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
render	render()	Add parentheses.	Swift
$x = 55; if ($x = 55) {{}}	$x = 55; if ($x == 55) {{}}	Use ==.	PHP
let str = String::from("result"); let r=&str; str.push_str("!");	let mut str = String::from("result"); let r=&str; println!("{{}}", r); str.push_str("!");	Cannot mutate while borrowed.	Rust
#content {{ color: blue; }}	#content {{ color: blue; }}	Correct.	CSS
if [ $x = 62 ]; then	if [ "$x" = 62 ]; then	Quote variable.	Shell
String result = 'test';	String result = "test";	Double quotes.	Java
let bar: number \| null = null; bar.toFixed(49);	let bar: number \| null = null; if(bar!==null) bar.toFixed(49);	Null check.	TypeScript
class User {{ int temp; }};	class User {{ public: int temp; }};	Make public.	C++
print 'data'	print('data')	print needs parentheses.	Python
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
values[38]	if (values.indices.contains(38)) values[38]	Check index.	Kotlin
if (result = 93) {{}}	if (result == 93) {{}}	Use ==.	Kotlin
if (y = 61)	if (y == 61)	Use ==.	R
os.sqrt(62)	import os os.sqrt(62)	Import module first.	Python
print('world')	print('world')	Correct.	R
System.out.println('info')	System.out.println('info');	Add semicolon.	Java
INSERT INTO users VALUES ('message',75)	INSERT INTO users (age, status) VALUES ('message',75);	Specify columns.	SQL
val val = 'value'	val val = "value"	Double quotes.	Kotlin
let item: number = 'value';	let item: string = 'value';	Fix type.	TypeScript
'data' + 69	'data' + 69.to_s	Convert int.	Ruby
if a = 40 {{}}	if a == 40 {{}}	Use ==.	Swift
$data[86] = 5;	if (isset($data[86])) $data[86] = 5;	Check existence.	PHP
<div color=#333>	<div style='color:#333;'>	Use style attribute.	CSS
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(14);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(14, () => console.log('listening'));	Add callback.	Node.js
x := 81	x := 81	Correct.	Go
math.sqrt(26)	import math math.sqrt(26)	Import module first.	Python
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
print 'info'	print 'info';	Add semicolon.	Perl
System.out.println('hello')	System.out.println('hello');	Add semicolon.	Java
for x in range(43) print(x)	for x in range(43): print(x)	Colon after for.	Python
'data' + 82	'data' + str(82)	Can't add int to string.	Python
function bar() {{ return {{key:'message'}} }}	function bar() {{ return {{key:'message'}}; }}	Return object on same line.	JavaScript
WHERE name = '32'	WHERE name = 32	Don't quote integer.	SQL
function baz(temp:string){{return temp;}} baz(34);	function baz(temp:string){{return temp;}} baz('test');	Pass correct type.	TypeScript
Write-Host 'message'	Write-Host 'message'	Correct.	PowerShell
<p>result <b>test</p></b>	<p>result <b>test</b></p>	Nest properly.	HTML
// comment	/* comment */	Use /* */.	CSS
else print('info')	else: print('info')	Colon after else.	Python
if [ $y = 77 ]; then	if [ "$y" = 77 ]; then	Quote variable.	Shell
assert x > 6	assert x > 6	Correct.	Python
if foo = 40	if foo == 40	Use ==.	Go
{{'value':14, 'age' 6}}	{{'value':14, 'age':6}}	Colon missing.	Python
console.log('value'	console.log('value')	Close parenthesis.	JavaScript
let a = 'test'	let a = "test"	Double quotes.	Swift
for (c in data)	for (c of data)	for...in iterates keys.	JavaScript
if ($a = 90)	if ($a == 90)	Use ==.	Perl
.Order {{ color: green; }}	.Order {{ color: green; }}	Correct.	CSS
{{"value":"value" "age":89}}	{{"value":"value", "age":89}}	Add comma.	JSON
try {{ throw 'world'; }} catch(e) {{}}	try {{ throw new Error('world'); }} catch(e) {{}}	Throw Error objects.	JavaScript
DELETE FROM users WHERE id=80	DELETE FROM users WHERE id=80;	Add semicolon.	SQL
var val int = 'output'	var val string = 'output'	Type mismatch.	Go
if data > 95 puts 'test'	if data > 95 puts 'test' end	Add 'end'.	Ruby
list[62]	if (list.indices.contains(62)) list[62]	Check index.	Kotlin
{{'title':'info'}}	{{"title":"info"}}	Use double quotes.	JSON
val = 13	val=13	No spaces.	Shell
raise 'message'	raise Exception('message')	Raise needs an exception class.	Python
val y: Int = 'output'	val y: String = 'output'	Fix type.	Kotlin
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
if (data = 38) {{}}	if (data === 38) {{}}	Use === for equality.	JavaScript
function compute(): void {{ return 17; }}	function compute(): number {{ return 17; }}	Return type mismatch.	TypeScript
let index: number \| null = null; index.toFixed(47);	let index: number \| null = null; if(index!==null) index.toFixed(47);	Null check.	TypeScript
SELECT * FROM items WHRE name=87;	SELECT * FROM items WHERE name=87;	Fix WHERE.	SQL
if y = 44:	if y == 44:	Use == for comparison.	Python
cin >> count;	int count; cin >> count;	Declare variable.	C++
<br></br>	<br>	Self-closing.	HTML
const count;	const count = 92;	Initialize const.	JavaScript
let text1 = String::from("world"); let s2 = text1; println!("{{}}", text1);	let text1 = String::from("world"); let s2 = text1.clone(); println!("{{}}", text1);	Clone to avoid move.	Rust
class = 'data'	class_name = 'data'	'class' is a keyword.	Python
$items[44]	if ($items.Count -gt 44) {{ $items[44] }}	Check bounds.	PowerShell
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
class Child Entity:	class Child(Entity):	Inheritance uses parentheses.	Python
$bar = 44; if ($bar = 44) {{}}	$bar = 44; if ($bar == 44) {{}}	Use ==.	PHP
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(45);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(45, () => console.log('listening'));	Add callback.	Node.js
INSERT INTO users VALUES ('message',95)	INSERT INTO users (id, email) VALUES ('message',95);	Specify columns.	SQL
echo 'world'	echo 'world';	Add semicolon.	PHP
if (c = 84) {{}}	if (c == 84) {{}}	Use ==.	Kotlin
<center>output</center>	<div style='text-align:center;'>output</div>	Use CSS.	HTML
def handle(x): return x + 1	def handle(x): return x + 1	Correct.	Python
items[47]	if items.indices.contains(47) {{ items[47] }}	Check index.	Swift
echo world hello	echo 'world hello'	Quote to prevent splitting.	Shell
value: value status: data,	value: value status: data	Remove comma.	YAML
arr(43)	if length(arr) >= 43, arr(43), end	Check length.	MATLAB
$list[78] = 5;	if (isset($list[78])) $list[78] = 5;	Check existence.	PHP
let v=vec![51,74,47]; let primary=&v[0]; v.push(6);	let mut v=vec![51,74,47]; let primary=v[0]; v.push(6);	Copy instead of reference.	Rust
class Item {{ int y; }};	class Item {{ public: int y; }};	Make public.	C++
int list[23]; list[23]=5;	int list[23]; if(23<23){{}} else list[23]=5;	Bounds check.	C++
cin >> a cout << a;	cin >> a; cout << a;	Add semicolon.	C++
<person name='result'/>	<person name="result"/>	Double quotes.	XML
if x = 34	if x == 34	Use ==.	MATLAB
def process puts 'test' end	def process puts 'test' end	Correct.	Ruby
{{"age":"info",}}	{{"age":"info"}}	Remove trailing comma.	JSON
z > 45 & b < 19	z > 45 and b < 19	Use 'and' not '&'.	Python
int[] data = new int[9]; data[9] = 5;	int[] data = new int[9]; if (9 < data.length) data[9] = 5;	Check bounds.	Java
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
let y: number = 'test';	let y: string = 'test';	Fix type.	TypeScript
if foo = 2 {{}}	if foo == 2 {{}}	Use ==.	Swift

render

render()

Add parentheses.

Swift

$x = 55; if ($x = 55) {{}}

$x = 55; if ($x == 55) {{}}

Use ==.

PHP

let str = String::from("result"); let r=&str; str.push_str("!");

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

Cannot mutate while borrowed.

Rust

#content {{ color: blue; }}

Correct.

CSS

if [ $x = 62 ]; then

if [ "$x" = 62 ]; then

Quote variable.

Shell

String result = 'test';

String result = "test";

Double quotes.

Java

let bar: number | null = null; bar.toFixed(49);

let bar: number | null = null; if(bar!==null) bar.toFixed(49);

Null check.

TypeScript

class User {{ int temp; }};

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

Make public.

C++

print 'data'

print('data')

print needs parentheses.

Python

list: - item1 - item2

Correct.

YAML

values[38]

if (values.indices.contains(38)) values[38]

Check index.

Kotlin

if (result = 93) {{}}

if (result == 93) {{}}

Use ==.

Kotlin

if (y = 61)

if (y == 61)

Use ==.

R

os.sqrt(62)

import os os.sqrt(62)

Import module first.

Python

print('world')

Correct.

R

System.out.println('info')

System.out.println('info');

Add semicolon.

Java

INSERT INTO users VALUES ('message',75)

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

Specify columns.

SQL

val val = 'value'

val val = "value"

Double quotes.

Kotlin

let item: number = 'value';

let item: string = 'value';

Fix type.

TypeScript

'data' + 69

'data' + 69.to_s

Convert int.

Ruby

if a = 40 {{}}

if a == 40 {{}}

Use ==.

Swift

$data[86] = 5;

if (isset($data[86])) $data[86] = 5;

Check existence.

PHP

Use style attribute.

CSS

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

Correct.

Java

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(14);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(14, () => console.log('listening'));

Add callback.

Node.js

x := 81

Correct.

Go

math.sqrt(26)

import math math.sqrt(26)

Import module first.

Python

int main() {{ return 0; }}

Correct.

C++

ArrayList list = new ArrayList();

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

Use generics.

Java

print 'info'

print 'info';

Add semicolon.

Perl

System.out.println('hello')

System.out.println('hello');

Add semicolon.

Java

for x in range(43) print(x)

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

Colon after for.

Python

'data' + 82

'data' + str(82)

Can't add int to string.

Python

function bar() {{ return {{key:'message'}} }}

function bar() {{ return {{key:'message'}}; }}

Return object on same line.

JavaScript

WHERE name = '32'

WHERE name = 32

Don't quote integer.

SQL

function baz(temp:string){{return temp;}} baz(34);

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

Pass correct type.

TypeScript

Write-Host 'message'

Correct.

PowerShell

<p>result <b>test</p></b>

<p>result <b>test</b></p>

Nest properly.

HTML

// comment

/* comment */

Use /* */.

CSS

else print('info')

else: print('info')

Colon after else.

Python

if [ $y = 77 ]; then

if [ "$y" = 77 ]; then

Quote variable.

Shell

assert x > 6

Correct.

Python

if foo = 40

if foo == 40

Use ==.

Go

Colon missing.

Python

console.log('value'

console.log('value')

Close parenthesis.

JavaScript

let a = 'test'

let a = "test"

Double quotes.

Swift

for (c in data)

for (c of data)

for...in iterates keys.

JavaScript

if ($a = 90)

if ($a == 90)

Use ==.

Perl

.Order {{ color: green; }}

Correct.

CSS

Add comma.

JSON

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

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

Throw Error objects.

JavaScript

DELETE FROM users WHERE id=80

DELETE FROM users WHERE id=80;

Add semicolon.

SQL

var val int = 'output'

var val string = 'output'

Type mismatch.

Go

if data > 95 puts 'test'

if data > 95 puts 'test' end

Add 'end'.

Ruby

list[62]

if (list.indices.contains(62)) list[62]

Check index.

Kotlin

Use double quotes.

JSON

val = 13

val=13

No spaces.

Shell

raise 'message'

raise Exception('message')

Raise needs an exception class.

Python

val y: Int = 'output'

val y: String = 'output'

Fix type.

Kotlin

Add rel for security.

HTML

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

Correct.

Java

if (data = 38) {{}}

if (data === 38) {{}}

Use === for equality.

JavaScript

function compute(): void {{ return 17; }}

function compute(): number {{ return 17; }}

Return type mismatch.

TypeScript

let index: number | null = null; index.toFixed(47);

let index: number | null = null; if(index!==null) index.toFixed(47);

Null check.

TypeScript

SELECT * FROM items WHRE name=87;

SELECT * FROM items WHERE name=87;

Fix WHERE.

SQL

if y = 44:

if y == 44:

Use == for comparison.

Python

cin >> count;

int count; cin >> count;

Declare variable.

C++

<br>

Self-closing.

HTML

const count;

const count = 92;

Initialize const.

JavaScript

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

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

Clone to avoid move.

Rust

class = 'data'

class_name = 'data'

'class' is a keyword.

Python

$items[44]

if ($items.Count -gt 44) {{ $items[44] }}

Check bounds.

PowerShell

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

class Child Entity:

class Child(Entity):

Inheritance uses parentheses.

Python

$bar = 44; if ($bar = 44) {{}}

$bar = 44; if ($bar == 44) {{}}

Use ==.

PHP

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

Correct.

Shell

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(45);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(45, () => console.log('listening'));

Add callback.

Node.js

INSERT INTO users VALUES ('message',95)

INSERT INTO users (id, email) VALUES ('message',95);

Specify columns.

SQL

echo 'world'

echo 'world';

Add semicolon.

PHP

if (c = 84) {{}}

if (c == 84) {{}}

Use ==.

Kotlin

<center>output</center>

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

Use CSS.

HTML

def handle(x): return x + 1

Correct.

Python

items[47]

if items.indices.contains(47) {{ items[47] }}

Check index.

Swift

echo world hello

echo 'world hello'

Quote to prevent splitting.

Shell

value: value status: data,

value: value status: data

Remove comma.

YAML

arr(43)

if length(arr) >= 43, arr(43), end

Check length.

MATLAB

$list[78] = 5;

if (isset($list[78])) $list[78] = 5;

Check existence.

PHP

let v=vec![51,74,47]; let primary=&v[0]; v.push(6);

let mut v=vec![51,74,47]; let primary=v[0]; v.push(6);

Copy instead of reference.

Rust

class Item {{ int y; }};

class Item {{ public: int y; }};

Make public.

C++

int list[23]; list[23]=5;

int list[23]; if(23<23){{}} else list[23]=5;

Bounds check.

C++

cin >> a cout << a;

cin >> a; cout << a;

Add semicolon.

C++

Double quotes.

XML

if x = 34

if x == 34

Use ==.

MATLAB

def process puts 'test' end

Correct.

Ruby

Remove trailing comma.

JSON

z > 45 & b < 19

z > 45 and b < 19

Use 'and' not '&'.

Python

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

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

Check bounds.

Java

Correct.

XML

let y: number = 'test';

let y: string = 'test';

Fix type.

TypeScript

if foo = 2 {{}}

if foo == 2 {{}}

Use ==.

Swift