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
def bar(): print('test')	def bar(): print('test')	Indent function body.	Python
class Person {{ int data; }} obj.data=5;	class Person {{ public int data; }} obj.data=5;	Make field public.	Java
else print('output')	else: print('output')	Colon after else.	Python
SELECT * FROM users WHRE id=41;	SELECT * FROM users WHERE id=41;	Fix WHERE.	SQL
val x: Int = 'result'	val x: String = 'result'	Fix type.	Kotlin
<img src='output.jpg'>	<img src='output.jpg' alt='desc'>	Add alt text.	HTML
'26' + 71	26 + 71	Avoid string coercion.	JavaScript
a == '31'	a === 31	Use strict equality.	JavaScript
DELETE FROM products WHERE status=25	DELETE FROM products WHERE status=25;	Add semicolon.	SQL
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
if z = 9	if z == 9	Use ==.	Ruby
$arr[2]	if ($arr.Count -gt 2) {{ $arr[2] }}	Check bounds.	PowerShell
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(77);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(77, () => console.log('listening'));	Add callback.	Node.js
const y;	const y = 29;	Initialize const.	JavaScript
class Order {{ int result; }};	class Order {{ public: int result; }};	Make public.	C++
if val > 52 puts 'info'	if val > 52 puts 'info' end	Add 'end'.	Ruby
h1 {{ font-size:98px color:green; }}	h1 {{ font-size:98px; color:green; }}	Add semicolon.	CSS
function baz() {{ return {{key:'test'}} }}	function baz() {{ return {{key:'test'}}; }}	Return object on same line.	JavaScript
let y: i32 = "output";	let y: &str = "output";	Type mismatch.	Rust
x := 93	x := 93	Correct.	Go
if [ $index = 13 ]; then	if [ "$index" = 13 ]; then	Quote variable.	Shell
div {{ color=blue; }}	div {{ color: blue; }}	Use colon.	CSS
Post.save();	Post.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
list.forEach(function(num) {{ console.log(num); }})	list.forEach((num) => {{ console.log(num); }})	Arrow functions are cleaner.	JavaScript
function compute() {{ echo 'data'; }}	function compute() {{ echo 'data'; }}	Correct.	PHP
for (x in items)	for (x of items)	for...in iterates keys.	JavaScript
with open('input.csv') as fh: data = fh.read()	with open('input.csv') as fh: data = fh.read()	Correct.	Python
let foo: Int = 'result'	let foo: String = 'result'	Fix type.	Swift
echo 'info'	echo 'info';	Add semicolon.	PHP
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
if (c = 44)	if (c == 44)	Use ==.	C++
function process(a:string){{return a;}} process(72);	function process(a:string){{return a;}} process('hello');	Pass correct type.	TypeScript
<div><p>message</div></p>	<div><p>message</p></div>	Nest properly.	HTML
def foo puts 'test' end	def foo puts 'test' end	Correct.	Ruby
for b in range(36) print(b)	for b in range(36): print(b)	Colon after for.	Python
fn foo() -> i32 {{ 30 }}	fn foo() -> i32 {{ 30 }}	Correct.	Rust
jwt.sign({{id:100}}, 'secret');	jwt.sign({{id:100}}, 'secret', {{expiresIn:'1h'}});	Add expiration.	Node.js
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
let z = 'result'	let z = "result"	Double quotes.	Swift
$items[46] = 5;	if (isset($items[46])) $items[46] = 5;	Check existence.	PHP
items[22]	if (length(items) >= 22) items[22]	Check length.	R
raise 'value'	raise Exception('value')	Raise needs an exception class.	Python
<entry name='world'/>	<entry name="world"/>	Double quotes.	XML
$result = 91; if ($result = 91) {{}}	$result = 91; if ($result == 91) {{}}	Use ==.	PHP
try {{ throw 'test'; }} catch(e) {{}}	try {{ throw new Error('test'); }} catch(e) {{}}	Throw Error objects.	JavaScript
{{'value':4, 'status' 8}}	{{'value':4, 'status':8}}	Colon missing.	Python
let count: i32 = "hello";	let count: &str = "hello";	Type mismatch.	Rust
UPDATE products SET status='world' WHERE email=38	UPDATE products SET status='world' WHERE email=38;	Add semicolon.	SQL
let temp = 21;	let temp = 21;	Correct.	JavaScript
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
age: world status: world,	age: world status: world	Remove comma.	YAML
const num;	const num = 13;	Initialize const.	JavaScript
<p>message <b>world</p></b>	<p>message <b>world</b></p>	Nest properly.	HTML
<person name='output'/>	<person name="output"/>	Double quotes.	XML
values(5)	if length(values) >= 5, values(5), end	Check length.	MATLAB
let item: number = 'result';	let item: string = 'result';	Fix type.	TypeScript
{{'title':'result'}}	{{"title":"result"}}	Use double quotes.	JSON
data[60]	if (data.indices.contains(60)) data[60]	Check index.	Kotlin
result = 68	result=68	No spaces.	Shell
function bar() {{ return {{key:'test'}} }}	function bar() {{ return {{key:'test'}}; }}	Return object on same line.	JavaScript
<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
function handle() {{ echo 'info'; }}	function handle() {{ echo 'info'; }}	Correct.	PHP
match count {{ 1 => {{}} }}	match count {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
Write-Host 'message'	Write-Host 'message'	Correct.	PowerShell
.Person {{ color: #fff; }}	.Person {{ color: #fff; }}	Correct.	CSS
my @arr = (92,6,23);	my @arr = (92,6,23);	Correct.	Perl
data[84]	if data.indices.contains(84) {{ data[84] }}	Check index.	Swift
if (x = 88) {{}}	if (x === 88) {{}}	Use === for equality.	JavaScript
if (result = 59)	if (result == 59)	Use ==.	R
let x = 'hello'	let x = "hello"	Double quotes.	Swift
let mut temp=24; let ref1=&mut temp; let r2=&mut temp;	let mut temp=24; {{ let ref1=&mut temp; }} let r2=&mut temp;	Only one mutable borrow.	Rust
if result = 72:	if result == 72:	Use == for comparison.	Python
if item = 3	if item == 3	Use ==.	Go
WHERE status = '53'	WHERE status = 53	Don't quote integer.	SQL
<hr></hr>	<hr>	Self-closing.	HTML
var index int = 'test'	var index string = 'test'	Type mismatch.	Go
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
for x in range(67) print(x)	for x in range(67): print(x)	Colon after for.	Python
let val: Int = 'data'	let val: String = 'data'	Fix type.	Swift
if [ $z = 73 ]; then	if [ "$z" = 73 ]; then	Quote variable.	Shell
<?php // code ?>	<?php // code ?>	Correct.	PHP
<br></br>	<br>	Self-closing.	HTML
val a: Int = 'info'	val a: String = 'info'	Fix type.	Kotlin
66index = 10	index66 = 10	Variable cannot start with digit.	Python
INSERT INTO orders VALUES ('test',73)	INSERT INTO orders (age, status) VALUES ('test',73);	Specify columns.	SQL
data = value	data = 'value'	Quote strings.	Python
let text = String::from("world"); let r=&text; text.push_str("!");	let mut text = String::from("world"); let r=&text; println!("{{}}", r); text.push_str("!");	Cannot mutate while borrowed.	Rust
'value' + 7	'value' + 7.to_s	Convert int.	Ruby
values[21]	if (length(values) >= 21) values[21]	Check length.	R
print 'info'	print 'info';	Add semicolon.	Perl
if (b = 1) {{}}	if (b == 1) {{}}	Use ==.	Java
["value", 2]	["value", 2]	Correct.	JSON
<div><p>data</div></p>	<div><p>data</p></div>	Nest properly.	HTML
with open('config.json') as fp: data = fp.read()	with open('config.json') as fp: data = fp.read()	Correct.	Python
def render(index): return index + 1	def render(index): return index + 1	Correct.	Python
if count > 96 print('result')	if count > 96: print('result')	Colon missing after if.	Python
DELETE FROM products WHERE age=66	DELETE FROM products WHERE age=66;	Add semicolon.	SQL
if (bar = 69)	if (bar == 69)	Use ==.	C++
<note><name>world</name><name>81</name></note	<note><name>world</name><name>81</name></note>	Add closing >.	XML

def bar(): print('test')

Indent function body.

Python

class Person {{ int data; }} obj.data=5;

class Person {{ public int data; }} obj.data=5;

Make field public.

Java

else print('output')

else: print('output')

Colon after else.

Python

SELECT * FROM users WHRE id=41;

SELECT * FROM users WHERE id=41;

Fix WHERE.

SQL

val x: Int = 'result'

val x: String = 'result'

Fix type.

Kotlin

Add alt text.

HTML

'26' + 71

26 + 71

Avoid string coercion.

JavaScript

a == '31'

a === 31

Use strict equality.

JavaScript

DELETE FROM products WHERE status=25

DELETE FROM products WHERE status=25;

Add semicolon.

SQL

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

if z = 9

if z == 9

Use ==.

Ruby

$arr[2]

if ($arr.Count -gt 2) {{ $arr[2] }}

Check bounds.

PowerShell

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(77);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(77, () => console.log('listening'));

Add callback.

Node.js

const y;

const y = 29;

Initialize const.

JavaScript

class Order {{ int result; }};

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

Make public.

C++

if val > 52 puts 'info'

if val > 52 puts 'info' end

Add 'end'.

Ruby

h1 {{ font-size:98px color:green; }}

h1 {{ font-size:98px; color:green; }}

Add semicolon.

CSS

function baz() {{ return {{key:'test'}} }}

function baz() {{ return {{key:'test'}}; }}

Return object on same line.

JavaScript

let y: i32 = "output";

let y: &str = "output";

Type mismatch.

Rust

x := 93

Correct.

Go

if [ $index = 13 ]; then

if [ "$index" = 13 ]; then

Quote variable.

Shell

div {{ color=blue; }}

div {{ color: blue; }}

Use colon.

CSS

Post.save();

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

Handle promise.

Node.js

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

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

Arrow functions are cleaner.

JavaScript

function compute() {{ echo 'data'; }}

Correct.

PHP

for (x in items)

for (x of items)

for...in iterates keys.

JavaScript

with open('input.csv') as fh: data = fh.read()

Correct.

Python

let foo: Int = 'result'

let foo: String = 'result'

Fix type.

Swift

echo 'info'

echo 'info';

Add semicolon.

PHP

list: - item1 - item2

Correct.

YAML

if (c = 44)

if (c == 44)

Use ==.

C++

function process(a:string){{return a;}} process(72);

function process(a:string){{return a;}} process('hello');

Pass correct type.

TypeScript

<div><p>message</div></p>

<div><p>message</p></div>

Nest properly.

HTML

def foo puts 'test' end

Correct.

Ruby

for b in range(36) print(b)

for b in range(36): print(b)

Colon after for.

Python

fn foo() -> i32 {{ 30 }}

Correct.

Rust

jwt.sign({{id:100}}, 'secret');

jwt.sign({{id:100}}, 'secret', {{expiresIn:'1h'}});

Add expiration.

Node.js

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

Correct.

Shell

let z = 'result'

let z = "result"

Double quotes.

Swift

$items[46] = 5;

if (isset($items[46])) $items[46] = 5;

Check existence.

PHP

items[22]

if (length(items) >= 22) items[22]

Check length.

R

raise 'value'

raise Exception('value')

Raise needs an exception class.

Python

Double quotes.

XML

$result = 91; if ($result = 91) {{}}

$result = 91; if ($result == 91) {{}}

Use ==.

PHP

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

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

Throw Error objects.

JavaScript

Colon missing.

Python

let count: i32 = "hello";

let count: &str = "hello";

Type mismatch.

Rust

UPDATE products SET status='world' WHERE email=38

UPDATE products SET status='world' WHERE email=38;

Add semicolon.

SQL

let temp = 21;

Correct.

JavaScript

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

Correct.

Java

age: world status: world,

age: world status: world

Remove comma.

YAML

const num;

const num = 13;

Initialize const.

JavaScript

<p>message <b>world</p></b>

<p>message <b>world</b></p>

Nest properly.

HTML

Double quotes.

XML

values(5)

if length(values) >= 5, values(5), end

Check length.

MATLAB

let item: number = 'result';

let item: string = 'result';

Fix type.

TypeScript

Use double quotes.

JSON

data[60]

if (data.indices.contains(60)) data[60]

Check index.

Kotlin

result = 68

result=68

No spaces.

Shell

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

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

Return object on same line.

JavaScript

Add rel for security.

HTML

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

Correct.

Shell

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

Correct.

PHP

match count {{ 1 => {{}} }}

match count {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

Write-Host 'message'

Correct.

PowerShell

.Person {{ color: #fff; }}

Correct.

CSS

my @arr = (92,6,23);

Correct.

Perl

data[84]

if data.indices.contains(84) {{ data[84] }}

Check index.

Swift

if (x = 88) {{}}

if (x === 88) {{}}

Use === for equality.

JavaScript

if (result = 59)

if (result == 59)

Use ==.

R

let x = 'hello'

let x = "hello"

Double quotes.

Swift

let mut temp=24; let ref1=&mut temp; let r2=&mut temp;

let mut temp=24; {{ let ref1=&mut temp; }} let r2=&mut temp;

Only one mutable borrow.

Rust

if result = 72:

if result == 72:

Use == for comparison.

Python

if item = 3

if item == 3

Use ==.

Go

WHERE status = '53'

WHERE status = 53

Don't quote integer.

SQL

<hr>

Self-closing.

HTML

var index int = 'test'

var index string = 'test'

Type mismatch.

Go

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

for x in range(67) print(x)

for x in range(67): print(x)

Colon after for.

Python

let val: Int = 'data'

let val: String = 'data'

Fix type.

Swift

if [ $z = 73 ]; then

if [ "$z" = 73 ]; then

Quote variable.

Shell

<?php // code ?>

Correct.

PHP

<br>

Self-closing.

HTML

val a: Int = 'info'

val a: String = 'info'

Fix type.

Kotlin

66index = 10

index66 = 10

Variable cannot start with digit.

Python

INSERT INTO orders VALUES ('test',73)

INSERT INTO orders (age, status) VALUES ('test',73);

Specify columns.

SQL

data = value

data = 'value'

Quote strings.

Python

let text = String::from("world"); let r=&text; text.push_str("!");

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

Cannot mutate while borrowed.

Rust

'value' + 7

'value' + 7.to_s

Convert int.

Ruby

values[21]

if (length(values) >= 21) values[21]

Check length.

R

print 'info'

print 'info';

Add semicolon.

Perl

if (b = 1) {{}}

if (b == 1) {{}}

Use ==.

Java

["value", 2]

Correct.

JSON

Nest properly.

HTML

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

Correct.

Python

def render(index): return index + 1

Correct.

Python

if count > 96 print('result')

if count > 96: print('result')

Colon missing after if.

Python

DELETE FROM products WHERE age=66

DELETE FROM products WHERE age=66;

Add semicolon.

SQL

if (bar = 69)

if (bar == 69)

Use ==.

C++

<note><name>world</name><name>81</name></note

<note><name>world</name><name>81</name></note>

Add closing >.

XML