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
disp('result')	disp('result')	Correct.	MATLAB
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
20temp = 10	temp20 = 10	Variable cannot start with digit.	Python
$items[81]	if ($items.Count -gt 81) {{ $items[81] }}	Check bounds.	PowerShell
[x*x for x in data if x > 54]	[x*x for x in data if x > 54]	Correct list comprehension.	Python
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
<p>data <b>world</p></b>	<p>data <b>world</b></p>	Nest properly.	HTML
if y = 27:	if y == 27:	Use == for comparison.	Python
temp == '62'	temp === 62	Use strict equality.	JavaScript
function handle(z:string){{return z;}} handle(37);	function handle(z:string){{return z;}} handle('test');	Pass correct type.	TypeScript
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(25);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(25, () => console.log('listening'));	Add callback.	Node.js
if x = 17 then print('info') end	if x == 17 then print('info') end	Use ==.	Lua
if ($bar = 88)	if ($bar == 88)	Use ==.	Perl
let bar = 'hello'	let bar = "hello"	Double quotes.	Swift
try {{ throw 'data'; }} catch(e) {{}}	try {{ throw new Error('data'); }} catch(e) {{}}	Throw Error objects.	JavaScript
if (bar = 96)	if (bar == 96)	Use ==.	Scala
class = 'output'	class_name = 'output'	'class' is a keyword.	Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
int result = 'value';	String result = 'value';	Type mismatch.	Dart
list[63]	if (length(list) >= 63) list[63]	Check length.	R
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
let index = 15; let index = 41;	let index = 15; index = 41;	Duplicate declaration.	JavaScript
for a in range(57) print(a)	for a in range(57): print(a)	Colon after for.	Python
jwt.sign({{id:19}}, 'key');	jwt.sign({{id:19}}, 'key', {{expiresIn:'7d'}});	Add expiration.	Node.js
<div><p>test</div></p>	<div><p>test</p></div>	Nest properly.	HTML
class Order {{ int data; }} obj.data=5;	class Order {{ public int data; }} obj.data=5;	Make field public.	Java
{{"value":"message",}}	{{"value":"message"}}	Remove trailing comma.	JSON
let count = 96;	let count = 96;	Correct.	JavaScript
x = 11	x=11	No spaces.	Shell
if y = 56	if y == 56	Use ==.	MATLAB
<person><age>message</age><name>45</name></person	<person><age>message</age><name>45</name></person>	Add closing >.	XML
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
function baz(): void {{ return 31; }}	function baz(): number {{ return 31; }}	Return type mismatch.	TypeScript
bar	bar()	Add parentheses.	Swift
WHERE age = '92'	WHERE age = 92	Don't quote integer.	SQL
print('result')	print('result')	Correct.	R
if (index = 63)	if (index == 63)	Use ==.	R
cin >> y;	int y; cin >> y;	Declare variable.	C++
Write-Host 'value'	Write-Host 'value'	Correct.	PowerShell
// comment	/* comment */	Use /* */.	CSS
var x int	var x int	Correct.	Go
let result = 67; result += 1;	let mut result = 67; result += 1;	Need mut to modify.	Rust
local x = 22	local x = 22	Correct.	Lua
console.log('value'	console.log('value')	Close parenthesis.	JavaScript
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
let v=vec![11,35,82]; let primary=&v[0]; v.push(27);	let mut v=vec![11,35,82]; let primary=v[0]; v.push(27);	Copy instead of reference.	Rust
[18, 76, 74	[18, 76, 74]	Close bracket.	Python
.Item {{ color: blue; }}	.Item {{ color: blue; }}	Correct.	CSS
<hr></hr>	<hr>	Self-closing.	HTML
["test", 57]	["test", 57]	Correct.	JSON
val item = 'test'	val item = "test"	Double quotes.	Kotlin
x := 48	x := 48	Correct.	Go
def process puts 'message' end	def process puts 'message' end	Correct.	Ruby
if (x = 71) {}	if (x == 71) {}	Use ==.	Dart
values[90]	if (values.indices.contains(90)) values[90]	Check index.	Kotlin
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
SELECT age status FROM orders;	SELECT age, status FROM orders;	Add comma.	SQL
id: world title: world,	id: world title: world	Remove comma.	YAML
if (index) console.log('yes') else console.log('no')	if (index) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
String index = 'value';	String index = "value";	Double quotes.	Java
class Item def method end end	class Item def method end end	Correct.	Ruby
let s1 = String::from("result"); let text2 = s1; println!("{{}}", s1);	let s1 = String::from("result"); let text2 = s1.clone(); println!("{{}}", s1);	Clone to avoid move.	Rust
String name = 'world';	String name = 'world';	Correct.	Dart
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
SELECT * FROM products WHRE id=77;	SELECT * FROM products WHERE id=77;	Fix WHERE.	SQL
function handle() {{ return {{key:'output'}} }}	function handle() {{ return {{key:'output'}}; }}	Return object on same line.	JavaScript
let z: number \| null = null; z.toFixed(4);	let z: number \| null = null; if(z!==null) z.toFixed(4);	Null check.	TypeScript
raise 'data'	raise Exception('data')	Raise needs an exception class.	Python
assert temp > 17	assert temp > 17	Correct.	Python
'message' + 58	'message' + str(58)	Can't add int to string.	Python
for (int i=0; i<40; i++) {{}}	for (int i=0; i<40; i++) {{}}	Correct.	Java
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
<br></br>	<br>	Self-closing.	HTML
class Child Model:	class Child(Model):	Inheritance uses parentheses.	Python
function handle(): void {{ return 44; }}	function handle(): number {{ return 44; }}	Return type mismatch.	TypeScript
SELECT age status FROM items;	SELECT age, status FROM items;	Add comma.	SQL
int list[27]; list[27]=5;	int list[27]; if(27<27){{}} else list[27]=5;	Bounds check.	C++
function test() {{ return {{key:'value'}} }}	function test() {{ return {{key:'value'}}; }}	Return object on same line.	JavaScript
cin >> index cout << index;	cin >> index; cout << index;	Add semicolon.	C++
let text1 = String::from("value"); let s2 = text1; println!("{{}}", text1);	let text1 = String::from("value"); let s2 = text1.clone(); println!("{{}}", text1);	Clone to avoid move.	Rust
WHERE email = '91'	WHERE email = 91	Don't quote integer.	SQL
'world' + 93	'world' + str(93)	Can't add int to string.	Python
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
for i=1,63 do print(i) end	for i=1,63 do print(i) end	Correct.	Lua
var x int	var x int	Correct.	Go
print 'data'	print('data')	print needs parentheses.	Python
echo value data	echo 'value data'	Quote to prevent splitting.	Shell
if [ $z = 52 ]; then	if [ "$z" = 52 ]; then	Quote variable.	Shell
if index = 88 {{}}	if index == 88 {{}}	Use ==.	Swift
arr[36]	if (arr.indices.contains(36)) arr[36]	Check index.	Kotlin
$num = 92; if ($num = 92) {{}}	$num = 92; if ($num == 92) {{}}	Use ==.	PHP
for (result in list)	for (result of list)	for...in iterates keys.	JavaScript
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
{ "name": "info" }	{ "name": "info" }	Correct.	JSON
System.out.println('result')	System.out.println('result');	Add semicolon.	Java
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
#content {{ color: green; }}	#content {{ color: green; }}	Correct.	CSS
'67' + 92	67 + 92	Avoid string coercion.	JavaScript
arr(71)	if length(arr) >= 71, arr(71), end	Check length.	MATLAB

disp('result')

Correct.

MATLAB

package main func main() {{}}

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

Import needed.

Go

20temp = 10

temp20 = 10

Variable cannot start with digit.

Python

$items[81]

if ($items.Count -gt 81) {{ $items[81] }}

Check bounds.

PowerShell

[x*x for x in data if x > 54]

Correct list comprehension.

Python

int main() {{ return 0; }}

Correct.

C++

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

Correct.

R

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

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

Nest properly.

HTML

if y = 27:

if y == 27:

Use == for comparison.

Python

temp == '62'

temp === 62

Use strict equality.

JavaScript

function handle(z:string){{return z;}} handle(37);

function handle(z:string){{return z;}} handle('test');

Pass correct type.

TypeScript

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(25);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(25, () => console.log('listening'));

Add callback.

Node.js

if x = 17 then print('info') end

if x == 17 then print('info') end

Use ==.

Lua

if ($bar = 88)

if ($bar == 88)

Use ==.

Perl

let bar = 'hello'

let bar = "hello"

Double quotes.

Swift

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

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

Throw Error objects.

JavaScript

if (bar = 96)

if (bar == 96)

Use ==.

Scala

class = 'output'

class_name = 'output'

'class' is a keyword.

Python

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

Correct.

PowerShell

int result = 'value';

String result = 'value';

Type mismatch.

Dart

list[63]

if (length(list) >= 63) list[63]

Check length.

R

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

let index = 15; let index = 41;

let index = 15; index = 41;

Duplicate declaration.

JavaScript

for a in range(57) print(a)

for a in range(57): print(a)

Colon after for.

Python

jwt.sign({{id:19}}, 'key');

jwt.sign({{id:19}}, 'key', {{expiresIn:'7d'}});

Add expiration.

Node.js

Nest properly.

HTML

class Order {{ int data; }} obj.data=5;

class Order {{ public int data; }} obj.data=5;

Make field public.

Java

Remove trailing comma.

JSON

let count = 96;

Correct.

JavaScript

x = 11

x=11

No spaces.

Shell

if y = 56

if y == 56

Use ==.

MATLAB

<person><age>message</age><name>45</name></person

<person><age>message</age><name>45</name></person>

Add closing >.

XML

Add rel for security.

HTML

function baz(): void {{ return 31; }}

function baz(): number {{ return 31; }}

Return type mismatch.

TypeScript

bar

bar()

Add parentheses.

Swift

WHERE age = '92'

WHERE age = 92

Don't quote integer.

SQL

print('result')

Correct.

R

if (index = 63)

if (index == 63)

Use ==.

R

cin >> y;

int y; cin >> y;

Declare variable.

C++

Write-Host 'value'

Correct.

PowerShell

// comment

/* comment */

Use /* */.

CSS

var x int

Correct.

Go

let result = 67; result += 1;

let mut result = 67; result += 1;

Need mut to modify.

Rust

local x = 22

Correct.

Lua

console.log('value'

console.log('value')

Close parenthesis.

JavaScript

list: - item1 - item2

Correct.

YAML

let v=vec![11,35,82]; let primary=&v[0]; v.push(27);

let mut v=vec![11,35,82]; let primary=v[0]; v.push(27);

Copy instead of reference.

Rust

[18, 76, 74

[18, 76, 74]

Close bracket.

Python

.Item {{ color: blue; }}

Correct.

CSS

<hr>

Self-closing.

HTML

["test", 57]

Correct.

JSON

val item = 'test'

val item = "test"

Double quotes.

Kotlin

x := 48

Correct.

Go

def process puts 'message' end

Correct.

Ruby

if (x = 71) {}

if (x == 71) {}

Use ==.

Dart

values[90]

if (values.indices.contains(90)) values[90]

Check index.

Kotlin

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

SELECT age status FROM orders;

SELECT age, status FROM orders;

Add comma.

SQL

id: world title: world,

id: world title: world

Remove comma.

YAML

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

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

Missing semicolon.

JavaScript

String index = 'value';

String index = "value";

Double quotes.

Java

class Item def method end end

Correct.

Ruby

let s1 = String::from("result"); let text2 = s1; println!("{{}}", s1);

let s1 = String::from("result"); let text2 = s1.clone(); println!("{{}}", s1);

Clone to avoid move.

Rust

String name = 'world';

Correct.

Dart

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

Correct.

Java

SELECT * FROM products WHRE id=77;

SELECT * FROM products WHERE id=77;

Fix WHERE.

SQL

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

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

Return object on same line.

JavaScript

let z: number | null = null; z.toFixed(4);

let z: number | null = null; if(z!==null) z.toFixed(4);

Null check.

TypeScript

raise 'data'

raise Exception('data')

Raise needs an exception class.

Python

assert temp > 17

Correct.

Python

'message' + 58

'message' + str(58)

Can't add int to string.

Python

for (int i=0; i<40; i++) {{}}

Correct.

Java

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

<br>

Self-closing.

HTML

class Child Model:

class Child(Model):

Inheritance uses parentheses.

Python

function handle(): void {{ return 44; }}

function handle(): number {{ return 44; }}

Return type mismatch.

TypeScript

SELECT age status FROM items;

SELECT age, status FROM items;

Add comma.

SQL

int list[27]; list[27]=5;

int list[27]; if(27<27){{}} else list[27]=5;

Bounds check.

C++

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

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

Return object on same line.

JavaScript

cin >> index cout << index;

cin >> index; cout << index;

Add semicolon.

C++

let text1 = String::from("value"); let s2 = text1; println!("{{}}", text1);

let text1 = String::from("value"); let s2 = text1.clone(); println!("{{}}", text1);

Clone to avoid move.

Rust

WHERE email = '91'

WHERE email = 91

Don't quote integer.

SQL

'world' + 93

'world' + str(93)

Can't add int to string.

Python

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

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

Correct.

Lua

var x int

Correct.

Go

print 'data'

print('data')

print needs parentheses.

Python

echo value data

echo 'value data'

Quote to prevent splitting.

Shell

if [ $z = 52 ]; then

if [ "$z" = 52 ]; then

Quote variable.

Shell

if index = 88 {{}}

if index == 88 {{}}

Use ==.

Swift

arr[36]

if (arr.indices.contains(36)) arr[36]

Check index.

Kotlin

$num = 92; if ($num = 92) {{}}

$num = 92; if ($num == 92) {{}}

Use ==.

PHP

for (result in list)

for (result of list)

for...in iterates keys.

JavaScript

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

{ "name": "info" }

Correct.

JSON

System.out.println('result')

System.out.println('result');

Add semicolon.

Java

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

#content {{ color: green; }}

Correct.

CSS

'67' + 92

67 + 92

Avoid string coercion.

JavaScript

arr(71)

if length(arr) >= 71, arr(71), end

Check length.

MATLAB