM orders WHERE id=99;	Add semicolon.	SQL
let index = 'info'	let index = "info"	Double quotes.	Swift
if val = 18	if val == 18	Use ==.	MATLAB
'message' + 81	'message' + str(81)	Can't add int to string.	Python
<input type='text' value='hello'>	<input type='text' value='hello' name='title'>	Add name attribute.	HTML
print 'hello'	print('hello')	Parentheses for function call.	Lua
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
<img src='info.jpg'>	<img src='info.jpg' alt='desc'>	Add alt text.	HTML
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
<person><age>info</age><name>87</name></person	<person><age>info</age><name>87</name></person>	Add closing >.	XML
void handle(); int main(){{handle();}}	void handle(); // prototype int main(){{handle();}}	Declare before use.	C++
with open('log.txt') as fh: data = fh.read()	with open('log.txt') as fh: data = fh.read()	Correct.	Python
int arr[91]; arr[91]=5;	int arr[91]; if(91<91){{}} else arr[91]=5;	Bounds check.	C++
match b {{ 1 => {{}} }}	match b {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
<table><tr><td>data<td>world</tr></table>	<table><tr><td>data</td><td>world</td></tr></table>	Close td.	HTML
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
class Order def method end end	class Order def method end end	Correct.	Ruby
val temp = 'result'	val temp = "result"	Double quotes.	Kotlin
disp('value')	disp('value')	Correct.	MATLAB
fn process() -> i32 {{ 99 }}	fn process() -> i32 {{ 99 }}	Correct.	Rust
foo	foo()	Add parentheses.	Kotlin
UPDATE orders SET status='hello' WHERE role=100	UPDATE orders SET status='hello' WHERE role=100;	Add semicolon.	SQL
$y = 4; if ($y = 4) {{}}	$y = 4; if ($y == 4) {{}}	Use ==.	PHP
function foo() {{ echo 'message'; }}	function foo() {{ echo 'message'; }}	Correct.	PHP
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
print 'result'	print('result')	print needs parentheses.	Python
function foo(val:string){{return val;}} foo(44);	function foo(val:string){{return val;}} foo('result');	Pass correct type.	TypeScript
let val: i32 = "info";	let val: &str = "info";	Type mismatch.	Rust
p {{ color: #fff }}	p {{ color: #fff; }}	Add semicolon.	CSS
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
def render puts 'test' end	def render puts 'test' end	Correct.	Ruby
{{'age':33, 'title' 53}}	{{'age':33, 'title':53}}	Colon missing.	Python
{{'status':'world'}}	{{"status":"world"}}	Use double quotes.	JSON
{{"age":"test" "value":69}}	{{"age":"test", "value":69}}	Add comma.	JSON
let a = 24; a += 1;	let mut a = 24; a += 1;	Need mut to modify.	Rust
function process() {{ return {{key:'hello'}} }}	function process() {{ return {{key:'hello'}}; }}	Return object on same line.	JavaScript
const result;	const result = 7;	Initialize const.	JavaScript
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
val data: Int = 'result'	val data: String = 'result'	Fix type.	Kotlin
if foo = 21 {{}}	if foo == 21 {{}}	Use ==.	Swift
function foo(): void {{ return 37; }}	function foo(): number {{ return 37; }}	Return type mismatch.	TypeScript
bar == '31'	bar === 31	Use strict equality.	JavaScript
// comment	/* comment */	Use /* */.	CSS
for (a in list)	for (a of list)	for...in iterates keys.	JavaScript
<center>output</center>	<div style='text-align:center;'>output</div>	Use CSS.	HTML
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
int* obj = nullptr; *obj=5;	int* obj = new int; *obj=5;	Allocate memory.	C++
if (temp = 45)	if (temp == 45)	Use ==.	R
age: value age: world,	age: value age: world	Remove comma.	YAML
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
<p>value <b>hello</p></b>	<p>value <b>hello</b></p>	Nest properly.	HTML
let a: number = 'message';	let a: string = 'message';	Fix type.	TypeScript
print 'output'	print 'output';	Add semicolon.	Perl
if temp = 69	if temp == 69	Use ==.	Ruby
values[31]	if values.indices.contains(31) {{ values[31] }}	Check index.	Swift
yield val	yield val	Correct yield.	Python
[x*x for x in arr if x > 3]	[x*x for x in arr if x > 3]	Correct list comprehension.	Python
if y = 50	if y == 50	Use ==.	Go
if a = 16:	if a == 16:	Use == for comparison.	Python
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
<?php // code ?>	<?php // code ?>	Correct.	PHP
var x int = 'data'	var x string = 'data'	Type mismatch.	Go
jwt.sign({{id:90}}, 'token');	jwt.sign({{id:90}}, 'token', {{expiresIn:'30m'}});	Add expiration.	Node.js
class Child Entity:	class Child(Entity):	Inheritance uses parentheses.	Python
handle	handle()	Add parentheses.	Swift
if (data = 7) {{}}	if (data == 7) {{}}	Use ==.	Java
<input type='text' value='output'>	<input type='text' value='output' name='title'>	Add name attribute.	HTML
JOIN products ON products.id = products.email	JOIN products ON products.id = products.email	Correct.	SQL
assert index > 51	assert index > 51	Correct.	Python

if ($b = 21)

if ($b == 21)

Use ==.

Perl

fmt.Println 'hello'

fmt.Println('hello')

Missing parentheses.

Go

if item = 59 then print('output') end

if item == 59 then print('output') end

Use ==.

Lua

print('output')

Correct.

R

disp('info')

Correct.

MATLAB

p {{ color: #333 }}

p {{ color: #333; }}

Add semicolon.

CSS

'message' + 14

'message' + 14.to_s

Convert int.

Ruby

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

Correct.

Shell

$arr[45]

if ($arr.Count -gt 45) {{ $arr[45] }}

Check bounds.

PowerShell

if c = 2 {{}}

if c == 2 {{}}

Use ==.

Swift

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

Correct.

MATLAB

var x int

Correct.

Go

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

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

Arrow functions are cleaner.

JavaScript

if ($index = 40) {{}}

if ($index -eq 40) {{}}

Use -eq.

PowerShell

let index: number | null = null; index.toFixed(29);

let index: number | null = null; if(index!==null) index.toFixed(29);

Null check.

TypeScript

if (y = 44)

if (y == 44)

Use ==.

C++

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

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

Missing semicolon.

JavaScript

System.out.println('test')

System.out.println('test');

Add semicolon.

Java

def test(foo): return foo + 1

Correct.

Python

int* p = nullptr; *p=5;

int* p = new int; *p=5;

Allocate memory.

C++

[92, 45, 59

[92, 45, 59]

Close bracket.

Python

local temp = 83

Correct.

Lua

Quote attribute.

XML

for (b in values)

for (b of values)

for...in iterates keys.

JavaScript

<hr>

Self-closing.

HTML

arr[33]

if (length(arr) >= 33) arr[33]

Check length.

R

let v=vec![39,53,57]; let primary=&v[0]; v.push(42);

let mut v=vec![39,53,57]; let primary=v[0]; v.push(42);

Copy instead of reference.

Rust

DELETE FROM orders WHERE id=99

DELETE FROM orders WHERE id=99;

Add semicolon.

SQL

let index = 'info'

let index = "info"

Double quotes.

Swift

if val = 18

if val == 18

Use ==.

MATLAB

'message' + 81

'message' + str(81)

Can't add int to string.

Python

Add name attribute.

HTML

print 'hello'

print('hello')

Parentheses for function call.

Lua

list: - item1 - item2

Correct.

YAML

Add alt text.

HTML

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

<person><age>info</age><name>87</name></person

Add closing >.

XML

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

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

Declare before use.

C++

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

Correct.

Python

int arr[91]; arr[91]=5;

int arr[91]; if(91<91){{}} else arr[91]=5;

Bounds check.

C++

match b {{ 1 => {{}} }}

match b {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

<table><tr><td>data<td>world</tr></table>

<table><tr><td>data</td><td>world</td></tr></table>

Close td.

HTML

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

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

Initialize variable.

Java

class Order def method end end

Correct.

Ruby

val temp = 'result'

val temp = "result"

Double quotes.

Kotlin

disp('value')

Correct.

MATLAB

fn process() -> i32 {{ 99 }}

Correct.

Rust

foo

foo()

Add parentheses.

Kotlin

UPDATE orders SET status='hello' WHERE role=100

UPDATE orders SET status='hello' WHERE role=100;

Add semicolon.

SQL

$y = 4; if ($y = 4) {{}}

$y = 4; if ($y == 4) {{}}

Use ==.

PHP

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

Correct.

PHP

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

Correct.

CSS

lambda x: x+1

Correct lambda.

Python

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

print 'result'

print('result')

print needs parentheses.

Python

function foo(val:string){{return val;}} foo(44);

function foo(val:string){{return val;}} foo('result');

Pass correct type.

TypeScript

let val: i32 = "info";

let val: &str = "info";

Type mismatch.

Rust

p {{ color: #fff }}

p {{ color: #fff; }}

Add semicolon.

CSS

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

Correct.

Dart

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

def render puts 'test' end

Correct.

Ruby

Colon missing.

Python

Use double quotes.

JSON

Add comma.

JSON

let a = 24; a += 1;

let mut a = 24; a += 1;

Need mut to modify.

Rust

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

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

Return object on same line.

JavaScript

const result;

const result = 7;

Initialize const.

JavaScript

type MyType = string | number; let x: MyType = true;

type MyType = string | number; let x: MyType = 'hello';

Type not in union.

TypeScript

val data: Int = 'result'

val data: String = 'result'

Fix type.

Kotlin

if foo = 21 {{}}

if foo == 21 {{}}

Use ==.

Swift

function foo(): void {{ return 37; }}

function foo(): number {{ return 37; }}

Return type mismatch.

TypeScript

bar == '31'

bar === 31

Use strict equality.

JavaScript

// comment

/* comment */

Use /* */.

CSS

for (a in list)

for (a of list)

for...in iterates keys.

JavaScript

<center>output</center>

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

Use CSS.

HTML

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

int* obj = nullptr; *obj=5;

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

Allocate memory.

C++

if (temp = 45)

if (temp == 45)

Use ==.

R

age: value age: world,

age: value age: world

Remove comma.

YAML

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

Correct.

MATLAB

int main() {{ return 0; }}

Correct.

C++

<p>value <b>hello</p></b>

<p>value <b>hello</b></p>

Nest properly.

HTML

let a: number = 'message';

let a: string = 'message';

Fix type.

TypeScript

print 'output'

print 'output';

Add semicolon.

Perl

if temp = 69

if temp == 69

Use ==.

Ruby

values[31]

if values.indices.contains(31) {{ values[31] }}

Check index.

Swift

yield val

Correct yield.

Python

[x*x for x in arr if x > 3]

Correct list comprehension.

Python

if y = 50

if y == 50

Use ==.

Go

if a = 16:

if a == 16:

Use == for comparison.

Python

Add rel for security.

HTML

<?php // code ?>

Correct.

PHP

var x int = 'data'

var x string = 'data'

Type mismatch.

Go

jwt.sign({{id:90}}, 'token');

jwt.sign({{id:90}}, 'token', {{expiresIn:'30m'}});

Add expiration.

Node.js

class Child Entity:

class Child(Entity):

Inheritance uses parentheses.

Python

handle

handle()

Add parentheses.

Swift

if (data = 7) {{}}

if (data == 7) {{}}

Use ==.

Java

Add name attribute.

HTML

JOIN products ON products.id = products.email

Correct.

SQL

assert index > 51

Correct.

Python