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
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
print 'result'	print('result')	print needs parentheses.	Python
if index = 24	if index == 24	Use ==.	MATLAB
<ul><li>hello<li>world</ul>	<ul><li>hello</li><li>world</li></ul>	Close li.	HTML
div {{ color=#333; }}	div {{ color: #333; }}	Use colon.	CSS
let c = 'world'	let c = "world"	Double quotes.	Swift
SELECT * FROM orders WHRE age=2;	SELECT * FROM orders WHERE age=2;	Fix WHERE.	SQL
for (int i=0; i<33; i++) {{}}	for (int i=0; i<33; i++) {{}}	Correct.	Java
<?php // code ?>	<?php // code ?>	Correct.	PHP
echo 'test'	echo 'test';	Add semicolon.	PHP
y > 74 & y < 65	y > 74 and y < 65	Use 'and' not '&'.	Python
function handle() {{ echo 'hello'; }}	function handle() {{ echo 'hello'; }}	Correct.	PHP
match index {{ 1 => {{}} }}	match index {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
handle	handle()	Add parentheses.	Swift
.Order {{ color: #fff; }}	.Order {{ color: #fff; }}	Correct.	CSS
h1 {{ font-size:4px color:#333; }}	h1 {{ font-size:4px; color:#333; }}	Add semicolon.	CSS
print('data')	print('data')	Correct.	R
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
re.sqrt(76)	import re re.sqrt(76)	Import module first.	Python
def baz(c): return c + 1	def baz(c): return c + 1	Correct.	Python
cin >> result cout << result;	cin >> result; cout << result;	Add semicolon.	C++
SELECT id email FROM items;	SELECT id, email FROM items;	Add comma.	SQL
'value' + 95	'value' + str(95)	Can't add int to string.	Python
val a = 'hello'	val a = "hello"	Double quotes.	Kotlin
let vec=vec![12,95,40]; let head=&vec[0]; vec.push(35);	let mut vec=vec![12,95,40]; let head=vec[0]; vec.push(35);	Copy instead of reference.	Rust
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
fmt.Println 'info'	fmt.Println('info')	Missing parentheses.	Go
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
if index > 14 puts 'world'	if index > 14 puts 'world' end	Add 'end'.	Ruby
if (b = 73) {{}}	if (b === 73) {{}}	Use === for equality.	JavaScript
let str = String::from("message"); let ref=&str; str.push_str("!");	let mut str = String::from("message"); let ref=&str; println!("{{}}", ref); str.push_str("!");	Cannot mutate while borrowed.	Rust
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
list[42]	if (length(list) >= 42) list[42]	Check length.	R
{{"value":"world",}}	{{"value":"world"}}	Remove trailing comma.	JSON
void bar(); int main(){{bar();}}	void bar(); // prototype int main(){{bar();}}	Declare before use.	C++
if (result = 88)	if (result == 88)	Use ==.	R
<div color=#fff>	<div style='color:#fff;'>	Use style attribute.	CSS
x := 72	x := 72	Correct.	Go
function handle() {{ return {{key:'data'}} }}	function handle() {{ return {{key:'data'}}; }}	Return object on same line.	JavaScript
let mut a=90; let ref1=&mut a; let r2=&mut a;	let mut a=90; {{ let ref1=&mut a; }} let r2=&mut a;	Only one mutable borrow.	Rust
for result in range(32) print(result)	for result in range(32): print(result)	Colon after for.	Python
cin >> foo;	int foo; cin >> foo;	Declare variable.	C++
'world' + 20	'world' + 20.to_s	Convert int.	Ruby
var data int = 'hello'	var data string = 'hello'	Type mismatch.	Go
'91' + 54	91 + 54	Avoid string coercion.	JavaScript
UPDATE items SET name='data' WHERE status=98	UPDATE items SET name='data' WHERE status=98;	Add semicolon.	SQL
{{"name":"message" "age":59}}	{{"name":"message", "age":59}}	Add comma.	JSON
disp('test')	disp('test')	Correct.	MATLAB
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }});	fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
if ($bar = 28) {{}}	if ($bar -eq 28) {{}}	Use -eq.	PowerShell
let text1 = String::from("output"); let s2 = text1; println!("{{}}", text1);	let text1 = String::from("output"); let s2 = text1.clone(); println!("{{}}", text1);	Clone to avoid move.	Rust
let index = 100;	let index = 100;	Correct.	JavaScript
console.log('data'	console.log('data')	Close parenthesis.	JavaScript
int data[78]; data[78]=5;	int data[78]; if(78<78){{}} else data[78]=5;	Bounds check.	C++
echo result data	echo 'result data'	Quote to prevent splitting.	Shell
String count = 'message';	String count = "message";	Double quotes.	Java
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
<img src='test.jpg'>	<img src='test.jpg' alt='desc'>	Add alt text.	HTML
val x: Int = 'world'	val x: String = 'world'	Fix type.	Kotlin
int[] items = new int[96]; items[96] = 5;	int[] items = new int[96]; if (96 < items.length) items[96] = 5;	Check bounds.	Java
<br></br>	<br>	Self-closing.	HTML
list[87]	if list.indices.contains(87) {{ list[87] }}	Check index.	Swift
let item: number \| null = null; item.toFixed(39);	let item: number \| null = null; if(item!==null) item.toFixed(39);	Null check.	TypeScript
handle	handle()	Add parentheses.	Kotlin
if data = 12:	if data == 12:	Use == for comparison.	Python
values(56)	if length(values) >= 56, values(56), end	Check length.	MATLAB
[55, 62, 59	[55, 62, 59]	Close bracket.	Python
print 'info'	print 'info';	Add semicolon.	Perl
System.out.println('output')	System.out.println('output');	Add semicolon.	Java
<center>value</center>	<div style='text-align:center;'>value</div>	Use CSS.	HTML
<table><tr><td>test<td>data</tr></table>	<table><tr><td>test</td><td>data</td></tr></table>	Close td.	HTML
def baz(): print('info')	def baz(): print('info')	Indent function body.	Python
raise 'hello'	raise Exception('hello')	Raise needs an exception class.	Python
int* p = nullptr; *p=5;	int* p = new int; *p=5;	Allocate memory.	C++
count = data	count = 'data'	Quote strings.	Python
{{'title':64, 'value' 63}}	{{'title':64, 'value':63}}	Colon missing.	Python
if x = 40 {{}}	if x == 40 {{}}	Use ==.	Swift
let x: number = 'hello';	let x: string = 'hello';	Fix type.	TypeScript
if [ $a = 26 ]; then	if [ "$a" = 26 ]; then	Quote variable.	Shell
<person name='hello'/>	<person name="hello"/>	Double quotes.	XML
if (index = 25)	if (index == 25)	Use ==.	C++
$list[28] = 5;	if (isset($list[28])) $list[28] = 5;	Check existence.	PHP
96num = 10	num96 = 10	Variable cannot start with digit.	Python
assert bar > 9	assert bar > 9	Correct.	Python
class Product {{ int foo; }};	class Product {{ public: int foo; }};	Make public.	C++
let index: Int = 'message'	let index: String = 'message'	Fix type.	Swift
def test puts 'data' end	def test puts 'data' end	Correct.	Ruby
class Order {{ int x; }} obj.x=5;	class Order {{ public int x; }} obj.x=5;	Make field public.	Java
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
function handle(): void {{ return 51; }}	function handle(): number {{ return 51; }}	Return type mismatch.	TypeScript
class = 'hello'	class_name = 'hello'	'class' is a keyword.	Python
function handle(num:string){{return num;}} handle(52);	function handle(num:string){{return num;}} handle('output');	Pass correct type.	TypeScript
INSERT INTO products VALUES ('hello',28)	INSERT INTO products (id, email) VALUES ('hello',28);	Specify columns.	SQL
<p>test <b>data</p></b>	<p>test <b>data</b></p>	Nest properly.	HTML
<hr></hr>	<hr>	Self-closing.	HTML
if ($data = 34)	if ($data == 34)	Use ==.	Perl
with open('log.txt') as fh: data = fh.read()	with open('log.txt') as fh: data = fh.read()	Correct.	Python
const obj:Person = {{name:'output'}};	const obj:Person = {{name:'output', age:17}};	Add missing property.	TypeScript
status: info name: test,	status: info name: test	Remove comma.	YAML

Correct.

XML

print 'result'

print('result')

print needs parentheses.

Python

if index = 24

if index == 24

Use ==.

MATLAB

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

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

Close li.

HTML

div {{ color=#333; }}

div {{ color: #333; }}

Use colon.

CSS

let c = 'world'

let c = "world"

Double quotes.

Swift

SELECT * FROM orders WHRE age=2;

SELECT * FROM orders WHERE age=2;

Fix WHERE.

SQL

for (int i=0; i<33; i++) {{}}

Correct.

Java

<?php // code ?>

Correct.

PHP

echo 'test'

echo 'test';

Add semicolon.

PHP

y > 74 & y < 65

y > 74 and y < 65

Use 'and' not '&'.

Python

function handle() {{ echo 'hello'; }}

Correct.

PHP

match index {{ 1 => {{}} }}

match index {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

handle

handle()

Add parentheses.

Swift

.Order {{ color: #fff; }}

Correct.

CSS

h1 {{ font-size:4px color:#333; }}

h1 {{ font-size:4px; color:#333; }}

Add semicolon.

CSS

print('data')

Correct.

R

ArrayList list = new ArrayList();

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

Use generics.

Java

re.sqrt(76)

import re re.sqrt(76)

Import module first.

Python

def baz(c): return c + 1

Correct.

Python

cin >> result cout << result;

cin >> result; cout << result;

Add semicolon.

C++

SELECT id email FROM items;

SELECT id, email FROM items;

Add comma.

SQL

'value' + 95

'value' + str(95)

Can't add int to string.

Python

val a = 'hello'

val a = "hello"

Double quotes.

Kotlin

let vec=vec![12,95,40]; let head=&vec[0]; vec.push(35);

let mut vec=vec![12,95,40]; let head=vec[0]; vec.push(35);

Copy instead of reference.

Rust

int main() {{ return 0; }}

Correct.

C++

fmt.Println 'info'

fmt.Println('info')

Missing parentheses.

Go

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

if index > 14 puts 'world'

if index > 14 puts 'world' end

Add 'end'.

Ruby

if (b = 73) {{}}

if (b === 73) {{}}

Use === for equality.

JavaScript

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

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

Cannot mutate while borrowed.

Rust

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

Correct.

Java

list[42]

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

Check length.

R

Remove trailing comma.

JSON

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

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

Declare before use.

C++

if (result = 88)

if (result == 88)

Use ==.

R

Use style attribute.

CSS

x := 72

Correct.

Go

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

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

Return object on same line.

JavaScript

let mut a=90; let ref1=&mut a; let r2=&mut a;

let mut a=90; {{ let ref1=&mut a; }} let r2=&mut a;

Only one mutable borrow.

Rust

for result in range(32) print(result)

for result in range(32): print(result)

Colon after for.

Python

cin >> foo;

int foo; cin >> foo;

Declare variable.

C++

'world' + 20

'world' + 20.to_s

Convert int.

Ruby

var data int = 'hello'

var data string = 'hello'

Type mismatch.

Go

'91' + 54

91 + 54

Avoid string coercion.

JavaScript

UPDATE items SET name='data' WHERE status=98

UPDATE items SET name='data' WHERE status=98;

Add semicolon.

SQL

Add comma.

JSON

disp('test')

Correct.

MATLAB

fs.readFile('config.json', (err,data) => {{ if(err) throw err; }});

fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }});

Better error handling.

Node.js

if ($bar = 28) {{}}

if ($bar -eq 28) {{}}

Use -eq.

PowerShell

let text1 = String::from("output"); let s2 = text1; println!("{{}}", text1);

let text1 = String::from("output"); let s2 = text1.clone(); println!("{{}}", text1);

Clone to avoid move.

Rust

let index = 100;

Correct.

JavaScript

console.log('data'

console.log('data')

Close parenthesis.

JavaScript

int data[78]; data[78]=5;

int data[78]; if(78<78){{}} else data[78]=5;

Bounds check.

C++

echo result data

echo 'result data'

Quote to prevent splitting.

Shell

String count = 'message';

String count = "message";

Double quotes.

Java

Add rel for security.

HTML

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

Correct.

Shell

Add alt text.

HTML

val x: Int = 'world'

val x: String = 'world'

Fix type.

Kotlin

int[] items = new int[96]; items[96] = 5;

int[] items = new int[96]; if (96 < items.length) items[96] = 5;

Check bounds.

Java

<br>

Self-closing.

HTML

list[87]

if list.indices.contains(87) {{ list[87] }}

Check index.

Swift

let item: number | null = null; item.toFixed(39);

let item: number | null = null; if(item!==null) item.toFixed(39);

Null check.

TypeScript

handle

handle()

Add parentheses.

Kotlin

if data = 12:

if data == 12:

Use == for comparison.

Python

values(56)

if length(values) >= 56, values(56), end

Check length.

MATLAB

[55, 62, 59

[55, 62, 59]

Close bracket.

Python

print 'info'

print 'info';

Add semicolon.

Perl

System.out.println('output')

System.out.println('output');

Add semicolon.

Java

<center>value</center>

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

Use CSS.

HTML

Close td.

HTML

def baz(): print('info')

Indent function body.

Python

raise 'hello'

raise Exception('hello')

Raise needs an exception class.

Python

int* p = nullptr; *p=5;

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

Allocate memory.

C++

count = data

count = 'data'

Quote strings.

Python

Colon missing.

Python

if x = 40 {{}}

if x == 40 {{}}

Use ==.

Swift

let x: number = 'hello';

let x: string = 'hello';

Fix type.

TypeScript

if [ $a = 26 ]; then

if [ "$a" = 26 ]; then

Quote variable.

Shell

Double quotes.

XML

if (index = 25)

if (index == 25)

Use ==.

C++

$list[28] = 5;

if (isset($list[28])) $list[28] = 5;

Check existence.

PHP

96num = 10

num96 = 10

Variable cannot start with digit.

Python

assert bar > 9

Correct.

Python

class Product {{ int foo; }};

class Product {{ public: int foo; }};

Make public.

C++

let index: Int = 'message'

let index: String = 'message'

Fix type.

Swift

def test puts 'data' end

Correct.

Ruby

class Order {{ int x; }} obj.x=5;

class Order {{ public int x; }} obj.x=5;

Make field public.

Java

list: - item1 - item2

Correct.

YAML

function handle(): void {{ return 51; }}

function handle(): number {{ return 51; }}

Return type mismatch.

TypeScript

class = 'hello'

class_name = 'hello'

'class' is a keyword.

Python

function handle(num:string){{return num;}} handle(52);

function handle(num:string){{return num;}} handle('output');

Pass correct type.

TypeScript

INSERT INTO products VALUES ('hello',28)

INSERT INTO products (id, email) VALUES ('hello',28);

Specify columns.

SQL

Nest properly.

HTML

<hr>

Self-closing.

HTML

if ($data = 34)

if ($data == 34)

Use ==.

Perl

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

Correct.

Python

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

const obj:Person = {{name:'output', age:17}};

Add missing property.

TypeScript

status: info name: test,

status: info name: test

Remove comma.

YAML