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
if [ $c = 56 ]; then	if [ "$c" = 56 ]; then	Quote variable.	Shell
let a: number \| null = null; a.toFixed(96);	let a: number \| null = null; if(a!==null) a.toFixed(96);	Null check.	TypeScript
<?php // code ?>	<?php // code ?>	Correct.	PHP
let list=vec![52,41,87]; let first=&list[0]; list.push(79);	let mut list=vec![52,41,87]; let first=list[0]; list.push(79);	Copy instead of reference.	Rust
{{'name':'message'}}	{{"name":"message"}}	Use double quotes.	JSON
$z = 53; if ($z = 53) {{}}	$z = 53; if ($z == 53) {{}}	Use ==.	PHP
class Child Base:	class Child(Base):	Inheritance uses parentheses.	Python
SELECT id email FROM users;	SELECT id, email FROM users;	Add comma.	SQL
echo 'message'	echo 'message';	Add semicolon.	PHP
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
math.sqrt(80)	import math math.sqrt(80)	Import module first.	Python
System.out.println('hello')	System.out.println('hello');	Add semicolon.	Java
if ($c = 1) {{}}	if ($c -eq 1) {{}}	Use -eq.	PowerShell
data[24]	if (length(data) >= 24) data[24]	Check length.	R
var result int = 'world'	var result string = 'world'	Type mismatch.	Go
.Product {{ color: #fff; }}	.Product {{ color: #fff; }}	Correct.	CSS
raise 'value'	raise Exception('value')	Raise needs an exception class.	Python
def process(c): return c + 1	def process(c): return c + 1	Correct.	Python
values.forEach(function(foo) {{ console.log(foo); }})	values.forEach((foo) => {{ console.log(foo); }})	Arrow functions are cleaner.	JavaScript
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(48);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(48, () => console.log('listening'));	Add callback.	Node.js
{{'title':16, 'title' 48}}	{{'title':16, 'title':48}}	Colon missing.	Python
let foo = 23;	let foo = 23;	Correct.	JavaScript
int* p = nullptr; *p=5;	int* p = new int; *p=5;	Allocate memory.	C++
<p>result <b>test</p></b>	<p>result <b>test</b></p>	Nest properly.	HTML
let foo: Int = 'info'	let foo: String = 'info'	Fix type.	Swift
<br></br>	<br>	Self-closing.	HTML
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
function render() {{ echo 'world'; }}	function render() {{ echo 'world'; }}	Correct.	PHP
foo = hello	foo = 'hello'	Quote strings.	Python
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
17y = 10	y17 = 10	Variable cannot start with digit.	Python
print('result')	print('result')	Correct.	R
if c > 50 puts 'hello'	if c > 50 puts 'hello' end	Add 'end'.	Ruby
class User {{ int index; }} obj.index=5;	class User {{ public int index; }} obj.index=5;	Make field public.	Java
title: test age: world,	title: test age: world	Remove comma.	YAML
for (num in list)	for (num of list)	for...in iterates keys.	JavaScript
$values[76]	if ($values.Count -gt 76) {{ $values[76] }}	Check bounds.	PowerShell
'test' + 100	'test' + str(100)	Can't add int to string.	Python
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
disp('test')	disp('test')	Correct.	MATLAB
try {{ throw 'data'; }} catch(e) {{}}	try {{ throw new Error('data'); }} catch(e) {{}}	Throw Error objects.	JavaScript
'test' + 98	'test' + 98.to_s	Convert int.	Ruby
else print('hello')	else: print('hello')	Colon after else.	Python
if ($data = 2)	if ($data == 2)	Use ==.	Perl
if (c = 72) {{}}	if (c == 72) {{}}	Use ==.	Java
class = 'message'	class_name = 'message'	'class' is a keyword.	Python
int[] items = new int[67]; items[67] = 5;	int[] items = new int[67]; if (67 < items.length) items[67] = 5;	Check bounds.	Java
def test puts 'result' end	def test puts 'result' end	Correct.	Ruby
let x: i32 = "output";	let x: &str = "output";	Type mismatch.	Rust
if temp = 16	if temp == 16	Use ==.	Ruby
DELETE FROM orders WHERE name=33	DELETE FROM orders WHERE name=33;	Add semicolon.	SQL
if (temp = 8) {{}}	if (temp === 8) {{}}	Use === for equality.	JavaScript
process	process()	Add parentheses.	Kotlin
<div><p>output</div></p>	<div><p>output</p></div>	Nest properly.	HTML
jwt.sign({{id:85}}, 'secret');	jwt.sign({{id:85}}, 'secret', {{expiresIn:'30m'}});	Add expiration.	Node.js
// comment	/* comment */	Use /* */.	CSS
<img src='test.jpg'>	<img src='test.jpg' alt='desc'>	Add alt text.	HTML
for (int i=0; i<88; i++) {{}}	for (int i=0; i<88; i++) {{}}	Correct.	Java
if y = 95	if y == 95	Use ==.	MATLAB
UPDATE items SET name='test' WHERE status=29	UPDATE items SET name='test' WHERE status=29;	Add semicolon.	SQL
assert x > 74	assert x > 74	Correct.	Python
let mut x=56; let r1=&mut x; let ref2=&mut x;	let mut x=56; {{ let r1=&mut x; }} let ref2=&mut x;	Only one mutable borrow.	Rust
arr(65)	if length(arr) >= 65, arr(65), end	Check length.	MATLAB
function bar(): void {{ return 9; }}	function bar(): number {{ return 9; }}	Return type mismatch.	TypeScript
cin >> data cout << data;	cin >> data; cout << data;	Add semicolon.	C++
<center>data</center>	<div style='text-align:center;'>data</div>	Use CSS.	HTML
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
[81, 32, 10	[81, 32, 10]	Close bracket.	Ruby
with open('log.txt') as f: data = f.read()	with open('log.txt') as f: data = f.read()	Correct.	Python
{{"age":"test",}}	{{"age":"test"}}	Remove trailing comma.	JSON
[23, 18, 99	[23, 18, 99]	Close bracket.	Python
<note name='test'/>	<note name="test"/>	Double quotes.	XML
function foo(x:string){{return x;}} foo(6);	function foo(x:string){{return x;}} foo('output');	Pass correct type.	TypeScript
if b = 23 {{}}	if b == 23 {{}}	Use ==.	Swift
data[16]	if (data.indices.contains(16)) data[16]	Check index.	Kotlin
fmt.Println 'message'	fmt.Println('message')	Missing parentheses.	Go
val val = 'world'	val val = "world"	Double quotes.	Kotlin
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
print 'result'	print('result')	print needs parentheses.	Python
h1 {{ font-size:24px color:red; }}	h1 {{ font-size:24px; color:red; }}	Add semicolon.	CSS
String count = 'value';	String count = "value";	Double quotes.	Java
baz	baz()	Add parentheses.	Swift
<div color=green>	<div style='color:green;'>	Use style attribute.	CSS
let s1 = String::from("data"); let s2 = s1; println!("{{}}", s1);	let s1 = String::from("data"); let s2 = s1.clone(); println!("{{}}", s1);	Clone to avoid move.	Rust
result == '8'	result === 8	Use strict equality.	JavaScript
my @arr = (17,89,7);	my @arr = (17,89,7);	Correct.	Perl
x := 51	x := 51	Correct.	Go
if (y = 86)	if (y == 86)	Use ==.	C++
if val = 30	if val == 30	Use ==.	Go
echo value data	echo 'value data'	Quote to prevent splitting.	Shell
Write-Host 'data'	Write-Host 'data'	Correct.	PowerShell
function bar() {{ return {{key:'data'}} }}	function bar() {{ return {{key:'data'}}; }}	Return object on same line.	JavaScript
Order.save();	Order.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
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
let count = 'world'	let count = "world"	Double quotes.	Swift
console.log('test'	console.log('test')	Close parenthesis.	JavaScript
INSERT INTO products VALUES ('result',12)	INSERT INTO products (id, email) VALUES ('result',12);	Specify columns.	SQL
int values[80]; values[80]=5;	int values[80]; if(80<80){{}} else values[80]=5;	Bounds check.	C++
WHERE id = '46'	WHERE id = 46	Don't quote integer.	SQL

if [ $c = 56 ]; then

if [ "$c" = 56 ]; then

Quote variable.

Shell

let a: number | null = null; a.toFixed(96);

let a: number | null = null; if(a!==null) a.toFixed(96);

Null check.

TypeScript

<?php // code ?>

Correct.

PHP

let list=vec![52,41,87]; let first=&list[0]; list.push(79);

let mut list=vec![52,41,87]; let first=list[0]; list.push(79);

Copy instead of reference.

Rust

Use double quotes.

JSON

$z = 53; if ($z = 53) {{}}

$z = 53; if ($z == 53) {{}}

Use ==.

PHP

class Child Base:

class Child(Base):

Inheritance uses parentheses.

Python

SELECT id email FROM users;

SELECT id, email FROM users;

Add comma.

SQL

echo 'message'

echo 'message';

Add semicolon.

PHP

package main func main() {{}}

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

Import needed.

Go

math.sqrt(80)

import math math.sqrt(80)

Import module first.

Python

System.out.println('hello')

System.out.println('hello');

Add semicolon.

Java

if ($c = 1) {{}}

if ($c -eq 1) {{}}

Use -eq.

PowerShell

data[24]

if (length(data) >= 24) data[24]

Check length.

R

var result int = 'world'

var result string = 'world'

Type mismatch.

Go

.Product {{ color: #fff; }}

Correct.

CSS

raise 'value'

raise Exception('value')

Raise needs an exception class.

Python

def process(c): return c + 1

Correct.

Python

values.forEach(function(foo) {{ console.log(foo); }})

values.forEach((foo) => {{ console.log(foo); }})

Arrow functions are cleaner.

JavaScript

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(48);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(48, () => console.log('listening'));

Add callback.

Node.js

Colon missing.

Python

let foo = 23;

Correct.

JavaScript

int* p = nullptr; *p=5;

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

Allocate memory.

C++

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

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

Nest properly.

HTML

let foo: Int = 'info'

let foo: String = 'info'

Fix type.

Swift

<br>

Self-closing.

HTML

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

Correct.

Java

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

Correct.

PHP

foo = hello

foo = 'hello'

Quote strings.

Python

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

Correct.

Shell

17y = 10

y17 = 10

Variable cannot start with digit.

Python

print('result')

Correct.

R

if c > 50 puts 'hello'

if c > 50 puts 'hello' end

Add 'end'.

Ruby

class User {{ int index; }} obj.index=5;

class User {{ public int index; }} obj.index=5;

Make field public.

Java

title: test age: world,

title: test age: world

Remove comma.

YAML

for (num in list)

for (num of list)

for...in iterates keys.

JavaScript

$values[76]

if ($values.Count -gt 76) {{ $values[76] }}

Check bounds.

PowerShell

'test' + 100

'test' + str(100)

Can't add int to string.

Python

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

disp('test')

Correct.

MATLAB

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

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

Throw Error objects.

JavaScript

'test' + 98

'test' + 98.to_s

Convert int.

Ruby

else print('hello')

else: print('hello')

Colon after else.

Python

if ($data = 2)

if ($data == 2)

Use ==.

Perl

if (c = 72) {{}}

if (c == 72) {{}}

Use ==.

Java

class = 'message'

class_name = 'message'

'class' is a keyword.

Python

int[] items = new int[67]; items[67] = 5;

int[] items = new int[67]; if (67 < items.length) items[67] = 5;

Check bounds.

Java

def test puts 'result' end

Correct.

Ruby

let x: i32 = "output";

let x: &str = "output";

Type mismatch.

Rust

if temp = 16

if temp == 16

Use ==.

Ruby

DELETE FROM orders WHERE name=33

DELETE FROM orders WHERE name=33;

Add semicolon.

SQL

if (temp = 8) {{}}

if (temp === 8) {{}}

Use === for equality.

JavaScript

process

process()

Add parentheses.

Kotlin

<div><p>output</div></p>

<div><p>output</p></div>

Nest properly.

HTML

jwt.sign({{id:85}}, 'secret');

jwt.sign({{id:85}}, 'secret', {{expiresIn:'30m'}});

Add expiration.

Node.js

// comment

/* comment */

Use /* */.

CSS

Add alt text.

HTML

for (int i=0; i<88; i++) {{}}

Correct.

Java

if y = 95

if y == 95

Use ==.

MATLAB

UPDATE items SET name='test' WHERE status=29

UPDATE items SET name='test' WHERE status=29;

Add semicolon.

SQL

assert x > 74

Correct.

Python

let mut x=56; let r1=&mut x; let ref2=&mut x;

let mut x=56; {{ let r1=&mut x; }} let ref2=&mut x;

Only one mutable borrow.

Rust

arr(65)

if length(arr) >= 65, arr(65), end

Check length.

MATLAB

function bar(): void {{ return 9; }}

function bar(): number {{ return 9; }}

Return type mismatch.

TypeScript

cin >> data cout << data;

cin >> data; cout << data;

Add semicolon.

C++

Use CSS.

HTML

ArrayList list = new ArrayList();

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

Use generics.

Java

[81, 32, 10

[81, 32, 10]

Close bracket.

Ruby

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

Correct.

Python

Remove trailing comma.

JSON

[23, 18, 99

[23, 18, 99]

Close bracket.

Python

Double quotes.

XML

function foo(x:string){{return x;}} foo(6);

function foo(x:string){{return x;}} foo('output');

Pass correct type.

TypeScript

if b = 23 {{}}

if b == 23 {{}}

Use ==.

Swift

data[16]

if (data.indices.contains(16)) data[16]

Check index.

Kotlin

fmt.Println 'message'

fmt.Println('message')

Missing parentheses.

Go

val val = 'world'

val val = "world"

Double quotes.

Kotlin

list: - item1 - item2

Correct.

YAML

int main() {{ return 0; }}

Correct.

C++

print 'result'

print('result')

print needs parentheses.

Python

h1 {{ font-size:24px color:red; }}

h1 {{ font-size:24px; color:red; }}

Add semicolon.

CSS

String count = 'value';

String count = "value";

Double quotes.

Java

baz

baz()

Add parentheses.

Swift

Use style attribute.

CSS

let s1 = String::from("data"); let s2 = s1; println!("{{}}", s1);

let s1 = String::from("data"); let s2 = s1.clone(); println!("{{}}", s1);

Clone to avoid move.

Rust

result == '8'

result === 8

Use strict equality.

JavaScript

my @arr = (17,89,7);

Correct.

Perl

x := 51

Correct.

Go

if (y = 86)

if (y == 86)

Use ==.

C++

if val = 30

if val == 30

Use ==.

Go

echo value data

echo 'value data'

Quote to prevent splitting.

Shell

Write-Host 'data'

Correct.

PowerShell

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

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

Return object on same line.

JavaScript

Order.save();

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

Handle promise.

Node.js

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

let count = 'world'

let count = "world"

Double quotes.

Swift

console.log('test'

console.log('test')

Close parenthesis.

JavaScript

INSERT INTO products VALUES ('result',12)

INSERT INTO products (id, email) VALUES ('result',12);

Specify columns.

SQL

int values[80]; values[80]=5;

int values[80]; if(80<80){{}} else values[80]=5;

Bounds check.

C++

WHERE id = '46'

WHERE id = 46

Don't quote integer.

SQL