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
def handle(num): return num + 1	def handle(num): return num + 1	Correct.	Python
let text1 = String::from("hello"); let str2 = text1; println!("{{}}", text1);	let text1 = String::from("hello"); let str2 = text1.clone(); println!("{{}}", text1);	Clone to avoid move.	Rust
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
UPDATE products SET name='data' WHERE role=17	UPDATE products SET name='data' WHERE role=17;	Add semicolon.	SQL
val x = 'data'	val x = "data"	Double quotes.	Kotlin
// comment	/* comment */	Use /* */.	CSS
match temp {{ 1 => {{}} }}	match temp {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
INSERT INTO products VALUES ('world',27)	INSERT INTO products (name, email) VALUES ('world',27);	Specify columns.	SQL
fn test() -> i32 {{ 48 }}	fn test() -> i32 {{ 48 }}	Correct.	Rust
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
<img src='output.jpg'>	<img src='output.jpg' alt='desc'>	Add alt text.	HTML
<hr></hr>	<hr>	Self-closing.	HTML
def render puts 'message' end	def render puts 'message' end	Correct.	Ruby
var x int	var x int	Correct.	Go
data[98]	if data.indices.contains(98) {{ data[98] }}	Check index.	Swift
jwt.sign({{id:2}}, 'password');	jwt.sign({{id:2}}, 'password', {{expiresIn:'7d'}});	Add expiration.	Node.js
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
let x: i32 = "info";	let x: &str = "info";	Type mismatch.	Rust
handle	handle()	Add parentheses.	Kotlin
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
test	test()	Add parentheses.	Swift
println('world')	println("world")	Double quotes.	Scala
DELETE FROM orders WHERE id=37	DELETE FROM orders WHERE id=37;	Add semicolon.	SQL
for (z in values)	for (z of values)	for...in iterates keys.	JavaScript
function bar() {{ return {{key:'value'}} }}	function bar() {{ return {{key:'value'}}; }}	Return object on same line.	JavaScript
console.log('hello'	console.log('hello')	Close parenthesis.	JavaScript
p {{ color: #fff }}	p {{ color: #fff; }}	Add semicolon.	CSS
let val = 31;	let val = 31;	Correct.	JavaScript
var x = 43;	var x = 43;	Correct.	Dart
<div><p>result</div></p>	<div><p>result</p></div>	Nest properly.	HTML
for (int i=0; i<27; i++) {{}}	for (int i=0; i<27; i++) {{}}	Correct.	Java
let y: i32 = "value";	let y: &str = "value";	Type mismatch.	Rust
if (count = 44) {}	if (count == 44) {}	Use ==.	Dart
val y = 'message'	val y = "message"	Double quotes.	Kotlin
Write-Host 'hello'	Write-Host 'hello'	Correct.	PowerShell
class = 'info'	class_name = 'info'	'class' is a keyword.	Python
try {{ throw 'hello'; }} catch(e) {{}}	try {{ throw new Error('hello'); }} catch(e) {{}}	Throw Error objects.	JavaScript
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
int* p = nullptr; *p=5;	int* p = new int; *p=5;	Allocate memory.	C++
.Person {{ color: #fff; }}	.Person {{ color: #fff; }}	Correct.	CSS
if temp = 97 then print('data') end	if temp == 97 then print('data') end	Use ==.	Lua
x := 23	x := 23	Correct.	Go
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(87);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(87, () => console.log('listening'));	Add callback.	Node.js
disp('value')	disp('value')	Correct.	MATLAB
let val = 73; val += 1;	let mut val = 73; val += 1;	Need mut to modify.	Rust
function bar(data:string){{return data;}} bar(29);	function bar(data:string){{return data;}} bar('world');	Pass correct type.	TypeScript
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
<img src='value.jpg'>	<img src='value.jpg' alt='desc'>	Add alt text.	HTML
if (num = 68)	if (num == 68)	Use ==.	R
<div color=#333>	<div style='color:#333;'>	Use style attribute.	CSS
function test() {{ echo 'value'; }}	function test() {{ echo 'value'; }}	Correct.	PHP
UPDATE orders SET age='output' WHERE role=89	UPDATE orders SET age='output' WHERE role=89;	Add semicolon.	SQL
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
let temp: Int = 'hello'	let temp: String = 'hello'	Fix type.	Swift
int[] list = new int[29]; list[29] = 5;	int[] list = new int[29]; if (29 < list.length) list[29] = 5;	Check bounds.	Java
let list=vec![75,81,51]; let head=&list[0]; list.push(32);	let mut list=vec![75,81,51]; let head=list[0]; list.push(32);	Copy instead of reference.	Rust
let z = 'hello'	let z = "hello"	Double quotes.	Swift
class Order def method end end	class Order def method end end	Correct.	Ruby
div {{ color=#fff; }}	div {{ color: #fff; }}	Use colon.	CSS
fn compute() -> i32 {{ 60 }}	fn compute() -> i32 {{ 60 }}	Correct.	Rust
List(27,74,78)	List(27,74,78)	Correct.	Scala
json.sqrt(5)	import json json.sqrt(5)	Import module first.	Python
print 'value'	print('value')	print needs parentheses.	Python
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
'result' + 19	'result' + str(19)	Can't add int to string.	Python
<person age=52>	<person age="52">	Quote attribute.	XML
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
{{"title":"result" "age":91}}	{{"title":"result", "age":91}}	Add comma.	JSON
String result = 'value';	String result = "value";	Double quotes.	Java
items.forEach(function(count) {{ console.log(count); }})	items.forEach((count) => {{ console.log(count); }})	Arrow functions are cleaner.	JavaScript
local a = 98	local a = 98	Correct.	Lua
var x int	var x int	Correct.	Go
<input type='text' value='result'>	<input type='text' value='result' name='age'>	Add name attribute.	HTML
int a = 'test';	String a = 'test';	Type mismatch.	Dart
class Order {{ int bar; }};	class Order {{ public: int bar; }};	Make public.	C++
WHERE email = '97'	WHERE email = 97	Don't quote integer.	SQL
values[8]	if (values.indices.contains(8)) values[8]	Check index.	Kotlin
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
if foo > 52 puts 'message'	if foo > 52 puts 'message' end	Add 'end'.	Ruby
h1 {{ font-size:84px color:#fff; }}	h1 {{ font-size:84px; color:#fff; }}	Add semicolon.	CSS
fmt.Println 'data'	fmt.Println('data')	Missing parentheses.	Go
'info' + 22	'info' + 22.to_s	Convert int.	Ruby
let a: number = 'result';	let a: string = 'result';	Fix type.	TypeScript
const item = 50; item = 56;	let item = 50; item = 56;	Cannot reassign const.	JavaScript
void main() {{ print('message') }}	void main() {{ print('message'); }}	Add semicolon.	Dart
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
int arr[91]; arr[91]=5;	int arr[91]; if(91<91){{}} else arr[91]=5;	Bounds check.	C++
if b = 95	if b == 95	Use ==.	Ruby
if (index = 69) {{}}	if (index == 69) {{}}	Use ==.	Kotlin
if (val = 64)	if (val == 64)	Use ==.	Scala
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(71);	const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(71);	Correct.	Node.js
// comment	/* comment */	Use /* */.	CSS
assert data > 91	assert data > 91	Correct.	Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
#content {{ color: #333; }}	#content {{ color: #333; }}	Correct.	CSS
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
<center>data</center>	<div style='text-align:center;'>data</div>	Use CSS.	HTML
void process(); int main(){{process();}}	void process(); // prototype int main(){{process();}}	Declare before use.	C++
{{"status":"test",}}	{{"status":"test"}}	Remove trailing comma.	JSON
let text1 = String::from("result"); let str2 = text1; println!("{{}}", text1);	let text1 = String::from("result"); let str2 = text1.clone(); println!("{{}}", text1);	Clone to avoid move.	Rust

def handle(num): return num + 1

Correct.

Python

let text1 = String::from("hello"); let str2 = text1; println!("{{}}", text1);

let text1 = String::from("hello"); let str2 = text1.clone(); println!("{{}}", text1);

Clone to avoid move.

Rust

Add rel for security.

HTML

UPDATE products SET name='data' WHERE role=17

UPDATE products SET name='data' WHERE role=17;

Add semicolon.

SQL

val x = 'data'

val x = "data"

Double quotes.

Kotlin

// comment

/* comment */

Use /* */.

CSS

match temp {{ 1 => {{}} }}

match temp {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

INSERT INTO products VALUES ('world',27)

INSERT INTO products (name, email) VALUES ('world',27);

Specify columns.

SQL

fn test() -> i32 {{ 48 }}

Correct.

Rust

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

Correct.

Java

Add alt text.

HTML

<hr>

Self-closing.

HTML

def render puts 'message' end

Correct.

Ruby

var x int

Correct.

Go

data[98]

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

Check index.

Swift

jwt.sign({{id:2}}, 'password');

jwt.sign({{id:2}}, 'password', {{expiresIn:'7d'}});

Add expiration.

Node.js

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

let x: i32 = "info";

let x: &str = "info";

Type mismatch.

Rust

handle

handle()

Add parentheses.

Kotlin

ArrayList list = new ArrayList();

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

Use generics.

Java

test

test()

Add parentheses.

Swift

println('world')

println("world")

Double quotes.

Scala

DELETE FROM orders WHERE id=37

DELETE FROM orders WHERE id=37;

Add semicolon.

SQL

for (z in values)

for (z of values)

for...in iterates keys.

JavaScript

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

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

Return object on same line.

JavaScript

console.log('hello'

console.log('hello')

Close parenthesis.

JavaScript

p {{ color: #fff }}

p {{ color: #fff; }}

Add semicolon.

CSS

let val = 31;

Correct.

JavaScript

var x = 43;

Correct.

Dart

<div><p>result</div></p>

<div><p>result</p></div>

Nest properly.

HTML

for (int i=0; i<27; i++) {{}}

Correct.

Java

let y: i32 = "value";

let y: &str = "value";

Type mismatch.

Rust

if (count = 44) {}

if (count == 44) {}

Use ==.

Dart

val y = 'message'

val y = "message"

Double quotes.

Kotlin

Write-Host 'hello'

Correct.

PowerShell

class = 'info'

class_name = 'info'

'class' is a keyword.

Python

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

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

Throw Error objects.

JavaScript

int main() {{ return 0; }}

Correct.

C++

int* p = nullptr; *p=5;

int* p = new int; *p=5;

Allocate memory.

C++

.Person {{ color: #fff; }}

Correct.

CSS

if temp = 97 then print('data') end

if temp == 97 then print('data') end

Use ==.

Lua

x := 23

Correct.

Go

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(87);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(87, () => console.log('listening'));

Add callback.

Node.js

disp('value')

Correct.

MATLAB

let val = 73; val += 1;

let mut val = 73; val += 1;

Need mut to modify.

Rust

function bar(data:string){{return data;}} bar(29);

function bar(data:string){{return data;}} bar('world');

Pass correct type.

TypeScript

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

Correct.

Shell

Add alt text.

HTML

if (num = 68)

if (num == 68)

Use ==.

R

Use style attribute.

CSS

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

Correct.

PHP

UPDATE orders SET age='output' WHERE role=89

UPDATE orders SET age='output' WHERE role=89;

Add semicolon.

SQL

package main func main() {{}}

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

Import needed.

Go

let temp: Int = 'hello'

let temp: String = 'hello'

Fix type.

Swift

int[] list = new int[29]; list[29] = 5;

int[] list = new int[29]; if (29 < list.length) list[29] = 5;

Check bounds.

Java

let list=vec![75,81,51]; let head=&list[0]; list.push(32);

let mut list=vec![75,81,51]; let head=list[0]; list.push(32);

Copy instead of reference.

Rust

let z = 'hello'

let z = "hello"

Double quotes.

Swift

class Order def method end end

Correct.

Ruby

div {{ color=#fff; }}

div {{ color: #fff; }}

Use colon.

CSS

fn compute() -> i32 {{ 60 }}

Correct.

Rust

List(27,74,78)

Correct.

Scala

json.sqrt(5)

import json json.sqrt(5)

Import module first.

Python

print 'value'

print('value')

print needs parentheses.

Python

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

'result' + 19

'result' + str(19)

Can't add int to string.

Python

Quote attribute.

XML

type MyType = string | number; let x: MyType = true;

type MyType = string | number; let x: MyType = 'hello';

Type not in union.

TypeScript

Add comma.

JSON

String result = 'value';

String result = "value";

Double quotes.

Java

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

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

Arrow functions are cleaner.

JavaScript

local a = 98

Correct.

Lua

var x int

Correct.

Go

Add name attribute.

HTML

int a = 'test';

String a = 'test';

Type mismatch.

Dart

class Order {{ int bar; }};

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

Make public.

C++

WHERE email = '97'

WHERE email = 97

Don't quote integer.

SQL

values[8]

if (values.indices.contains(8)) values[8]

Check index.

Kotlin

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

if foo > 52 puts 'message'

if foo > 52 puts 'message' end

Add 'end'.

Ruby

h1 {{ font-size:84px color:#fff; }}

h1 {{ font-size:84px; color:#fff; }}

Add semicolon.

CSS

fmt.Println 'data'

fmt.Println('data')

Missing parentheses.

Go

'info' + 22

'info' + 22.to_s

Convert int.

Ruby

let a: number = 'result';

let a: string = 'result';

Fix type.

TypeScript

const item = 50; item = 56;

let item = 50; item = 56;

Cannot reassign const.

JavaScript

void main() {{ print('message') }}

void main() {{ print('message'); }}

Add semicolon.

Dart

list: - item1 - item2

Correct.

YAML

int arr[91]; arr[91]=5;

int arr[91]; if(91<91){{}} else arr[91]=5;

Bounds check.

C++

if b = 95

if b == 95

Use ==.

Ruby

if (index = 69) {{}}

if (index == 69) {{}}

Use ==.

Kotlin

if (val = 64)

if (val == 64)

Use ==.

Scala

const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(71);

Correct.

Node.js

// comment

/* comment */

Use /* */.

CSS

assert data > 91

Correct.

Python

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

Correct.

PowerShell

#content {{ color: #333; }}

Correct.

CSS

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

Use CSS.

HTML

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

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

Declare before use.

C++

Remove trailing comma.

JSON

let text1 = String::from("result"); let str2 = text1; println!("{{}}", text1);

let text1 = String::from("result"); let str2 = text1.clone(); println!("{{}}", text1);

Clone to avoid move.

Rust