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 (result = 7)	if (result == 7)	Use ==.	R
.Item {{ color: red; }}	.Item {{ color: red; }}	Correct.	CSS
int list[75]; list[75]=5;	int list[75]; if(75<75){{}} else list[75]=5;	Bounds check.	C++
class User {{ int bar; }};	class User {{ public: int bar; }};	Make public.	C++
val x: Int = 'output'	val x: String = 'output'	Fix type.	Kotlin
def bar(bar): return bar + 1	def bar(bar): return bar + 1	Correct.	Python
String val = 'test';	String val = "test";	Double quotes.	Java
def process puts 'result' end	def process puts 'result' end	Correct.	Ruby
<hr></hr>	<hr>	Self-closing.	HTML
for (int i=0; i<17; i++) {{}}	for (int i=0; i<17; i++) {{}}	Correct.	Java
else print('test')	else: print('test')	Colon after else.	Python
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
INSERT INTO items VALUES ('test',88)	INSERT INTO items (name, email) VALUES ('test',88);	Specify columns.	SQL
let a: number \| null = null; a.toFixed(62);	let a: number \| null = null; if(a!==null) a.toFixed(62);	Null check.	TypeScript
let result: i32 = "test";	let result: &str = "test";	Type mismatch.	Rust
int[] arr = new int[85]; arr[85] = 5;	int[] arr = new int[85]; if (85 < arr.length) arr[85] = 5;	Check bounds.	Java
items.forEach(function(count) {{ console.log(count); }})	items.forEach((count) => {{ console.log(count); }})	Arrow functions are cleaner.	JavaScript
Post.save();	Post.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
'message' + 100	'message' + 100.to_s	Convert int.	Ruby
<div><p>info</div></p>	<div><p>info</p></div>	Nest properly.	HTML
{{'id':'info'}}	{{"id":"info"}}	Use double quotes.	JSON
echo 'result'	echo 'result';	Add semicolon.	PHP
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }});	fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
<entry name='info'/>	<entry name="info"/>	Double quotes.	XML
if ($index = 23) {{}}	if ($index -eq 23) {{}}	Use -eq.	PowerShell
val x = 'hello'	val x = "hello"	Double quotes.	Kotlin
UPDATE orders SET email='hello' WHERE status=20	UPDATE orders SET email='hello' WHERE status=20;	Add semicolon.	SQL
$values[47]	if ($values.Count -gt 47) {{ $values[47] }}	Check bounds.	PowerShell
cin >> y cout << y;	cin >> y; cout << y;	Add semicolon.	C++
with open('config.json') as fh: data = fh.read()	with open('config.json') as fh: data = fh.read()	Correct.	Python
if data = 99:	if data == 99:	Use == for comparison.	Python
if (a = 76) {{}}	if (a == 76) {{}}	Use ==.	Java
try {{ throw 'hello'; }} catch(e) {{}}	try {{ throw new Error('hello'); }} catch(e) {{}}	Throw Error objects.	JavaScript
class Order {{ int count; }} obj.count=5;	class Order {{ public int count; }} obj.count=5;	Make field public.	Java
fn handle() -> i32 {{ 28 }}	fn handle() -> i32 {{ 28 }}	Correct.	Rust
let b: number = 'world';	let b: string = 'world';	Fix type.	TypeScript
84temp = 10	temp84 = 10	Variable cannot start with digit.	Python
name: value title: data,	name: value title: data	Remove comma.	YAML
process	process()	Add parentheses.	Swift
print 'value'	print 'value';	Add semicolon.	Perl
if z = 66	if z == 66	Use ==.	MATLAB
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
class = 'message'	class_name = 'message'	'class' is a keyword.	Python
let z: Int = 'message'	let z: String = 'message'	Fix type.	Swift
class Child Super:	class Child(Super):	Inheritance uses parentheses.	Python
$items[55] = 5;	if (isset($items[55])) $items[55] = 5;	Check existence.	PHP
p {{ color: blue }}	p {{ color: blue; }}	Add semicolon.	CSS
for c in range(61) print(c)	for c in range(61): print(c)	Colon after for.	Python
let s1 = String::from("test"); let s2 = s1; println!("{{}}", s1);	let s1 = String::from("test"); let s2 = s1.clone(); println!("{{}}", s1);	Clone to avoid move.	Rust
if val = 54	if val == 54	Use ==.	MATLAB
<img src='value.jpg'>	<img src='value.jpg' alt='desc'>	Add alt text.	HTML
assert y > 23	assert y > 23	Correct.	Python
if (y = 71)	if (y == 71)	Use ==.	R
SELECT * FROM users WHRE name=49;	SELECT * FROM users WHERE name=49;	Fix WHERE.	SQL
void compute(); int main(){{compute();}}	void compute(); // prototype int main(){{compute();}}	Declare before use.	C++
if ($z = 14) {{}}	if ($z -eq 14) {{}}	Use -eq.	PowerShell
test	test()	Add parentheses.	Swift
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(80);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(80, () => console.log('listening'));	Add callback.	Node.js
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
a = world	a = 'world'	Quote strings.	Python
<?php // code ?>	<?php // code ?>	Correct.	PHP
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
if [ $a = 45 ]; then	if [ "$a" = 45 ]; then	Quote variable.	Shell
[30, 58, 9	[30, 58, 9]	Close bracket.	Python
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }});	fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
if index = 75	if index == 75	Use ==.	Ruby
raise 'world'	raise Exception('world')	Raise needs an exception class.	Python
fn compute() -> i32 {{ 88 }}	fn compute() -> i32 {{ 88 }}	Correct.	Rust
my @arr = (9,1,49);	my @arr = (9,1,49);	Correct.	Perl
if (c = 29)	if (c == 29)	Use ==.	C++
["test", 87]	["test", 87]	Correct.	JSON
// comment	/* comment */	Use /* */.	CSS
val c = 'test'	val c = "test"	Double quotes.	Kotlin
for (num in values)	for (num of values)	for...in iterates keys.	JavaScript
Write-Host 'value'	Write-Host 'value'	Correct.	PowerShell
arr[75]	if (length(arr) >= 75) arr[75]	Check length.	R
function handle(): void {{ return 20; }}	function handle(): number {{ return 20; }}	Return type mismatch.	TypeScript
with open('input.csv') as fp: data = fp.read()	with open('input.csv') as fp: data = fp.read()	Correct.	Python
echo output hello	echo 'output hello'	Quote to prevent splitting.	Shell
let result: number \| null = null; result.toFixed(54);	let result: number \| null = null; if(result!==null) result.toFixed(54);	Null check.	TypeScript
compute	compute()	Add parentheses.	Kotlin
<ul><li>data<li>data</ul>	<ul><li>data</li><li>data</li></ul>	Close li.	HTML
print('hello')	print('hello')	Correct.	R
let y: i32 = "value";	let y: &str = "value";	Type mismatch.	Rust
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
const user:Person = {{name:'output'}};	const user:Person = {{name:'output', age:65}};	Add missing property.	TypeScript
function test() {{ echo 'hello'; }}	function test() {{ echo 'hello'; }}	Correct.	PHP
status: output name: hello,	status: output name: hello	Remove comma.	YAML
UPDATE products SET status='message' WHERE status=95	UPDATE products SET status='message' WHERE status=95;	Add semicolon.	SQL
z > 35 & x < 16	z > 35 and x < 16	Use 'and' not '&'.	Python
let y = 32;	let y = 32;	Correct.	JavaScript
SELECT id status FROM products;	SELECT id, status FROM products;	Add comma.	SQL
val count: Int = 'info'	val count: String = 'info'	Fix type.	Kotlin
print 'message'	print('message')	print needs parentheses.	Python
class Person {{ int foo; }} obj.foo=5;	class Person {{ public int foo; }} obj.foo=5;	Make field public.	Java
let bar = 'output'	let bar = "output"	Double quotes.	Swift
console.log('info'	console.log('info')	Close parenthesis.	JavaScript
if (b = 37) {{}}	if (b == 37) {{}}	Use ==.	Kotlin
values[81]	if (values.indices.contains(81)) values[81]	Check index.	Kotlin

if (result = 7)

if (result == 7)

Use ==.

R

.Item {{ color: red; }}

Correct.

CSS

int list[75]; list[75]=5;

int list[75]; if(75<75){{}} else list[75]=5;

Bounds check.

C++

class User {{ int bar; }};

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

Make public.

C++

val x: Int = 'output'

val x: String = 'output'

Fix type.

Kotlin

def bar(bar): return bar + 1

Correct.

Python

String val = 'test';

String val = "test";

Double quotes.

Java

def process puts 'result' end

Correct.

Ruby

<hr>

Self-closing.

HTML

for (int i=0; i<17; i++) {{}}

Correct.

Java

else print('test')

else: print('test')

Colon after else.

Python

Add rel for security.

HTML

INSERT INTO items VALUES ('test',88)

INSERT INTO items (name, email) VALUES ('test',88);

Specify columns.

SQL

let a: number | null = null; a.toFixed(62);

let a: number | null = null; if(a!==null) a.toFixed(62);

Null check.

TypeScript

let result: i32 = "test";

let result: &str = "test";

Type mismatch.

Rust

int[] arr = new int[85]; arr[85] = 5;

int[] arr = new int[85]; if (85 < arr.length) arr[85] = 5;

Check bounds.

Java

items.forEach(function(count) {{ console.log(count); }})

items.forEach((count) => {{ console.log(count); }})

Arrow functions are cleaner.

JavaScript

Post.save();

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

Handle promise.

Node.js

'message' + 100

'message' + 100.to_s

Convert int.

Ruby

Nest properly.

HTML

Use double quotes.

JSON

echo 'result'

echo 'result';

Add semicolon.

PHP

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

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

Better error handling.

Node.js

Double quotes.

XML

if ($index = 23) {{}}

if ($index -eq 23) {{}}

Use -eq.

PowerShell

val x = 'hello'

val x = "hello"

Double quotes.

Kotlin

UPDATE orders SET email='hello' WHERE status=20

UPDATE orders SET email='hello' WHERE status=20;

Add semicolon.

SQL

$values[47]

if ($values.Count -gt 47) {{ $values[47] }}

Check bounds.

PowerShell

cin >> y cout << y;

cin >> y; cout << y;

Add semicolon.

C++

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

Correct.

Python

if data = 99:

if data == 99:

Use == for comparison.

Python

if (a = 76) {{}}

if (a == 76) {{}}

Use ==.

Java

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

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

Throw Error objects.

JavaScript

class Order {{ int count; }} obj.count=5;

class Order {{ public int count; }} obj.count=5;

Make field public.

Java

fn handle() -> i32 {{ 28 }}

Correct.

Rust

let b: number = 'world';

let b: string = 'world';

Fix type.

TypeScript

84temp = 10

temp84 = 10

Variable cannot start with digit.

Python

name: value title: data,

name: value title: data

Remove comma.

YAML

process

process()

Add parentheses.

Swift

print 'value'

print 'value';

Add semicolon.

Perl

if z = 66

if z == 66

Use ==.

MATLAB

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

Correct.

Java

class = 'message'

class_name = 'message'

'class' is a keyword.

Python

let z: Int = 'message'

let z: String = 'message'

Fix type.

Swift

class Child Super:

class Child(Super):

Inheritance uses parentheses.

Python

$items[55] = 5;

if (isset($items[55])) $items[55] = 5;

Check existence.

PHP

p {{ color: blue }}

p {{ color: blue; }}

Add semicolon.

CSS

for c in range(61) print(c)

for c in range(61): print(c)

Colon after for.

Python

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

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

Clone to avoid move.

Rust

if val = 54

if val == 54

Use ==.

MATLAB

Add alt text.

HTML

assert y > 23

Correct.

Python

if (y = 71)

if (y == 71)

Use ==.

R

SELECT * FROM users WHRE name=49;

SELECT * FROM users WHERE name=49;

Fix WHERE.

SQL

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

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

Declare before use.

C++

if ($z = 14) {{}}

if ($z -eq 14) {{}}

Use -eq.

PowerShell

test

test()

Add parentheses.

Swift

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(80);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(80, () => console.log('listening'));

Add callback.

Node.js

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

Correct.

Java

a = world

a = 'world'

Quote strings.

Python

<?php // code ?>

Correct.

PHP

Add rel for security.

HTML

package main func main() {{}}

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

Import needed.

Go

if [ $a = 45 ]; then

if [ "$a" = 45 ]; then

Quote variable.

Shell

[30, 58, 9

[30, 58, 9]

Close bracket.

Python

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

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

Better error handling.

Node.js

if index = 75

if index == 75

Use ==.

Ruby

raise 'world'

raise Exception('world')

Raise needs an exception class.

Python

fn compute() -> i32 {{ 88 }}

Correct.

Rust

my @arr = (9,1,49);

Correct.

Perl

if (c = 29)

if (c == 29)

Use ==.

C++

["test", 87]

Correct.

JSON

// comment

/* comment */

Use /* */.

CSS

val c = 'test'

val c = "test"

Double quotes.

Kotlin

for (num in values)

for (num of values)

for...in iterates keys.

JavaScript

Write-Host 'value'

Correct.

PowerShell

arr[75]

if (length(arr) >= 75) arr[75]

Check length.

R

function handle(): void {{ return 20; }}

function handle(): number {{ return 20; }}

Return type mismatch.

TypeScript

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

Correct.

Python

echo output hello

echo 'output hello'

Quote to prevent splitting.

Shell

let result: number | null = null; result.toFixed(54);

let result: number | null = null; if(result!==null) result.toFixed(54);

Null check.

TypeScript

compute

compute()

Add parentheses.

Kotlin

Close li.

HTML

print('hello')

Correct.

R

let y: i32 = "value";

let y: &str = "value";

Type mismatch.

Rust

list: - item1 - item2

Correct.

YAML

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

const user:Person = {{name:'output', age:65}};

Add missing property.

TypeScript

function test() {{ echo 'hello'; }}

Correct.

PHP

status: output name: hello,

status: output name: hello

Remove comma.

YAML

UPDATE products SET status='message' WHERE status=95

UPDATE products SET status='message' WHERE status=95;

Add semicolon.

SQL

z > 35 & x < 16

z > 35 and x < 16

Use 'and' not '&'.

Python

let y = 32;

Correct.

JavaScript

SELECT id status FROM products;

SELECT id, status FROM products;

Add comma.

SQL

val count: Int = 'info'

val count: String = 'info'

Fix type.

Kotlin

print 'message'

print('message')

print needs parentheses.

Python

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

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

Make field public.

Java

let bar = 'output'

let bar = "output"

Double quotes.

Swift

console.log('info'

console.log('info')

Close parenthesis.

JavaScript

if (b = 37) {{}}

if (b == 37) {{}}

Use ==.

Kotlin

values[81]

if (values.indices.contains(81)) values[81]

Check index.

Kotlin