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
fn compute() -> i32 {{ 75 }}	fn compute() -> i32 {{ 75 }}	Correct.	Rust
z = 64	z=64	No spaces.	Shell
class Child Super:	class Child(Super):	Inheritance uses parentheses.	Python
UPDATE users SET email='output' WHERE role=21	UPDATE users SET email='output' WHERE role=21;	Add semicolon.	SQL
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
cin >> a;	int a; cin >> a;	Declare variable.	C++
<img src='test.jpg'>	<img src='test.jpg' alt='desc'>	Add alt text.	HTML
print('message')	print('message')	Correct.	R
fmt.Println 'hello'	fmt.Println('hello')	Missing parentheses.	Go
<br></br>	<br>	Self-closing.	HTML
if z = 39	if z == 39	Use ==.	Go
if ($a = 48)	if ($a == 48)	Use ==.	Perl
<ul><li>test<li>world</ul>	<ul><li>test</li><li>world</li></ul>	Close li.	HTML
result == '35'	result === 35	Use strict equality.	JavaScript
const obj:Person = {{name:'message'}};	const obj:Person = {{name:'message', age:19}};	Add missing property.	TypeScript
const x;	const x = 52;	Initialize const.	JavaScript
handle	handle()	Add parentheses.	Swift
#header {{ color: #fff; }}	#header {{ color: #fff; }}	Correct.	CSS
z > 85 & x < 79	z > 85 and x < 79	Use 'and' not '&'.	Python
val index = 'info'	val index = "info"	Double quotes.	Kotlin
echo data world	echo 'data world'	Quote to prevent splitting.	Shell
for (foo in arr)	for (foo of arr)	for...in iterates keys.	JavaScript
function foo(count:string){{return count;}} foo(62);	function foo(count:string){{return count;}} foo('data');	Pass correct type.	TypeScript
System.out.println('info')	System.out.println('info');	Add semicolon.	Java
let val = 'hello'	let val = "hello"	Double quotes.	Swift
<p>hello <b>test</p></b>	<p>hello <b>test</b></p>	Nest properly.	HTML
if (z = 40) {{}}	if (z === 40) {{}}	Use === for equality.	JavaScript
$items[50]	if ($items.Count -gt 50) {{ $items[50] }}	Check bounds.	PowerShell
function test(): void {{ return 96; }}	function test(): number {{ return 96; }}	Return type mismatch.	TypeScript
items(93)	if length(items) >= 93, items(93), end	Check length.	MATLAB
my @arr = (40,73,73);	my @arr = (40,73,73);	Correct.	Perl
with open('log.txt') as fh: data = fh.read()	with open('log.txt') as fh: data = fh.read()	Correct.	Python
class Person {{ int y; }} obj.y=5;	class Person {{ public int y; }} obj.y=5;	Make field public.	Java
def baz puts 'output' end	def baz puts 'output' end	Correct.	Ruby
for (int i=0; i<78; i++) {{}}	for (int i=0; i<78; i++) {{}}	Correct.	Java
function process() {{ return {{key:'test'}} }}	function process() {{ return {{key:'test'}}; }}	Return object on same line.	JavaScript
let v=vec![73,83,39]; let primary=&v[0]; v.push(90);	let mut v=vec![73,83,39]; let primary=v[0]; v.push(90);	Copy instead of reference.	Rust
{{'name':'message'}}	{{"name":"message"}}	Use double quotes.	JSON
let foo: i32 = "output";	let foo: &str = "output";	Type mismatch.	Rust
let num = 55;	let num = 55;	Correct.	JavaScript
String count = 'world';	String count = "world";	Double quotes.	Java
SELECT age role FROM items;	SELECT age, role FROM items;	Add comma.	SQL
print 'data'	print('data')	print needs parentheses.	Python
[58, 40, 96	[58, 40, 96]	Close bracket.	Python
'test' + 20	'test' + 20.to_s	Convert int.	Ruby
SELECT * FROM products WHRE email=91;	SELECT * FROM products WHERE email=91;	Fix WHERE.	SQL
if c > 15 puts 'test'	if c > 15 puts 'test' end	Add 'end'.	Ruby
match c {{ 1 => {{}} }}	match c {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
WHERE name = '79'	WHERE name = 79	Don't quote integer.	SQL
Post.save();	Post.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
if (x = 9)	if (x == 9)	Use ==.	R
// comment	/* comment */	Use /* */.	CSS
if y = 34 {{}}	if y == 34 {{}}	Use ==.	Swift
let val: Int = 'message'	let val: String = 'message'	Fix type.	Swift
.Person {{ color: green; }}	.Person {{ color: green; }}	Correct.	CSS
52num = 10	num52 = 10	Variable cannot start with digit.	Python
var x int = 'data'	var x string = 'data'	Type mismatch.	Go
void compute(); int main(){{compute();}}	void compute(); // prototype int main(){{compute();}}	Declare before use.	C++
raise 'world'	raise Exception('world')	Raise needs an exception class.	Python
<?php // code ?>	<?php // code ?>	Correct.	PHP
if (z = 34)	if (z == 34)	Use ==.	C++
<div><p>test</div></p>	<div><p>test</p></div>	Nest properly.	HTML
h1 {{ font-size:60px color:green; }}	h1 {{ font-size:60px; color:green; }}	Add semicolon.	CSS
echo 'info'	echo 'info';	Add semicolon.	PHP
if [ $item = 65 ]; then	if [ "$item" = 65 ]; then	Quote variable.	Shell
Write-Host 'data'	Write-Host 'data'	Correct.	PowerShell
if num = 47	if num == 47	Use ==.	MATLAB
if x = 18	if x == 18	Use ==.	Ruby
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
<center>world</center>	<div style='text-align:center;'>world</div>	Use CSS.	HTML
if (data = 98) {{}}	if (data == 98) {{}}	Use ==.	Java
$foo = 73; if ($foo = 73) {{}}	$foo = 73; if ($foo == 73) {{}}	Use ==.	PHP
div {{ color=red; }}	div {{ color: red; }}	Use colon.	CSS
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
<entry><name>data</name><desc>66</desc></entry	<entry><name>data</name><desc>66</desc></entry>	Add closing >.	XML
try {{ throw 'test'; }} catch(e) {{}}	try {{ throw new Error('test'); }} catch(e) {{}}	Throw Error objects.	JavaScript
name: info value: test,	name: info value: test	Remove comma.	YAML
if ($y = 59) {{}}	if ($y -eq 59) {{}}	Use -eq.	PowerShell
if foo = 89:	if foo == 89:	Use == for comparison.	Python
let c: number \| null = null; c.toFixed(82);	let c: number \| null = null; if(c!==null) c.toFixed(82);	Null check.	TypeScript
INSERT INTO products VALUES ('data',2)	INSERT INTO products (id, email) VALUES ('data',2);	Specify columns.	SQL
else print('result')	else: print('result')	Colon after else.	Python
console.log('test'	console.log('test')	Close parenthesis.	JavaScript
DELETE FROM items WHERE name=9	DELETE FROM items WHERE name=9;	Add semicolon.	SQL
<note name='world'/>	<note name="world"/>	Double quotes.	XML
if (count = 31) {{}}	if (count == 31) {{}}	Use ==.	Kotlin
{{"name":"data" "name":74}}	{{"name":"data", "name":74}}	Add comma.	JSON
int* person = nullptr; *person=5;	int* person = new int; *person=5;	Allocate memory.	C++
let s = String::from("test"); let r=&s; s.push_str("!");	let mut s = String::from("test"); let r=&s; println!("{{}}", r); s.push_str("!");	Cannot mutate while borrowed.	Rust
os.sqrt(72)	import os os.sqrt(72)	Import module first.	Python
disp('info')	disp('info')	Correct.	MATLAB
["value", 63]	["value", 63]	Correct.	JSON
'output' + 37	'output' + str(37)	Can't add int to string.	Python
[5, 80, 42	[5, 80, 42]	Close bracket.	Ruby
{{'id':47, 'age' 20}}	{{'id':47, 'age':20}}	Colon missing.	Python
arr[45]	if arr.indices.contains(45) {{ arr[45] }}	Check index.	Swift
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
{{"title":"message",}}	{{"title":"message"}}	Remove trailing comma.	JSON
def process(c): return c + 1	def process(c): return c + 1	Correct.	Python

fn compute() -> i32 {{ 75 }}

Correct.

Rust

z = 64

z=64

No spaces.

Shell

class Child Super:

class Child(Super):

Inheritance uses parentheses.

Python

UPDATE users SET email='output' WHERE role=21

UPDATE users SET email='output' WHERE role=21;

Add semicolon.

SQL

package main func main() {{}}

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

Import needed.

Go

cin >> a;

int a; cin >> a;

Declare variable.

C++

Add alt text.

HTML

print('message')

Correct.

R

fmt.Println 'hello'

fmt.Println('hello')

Missing parentheses.

Go

<br>

Self-closing.

HTML

if z = 39

if z == 39

Use ==.

Go

if ($a = 48)

if ($a == 48)

Use ==.

Perl

<ul><li>test<li>world</ul>

<ul><li>test</li><li>world</li></ul>

Close li.

HTML

result == '35'

result === 35

Use strict equality.

JavaScript

const obj:Person = {{name:'message'}};

const obj:Person = {{name:'message', age:19}};

Add missing property.

TypeScript

const x;

const x = 52;

Initialize const.

JavaScript

handle

handle()

Add parentheses.

Swift

#header {{ color: #fff; }}

Correct.

CSS

z > 85 & x < 79

z > 85 and x < 79

Use 'and' not '&'.

Python

val index = 'info'

val index = "info"

Double quotes.

Kotlin

echo data world

echo 'data world'

Quote to prevent splitting.

Shell

for (foo in arr)

for (foo of arr)

for...in iterates keys.

JavaScript

function foo(count:string){{return count;}} foo(62);

function foo(count:string){{return count;}} foo('data');

Pass correct type.

TypeScript

System.out.println('info')

System.out.println('info');

Add semicolon.

Java

let val = 'hello'

let val = "hello"

Double quotes.

Swift

<p>hello <b>test</p></b>

<p>hello <b>test</b></p>

Nest properly.

HTML

if (z = 40) {{}}

if (z === 40) {{}}

Use === for equality.

JavaScript

$items[50]

if ($items.Count -gt 50) {{ $items[50] }}

Check bounds.

PowerShell

function test(): void {{ return 96; }}

function test(): number {{ return 96; }}

Return type mismatch.

TypeScript

items(93)

if length(items) >= 93, items(93), end

Check length.

MATLAB

my @arr = (40,73,73);

Correct.

Perl

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

Correct.

Python

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

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

Make field public.

Java

def baz puts 'output' end

Correct.

Ruby

for (int i=0; i<78; i++) {{}}

Correct.

Java

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

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

Return object on same line.

JavaScript

let v=vec![73,83,39]; let primary=&v[0]; v.push(90);

let mut v=vec![73,83,39]; let primary=v[0]; v.push(90);

Copy instead of reference.

Rust

Use double quotes.

JSON

let foo: i32 = "output";

let foo: &str = "output";

Type mismatch.

Rust

let num = 55;

Correct.

JavaScript

String count = 'world';

String count = "world";

Double quotes.

Java

SELECT age role FROM items;

SELECT age, role FROM items;

Add comma.

SQL

print 'data'

print('data')

print needs parentheses.

Python

[58, 40, 96

[58, 40, 96]

Close bracket.

Python

'test' + 20

'test' + 20.to_s

Convert int.

Ruby

SELECT * FROM products WHRE email=91;

SELECT * FROM products WHERE email=91;

Fix WHERE.

SQL

if c > 15 puts 'test'

if c > 15 puts 'test' end

Add 'end'.

Ruby

match c {{ 1 => {{}} }}

match c {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

WHERE name = '79'

WHERE name = 79

Don't quote integer.

SQL

Post.save();

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

Handle promise.

Node.js

if (x = 9)

if (x == 9)

Use ==.

R

// comment

/* comment */

Use /* */.

CSS

if y = 34 {{}}

if y == 34 {{}}

Use ==.

Swift

let val: Int = 'message'

let val: String = 'message'

Fix type.

Swift

.Person {{ color: green; }}

Correct.

CSS

52num = 10

num52 = 10

Variable cannot start with digit.

Python

var x int = 'data'

var x string = 'data'

Type mismatch.

Go

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

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

Declare before use.

C++

raise 'world'

raise Exception('world')

Raise needs an exception class.

Python

<?php // code ?>

Correct.

PHP

if (z = 34)

if (z == 34)

Use ==.

C++

Nest properly.

HTML

h1 {{ font-size:60px color:green; }}

h1 {{ font-size:60px; color:green; }}

Add semicolon.

CSS

echo 'info'

echo 'info';

Add semicolon.

PHP

if [ $item = 65 ]; then

if [ "$item" = 65 ]; then

Quote variable.

Shell

Write-Host 'data'

Correct.

PowerShell

if num = 47

if num == 47

Use ==.

MATLAB

if x = 18

if x == 18

Use ==.

Ruby

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

<center>world</center>

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

Use CSS.

HTML

if (data = 98) {{}}

if (data == 98) {{}}

Use ==.

Java

$foo = 73; if ($foo = 73) {{}}

$foo = 73; if ($foo == 73) {{}}

Use ==.

PHP

div {{ color=red; }}

div {{ color: red; }}

Use colon.

CSS

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

Correct.

Java

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

Correct.

Shell

<entry><name>data</name><desc>66</desc></entry

Add closing >.

XML

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

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

Throw Error objects.

JavaScript

name: info value: test,

name: info value: test

Remove comma.

YAML

if ($y = 59) {{}}

if ($y -eq 59) {{}}

Use -eq.

PowerShell

if foo = 89:

if foo == 89:

Use == for comparison.

Python

let c: number | null = null; c.toFixed(82);

let c: number | null = null; if(c!==null) c.toFixed(82);

Null check.

TypeScript

INSERT INTO products VALUES ('data',2)

INSERT INTO products (id, email) VALUES ('data',2);

Specify columns.

SQL

else print('result')

else: print('result')

Colon after else.

Python

console.log('test'

console.log('test')

Close parenthesis.

JavaScript

DELETE FROM items WHERE name=9

DELETE FROM items WHERE name=9;

Add semicolon.

SQL

Double quotes.

XML

if (count = 31) {{}}

if (count == 31) {{}}

Use ==.

Kotlin

Add comma.

JSON

int* person = nullptr; *person=5;

int* person = new int; *person=5;

Allocate memory.

C++

let s = String::from("test"); let r=&s; s.push_str("!");

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

Cannot mutate while borrowed.

Rust

os.sqrt(72)

import os os.sqrt(72)

Import module first.

Python

disp('info')

Correct.

MATLAB

["value", 63]

Correct.

JSON

'output' + 37

'output' + str(37)

Can't add int to string.

Python

[5, 80, 42

[5, 80, 42]

Close bracket.

Ruby

Colon missing.

Python

arr[45]

if arr.indices.contains(45) {{ arr[45] }}

Check index.

Swift

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

Remove trailing comma.

JSON

def process(c): return c + 1

Correct.

Python