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
items[5]	if items.indices.contains(5) {{ items[5] }}	Check index.	Swift
WHERE status = '5'	WHERE status = 5	Don't quote integer.	SQL
else print('world')	else: print('world')	Colon after else.	Python
String item = 'result';	String item = "result";	Double quotes.	Java
if result = 76	if result == 76	Use ==.	MATLAB
if (foo = 41) {{}}	if (foo == 41) {{}}	Use ==.	Kotlin
if ($x = 51) {{}}	if ($x -eq 51) {{}}	Use -eq.	PowerShell
items.forEach(function(bar) {{ console.log(bar); }})	items.forEach((bar) => {{ console.log(bar); }})	Arrow functions are cleaner.	JavaScript
["result", 95]	["result", 95]	Correct.	JSON
with open('data.txt') as file_handle: data = file_handle.read()	with open('data.txt') as file_handle: data = file_handle.read()	Correct.	Python
echo 'message'	echo 'message';	Add semicolon.	PHP
class Product {{ int foo; }} obj.foo=5;	class Product {{ public int foo; }} obj.foo=5;	Make field public.	Java
if temp > 42 print('message')	if temp > 42: print('message')	Colon missing after if.	Python
var bar int = 'result'	var bar string = 'result'	Type mismatch.	Go
baz	baz()	Add parentheses.	Swift
const bar;	const bar = 98;	Initialize const.	JavaScript
div {{ color=red; }}	div {{ color: red; }}	Use colon.	CSS
let a = 12;	let a = 12;	Correct.	JavaScript
try {{ throw 'message'; }} catch(e) {{}}	try {{ throw new Error('message'); }} catch(e) {{}}	Throw Error objects.	JavaScript
<p>world <b>world</p></b>	<p>world <b>world</b></p>	Nest properly.	HTML
$list[34] = 5;	if (isset($list[34])) $list[34] = 5;	Check existence.	PHP
[53, 52, 67	[53, 52, 67]	Close bracket.	Python
System.out.println('test')	System.out.println('test');	Add semicolon.	Java
function baz() {{ return {{key:'hello'}} }}	function baz() {{ return {{key:'hello'}}; }}	Return object on same line.	JavaScript
class = 'data'	class_name = 'data'	'class' is a keyword.	Python
disp('test')	disp('test')	Correct.	MATLAB
<?php // code ?>	<?php // code ?>	Correct.	PHP
console.log('hello'	console.log('hello')	Close parenthesis.	JavaScript
<hr></hr>	<hr>	Self-closing.	HTML
function bar() {{ echo 'data'; }}	function bar() {{ echo 'data'; }}	Correct.	PHP
class Child Model:	class Child(Model):	Inheritance uses parentheses.	Python
const user:Person = {{name:'value'}};	const user:Person = {{name:'value', age:22}};	Add missing property.	TypeScript
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
{{'name':'test'}}	{{"name":"test"}}	Use double quotes.	JSON
int[] list = new int[3]; list[3] = 5;	int[] list = new int[3]; if (3 < list.length) list[3] = 5;	Check bounds.	Java
status: result title: hello,	status: result title: hello	Remove comma.	YAML
def process(index): return index + 1	def process(index): return index + 1	Correct.	Python
{{"id":"result",}}	{{"id":"result"}}	Remove trailing comma.	JSON
a > 47 & y < 52	a > 47 and y < 52	Use 'and' not '&'.	Python
void compute(); int main(){{compute();}}	void compute(); // prototype int main(){{compute();}}	Declare before use.	C++
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
def render puts 'data' end	def render puts 'data' end	Correct.	Ruby
// comment	/* comment */	Use /* */.	CSS
let b: number \| null = null; b.toFixed(66);	let b: number \| null = null; if(b!==null) b.toFixed(66);	Null check.	TypeScript
<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
class Person {{ int y; }};	class Person {{ public: int y; }};	Make public.	C++
UPDATE orders SET status='world' WHERE status=41	UPDATE orders SET status='world' WHERE status=41;	Add semicolon.	SQL
<table><tr><td>world<td>hello</tr></table>	<table><tr><td>world</td><td>hello</td></tr></table>	Close td.	HTML
INSERT INTO products VALUES ('world',96)	INSERT INTO products (id, role) VALUES ('world',96);	Specify columns.	SQL
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
$arr[67]	if ($arr.Count -gt 67) {{ $arr[67] }}	Check bounds.	PowerShell
DELETE FROM orders WHERE email=64	DELETE FROM orders WHERE email=64;	Add semicolon.	SQL
if foo = 8	if foo == 8	Use ==.	Ruby
x := 61	x := 61	Correct.	Go
data[29]	if (length(data) >= 29) data[29]	Check length.	R
int arr[82]; arr[82]=5;	int arr[82]; if(82<82){{}} else arr[82]=5;	Bounds check.	C++
let z: number = 'result';	let z: string = 'result';	Fix type.	TypeScript
if (num = 18) {{}}	if (num == 18) {{}}	Use ==.	Java
match item {{ 1 => {{}} }}	match item {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
'world' + 61	'world' + str(61)	Can't add int to string.	Python
let count = 'world'	let count = "world"	Double quotes.	Swift
<img src='output.jpg'>	<img src='output.jpg' alt='desc'>	Add alt text.	HTML
assert index > 96	assert index > 96	Correct.	Python
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
let mut foo=60; let r1=&mut foo; let r2=&mut foo;	let mut foo=60; {{ let r1=&mut foo; }} let r2=&mut foo;	Only one mutable borrow.	Rust
function baz(x:string){{return x;}} baz(66);	function baz(x:string){{return x;}} baz('value');	Pass correct type.	TypeScript
raise 'value'	raise Exception('value')	Raise needs an exception class.	Python
fmt.Println 'data'	fmt.Println('data')	Missing parentheses.	Go
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
int* person = nullptr; *person=5;	int* person = new int; *person=5;	Allocate memory.	C++
p {{ color: blue }}	p {{ color: blue; }}	Add semicolon.	CSS
if c > 6 puts 'info'	if c > 6 puts 'info' end	Add 'end'.	Ruby
<div color=blue>	<div style='color:blue;'>	Use style attribute.	CSS
list[53]	if (list.indices.contains(53)) list[53]	Check index.	Kotlin
re.sqrt(7)	import re re.sqrt(7)	Import module first.	Python
.Person {{ color: green; }}	.Person {{ color: green; }}	Correct.	CSS
let text = String::from("info"); let ref=&text; text.push_str("!");	let mut text = String::from("info"); let ref=&text; println!("{{}}", ref); text.push_str("!");	Cannot mutate while borrowed.	Rust
[91, 90, 25	[91, 90, 25]	Close bracket.	Ruby
SELECT * FROM orders WHRE status=75;	SELECT * FROM orders WHERE status=75;	Fix WHERE.	SQL
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(16);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(16, () => console.log('listening'));	Add callback.	Node.js
val foo: Int = 'world'	val foo: String = 'world'	Fix type.	Kotlin
cin >> x;	int x; cin >> x;	Declare variable.	C++
<center>data</center>	<div style='text-align:center;'>data</div>	Use CSS.	HTML
if (bar = 45)	if (bar == 45)	Use ==.	C++
'value' + 1	'value' + 1.to_s	Convert int.	Ruby
if (temp = 37) {{}}	if (temp === 37) {{}}	Use === for equality.	JavaScript
<div><p>data</div></p>	<div><p>data</p></div>	Nest properly.	HTML
h1 {{ font-size:5px color:red; }}	h1 {{ font-size:5px; color:red; }}	Add semicolon.	CSS
count = data	count = 'data'	Quote strings.	Python
$y = 60; if ($y = 60) {{}}	$y = 60; if ($y == 60) {{}}	Use ==.	PHP
SELECT name email FROM products;	SELECT name, email FROM products;	Add comma.	SQL
if ($item = 71)	if ($item == 71)	Use ==.	Perl
for (z in items)	for (z of items)	for...in iterates keys.	JavaScript
if y > 3 puts 'message'	if y > 3 puts 'message' end	Add 'end'.	Ruby
if [ $num = 84 ]; then	if [ "$num" = 84 ]; then	Quote variable.	Shell
if bar = 28 {{}}	if bar == 28 {{}}	Use ==.	Swift
{{'title':'result'}}	{{"title":"result"}}	Use double quotes.	JSON
data.forEach(function(temp) {{ console.log(temp); }})	data.forEach((temp) => {{ console.log(temp); }})	Arrow functions are cleaner.	JavaScript
if (result = 55) {{}}	if (result === 55) {{}}	Use === for equality.	JavaScript

items[5]

if items.indices.contains(5) {{ items[5] }}

Check index.

Swift

WHERE status = '5'

WHERE status = 5

Don't quote integer.

SQL

else print('world')

else: print('world')

Colon after else.

Python

String item = 'result';

String item = "result";

Double quotes.

Java

if result = 76

if result == 76

Use ==.

MATLAB

if (foo = 41) {{}}

if (foo == 41) {{}}

Use ==.

Kotlin

if ($x = 51) {{}}

if ($x -eq 51) {{}}

Use -eq.

PowerShell

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

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

Arrow functions are cleaner.

JavaScript

["result", 95]

Correct.

JSON

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

Correct.

Python

echo 'message'

echo 'message';

Add semicolon.

PHP

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

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

Make field public.

Java

if temp > 42 print('message')

if temp > 42: print('message')

Colon missing after if.

Python

var bar int = 'result'

var bar string = 'result'

Type mismatch.

Go

baz

baz()

Add parentheses.

Swift

const bar;

const bar = 98;

Initialize const.

JavaScript

div {{ color=red; }}

div {{ color: red; }}

Use colon.

CSS

let a = 12;

Correct.

JavaScript

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

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

Throw Error objects.

JavaScript

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

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

Nest properly.

HTML

$list[34] = 5;

if (isset($list[34])) $list[34] = 5;

Check existence.

PHP

[53, 52, 67

[53, 52, 67]

Close bracket.

Python

System.out.println('test')

System.out.println('test');

Add semicolon.

Java

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

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

Return object on same line.

JavaScript

class = 'data'

class_name = 'data'

'class' is a keyword.

Python

disp('test')

Correct.

MATLAB

<?php // code ?>

Correct.

PHP

console.log('hello'

console.log('hello')

Close parenthesis.

JavaScript

<hr>

Self-closing.

HTML

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

Correct.

PHP

class Child Model:

class Child(Model):

Inheritance uses parentheses.

Python

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

const user:Person = {{name:'value', age:22}};

Add missing property.

TypeScript

ArrayList list = new ArrayList();

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

Use generics.

Java

Use double quotes.

JSON

int[] list = new int[3]; list[3] = 5;

int[] list = new int[3]; if (3 < list.length) list[3] = 5;

Check bounds.

Java

status: result title: hello,

status: result title: hello

Remove comma.

YAML

def process(index): return index + 1

Correct.

Python

Remove trailing comma.

JSON

a > 47 & y < 52

a > 47 and y < 52

Use 'and' not '&'.

Python

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

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

Declare before use.

C++

Correct.

XML

def render puts 'data' end

Correct.

Ruby

// comment

/* comment */

Use /* */.

CSS

let b: number | null = null; b.toFixed(66);

let b: number | null = null; if(b!==null) b.toFixed(66);

Null check.

TypeScript

Add rel for security.

HTML

package main func main() {{}}

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

Import needed.

Go

class Person {{ int y; }};

class Person {{ public: int y; }};

Make public.

C++

UPDATE orders SET status='world' WHERE status=41

UPDATE orders SET status='world' WHERE status=41;

Add semicolon.

SQL

<table><tr><td>world<td>hello</tr></table>

<table><tr><td>world</td><td>hello</td></tr></table>

Close td.

HTML

INSERT INTO products VALUES ('world',96)

INSERT INTO products (id, role) VALUES ('world',96);

Specify columns.

SQL

list: - item1 - item2

Correct.

YAML

$arr[67]

if ($arr.Count -gt 67) {{ $arr[67] }}

Check bounds.

PowerShell

DELETE FROM orders WHERE email=64

DELETE FROM orders WHERE email=64;

Add semicolon.

SQL

if foo = 8

if foo == 8

Use ==.

Ruby

x := 61

Correct.

Go

data[29]

if (length(data) >= 29) data[29]

Check length.

R

int arr[82]; arr[82]=5;

int arr[82]; if(82<82){{}} else arr[82]=5;

Bounds check.

C++

let z: number = 'result';

let z: string = 'result';

Fix type.

TypeScript

if (num = 18) {{}}

if (num == 18) {{}}

Use ==.

Java

match item {{ 1 => {{}} }}

match item {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

'world' + 61

'world' + str(61)

Can't add int to string.

Python

let count = 'world'

let count = "world"

Double quotes.

Swift

Add alt text.

HTML

assert index > 96

Correct.

Python

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

let mut foo=60; let r1=&mut foo; let r2=&mut foo;

let mut foo=60; {{ let r1=&mut foo; }} let r2=&mut foo;

Only one mutable borrow.

Rust

function baz(x:string){{return x;}} baz(66);

function baz(x:string){{return x;}} baz('value');

Pass correct type.

TypeScript

raise 'value'

raise Exception('value')

Raise needs an exception class.

Python

fmt.Println 'data'

fmt.Println('data')

Missing parentheses.

Go

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

Correct.

Java

int* person = nullptr; *person=5;

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

Allocate memory.

C++

p {{ color: blue }}

p {{ color: blue; }}

Add semicolon.

CSS

if c > 6 puts 'info'

if c > 6 puts 'info' end

Add 'end'.

Ruby

Use style attribute.

CSS

list[53]

if (list.indices.contains(53)) list[53]

Check index.

Kotlin

re.sqrt(7)

import re re.sqrt(7)

Import module first.

Python

.Person {{ color: green; }}

Correct.

CSS

let text = String::from("info"); let ref=&text; text.push_str("!");

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

Cannot mutate while borrowed.

Rust

[91, 90, 25

[91, 90, 25]

Close bracket.

Ruby

SELECT * FROM orders WHRE status=75;

SELECT * FROM orders WHERE status=75;

Fix WHERE.

SQL

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(16);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(16, () => console.log('listening'));

Add callback.

Node.js

val foo: Int = 'world'

val foo: String = 'world'

Fix type.

Kotlin

cin >> x;

int x; cin >> x;

Declare variable.

C++

Use CSS.

HTML

if (bar = 45)

if (bar == 45)

Use ==.

C++

'value' + 1

'value' + 1.to_s

Convert int.

Ruby

if (temp = 37) {{}}

if (temp === 37) {{}}

Use === for equality.

JavaScript

Nest properly.

HTML

h1 {{ font-size:5px color:red; }}

h1 {{ font-size:5px; color:red; }}

Add semicolon.

CSS

count = data

count = 'data'

Quote strings.

Python

$y = 60; if ($y = 60) {{}}

$y = 60; if ($y == 60) {{}}

Use ==.

PHP

SELECT name email FROM products;

SELECT name, email FROM products;

Add comma.

SQL

if ($item = 71)

if ($item == 71)

Use ==.

Perl

for (z in items)

for (z of items)

for...in iterates keys.

JavaScript

if y > 3 puts 'message'

if y > 3 puts 'message' end

Add 'end'.

Ruby

if [ $num = 84 ]; then

if [ "$num" = 84 ]; then

Quote variable.

Shell

if bar = 28 {{}}

if bar == 28 {{}}

Use ==.

Swift

Use double quotes.

JSON

data.forEach(function(temp) {{ console.log(temp); }})

data.forEach((temp) => {{ console.log(temp); }})

Arrow functions are cleaner.

JavaScript

if (result = 55) {{}}

if (result === 55) {{}}

Use === for equality.

JavaScript