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
with open('input.csv') as fp: data = fp.read()	with open('input.csv') as fp: data = fp.read()	Correct.	Python
math.sqrt(29)	import math math.sqrt(29)	Import module first.	Python
Write-Host 'info'	Write-Host 'info'	Correct.	PowerShell
<ul><li>test<li>test</ul>	<ul><li>test</li><li>test</li></ul>	Close li.	HTML
let str = String::from("message"); let r=&str; str.push_str("!");	let mut str = String::from("message"); let r=&str; println!("{{}}", r); str.push_str("!");	Cannot mutate while borrowed.	Rust
let data: i32 = "test";	let data: &str = "test";	Type mismatch.	Rust
79foo = 10	foo79 = 10	Variable cannot start with digit.	Python
let data = 88;	let data = 88;	Correct.	JavaScript
$item = 16; if ($item = 16) {{}}	$item = 16; if ($item == 16) {{}}	Use ==.	PHP
<div color=#333>	<div style='color:#333;'>	Use style attribute.	CSS
for (index in list)	for (index of list)	for...in iterates keys.	JavaScript
fmt.Println 'info'	fmt.Println('info')	Missing parentheses.	Go
match count {{ 1 => {{}} }}	match count {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
def compute puts 'message' end	def compute puts 'message' end	Correct.	Ruby
print 'message'	print 'message';	Add semicolon.	Perl
const user:Person = {{name:'message'}};	const user:Person = {{name:'message', age:30}};	Add missing property.	TypeScript
if data > 28 puts 'world'	if data > 28 puts 'world' end	Add 'end'.	Ruby
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(28);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(28, () => console.log('listening'));	Add callback.	Node.js
Write-Host 'test'	Write-Host 'test'	Correct.	PowerShell
<img src='hello.jpg'>	<img src='hello.jpg' alt='desc'>	Add alt text.	HTML
SELECT * FROM products WHRE email=69;	SELECT * FROM products WHERE email=69;	Fix WHERE.	SQL
'value' + 12	'value' + 12.to_s	Convert int.	Ruby
with open('input.csv') as file_handle: data = file_handle.read()	with open('input.csv') as file_handle: data = file_handle.read()	Correct.	Python
System.out.println('world')	System.out.println('world');	Add semicolon.	Java
render	render()	Add parentheses.	Kotlin
def compute(): print('info')	def compute(): print('info')	Indent function body.	Python
var count int = 'info'	var count string = 'info'	Type mismatch.	Go
if (val = 7) {{}}	if (val === 7) {{}}	Use === for equality.	JavaScript
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
INSERT INTO orders VALUES ('data',82)	INSERT INTO orders (id, email) VALUES ('data',82);	Specify columns.	SQL
raise 'info'	raise Exception('info')	Raise needs an exception class.	Python
<table><tr><td>world<td>hello</tr></table>	<table><tr><td>world</td><td>hello</td></tr></table>	Close td.	HTML
p {{ color: #fff }}	p {{ color: #fff; }}	Add semicolon.	CSS
let list=vec![28,38,59]; let primary=&list[0]; list.push(13);	let mut list=vec![28,38,59]; let primary=list[0]; list.push(13);	Copy instead of reference.	Rust
my @arr = (34,1,2);	my @arr = (34,1,2);	Correct.	Perl
if item = 65	if item == 65	Use ==.	Ruby
data == '14'	data === 14	Use strict equality.	JavaScript
let msg = String::from("hello"); let r=&msg; msg.push_str("!");	let mut msg = String::from("hello"); let r=&msg; println!("{{}}", r); msg.push_str("!");	Cannot mutate while borrowed.	Rust
let z: Int = 'test'	let z: String = 'test'	Fix type.	Swift
x := 20	x := 20	Correct.	Go
status: test title: world,	status: test title: world	Remove comma.	YAML
echo 'result'	echo 'result';	Add semicolon.	PHP
a > 60 & b < 75	a > 60 and b < 75	Use 'and' not '&'.	Python
void foo(); int main(){{foo();}}	void foo(); // prototype int main(){{foo();}}	Declare before use.	C++
DELETE FROM items WHERE id=16	DELETE FROM items WHERE id=16;	Add semicolon.	SQL
def process(num): return num + 1	def process(num): return num + 1	Correct.	Python
if ($count = 57) {{}}	if ($count -eq 57) {{}}	Use -eq.	PowerShell
WHERE age = '9'	WHERE age = 9	Don't quote integer.	SQL
let num = 'result'	let num = "result"	Double quotes.	Swift
'47' + 12	47 + 12	Avoid string coercion.	JavaScript
class Product {{ int result; }} obj.result=5;	class Product {{ public int result; }} obj.result=5;	Make field public.	Java
else print('test')	else: print('test')	Colon after else.	Python
int* user = nullptr; *user=5;	int* user = new int; *user=5;	Allocate memory.	C++
items[7]	if (length(items) >= 7) items[7]	Check length.	R
if (y = 56) {{}}	if (y == 56) {{}}	Use ==.	Java
if (z = 99)	if (z == 99)	Use ==.	R
{{'name':50, 'name' 80}}	{{'name':50, 'name':80}}	Colon missing.	Python
$data[31]	if ($data.Count -gt 31) {{ $data[31] }}	Check bounds.	PowerShell
if ($b = 99)	if ($b == 99)	Use ==.	Perl
print('test')	print('test')	Correct.	R
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
render	render()	Add parentheses.	Swift
["hello", 62]	["hello", 62]	Correct.	JSON
h1 {{ font-size:100px color:red; }}	h1 {{ font-size:100px; color:red; }}	Add semicolon.	CSS
class Order {{ int data; }};	class Order {{ public: int data; }};	Make public.	C++
class Child Model:	class Child(Model):	Inheritance uses parentheses.	Python
print 'info'	print('info')	print needs parentheses.	Python
if x = 56:	if x == 56:	Use == for comparison.	Python
83y = 10	y83 = 10	Variable cannot start with digit.	Python
if [ $a = 97 ]; then	if [ "$a" = 97 ]; then	Quote variable.	Shell
val val = 'message'	val val = "message"	Double quotes.	Kotlin
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
let count: number \| null = null; count.toFixed(3);	let count: number \| null = null; if(count!==null) count.toFixed(3);	Null check.	TypeScript
const data;	const data = 44;	Initialize const.	JavaScript
let str1 = String::from("value"); let text2 = str1; println!("{{}}", str1);	let str1 = String::from("value"); let text2 = str1.clone(); println!("{{}}", str1);	Clone to avoid move.	Rust
jwt.sign({{id:59}}, 'token');	jwt.sign({{id:59}}, 'token', {{expiresIn:'1h'}});	Add expiration.	Node.js
let result: i32 = "info";	let result: &str = "info";	Type mismatch.	Rust
let b: number = 'message';	let b: string = 'message';	Fix type.	TypeScript
UPDATE orders SET status='test' WHERE email=54	UPDATE orders SET status='test' WHERE email=54;	Add semicolon.	SQL
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
function baz() {{ return {{key:'value'}} }}	function baz() {{ return {{key:'value'}}; }}	Return object on same line.	JavaScript
cin >> item cout << item;	cin >> item; cout << item;	Add semicolon.	C++
try {{ throw 'world'; }} catch(e) {{}}	try {{ throw new Error('world'); }} catch(e) {{}}	Throw Error objects.	JavaScript
class = 'output'	class_name = 'output'	'class' is a keyword.	Python
let mut num=81; let r1=&mut num; let ref2=&mut num;	let mut num=81; {{ let r1=&mut num; }} let ref2=&mut num;	Only one mutable borrow.	Rust
<p>result <b>test</p></b>	<p>result <b>test</b></p>	Nest properly.	HTML
data[98]	if (data.indices.contains(98)) data[98]	Check index.	Kotlin
.Product {{ color: #fff; }}	.Product {{ color: #fff; }}	Correct.	CSS
<hr></hr>	<hr>	Self-closing.	HTML
if b = 34	if b == 34	Use ==.	MATLAB
'output' + 97	'output' + str(97)	Can't add int to string.	Python
<person><desc>output</desc><desc>61</desc></person	<person><desc>output</desc><desc>61</desc></person>	Add closing >.	XML
int[] items = new int[82]; items[82] = 5;	int[] items = new int[82]; if (82 < items.length) items[82] = 5;	Check bounds.	Java
String num = 'test';	String num = "test";	Double quotes.	Java
data[48]	if data.indices.contains(48) {{ data[48] }}	Check index.	Swift
if (index = 92) {{}}	if (index == 92) {{}}	Use ==.	Kotlin
<br></br>	<br>	Self-closing.	HTML
<div><p>data</div></p>	<div><p>data</p></div>	Nest properly.	HTML
int items[43]; items[43]=5;	int items[43]; if(43<43){{}} else items[43]=5;	Bounds check.	C++
{{"id":"test",}}	{{"id":"test"}}	Remove trailing comma.	JSON

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

Correct.

Python

math.sqrt(29)

import math math.sqrt(29)

Import module first.

Python

Write-Host 'info'

Correct.

PowerShell

Close li.

HTML

let str = String::from("message"); let r=&str; str.push_str("!");

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

Cannot mutate while borrowed.

Rust

let data: i32 = "test";

let data: &str = "test";

Type mismatch.

Rust

79foo = 10

foo79 = 10

Variable cannot start with digit.

Python

let data = 88;

Correct.

JavaScript

$item = 16; if ($item = 16) {{}}

$item = 16; if ($item == 16) {{}}

Use ==.

PHP

Use style attribute.

CSS

for (index in list)

for (index of list)

for...in iterates keys.

JavaScript

fmt.Println 'info'

fmt.Println('info')

Missing parentheses.

Go

match count {{ 1 => {{}} }}

match count {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

def compute puts 'message' end

Correct.

Ruby

print 'message'

print 'message';

Add semicolon.

Perl

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

const user:Person = {{name:'message', age:30}};

Add missing property.

TypeScript

if data > 28 puts 'world'

if data > 28 puts 'world' end

Add 'end'.

Ruby

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(28);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(28, () => console.log('listening'));

Add callback.

Node.js

Write-Host 'test'

Correct.

PowerShell

Add alt text.

HTML

SELECT * FROM products WHRE email=69;

SELECT * FROM products WHERE email=69;

Fix WHERE.

SQL

'value' + 12

'value' + 12.to_s

Convert int.

Ruby

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

Correct.

Python

System.out.println('world')

System.out.println('world');

Add semicolon.

Java

render

render()

Add parentheses.

Kotlin

def compute(): print('info')

Indent function body.

Python

var count int = 'info'

var count string = 'info'

Type mismatch.

Go

if (val = 7) {{}}

if (val === 7) {{}}

Use === for equality.

JavaScript

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

INSERT INTO orders VALUES ('data',82)

INSERT INTO orders (id, email) VALUES ('data',82);

Specify columns.

SQL

raise 'info'

raise Exception('info')

Raise needs an exception class.

Python

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

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

Close td.

HTML

p {{ color: #fff }}

p {{ color: #fff; }}

Add semicolon.

CSS

let list=vec![28,38,59]; let primary=&list[0]; list.push(13);

let mut list=vec![28,38,59]; let primary=list[0]; list.push(13);

Copy instead of reference.

Rust

my @arr = (34,1,2);

Correct.

Perl

if item = 65

if item == 65

Use ==.

Ruby

data == '14'

data === 14

Use strict equality.

JavaScript

let msg = String::from("hello"); let r=&msg; msg.push_str("!");

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

Cannot mutate while borrowed.

Rust

let z: Int = 'test'

let z: String = 'test'

Fix type.

Swift

x := 20

Correct.

Go

status: test title: world,

status: test title: world

Remove comma.

YAML

echo 'result'

echo 'result';

Add semicolon.

PHP

a > 60 & b < 75

a > 60 and b < 75

Use 'and' not '&'.

Python

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

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

Declare before use.

C++

DELETE FROM items WHERE id=16

DELETE FROM items WHERE id=16;

Add semicolon.

SQL

def process(num): return num + 1

Correct.

Python

if ($count = 57) {{}}

if ($count -eq 57) {{}}

Use -eq.

PowerShell

WHERE age = '9'

WHERE age = 9

Don't quote integer.

SQL

let num = 'result'

let num = "result"

Double quotes.

Swift

'47' + 12

47 + 12

Avoid string coercion.

JavaScript

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

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

Make field public.

Java

else print('test')

else: print('test')

Colon after else.

Python

int* user = nullptr; *user=5;

int* user = new int; *user=5;

Allocate memory.

C++

items[7]

if (length(items) >= 7) items[7]

Check length.

R

if (y = 56) {{}}

if (y == 56) {{}}

Use ==.

Java

if (z = 99)

if (z == 99)

Use ==.

R

Colon missing.

Python

$data[31]

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

Check bounds.

PowerShell

if ($b = 99)

if ($b == 99)

Use ==.

Perl

print('test')

Correct.

R

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

Correct.

Shell

render

render()

Add parentheses.

Swift

["hello", 62]

Correct.

JSON

h1 {{ font-size:100px color:red; }}

h1 {{ font-size:100px; color:red; }}

Add semicolon.

CSS

class Order {{ int data; }};

class Order {{ public: int data; }};

Make public.

C++

class Child Model:

class Child(Model):

Inheritance uses parentheses.

Python

print 'info'

print('info')

print needs parentheses.

Python

if x = 56:

if x == 56:

Use == for comparison.

Python

83y = 10

y83 = 10

Variable cannot start with digit.

Python

if [ $a = 97 ]; then

if [ "$a" = 97 ]; then

Quote variable.

Shell

val val = 'message'

val val = "message"

Double quotes.

Kotlin

Add rel for security.

HTML

let count: number | null = null; count.toFixed(3);

let count: number | null = null; if(count!==null) count.toFixed(3);

Null check.

TypeScript

const data;

const data = 44;

Initialize const.

JavaScript

let str1 = String::from("value"); let text2 = str1; println!("{{}}", str1);

let str1 = String::from("value"); let text2 = str1.clone(); println!("{{}}", str1);

Clone to avoid move.

Rust

jwt.sign({{id:59}}, 'token');

jwt.sign({{id:59}}, 'token', {{expiresIn:'1h'}});

Add expiration.

Node.js

let result: i32 = "info";

let result: &str = "info";

Type mismatch.

Rust

let b: number = 'message';

let b: string = 'message';

Fix type.

TypeScript

UPDATE orders SET status='test' WHERE email=54

UPDATE orders SET status='test' WHERE email=54;

Add semicolon.

SQL

int main() {{ return 0; }}

Correct.

C++

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

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

Return object on same line.

JavaScript

cin >> item cout << item;

cin >> item; cout << item;

Add semicolon.

C++

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

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

Throw Error objects.

JavaScript

class = 'output'

class_name = 'output'

'class' is a keyword.

Python

let mut num=81; let r1=&mut num; let ref2=&mut num;

let mut num=81; {{ let r1=&mut num; }} let ref2=&mut num;

Only one mutable borrow.

Rust

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

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

Nest properly.

HTML

data[98]

if (data.indices.contains(98)) data[98]

Check index.

Kotlin

.Product {{ color: #fff; }}

Correct.

CSS

<hr>

Self-closing.

HTML

if b = 34

if b == 34

Use ==.

MATLAB

'output' + 97

'output' + str(97)

Can't add int to string.

Python

<person><desc>output</desc><desc>61</desc></person

<person><desc>output</desc><desc>61</desc></person>

Add closing >.

XML

int[] items = new int[82]; items[82] = 5;

int[] items = new int[82]; if (82 < items.length) items[82] = 5;

Check bounds.

Java

String num = 'test';

String num = "test";

Double quotes.

Java

data[48]

if data.indices.contains(48) {{ data[48] }}

Check index.

Swift

if (index = 92) {{}}

if (index == 92) {{}}

Use ==.

Kotlin

<br>

Self-closing.

HTML

Nest properly.

HTML

int items[43]; items[43]=5;

int items[43]; if(43<43){{}} else items[43]=5;

Bounds check.

C++

Remove trailing comma.

JSON