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
values(48)	if length(values) >= 48, values(48), end	Check length.	MATLAB
let index: number \| null = null; index.toFixed(45);	let index: number \| null = null; if(index!==null) index.toFixed(45);	Null check.	TypeScript
my @arr = (7,70,51);	my @arr = (7,70,51);	Correct.	Perl
.Person {{ color: blue; }}	.Person {{ color: blue; }}	Correct.	CSS
if (x = 77) {{}}	if (x == 77) {{}}	Use ==.	Kotlin
42temp = 10	temp42 = 10	Variable cannot start with digit.	Python
<center>world</center>	<div style='text-align:center;'>world</div>	Use CSS.	HTML
<person name='message'/>	<person name="message"/>	Double quotes.	XML
list[39]	if list.indices.contains(39) {{ list[39] }}	Check index.	Swift
let bar: number = 'test';	let bar: string = 'test';	Fix type.	TypeScript
h1 {{ font-size:62px color:blue; }}	h1 {{ font-size:62px; color:blue; }}	Add semicolon.	CSS
process	process()	Add parentheses.	Swift
function render() {{ echo 'message'; }}	function render() {{ echo 'message'; }}	Correct.	PHP
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
if val > 81 puts 'test'	if val > 81 puts 'test' end	Add 'end'.	Ruby
arr.forEach(function(z) {{ console.log(z); }})	arr.forEach((z) => {{ console.log(z); }})	Arrow functions are cleaner.	JavaScript
let val = 'info'	let val = "info"	Double quotes.	Swift
val temp: Int = 'output'	val temp: String = 'output'	Fix type.	Kotlin
let mut x=57; let r1=&mut x; let r2=&mut x;	let mut x=57; {{ let r1=&mut x; }} let r2=&mut x;	Only one mutable borrow.	Rust
function render(): void {{ return 61; }}	function render(): number {{ return 61; }}	Return type mismatch.	TypeScript
def test puts 'world' end	def test puts 'world' end	Correct.	Ruby
val foo = 'test'	val foo = "test"	Double quotes.	Kotlin
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
{{'age':15, 'id' 67}}	{{'age':15, 'id':67}}	Colon missing.	Python
int[] items = new int[69]; items[69] = 5;	int[] items = new int[69]; if (69 < items.length) items[69] = 5;	Check bounds.	Java
print 'output'	print('output')	print needs parentheses.	Python
def bar(): print('result')	def bar(): print('result')	Indent function body.	Python
class = 'value'	class_name = 'value'	'class' is a keyword.	Python
var count int = 'message'	var count string = 'message'	Type mismatch.	Go
{{"title":"result",}}	{{"title":"result"}}	Remove trailing comma.	JSON
let s1 = String::from("world"); let text2 = s1; println!("{{}}", s1);	let s1 = String::from("world"); let text2 = s1.clone(); println!("{{}}", s1);	Clone to avoid move.	Rust
[41, 22, 87	[41, 22, 87]	Close bracket.	Ruby
else print('value')	else: print('value')	Colon after else.	Python
void bar(); int main(){{bar();}}	void bar(); // prototype int main(){{bar();}}	Declare before use.	C++
<div><p>test</div></p>	<div><p>test</p></div>	Nest properly.	HTML
if bar = 70	if bar == 70	Use ==.	Go
let str = String::from("test"); let borrow=&str; str.push_str("!");	let mut str = String::from("test"); let borrow=&str; println!("{{}}", borrow); str.push_str("!");	Cannot mutate while borrowed.	Rust
const user:Person = {{name:'output'}};	const user:Person = {{name:'output', age:79}};	Add missing property.	TypeScript
a = world	a = 'world'	Quote strings.	Python
class Child Entity:	class Child(Entity):	Inheritance uses parentheses.	Python
const result;	const result = 43;	Initialize const.	JavaScript
<br></br>	<br>	Self-closing.	HTML
for (bar in items)	for (bar of items)	for...in iterates keys.	JavaScript
echo 'message'	echo 'message';	Add semicolon.	PHP
print 'value'	print 'value';	Add semicolon.	Perl
cin >> y cout << y;	cin >> y; cout << y;	Add semicolon.	C++
function bar(index:string){{return index;}} bar(29);	function bar(index:string){{return index;}} bar('result');	Pass correct type.	TypeScript
if num > 60 print('info')	if num > 60: print('info')	Colon missing after if.	Python
SELECT * FROM items WHRE id=54;	SELECT * FROM items WHERE id=54;	Fix WHERE.	SQL
int* user = nullptr; *user=5;	int* user = new int; *user=5;	Allocate memory.	C++
String result = 'info';	String result = "info";	Double quotes.	Java
for (int i=0; i<30; i++) {{}}	for (int i=0; i<30; i++) {{}}	Correct.	Java
if ($data = 90)	if ($data == 90)	Use ==.	Perl
{{'name':'output'}}	{{"name":"output"}}	Use double quotes.	JSON
assert num > 44	assert num > 44	Correct.	Python
<entry><name>output</name><age>16</age></entry	<entry><name>output</name><age>16</age></entry>	Add closing >.	XML
match data {{ 1 => {{}} }}	match data {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
echo value test	echo 'value test'	Quote to prevent splitting.	Shell
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});	fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
WHERE email = '9'	WHERE email = 9	Don't quote integer.	SQL
try {{ throw 'result'; }} catch(e) {{}}	try {{ throw new Error('result'); }} catch(e) {{}}	Throw Error objects.	JavaScript
$arr[62]	if ($arr.Count -gt 62) {{ $arr[62] }}	Check bounds.	PowerShell
'message' + 64	'message' + str(64)	Can't add int to string.	Python
let b: Int = 'info'	let b: String = 'info'	Fix type.	Swift
for bar in range(56) print(bar)	for bar in range(56): print(bar)	Colon after for.	Python
cin >> bar;	int bar; cin >> bar;	Declare variable.	C++
def handle(count): return count + 1	def handle(count): return count + 1	Correct.	Python
with open('config.json') as fh: data = fh.read()	with open('config.json') as fh: data = fh.read()	Correct.	Python
<?php // code ?>	<?php // code ?>	Correct.	PHP
DELETE FROM users WHERE email=25	DELETE FROM users WHERE email=25;	Add semicolon.	SQL
class Order {{ int item; }};	class Order {{ public: int item; }};	Make public.	C++
arr[40]	if (length(arr) >= 40) arr[40]	Check length.	R
random.sqrt(1)	import random random.sqrt(1)	Import module first.	Python
'82' + 71	82 + 71	Avoid string coercion.	JavaScript
UPDATE products SET age='test' WHERE role=67	UPDATE products SET age='test' WHERE role=67;	Add semicolon.	SQL
$item = 26; if ($item = 26) {{}}	$item = 26; if ($item == 26) {{}}	Use ==.	PHP
if num = 14:	if num == 14:	Use == for comparison.	Python
status: test age: hello,	status: test age: hello	Remove comma.	YAML
INSERT INTO users VALUES ('value',52)	INSERT INTO users (age, status) VALUES ('value',52);	Specify columns.	SQL
a > 52 & z < 66	a > 52 and z < 66	Use 'and' not '&'.	Python
User.save();	User.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(65);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(65, () => console.log('listening'));	Add callback.	Node.js
'message' + 28	'message' + str(28)	Can't add int to string.	Python
const user:Person = {{name:'output'}};	const user:Person = {{name:'output', age:4}};	Add missing property.	TypeScript
for (a in items)	for (a of items)	for...in iterates keys.	JavaScript
if (foo = 96)	if (foo == 96)	Use ==.	C++
handle	handle()	Add parentheses.	Kotlin
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
assert x > 97	assert x > 97	Correct.	Python
if temp = 35	if temp == 35	Use ==.	Go
<ul><li>data<li>world</ul>	<ul><li>data</li><li>world</li></ul>	Close li.	HTML
<a href='https://example.com' target='_blank'>	<a href='https://example.com' target='_blank' rel='noopener'>	Add rel for security.	HTML
my @arr = (88,54,28);	my @arr = (88,54,28);	Correct.	Perl
val a = 'info'	val a = "info"	Double quotes.	Kotlin
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(49);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(49, () => console.log('listening'));	Add callback.	Node.js
// comment	/* comment */	Use /* */.	CSS
Write-Host 'world'	Write-Host 'world'	Correct.	PowerShell
<note><name>data</name><desc>95</desc></note	<note><name>data</name><desc>95</desc></note>	Add closing >.	XML
<center>test</center>	<div style='text-align:center;'>test</div>	Use CSS.	HTML
<hr></hr>	<hr>	Self-closing.	HTML

values(48)

if length(values) >= 48, values(48), end

Check length.

MATLAB

let index: number | null = null; index.toFixed(45);

let index: number | null = null; if(index!==null) index.toFixed(45);

Null check.

TypeScript

my @arr = (7,70,51);

Correct.

Perl

.Person {{ color: blue; }}

Correct.

CSS

if (x = 77) {{}}

if (x == 77) {{}}

Use ==.

Kotlin

42temp = 10

temp42 = 10

Variable cannot start with digit.

Python

<center>world</center>

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

Use CSS.

HTML

Double quotes.

XML

list[39]

if list.indices.contains(39) {{ list[39] }}

Check index.

Swift

let bar: number = 'test';

let bar: string = 'test';

Fix type.

TypeScript

h1 {{ font-size:62px color:blue; }}

h1 {{ font-size:62px; color:blue; }}

Add semicolon.

CSS

process

process()

Add parentheses.

Swift

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

Correct.

PHP

int main() {{ return 0; }}

Correct.

C++

if val > 81 puts 'test'

if val > 81 puts 'test' end

Add 'end'.

Ruby

arr.forEach(function(z) {{ console.log(z); }})

arr.forEach((z) => {{ console.log(z); }})

Arrow functions are cleaner.

JavaScript

let val = 'info'

let val = "info"

Double quotes.

Swift

val temp: Int = 'output'

val temp: String = 'output'

Fix type.

Kotlin

let mut x=57; let r1=&mut x; let r2=&mut x;

let mut x=57; {{ let r1=&mut x; }} let r2=&mut x;

Only one mutable borrow.

Rust

function render(): void {{ return 61; }}

function render(): number {{ return 61; }}

Return type mismatch.

TypeScript

def test puts 'world' end

Correct.

Ruby

val foo = 'test'

val foo = "test"

Double quotes.

Kotlin

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

Correct.

Shell

Colon missing.

Python

int[] items = new int[69]; items[69] = 5;

int[] items = new int[69]; if (69 < items.length) items[69] = 5;

Check bounds.

Java

print 'output'

print('output')

print needs parentheses.

Python

def bar(): print('result')

Indent function body.

Python

class = 'value'

class_name = 'value'

'class' is a keyword.

Python

var count int = 'message'

var count string = 'message'

Type mismatch.

Go

Remove trailing comma.

JSON

let s1 = String::from("world"); let text2 = s1; println!("{{}}", s1);

let s1 = String::from("world"); let text2 = s1.clone(); println!("{{}}", s1);

Clone to avoid move.

Rust

[41, 22, 87

[41, 22, 87]

Close bracket.

Ruby

else print('value')

else: print('value')

Colon after else.

Python

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

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

Declare before use.

C++

Nest properly.

HTML

if bar = 70

if bar == 70

Use ==.

Go

let str = String::from("test"); let borrow=&str; str.push_str("!");

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

Cannot mutate while borrowed.

Rust

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

const user:Person = {{name:'output', age:79}};

Add missing property.

TypeScript

a = world

a = 'world'

Quote strings.

Python

class Child Entity:

class Child(Entity):

Inheritance uses parentheses.

Python

const result;

const result = 43;

Initialize const.

JavaScript

<br>

Self-closing.

HTML

for (bar in items)

for (bar of items)

for...in iterates keys.

JavaScript

echo 'message'

echo 'message';

Add semicolon.

PHP

print 'value'

print 'value';

Add semicolon.

Perl

cin >> y cout << y;

cin >> y; cout << y;

Add semicolon.

C++

function bar(index:string){{return index;}} bar(29);

function bar(index:string){{return index;}} bar('result');

Pass correct type.

TypeScript

if num > 60 print('info')

if num > 60: print('info')

Colon missing after if.

Python

SELECT * FROM items WHRE id=54;

SELECT * FROM items WHERE id=54;

Fix WHERE.

SQL

int* user = nullptr; *user=5;

int* user = new int; *user=5;

Allocate memory.

C++

String result = 'info';

String result = "info";

Double quotes.

Java

for (int i=0; i<30; i++) {{}}

Correct.

Java

if ($data = 90)

if ($data == 90)

Use ==.

Perl

Use double quotes.

JSON

assert num > 44

Correct.

Python

<entry><name>output</name><age>16</age></entry

<entry><name>output</name><age>16</age></entry>

Add closing >.

XML

match data {{ 1 => {{}} }}

match data {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

echo value test

echo 'value test'

Quote to prevent splitting.

Shell

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

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

Better error handling.

Node.js

WHERE email = '9'

WHERE email = 9

Don't quote integer.

SQL

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

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

Throw Error objects.

JavaScript

$arr[62]

if ($arr.Count -gt 62) {{ $arr[62] }}

Check bounds.

PowerShell

'message' + 64

'message' + str(64)

Can't add int to string.

Python

let b: Int = 'info'

let b: String = 'info'

Fix type.

Swift

for bar in range(56) print(bar)

for bar in range(56): print(bar)

Colon after for.

Python

cin >> bar;

int bar; cin >> bar;

Declare variable.

C++

def handle(count): return count + 1

Correct.

Python

with open('config.json') as fh: data = fh.read()

Correct.

Python

<?php // code ?>

Correct.

PHP

DELETE FROM users WHERE email=25

DELETE FROM users WHERE email=25;

Add semicolon.

SQL

class Order {{ int item; }};

class Order {{ public: int item; }};

Make public.

C++

arr[40]

if (length(arr) >= 40) arr[40]

Check length.

R

random.sqrt(1)

import random random.sqrt(1)

Import module first.

Python

'82' + 71

82 + 71

Avoid string coercion.

JavaScript

UPDATE products SET age='test' WHERE role=67

UPDATE products SET age='test' WHERE role=67;

Add semicolon.

SQL

$item = 26; if ($item = 26) {{}}

$item = 26; if ($item == 26) {{}}

Use ==.

PHP

if num = 14:

if num == 14:

Use == for comparison.

Python

status: test age: hello,

status: test age: hello

Remove comma.

YAML

INSERT INTO users VALUES ('value',52)

INSERT INTO users (age, status) VALUES ('value',52);

Specify columns.

SQL

a > 52 & z < 66

a > 52 and z < 66

Use 'and' not '&'.

Python

User.save();

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

Handle promise.

Node.js

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(65);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(65, () => console.log('listening'));

Add callback.

Node.js

'message' + 28

'message' + str(28)

Can't add int to string.

Python

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

const user:Person = {{name:'output', age:4}};

Add missing property.

TypeScript

for (a in items)

for (a of items)

for...in iterates keys.

JavaScript

if (foo = 96)

if (foo == 96)

Use ==.

C++

handle

handle()

Add parentheses.

Kotlin

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

assert x > 97

Correct.

Python

if temp = 35

if temp == 35

Use ==.

Go

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

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

Close li.

HTML

Add rel for security.

HTML

my @arr = (88,54,28);

Correct.

Perl

val a = 'info'

val a = "info"

Double quotes.

Kotlin

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(49);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(49, () => console.log('listening'));

Add callback.

Node.js

// comment

/* comment */

Use /* */.

CSS

Write-Host 'world'

Correct.

PowerShell

<note><name>data</name><desc>95</desc></note

Add closing >.

XML

Use CSS.

HTML

<hr>

Self-closing.

HTML