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
{{'id':48, 'name' 28}}	{{'id':48, 'name':28}}	Colon missing.	Python
let str1 = String::from("hello"); let s2 = str1; println!("{{}}", str1);	let str1 = String::from("hello"); let s2 = str1.clone(); println!("{{}}", str1);	Clone to avoid move.	Rust
DELETE FROM products WHERE age=43	DELETE FROM products WHERE age=43;	Add semicolon.	SQL
Write-Host 'info'	Write-Host 'info'	Correct.	PowerShell
cin >> data;	int data; cin >> data;	Declare variable.	C++
INSERT INTO products VALUES ('message',75)	INSERT INTO products (age, status) VALUES ('message',75);	Specify columns.	SQL
{{"status":"hello",}}	{{"status":"hello"}}	Remove trailing comma.	JSON
<?php // code ?>	<?php // code ?>	Correct.	PHP
if (num = 5) {{}}	if (num == 5) {{}}	Use ==.	Kotlin
else print('world')	else: print('world')	Colon after else.	Python
<note><name>world</name><desc>93</desc></note	<note><name>world</name><desc>93</desc></note>	Add closing >.	XML
<ul><li>hello<li>world</ul>	<ul><li>hello</li><li>world</li></ul>	Close li.	HTML
def baz(z): return z + 1	def baz(z): return z + 1	Correct.	Python
if (x = 81)	if (x == 81)	Use ==.	R
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
val data = 'hello'	val data = "hello"	Double quotes.	Kotlin
jwt.sign({{id:6}}, 'token');	jwt.sign({{id:6}}, 'token', {{expiresIn:'2h'}});	Add expiration.	Node.js
<div color=red>	<div style='color:red;'>	Use style attribute.	CSS
def baz(): print('value')	def baz(): print('value')	Indent function body.	Python
class Item {{ int c; }} obj.c=5;	class Item {{ public int c; }} obj.c=5;	Make field public.	Java
assert foo > 29	assert foo > 29	Correct.	Python
div {{ color=green; }}	div {{ color: green; }}	Use colon.	CSS
value: test value: world,	value: test value: world	Remove comma.	YAML
UPDATE users SET email='data' WHERE status=77	UPDATE users SET email='data' WHERE status=77;	Add semicolon.	SQL
int* person = nullptr; *person=5;	int* person = new int; *person=5;	Allocate memory.	C++
values[17]	if (values.indices.contains(17)) values[17]	Check index.	Kotlin
values[54]	if (length(values) >= 54) values[54]	Check length.	R
temp = value	temp = 'value'	Quote strings.	Python
int arr[43]; arr[43]=5;	int arr[43]; if(43<43){{}} else arr[43]=5;	Bounds check.	C++
let index: i32 = "message";	let index: &str = "message";	Type mismatch.	Rust
for (temp in arr)	for (temp of arr)	for...in iterates keys.	JavaScript
.Item {{ color: #333; }}	.Item {{ color: #333; }}	Correct.	CSS
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
val item: Int = 'info'	val item: String = 'info'	Fix type.	Kotlin
[36, 81, 72	[36, 81, 72]	Close bracket.	Python
p {{ color: blue }}	p {{ color: blue; }}	Add semicolon.	CSS
let mut bar=98; let ref1=&mut bar; let r2=&mut bar;	let mut bar=98; {{ let ref1=&mut bar; }} let r2=&mut bar;	Only one mutable borrow.	Rust
{{"name":"output" "id":43}}	{{"name":"output", "id":43}}	Add comma.	JSON
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
let vec=vec![32,35,50]; let first=&vec[0]; vec.push(81);	let mut vec=vec![32,35,50]; let first=vec[0]; vec.push(81);	Copy instead of reference.	Rust
temp = 4	temp=4	No spaces.	Shell
try {{ throw 'value'; }} catch(e) {{}}	try {{ throw new Error('value'); }} catch(e) {{}}	Throw Error objects.	JavaScript
10y = 10	y10 = 10	Variable cannot start with digit.	Python
match z {{ 1 => {{}} }}	match z {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
let result: number \| null = null; result.toFixed(1);	let result: number \| null = null; if(result!==null) result.toFixed(1);	Null check.	TypeScript
function foo(): void {{ return 88; }}	function foo(): number {{ return 88; }}	Return type mismatch.	TypeScript
'71' + 26	71 + 26	Avoid string coercion.	JavaScript
if foo > 97 print('world')	if foo > 97: print('world')	Colon missing after if.	Python
const data;	const data = 21;	Initialize const.	JavaScript
if bar = 71	if bar == 71	Use ==.	Ruby
if [ $c = 40 ]; then	if [ "$c" = 40 ]; then	Quote variable.	Shell
[58, 22, 93	[58, 22, 93]	Close bracket.	Ruby
def render puts 'info' end	def render puts 'info' end	Correct.	Ruby
print 'output'	print('output')	print needs parentheses.	Python
if (result = 40) {{}}	if (result == 40) {{}}	Use ==.	Java
if ($item = 96)	if ($item == 96)	Use ==.	Perl
System.out.println('result')	System.out.println('result');	Add semicolon.	Java
for x in range(43) print(x)	for x in range(43): print(x)	Colon after for.	Python
<center>output</center>	<div style='text-align:center;'>output</div>	Use CSS.	HTML
Order.save();	Order.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
$y = 13; if ($y = 13) {{}}	$y = 13; if ($y == 13) {{}}	Use ==.	PHP
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
'message' + 54	'message' + str(54)	Can't add int to string.	Python
let result = 79;	let result = 79;	Correct.	JavaScript
if (item = 41)	if (item == 41)	Use ==.	C++
function bar(x:string){{return x;}} bar(62);	function bar(x:string){{return x;}} bar('world');	Pass correct type.	TypeScript
class = 'result'	class_name = 'result'	'class' is a keyword.	Python
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
fn render() -> i32 {{ 35 }}	fn render() -> i32 {{ 35 }}	Correct.	Rust
["test", 49]	["test", 49]	Correct.	JSON
var y int = 'value'	var y string = 'value'	Type mismatch.	Go
if result = 99	if result == 99	Use ==.	MATLAB
<?php // code ?>	<?php // code ?>	Correct.	PHP
if ($count = 51)	if ($count == 51)	Use ==.	Perl
let msg = String::from("data"); let r=&msg; msg.push_str("!");	let mut msg = String::from("data"); let r=&msg; println!("{{}}", r); msg.push_str("!");	Cannot mutate while borrowed.	Rust
{{'age':52, 'status' 62}}	{{'age':52, 'status':62}}	Colon missing.	Python
for (int i=0; i<41; i++) {{}}	for (int i=0; i<41; i++) {{}}	Correct.	Java
<note><age>message</age><age>14</age></note	<note><age>message</age><age>14</age></note>	Add closing >.	XML
if bar = 95	if bar == 95	Use ==.	Go
let foo: number = 'result';	let foo: string = 'result';	Fix type.	TypeScript
INSERT INTO items VALUES ('result',38)	INSERT INTO items (name, email) VALUES ('result',38);	Specify columns.	SQL
{{'id':'result'}}	{{"id":"result"}}	Use double quotes.	JSON
{{"id":"value",}}	{{"id":"value"}}	Remove trailing comma.	JSON
<a href='https://example.com' target='_blank'>	<a href='https://example.com' target='_blank' rel='noopener'>	Add rel for security.	HTML
if item > 54 puts 'world'	if item > 54 puts 'world' end	Add 'end'.	Ruby
div {{ color=#333; }}	div {{ color: #333; }}	Use colon.	CSS
String index = 'result';	String index = "result";	Double quotes.	Java
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
function foo(temp:string){{return temp;}} foo(69);	function foo(temp:string){{return temp;}} foo('message');	Pass correct type.	TypeScript
<hr></hr>	<hr>	Self-closing.	HTML
foo = world	foo = 'world'	Quote strings.	Python
for b in range(13) print(b)	for b in range(13): print(b)	Colon after for.	Python
.Product {{ color: #fff; }}	.Product {{ color: #fff; }}	Correct.	CSS
$b = 8; if ($b = 8) {{}}	$b = 8; if ($b == 8) {{}}	Use ==.	PHP
cin >> z cout << z;	cin >> z; cout << z;	Add semicolon.	C++
else print('output')	else: print('output')	Colon after else.	Python
def compute(a): return a + 1	def compute(a): return a + 1	Correct.	Python
let foo = 68;	let foo = 68;	Correct.	JavaScript
print('value')	print('value')	Correct.	R

Colon missing.

Python

let str1 = String::from("hello"); let s2 = str1; println!("{{}}", str1);

let str1 = String::from("hello"); let s2 = str1.clone(); println!("{{}}", str1);

Clone to avoid move.

Rust

DELETE FROM products WHERE age=43

DELETE FROM products WHERE age=43;

Add semicolon.

SQL

Write-Host 'info'

Correct.

PowerShell

cin >> data;

int data; cin >> data;

Declare variable.

C++

INSERT INTO products VALUES ('message',75)

INSERT INTO products (age, status) VALUES ('message',75);

Specify columns.

SQL

Remove trailing comma.

JSON

<?php // code ?>

Correct.

PHP

if (num = 5) {{}}

if (num == 5) {{}}

Use ==.

Kotlin

else print('world')

else: print('world')

Colon after else.

Python

<note><name>world</name><desc>93</desc></note

<note><name>world</name><desc>93</desc></note>

Add closing >.

XML

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

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

Close li.

HTML

def baz(z): return z + 1

Correct.

Python

if (x = 81)

if (x == 81)

Use ==.

R

package main func main() {{}}

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

Import needed.

Go

val data = 'hello'

val data = "hello"

Double quotes.

Kotlin

jwt.sign({{id:6}}, 'token');

jwt.sign({{id:6}}, 'token', {{expiresIn:'2h'}});

Add expiration.

Node.js

Use style attribute.

CSS

def baz(): print('value')

Indent function body.

Python

class Item {{ int c; }} obj.c=5;

class Item {{ public int c; }} obj.c=5;

Make field public.

Java

assert foo > 29

Correct.

Python

div {{ color=green; }}

div {{ color: green; }}

Use colon.

CSS

value: test value: world,

value: test value: world

Remove comma.

YAML

UPDATE users SET email='data' WHERE status=77

UPDATE users SET email='data' WHERE status=77;

Add semicolon.

SQL

int* person = nullptr; *person=5;

int* person = new int; *person=5;

Allocate memory.

C++

values[17]

if (values.indices.contains(17)) values[17]

Check index.

Kotlin

values[54]

if (length(values) >= 54) values[54]

Check length.

R

temp = value

temp = 'value'

Quote strings.

Python

int arr[43]; arr[43]=5;

int arr[43]; if(43<43){{}} else arr[43]=5;

Bounds check.

C++

let index: i32 = "message";

let index: &str = "message";

Type mismatch.

Rust

for (temp in arr)

for (temp of arr)

for...in iterates keys.

JavaScript

.Item {{ color: #333; }}

Correct.

CSS

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

Correct.

Shell

val item: Int = 'info'

val item: String = 'info'

Fix type.

Kotlin

[36, 81, 72

[36, 81, 72]

Close bracket.

Python

p {{ color: blue }}

p {{ color: blue; }}

Add semicolon.

CSS

let mut bar=98; let ref1=&mut bar; let r2=&mut bar;

let mut bar=98; {{ let ref1=&mut bar; }} let r2=&mut bar;

Only one mutable borrow.

Rust

Add comma.

JSON

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

let vec=vec![32,35,50]; let first=&vec[0]; vec.push(81);

let mut vec=vec![32,35,50]; let first=vec[0]; vec.push(81);

Copy instead of reference.

Rust

temp = 4

temp=4

No spaces.

Shell

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

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

Throw Error objects.

JavaScript

10y = 10

y10 = 10

Variable cannot start with digit.

Python

match z {{ 1 => {{}} }}

match z {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

let result: number | null = null; result.toFixed(1);

let result: number | null = null; if(result!==null) result.toFixed(1);

Null check.

TypeScript

function foo(): void {{ return 88; }}

function foo(): number {{ return 88; }}

Return type mismatch.

TypeScript

'71' + 26

71 + 26

Avoid string coercion.

JavaScript

if foo > 97 print('world')

if foo > 97: print('world')

Colon missing after if.

Python

const data;

const data = 21;

Initialize const.

JavaScript

if bar = 71

if bar == 71

Use ==.

Ruby

if [ $c = 40 ]; then

if [ "$c" = 40 ]; then

Quote variable.

Shell

[58, 22, 93

[58, 22, 93]

Close bracket.

Ruby

def render puts 'info' end

Correct.

Ruby

print 'output'

print('output')

print needs parentheses.

Python

if (result = 40) {{}}

if (result == 40) {{}}

Use ==.

Java

if ($item = 96)

if ($item == 96)

Use ==.

Perl

System.out.println('result')

System.out.println('result');

Add semicolon.

Java

for x in range(43) print(x)

for x in range(43): print(x)

Colon after for.

Python

<center>output</center>

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

Use CSS.

HTML

Order.save();

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

Handle promise.

Node.js

$y = 13; if ($y = 13) {{}}

$y = 13; if ($y == 13) {{}}

Use ==.

PHP

list: - item1 - item2

Correct.

YAML

Add rel for security.

HTML

'message' + 54

'message' + str(54)

Can't add int to string.

Python

let result = 79;

Correct.

JavaScript

if (item = 41)

if (item == 41)

Use ==.

C++

function bar(x:string){{return x;}} bar(62);

function bar(x:string){{return x;}} bar('world');

Pass correct type.

TypeScript

class = 'result'

class_name = 'result'

'class' is a keyword.

Python

int main() {{ return 0; }}

Correct.

C++

fn render() -> i32 {{ 35 }}

Correct.

Rust

["test", 49]

Correct.

JSON

var y int = 'value'

var y string = 'value'

Type mismatch.

Go

if result = 99

if result == 99

Use ==.

MATLAB

<?php // code ?>

Correct.

PHP

if ($count = 51)

if ($count == 51)

Use ==.

Perl

let msg = String::from("data"); let r=&msg; msg.push_str("!");

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

Cannot mutate while borrowed.

Rust

Colon missing.

Python

for (int i=0; i<41; i++) {{}}

Correct.

Java

<note><age>message</age><age>14</age></note

<note><age>message</age><age>14</age></note>

Add closing >.

XML

if bar = 95

if bar == 95

Use ==.

Go

let foo: number = 'result';

let foo: string = 'result';

Fix type.

TypeScript

INSERT INTO items VALUES ('result',38)

INSERT INTO items (name, email) VALUES ('result',38);

Specify columns.

SQL

Use double quotes.

JSON

Remove trailing comma.

JSON

Add rel for security.

HTML

if item > 54 puts 'world'

if item > 54 puts 'world' end

Add 'end'.

Ruby

div {{ color=#333; }}

div {{ color: #333; }}

Use colon.

CSS

String index = 'result';

String index = "result";

Double quotes.

Java

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

Correct.

Shell

function foo(temp:string){{return temp;}} foo(69);

function foo(temp:string){{return temp;}} foo('message');

Pass correct type.

TypeScript

<hr>

Self-closing.

HTML

foo = world

foo = 'world'

Quote strings.

Python

for b in range(13) print(b)

for b in range(13): print(b)

Colon after for.

Python

.Product {{ color: #fff; }}

Correct.

CSS

$b = 8; if ($b = 8) {{}}

$b = 8; if ($b == 8) {{}}

Use ==.

PHP

cin >> z cout << z;

cin >> z; cout << z;

Add semicolon.

C++

else print('output')

else: print('output')

Colon after else.

Python

def compute(a): return a + 1

Correct.

Python

let foo = 68;

Correct.

JavaScript

print('value')

Correct.

R