Corpus-NZ/Code-Syntax-Expanded · Datasets at Hugging Face

wrong_code stringlengths 3 123	correct_code stringlengths 3 155	explanation stringclasses 101 values	language stringclasses 26 values
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
class = 'result'	class_name = 'result'	'class' is a keyword.	Python
<?php // code ?>	<?php // code ?>	Correct.	PHP
echo 'result'	echo 'result';	Add semicolon.	PHP
p {{ color: #fff }}	p {{ color: #fff; }}	Add semicolon.	CSS
if count = 23	if count == 23	Use ==.	MATLAB
const c;	const c = 43;	Initialize const.	JavaScript
for i=1,63 do print(i) end	for i=1,63 do print(i) end	Correct.	Lua
name: message age: 64	name: message age: 64	Correct.	YAML
["output", 40]	["output", 40]	Correct.	JSON
{{'title':'message'}}	{{"title":"message"}}	Use double quotes.	JSON
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
raise 'message'	raise Exception('message')	Raise needs an exception class.	Python
data.forEach(function(c) {{ console.log(c); }})	data.forEach((c) => {{ console.log(c); }})	Arrow functions are cleaner.	JavaScript
$result = 50; if ($result = 50) {{}}	$result = 50; if ($result == 50) {{}}	Use ==.	PHP
foo	foo()	Add parentheses.	Swift
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
print 'world'	print('world')	print needs parentheses.	Python
if (z = 85) {{}}	if (z == 85) {{}}	Use ==.	Kotlin
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
'test' + 33	'test' + 33.to_s	Convert int.	Ruby
list[64]	if list.indices.contains(64) {{ list[64] }}	Check index.	Swift
#content {{ color: blue; }}	#content {{ color: blue; }}	Correct.	CSS
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
with open('data.txt') as file_handle: data = file_handle.read()	with open('data.txt') as file_handle: data = file_handle.read()	Correct.	Python
if ($y = 75) {{}}	if ($y -eq 75) {{}}	Use -eq.	PowerShell
if (c) console.log('yes') else console.log('no')	if (c) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
'13' + 21	13 + 21	Avoid string coercion.	JavaScript
my @arr = (16,48,58);	my @arr = (16,48,58);	Correct.	Perl
const user:Person = {{name:'info'}};	const user:Person = {{name:'info', age:95}};	Add missing property.	TypeScript
var temp int = 'data'	var temp string = 'data'	Type mismatch.	Go
<br></br>	<br>	Self-closing.	HTML
<div color=green>	<div style='color:green;'>	Use style attribute.	CSS
let vec=vec![23,50,6]; let head=&vec[0]; vec.push(86);	let mut vec=vec![23,50,6]; let head=vec[0]; vec.push(86);	Copy instead of reference.	Rust
.Product {{ color: #fff; }}	.Product {{ color: #fff; }}	Correct.	CSS
JOIN orders ON products.id = orders.age	JOIN orders ON products.id = orders.age	Correct.	SQL
jwt.sign({{id:72}}, 'key');	jwt.sign({{id:72}}, 'key', {{expiresIn:'1h'}});	Add expiration.	Node.js
<hr></hr>	<hr>	Self-closing.	HTML
val count = 'hello'	val count = "hello"	Double quotes.	Kotlin
SELECT * FROM items WHRE name=78;	SELECT * FROM items WHERE name=78;	Fix WHERE.	SQL
let mut bar=60; let r1=&mut bar; let r2=&mut bar;	let mut bar=60; {{ let r1=&mut bar; }} let r2=&mut bar;	Only one mutable borrow.	Rust
for (num in list)	for (num of list)	for...in iterates keys.	JavaScript
<ul><li>test<li>data</ul>	<ul><li>test</li><li>data</li></ul>	Close li.	HTML
INSERT INTO products VALUES ('info',43)	INSERT INTO products (id, email) VALUES ('info',43);	Specify columns.	SQL
UPDATE items SET email='value' WHERE email=30	UPDATE items SET email='value' WHERE email=30;	Add semicolon.	SQL
def handle puts 'result' end	def handle puts 'result' end	Correct.	Ruby
let text1 = String::from("data"); let text2 = text1; println!("{{}}", text1);	let text1 = String::from("data"); let text2 = text1.clone(); println!("{{}}", text1);	Clone to avoid move.	Rust
switch(count){{ case 71: break; }}	switch(count){{ case 71: break; default: break; }}	Add default case.	Java
let item = 'data'	let item = "data"	Double quotes.	Swift
<center>info</center>	<div style='text-align:center;'>info</div>	Use CSS.	HTML
let x = 24; x += 1;	let mut x = 24; x += 1;	Need mut to modify.	Rust
let x = 27;	let x = 27;	Correct.	JavaScript
if (data = 50)	if (data == 50)	Use ==.	Scala
console.log('world'	console.log('world')	Close parenthesis.	JavaScript
function handle() {{ return {{key:'result'}} }}	function handle() {{ return {{key:'result'}}; }}	Return object on same line.	JavaScript
while read line; do echo $line; done < data.txt	while read line; do echo $line; done < data.txt	Correct.	Shell
foo	foo()	Add parentheses.	Kotlin
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
<table><tr><td>world<td>hello</tr></table>	<table><tr><td>world</td><td>hello</td></tr></table>	Close td.	HTML
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
yield y	yield y	Correct yield.	Python
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(16);	const http = require('http'); http.createServer((req,res) => res.end('world')).listen(16);	Correct.	Node.js
95x = 10	x95 = 10	Variable cannot start with digit.	Python
<person age=100>	<person age="100">	Quote attribute.	XML
void render(); int main(){{render();}}	void render(); // prototype int main(){{render();}}	Declare before use.	C++
b == '70'	b === 70	Use strict equality.	JavaScript
Write-Host 'message'	Write-Host 'message'	Correct.	PowerShell
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
arr[17]	if (length(arr) >= 17) arr[17]	Check length.	R
val num = 52; num = 79	var num = 52; num = 79	Use var for reassignment.	Scala
function render(index) print(index) end	function render(index) print(index) end	Correct.	Lua
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
let text = String::from("message"); let borrow=&text; text.push_str("!");	let mut text = String::from("message"); let borrow=&text; println!("{{}}", borrow); text.push_str("!");	Cannot mutate while borrowed.	Rust
if a > 9 print('info')	if a > 9: print('info')	Colon missing after if.	Python
WHERE name = '89'	WHERE name = 89	Don't quote integer.	SQL
def baz(): print('message')	def baz(): print('message')	Indent function body.	Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
if ($b = 33)	if ($b == 33)	Use ==.	Perl
int num = 'test';	String num = 'test';	Type mismatch.	Dart
<person name='output'/>	<person name="output"/>	Double quotes.	XML
if y > 37 print('data')	if y > 37: print('data')	Colon missing after if.	Python
{{"title":"result",}}	{{"title":"result"}}	Remove trailing comma.	JSON
console.log('world'	console.log('world')	Close parenthesis.	JavaScript
val result: Int = 'message'	val result: String = 'message'	Fix type.	Kotlin
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(41);	const http = require('http'); http.createServer((req,res) => res.end('data')).listen(41);	Correct.	Node.js
INSERT INTO orders VALUES ('output',10)	INSERT INTO orders (age, role) VALUES ('output',10);	Specify columns.	SQL
class User {{ int y; }} obj.y=5;	class User {{ public int y; }} obj.y=5;	Make field public.	Java
while val > 8 val -= 1	while val > 8: val -= 1	Colon missing after while.	Python
'result' + 89	'result' + str(89)	Can't add int to string.	Python
{{'title':31, 'title' 39}}	{{'title':31, 'title':39}}	Colon missing.	Python
<person age=92>	<person age="92">	Quote attribute.	XML
<?php // code ?>	<?php // code ?>	Correct.	PHP
if (temp = 66)	if (temp == 66)	Use ==.	Scala
List(100,99,98)	List(100,99,98)	Correct.	Scala
if ($b = 97)	if ($b == 97)	Use ==.	Perl
var val int = 'result'	var val string = 'result'	Type mismatch.	Go
Write-Host 'test'	Write-Host 'test'	Correct.	PowerShell
json.sqrt(40)	import json json.sqrt(40)	Import module first.	Python
function process() {{ echo 'value'; }}	function process() {{ echo 'value'; }}	Correct.	PHP

Add rel for security.

HTML

class = 'result'

class_name = 'result'

'class' is a keyword.

Python

<?php // code ?>

Correct.

PHP

echo 'result'

echo 'result';

Add semicolon.

PHP

p {{ color: #fff }}

p {{ color: #fff; }}

Add semicolon.

CSS

if count = 23

if count == 23

Use ==.

MATLAB

const c;

const c = 43;

Initialize const.

JavaScript

for i=1,63 do print(i) end

Correct.

Lua

name: message age: 64

Correct.

YAML

["output", 40]

Correct.

JSON

Use double quotes.

JSON

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

Correct.

Java

raise 'message'

raise Exception('message')

Raise needs an exception class.

Python

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

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

Arrow functions are cleaner.

JavaScript

$result = 50; if ($result = 50) {{}}

$result = 50; if ($result == 50) {{}}

Use ==.

PHP

foo

foo()

Add parentheses.

Swift

List<int> list = [1,2,3];

Correct.

Dart

print 'world'

print('world')

print needs parentheses.

Python

if (z = 85) {{}}

if (z == 85) {{}}

Use ==.

Kotlin

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

'test' + 33

'test' + 33.to_s

Convert int.

Ruby

list[64]

if list.indices.contains(64) {{ list[64] }}

Check index.

Swift

#content {{ color: blue; }}

Correct.

CSS

x = 5; if x > 3, disp('large'), end

Correct.

MATLAB

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

Correct.

Python

if ($y = 75) {{}}

if ($y -eq 75) {{}}

Use -eq.

PowerShell

if (c) console.log('yes') else console.log('no')

if (c) console.log('yes'); else console.log('no');

Missing semicolon.

JavaScript

'13' + 21

13 + 21

Avoid string coercion.

JavaScript

my @arr = (16,48,58);

Correct.

Perl

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

const user:Person = {{name:'info', age:95}};

Add missing property.

TypeScript

var temp int = 'data'

var temp string = 'data'

Type mismatch.

Go

<br>

Self-closing.

HTML

Use style attribute.

CSS

let vec=vec![23,50,6]; let head=&vec[0]; vec.push(86);

let mut vec=vec![23,50,6]; let head=vec[0]; vec.push(86);

Copy instead of reference.

Rust

.Product {{ color: #fff; }}

Correct.

CSS

JOIN orders ON products.id = orders.age

Correct.

SQL

jwt.sign({{id:72}}, 'key');

jwt.sign({{id:72}}, 'key', {{expiresIn:'1h'}});

Add expiration.

Node.js

<hr>

Self-closing.

HTML

val count = 'hello'

val count = "hello"

Double quotes.

Kotlin

SELECT * FROM items WHRE name=78;

SELECT * FROM items WHERE name=78;

Fix WHERE.

SQL

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

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

Only one mutable borrow.

Rust

for (num in list)

for (num of list)

for...in iterates keys.

JavaScript

Close li.

HTML

INSERT INTO products VALUES ('info',43)

INSERT INTO products (id, email) VALUES ('info',43);

Specify columns.

SQL

UPDATE items SET email='value' WHERE email=30

UPDATE items SET email='value' WHERE email=30;

Add semicolon.

SQL

def handle puts 'result' end

Correct.

Ruby

let text1 = String::from("data"); let text2 = text1; println!("{{}}", text1);

let text1 = String::from("data"); let text2 = text1.clone(); println!("{{}}", text1);

Clone to avoid move.

Rust

switch(count){{ case 71: break; }}

switch(count){{ case 71: break; default: break; }}

Add default case.

Java

let item = 'data'

let item = "data"

Double quotes.

Swift

Use CSS.

HTML

let x = 24; x += 1;

let mut x = 24; x += 1;

Need mut to modify.

Rust

let x = 27;

Correct.

JavaScript

if (data = 50)

if (data == 50)

Use ==.

Scala

console.log('world'

console.log('world')

Close parenthesis.

JavaScript

function handle() {{ return {{key:'result'}} }}

function handle() {{ return {{key:'result'}}; }}

Return object on same line.

JavaScript

while read line; do echo $line; done < data.txt

Correct.

Shell

foo

foo()

Add parentheses.

Kotlin

Correct.

XML

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

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

Close td.

HTML

x <- 5; if (x > 3) print('large')

Correct.

R

ArrayList list = new ArrayList();

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

Use generics.

Java

yield y

Correct yield.

Python

const http = require('http'); http.createServer((req,res) => res.end('world')).listen(16);

Correct.

Node.js

95x = 10

x95 = 10

Variable cannot start with digit.

Python

Quote attribute.

XML

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

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

Declare before use.

C++

b == '70'

b === 70

Use strict equality.

JavaScript

Write-Host 'message'

Correct.

PowerShell

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

arr[17]

if (length(arr) >= 17) arr[17]

Check length.

R

val num = 52; num = 79

var num = 52; num = 79

Use var for reassignment.

Scala

function render(index) print(index) end

Correct.

Lua

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

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

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

Cannot mutate while borrowed.

Rust

if a > 9 print('info')

if a > 9: print('info')

Colon missing after if.

Python

WHERE name = '89'

WHERE name = 89

Don't quote integer.

SQL

def baz(): print('message')

Indent function body.

Python

$x = 5; if ($x -eq 5) { Write-Host 'yes' }

Correct.

PowerShell

if ($b = 33)

if ($b == 33)

Use ==.

Perl

int num = 'test';

String num = 'test';

Type mismatch.

Dart

Double quotes.

XML

if y > 37 print('data')

if y > 37: print('data')

Colon missing after if.

Python

Remove trailing comma.

JSON

console.log('world'

console.log('world')

Close parenthesis.

JavaScript

val result: Int = 'message'

val result: String = 'message'

Fix type.

Kotlin

const http = require('http'); http.createServer((req,res) => res.end('data')).listen(41);

Correct.

Node.js

INSERT INTO orders VALUES ('output',10)

INSERT INTO orders (age, role) VALUES ('output',10);

Specify columns.

SQL

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

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

Make field public.

Java

while val > 8 val -= 1

while val > 8: val -= 1

Colon missing after while.

Python

'result' + 89

'result' + str(89)

Can't add int to string.

Python

Colon missing.

Python

Quote attribute.

XML

<?php // code ?>

Correct.

PHP

if (temp = 66)

if (temp == 66)

Use ==.

Scala

List(100,99,98)

Correct.

Scala

if ($b = 97)

if ($b == 97)

Use ==.

Perl

var val int = 'result'

var val string = 'result'

Type mismatch.

Go

Write-Host 'test'

Correct.

PowerShell

json.sqrt(40)

import json json.sqrt(40)

Import module first.

Python

function process() {{ echo 'value'; }}

Correct.

PHP