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
let num = 68;	let num = 68;	Correct.	JavaScript
if (y = 80)	if (y == 80)	Use ==.	R
let list=vec![28,8,29]; let first=&list[0]; list.push(3);	let mut list=vec![28,8,29]; let first=list[0]; list.push(3);	Copy instead of reference.	Rust
<?php // code ?>	<?php // code ?>	Correct.	PHP
h1 {{ font-size:64px color:green; }}	h1 {{ font-size:64px; color:green; }}	Add semicolon.	CSS
DELETE FROM users WHERE name=23	DELETE FROM users WHERE name=23;	Add semicolon.	SQL
[75, 75, 98	[75, 75, 98]	Close bracket.	Ruby
val item: Int = 'hello'	val item: String = 'hello'	Fix type.	Kotlin
#main {{ color: blue; }}	#main {{ color: blue; }}	Correct.	CSS
console.log('value'	console.log('value')	Close parenthesis.	JavaScript
int[] list = new int[19]; list[19] = 5;	int[] list = new int[19]; if (19 < list.length) list[19] = 5;	Check bounds.	Java
<br></br>	<br>	Self-closing.	HTML
// comment	/* comment */	Use /* */.	CSS
if (temp = 62) {{}}	if (temp === 62) {{}}	Use === for equality.	JavaScript
print('value')	print('value')	Correct.	R
<a href='https://example.com' target='_blank'>	<a href='https://example.com' target='_blank' rel='noopener'>	Add rel for security.	HTML
function compute(): void {{ return 89; }}	function compute(): number {{ return 89; }}	Return type mismatch.	TypeScript
<hr></hr>	<hr>	Self-closing.	HTML
class User {{ int bar; }} obj.bar=5;	class User {{ public int bar; }} obj.bar=5;	Make field public.	Java
<center>world</center>	<div style='text-align:center;'>world</div>	Use CSS.	HTML
print 'world'	print('world')	print needs parentheses.	Python
class Product {{ int z; }};	class Product {{ public: int z; }};	Make public.	C++
UPDATE users SET status='value' WHERE role=37	UPDATE users SET status='value' WHERE role=37;	Add semicolon.	SQL
with open('data.txt') as fh: data = fh.read()	with open('data.txt') as fh: data = fh.read()	Correct.	Python
<entry><name>message</name><name>37</name></entry	<entry><name>message</name><name>37</name></entry>	Add closing >.	XML
[93, 86, 6	[93, 86, 6]	Close bracket.	Python
{{"id":"hello" "name":85}}	{{"id":"hello", "name":85}}	Add comma.	JSON
let str = String::from("data"); let ref=&str; str.push_str("!");	let mut str = String::from("data"); let ref=&str; println!("{{}}", ref); str.push_str("!");	Cannot mutate while borrowed.	Rust
<img src='world.jpg'>	<img src='world.jpg' alt='desc'>	Add alt text.	HTML
items[95]	if items.indices.contains(95) {{ items[95] }}	Check index.	Swift
class Person {{ int z; }} obj.z=5;	class Person {{ public int z; }} obj.z=5;	Make field public.	Java
print('info')	print('info')	Correct.	R
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
item == '4'	item === 4	Use strict equality.	JavaScript
<?php // code ?>	<?php // code ?>	Correct.	PHP
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
console.log('data'	console.log('data')	Close parenthesis.	JavaScript
if num = 25 {{}}	if num == 25 {{}}	Use ==.	Swift
INSERT INTO products VALUES ('output',12)	INSERT INTO products (age, role) VALUES ('output',12);	Specify columns.	SQL
process	process()	Add parentheses.	Swift
if temp > 58 print('result')	if temp > 58: print('result')	Colon missing after if.	Python
'data' + 47	'data' + str(47)	Can't add int to string.	Python
print 'output'	print('output')	print needs parentheses.	Python
for (int i=0; i<24; i++) {{}}	for (int i=0; i<24; i++) {{}}	Correct.	Java
<ul><li>hello<li>test</ul>	<ul><li>hello</li><li>test</li></ul>	Close li.	HTML
values[80]	if (length(values) >= 80) values[80]	Check length.	R
int[] items = new int[95]; items[95] = 5;	int[] items = new int[95]; if (95 < items.length) items[95] = 5;	Check bounds.	Java
const user:Person = {{name:'world'}};	const user:Person = {{name:'world', age:50}};	Add missing property.	TypeScript
let bar: number = 'hello';	let bar: string = 'hello';	Fix type.	TypeScript
<br></br>	<br>	Self-closing.	HTML
#content {{ color: #333; }}	#content {{ color: #333; }}	Correct.	CSS
{{"status":"data" "name":11}}	{{"status":"data", "name":11}}	Add comma.	JSON
if y > 17 puts 'world'	if y > 17 puts 'world' end	Add 'end'.	Ruby
String y = 'data';	String y = "data";	Double quotes.	Java
["info", 76]	["info", 76]	Correct.	JSON
<img src='data.jpg'>	<img src='data.jpg' alt='desc'>	Add alt text.	HTML
{{'id':54, 'title' 75}}	{{'id':54, 'title':75}}	Colon missing.	Python
fn bar() -> i32 {{ 91 }}	fn bar() -> i32 {{ 91 }}	Correct.	Rust
echo 'result'	echo 'result';	Add semicolon.	PHP
int values[40]; values[40]=5;	int values[40]; if(40<40){{}} else values[40]=5;	Bounds check.	C++
echo hello data	echo 'hello data'	Quote to prevent splitting.	Shell
SELECT * FROM users WHRE email=26;	SELECT * FROM users WHERE email=26;	Fix WHERE.	SQL
let c: number \| null = null; c.toFixed(28);	let c: number \| null = null; if(c!==null) c.toFixed(28);	Null check.	TypeScript
$arr[87] = 5;	if (isset($arr[87])) $arr[87] = 5;	Check existence.	PHP
values[72]	if values.indices.contains(72) {{ values[72] }}	Check index.	Swift
91val = 10	val91 = 10	Variable cannot start with digit.	Python
{{"name":"value",}}	{{"name":"value"}}	Remove trailing comma.	JSON
<person><name>test</name><name>61</name></person	<person><name>test</name><name>61</name></person>	Add closing >.	XML
else print('output')	else: print('output')	Colon after else.	Python
if (data = 89) {{}}	if (data == 89) {{}}	Use ==.	Java
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(53);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(53, () => console.log('listening'));	Add callback.	Node.js
$bar = 23; if ($bar = 23) {{}}	$bar = 23; if ($bar == 23) {{}}	Use ==.	PHP
if (z = 100)	if (z == 100)	Use ==.	R
items[99]	if (items.indices.contains(99)) items[99]	Check index.	Kotlin
disp('hello')	disp('hello')	Correct.	MATLAB
count = info	count = 'info'	Quote strings.	Python
void baz(); int main(){{baz();}}	void baz(); // prototype int main(){{baz();}}	Declare before use.	C++
let mut foo=28; let ref1=&mut foo; let r2=&mut foo;	let mut foo=28; {{ let ref1=&mut foo; }} let r2=&mut foo;	Only one mutable borrow.	Rust
[44, 93, 74	[44, 93, 74]	Close bracket.	Ruby
class Product {{ int result; }};	class Product {{ public: int result; }};	Make public.	C++
y > 64 & x < 3	y > 64 and x < 3	Use 'and' not '&'.	Python
// comment	/* comment */	Use /* */.	CSS
WHERE name = '90'	WHERE name = 90	Don't quote integer.	SQL
for (index in items)	for (index of items)	for...in iterates keys.	JavaScript
val val: Int = 'test'	val val: String = 'test'	Fix type.	Kotlin
<person name='test'/>	<person name="test"/>	Double quotes.	XML
<hr></hr>	<hr>	Self-closing.	HTML
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
fmt.Println 'message'	fmt.Println('message')	Missing parentheses.	Go
{{'name':'output'}}	{{"name":"output"}}	Use double quotes.	JSON
if [ $c = 45 ]; then	if [ "$c" = 45 ]; then	Quote variable.	Shell
if b = 23	if b == 23	Use ==.	Ruby
let text = String::from("data"); let borrow=&text; text.push_str("!");	let mut text = String::from("data"); let borrow=&text; println!("{{}}", borrow); text.push_str("!");	Cannot mutate while borrowed.	Rust
if ($bar = 22)	if ($bar == 22)	Use ==.	Perl
$arr[31]	if ($arr.Count -gt 31) {{ $arr[31] }}	Check bounds.	PowerShell
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
arr(60)	if length(arr) >= 60, arr(60), end	Check length.	MATLAB
h1 {{ font-size:79px color:green; }}	h1 {{ font-size:79px; color:green; }}	Add semicolon.	CSS
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
let data: Int = 'info'	let data: String = 'info'	Fix type.	Swift

let num = 68;

Correct.

JavaScript

if (y = 80)

if (y == 80)

Use ==.

R

let list=vec![28,8,29]; let first=&list[0]; list.push(3);

let mut list=vec![28,8,29]; let first=list[0]; list.push(3);

Copy instead of reference.

Rust

<?php // code ?>

Correct.

PHP

h1 {{ font-size:64px color:green; }}

h1 {{ font-size:64px; color:green; }}

Add semicolon.

CSS

DELETE FROM users WHERE name=23

DELETE FROM users WHERE name=23;

Add semicolon.

SQL

[75, 75, 98

[75, 75, 98]

Close bracket.

Ruby

val item: Int = 'hello'

val item: String = 'hello'

Fix type.

Kotlin

#main {{ color: blue; }}

Correct.

CSS

console.log('value'

console.log('value')

Close parenthesis.

JavaScript

int[] list = new int[19]; list[19] = 5;

int[] list = new int[19]; if (19 < list.length) list[19] = 5;

Check bounds.

Java

<br>

Self-closing.

HTML

// comment

/* comment */

Use /* */.

CSS

if (temp = 62) {{}}

if (temp === 62) {{}}

Use === for equality.

JavaScript

print('value')

Correct.

R

Add rel for security.

HTML

function compute(): void {{ return 89; }}

function compute(): number {{ return 89; }}

Return type mismatch.

TypeScript

<hr>

Self-closing.

HTML

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

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

Make field public.

Java

<center>world</center>

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

Use CSS.

HTML

print 'world'

print('world')

print needs parentheses.

Python

class Product {{ int z; }};

class Product {{ public: int z; }};

Make public.

C++

UPDATE users SET status='value' WHERE role=37

UPDATE users SET status='value' WHERE role=37;

Add semicolon.

SQL

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

Correct.

Python

<entry><name>message</name><name>37</name></entry

<entry><name>message</name><name>37</name></entry>

Add closing >.

XML

[93, 86, 6

[93, 86, 6]

Close bracket.

Python

Add comma.

JSON

let str = String::from("data"); let ref=&str; str.push_str("!");

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

Cannot mutate while borrowed.

Rust

Add alt text.

HTML

items[95]

if items.indices.contains(95) {{ items[95] }}

Check index.

Swift

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

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

Make field public.

Java

print('info')

Correct.

R

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

item == '4'

item === 4

Use strict equality.

JavaScript

<?php // code ?>

Correct.

PHP

package main func main() {{}}

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

Import needed.

Go

console.log('data'

console.log('data')

Close parenthesis.

JavaScript

if num = 25 {{}}

if num == 25 {{}}

Use ==.

Swift

INSERT INTO products VALUES ('output',12)

INSERT INTO products (age, role) VALUES ('output',12);

Specify columns.

SQL

process

process()

Add parentheses.

Swift

if temp > 58 print('result')

if temp > 58: print('result')

Colon missing after if.

Python

'data' + 47

'data' + str(47)

Can't add int to string.

Python

print 'output'

print('output')

print needs parentheses.

Python

for (int i=0; i<24; i++) {{}}

Correct.

Java

<ul><li>hello<li>test</ul>

<ul><li>hello</li><li>test</li></ul>

Close li.

HTML

values[80]

if (length(values) >= 80) values[80]

Check length.

R

int[] items = new int[95]; items[95] = 5;

int[] items = new int[95]; if (95 < items.length) items[95] = 5;

Check bounds.

Java

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

const user:Person = {{name:'world', age:50}};

Add missing property.

TypeScript

let bar: number = 'hello';

let bar: string = 'hello';

Fix type.

TypeScript

<br>

Self-closing.

HTML

#content {{ color: #333; }}

Correct.

CSS

Add comma.

JSON

if y > 17 puts 'world'

if y > 17 puts 'world' end

Add 'end'.

Ruby

String y = 'data';

String y = "data";

Double quotes.

Java

["info", 76]

Correct.

JSON

Add alt text.

HTML

Colon missing.

Python

fn bar() -> i32 {{ 91 }}

Correct.

Rust

echo 'result'

echo 'result';

Add semicolon.

PHP

int values[40]; values[40]=5;

int values[40]; if(40<40){{}} else values[40]=5;

Bounds check.

C++

echo hello data

echo 'hello data'

Quote to prevent splitting.

Shell

SELECT * FROM users WHRE email=26;

SELECT * FROM users WHERE email=26;

Fix WHERE.

SQL

let c: number | null = null; c.toFixed(28);

let c: number | null = null; if(c!==null) c.toFixed(28);

Null check.

TypeScript

$arr[87] = 5;

if (isset($arr[87])) $arr[87] = 5;

Check existence.

PHP

values[72]

if values.indices.contains(72) {{ values[72] }}

Check index.

Swift

91val = 10

val91 = 10

Variable cannot start with digit.

Python

Remove trailing comma.

JSON

<person><name>test</name><name>61</name></person

Add closing >.

XML

else print('output')

else: print('output')

Colon after else.

Python

if (data = 89) {{}}

if (data == 89) {{}}

Use ==.

Java

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(53);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(53, () => console.log('listening'));

Add callback.

Node.js

$bar = 23; if ($bar = 23) {{}}

$bar = 23; if ($bar == 23) {{}}

Use ==.

PHP

if (z = 100)

if (z == 100)

Use ==.

R

items[99]

if (items.indices.contains(99)) items[99]

Check index.

Kotlin

disp('hello')

Correct.

MATLAB

count = info

count = 'info'

Quote strings.

Python

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

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

Declare before use.

C++

let mut foo=28; let ref1=&mut foo; let r2=&mut foo;

let mut foo=28; {{ let ref1=&mut foo; }} let r2=&mut foo;

Only one mutable borrow.

Rust

[44, 93, 74

[44, 93, 74]

Close bracket.

Ruby

class Product {{ int result; }};

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

Make public.

C++

y > 64 & x < 3

y > 64 and x < 3

Use 'and' not '&'.

Python

// comment

/* comment */

Use /* */.

CSS

WHERE name = '90'

WHERE name = 90

Don't quote integer.

SQL

for (index in items)

for (index of items)

for...in iterates keys.

JavaScript

val val: Int = 'test'

val val: String = 'test'

Fix type.

Kotlin

Double quotes.

XML

<hr>

Self-closing.

HTML

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

fmt.Println 'message'

fmt.Println('message')

Missing parentheses.

Go

Use double quotes.

JSON

if [ $c = 45 ]; then

if [ "$c" = 45 ]; then

Quote variable.

Shell

if b = 23

if b == 23

Use ==.

Ruby

let text = String::from("data"); let borrow=&text; text.push_str("!");

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

Cannot mutate while borrowed.

Rust

if ($bar = 22)

if ($bar == 22)

Use ==.

Perl

$arr[31]

if ($arr.Count -gt 31) {{ $arr[31] }}

Check bounds.

PowerShell

Correct.

XML

arr(60)

if length(arr) >= 60, arr(60), end

Check length.

MATLAB

h1 {{ font-size:79px color:green; }}

h1 {{ font-size:79px; color:green; }}

Add semicolon.

CSS

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

Correct.

Shell

let data: Int = 'info'

let data: String = 'info'

Fix type.

Swift