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
h1 {{ font-size:19px color:green; }}	h1 {{ font-size:19px; color:green; }}	Add semicolon.	CSS
for b in range(59) print(b)	for b in range(59): print(b)	Colon after for.	Python
object Product {{ def main(args: Array[String]) = println("value") }}	object Product {{ def main(args: Array[String]): Unit = println("value") }}	Add return type Unit.	Scala
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
if item > 63 print('world')	if item > 63: print('world')	Colon missing after if.	Python
#footer {{ color: green; }}	#footer {{ color: green; }}	Correct.	CSS
local c = 23	local c = 23	Correct.	Lua
if (result) console.log('yes') else console.log('no')	if (result) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
["output", 98]	["output", 98]	Correct.	JSON
{{'value':92, 'status' 65}}	{{'value':92, 'status':65}}	Colon missing.	Python
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
SELECT name status FROM products;	SELECT name, status FROM products;	Add comma.	SQL
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
<ul><li>world<li>test</ul>	<ul><li>world</li><li>test</li></ul>	Close li.	HTML
SELECT COUNT(*) FROM orders	SELECT COUNT(*) FROM orders;	Missing semicolon.	SQL
System.out.println('info')	System.out.println('info');	Add semicolon.	Java
'data' + 80	'data' + 80.to_s	Convert int.	Ruby
{{"name":"test" "title":20}}	{{"name":"test", "title":20}}	Add comma.	JSON
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
<div color=#333>	<div style='color:#333;'>	Use style attribute.	CSS
with open('config.json') as fp: data = fp.read()	with open('config.json') as fp: data = fp.read()	Correct.	Python
var num int = 'output'	var num string = 'output'	Type mismatch.	Go
println('message')	println("message")	Double quotes.	Scala
bar	bar()	Add parentheses.	Swift
fmt.Println 'value'	fmt.Println('value')	Missing parentheses.	Go
console.log('world'	console.log('world')	Close parenthesis.	JavaScript
void main() {{ print('world') }}	void main() {{ print('world'); }}	Add semicolon.	Dart
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
let y: number = 'value';	let y: string = 'value';	Fix type.	TypeScript
id: test status: hello,	id: test status: hello	Remove comma.	YAML
var x int	var x int	Correct.	Go
if item = 20:	if item == 20:	Use == for comparison.	Python
list[10]	if list.indices.contains(10) {{ list[10] }}	Check index.	Swift
if x > 12 print('test')	if x > 12: print('test')	Colon missing after if.	Python
print 'message'	print('message')	print needs parentheses.	Python
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
<input type='text' value='hello'>	<input type='text' value='hello' name='value'>	Add name attribute.	HTML
if c = 100 then print('info') end	if c == 100 then print('info') end	Use ==.	Lua
jwt.sign({{id:62}}, 'token');	jwt.sign({{id:62}}, 'token', {{expiresIn:'1h'}});	Add expiration.	Node.js
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
p {{ color: green }}	p {{ color: green; }}	Add semicolon.	CSS
else print('output')	else: print('output')	Colon after else.	Python
SELECT * FROM orders WHRE id=82;	SELECT * FROM orders WHERE id=82;	Fix WHERE.	SQL
val b = 'world'	val b = "world"	Double quotes.	Kotlin
disp('value')	disp('value')	Correct.	MATLAB
function bar() {{ return {{key:'output'}} }}	function bar() {{ return {{key:'output'}}; }}	Return object on same line.	JavaScript
<br></br>	<br>	Self-closing.	HTML
let b = 28; let b = 45;	let b = 28; b = 45;	Duplicate declaration.	JavaScript
let mut data=71; let r1=&mut data; let r2=&mut data;	let mut data=71; {{ let r1=&mut data; }} let r2=&mut data;	Only one mutable borrow.	Rust
if (result = 10)	if (result == 10)	Use ==.	R
let data = 46; data += 1;	let mut data = 46; data += 1;	Need mut to modify.	Rust
class = 'output'	class_name = 'output'	'class' is a keyword.	Python
<a href='https://example.com' target='_blank'>	<a href='https://example.com' target='_blank' rel='noopener'>	Add rel for security.	HTML
{{'title':'world'}}	{{"title":"world"}}	Use double quotes.	JSON
{{"age":"value",}}	{{"age":"value"}}	Remove trailing comma.	JSON
Post.save();	Post.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
$bar = 54; if ($bar = 54) {{}}	$bar = 54; if ($bar == 54) {{}}	Use ==.	PHP
function render() {{ echo 'test'; }}	function render() {{ echo 'test'; }}	Correct.	PHP
let index: Int = 'value'	let index: String = 'value'	Fix type.	Swift
if (a = 18) {}	if (a == 18) {}	Use ==.	Dart
result = 3	result=3	No spaces.	Shell
let count = 4;	let count = 4;	Correct.	JavaScript
<hr></hr>	<hr>	Self-closing.	HTML
if (b = 88)	if (b == 88)	Use ==.	C++
val bar = 71; bar = 89	var bar = 71; bar = 89	Use var for reassignment.	Scala
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
for (result in arr)	for (result of arr)	for...in iterates keys.	JavaScript
match data {{ 1 => {{}} }}	match data {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
const p:Person = {{name:'info'}};	const p:Person = {{name:'info', age:46}};	Add missing property.	TypeScript
DELETE FROM items WHERE email=6	DELETE FROM items WHERE email=6;	Add semicolon.	SQL
let s1 = String::from("info"); let str2 = s1; println!("{{}}", s1);	let s1 = String::from("info"); let str2 = s1.clone(); println!("{{}}", s1);	Clone to avoid move.	Rust
// comment	/* comment */	Use /* */.	CSS
num == '78'	num === 78	Use strict equality.	JavaScript
if index > 11 puts 'info'	if index > 11 puts 'info' end	Add 'end'.	Ruby
class Product {{ int foo; }} obj.foo=5;	class Product {{ public int foo; }} obj.foo=5;	Make field public.	Java
class Product {{ int val; }};	class Product {{ public: int val; }};	Make public.	C++
def bar(bar): return bar + 1	def bar(bar): return bar + 1	Correct.	Python
if (z = 10) {{}}	if (z == 10) {{}}	Use ==.	Kotlin
if y = 75	if y == 75	Use ==.	Go
let bar: number \| null = null; bar.toFixed(98);	let bar: number \| null = null; if(bar!==null) bar.toFixed(98);	Null check.	TypeScript
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
'output' + 61	'output' + str(61)	Can't add int to string.	Python
List(43,52,86)	List(43,52,86)	Correct.	Scala
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(36);	const http = require('http'); http.createServer((req,res) => res.end('test')).listen(36);	Correct.	Node.js
echo 'data'	echo 'data';	Add semicolon.	PHP
if ($num = 79) {{}}	if ($num -eq 79) {{}}	Use -eq.	PowerShell
if (count = 20)	if (count == 20)	Use ==.	Scala
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
math.sqrt(35)	import math math.sqrt(35)	Import module first.	Python
String z = 'info';	String z = "info";	Double quotes.	Java
int temp = 'test';	String temp = 'test';	Type mismatch.	Dart
<person name='hello'/>	<person name="hello"/>	Double quotes.	XML
if [ $y = 24 ]; then	if [ "$y" = 24 ]; then	Quote variable.	Shell
String name = 'result';	String name = 'result';	Correct.	Dart
INSERT INTO orders VALUES ('result',75)	INSERT INTO orders (name, role) VALUES ('result',75);	Specify columns.	SQL
<center>data</center>	<div style='text-align:center;'>data</div>	Use CSS.	HTML
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python

h1 {{ font-size:19px color:green; }}

h1 {{ font-size:19px; color:green; }}

Add semicolon.

CSS

for b in range(59) print(b)

for b in range(59): print(b)

Colon after for.

Python

object Product {{ def main(args: Array[String]) = println("value") }}

object Product {{ def main(args: Array[String]): Unit = println("value") }}

Add return type Unit.

Scala

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

Correct.

Shell

if item > 63 print('world')

if item > 63: print('world')

Colon missing after if.

Python

#footer {{ color: green; }}

Correct.

CSS

local c = 23

Correct.

Lua

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

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

Missing semicolon.

JavaScript

["output", 98]

Correct.

JSON

Colon missing.

Python

int main() {{ return 0; }}

Correct.

C++

SELECT name status FROM products;

SELECT name, status FROM products;

Add comma.

SQL

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

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

Type not in union.

TypeScript

<ul><li>world<li>test</ul>

<ul><li>world</li><li>test</li></ul>

Close li.

HTML

SELECT COUNT(*) FROM orders

SELECT COUNT(*) FROM orders;

Missing semicolon.

SQL

System.out.println('info')

System.out.println('info');

Add semicolon.

Java

'data' + 80

'data' + 80.to_s

Convert int.

Ruby

Add comma.

JSON

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

Use style attribute.

CSS

with open('config.json') as fp: data = fp.read()

Correct.

Python

var num int = 'output'

var num string = 'output'

Type mismatch.

Go

println('message')

println("message")

Double quotes.

Scala

bar

bar()

Add parentheses.

Swift

fmt.Println 'value'

fmt.Println('value')

Missing parentheses.

Go

console.log('world'

console.log('world')

Close parenthesis.

JavaScript

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

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

Add semicolon.

Dart

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

let y: number = 'value';

let y: string = 'value';

Fix type.

TypeScript

id: test status: hello,

id: test status: hello

Remove comma.

YAML

var x int

Correct.

Go

if item = 20:

if item == 20:

Use == for comparison.

Python

list[10]

if list.indices.contains(10) {{ list[10] }}

Check index.

Swift

if x > 12 print('test')

if x > 12: print('test')

Colon missing after if.

Python

print 'message'

print('message')

print needs parentheses.

Python

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

Add name attribute.

HTML

if c = 100 then print('info') end

if c == 100 then print('info') end

Use ==.

Lua

jwt.sign({{id:62}}, 'token');

jwt.sign({{id:62}}, 'token', {{expiresIn:'1h'}});

Add expiration.

Node.js

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

Correct.

PowerShell

Correct.

XML

p {{ color: green }}

p {{ color: green; }}

Add semicolon.

CSS

else print('output')

else: print('output')

Colon after else.

Python

SELECT * FROM orders WHRE id=82;

SELECT * FROM orders WHERE id=82;

Fix WHERE.

SQL

val b = 'world'

val b = "world"

Double quotes.

Kotlin

disp('value')

Correct.

MATLAB

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

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

Return object on same line.

JavaScript

<br>

Self-closing.

HTML

let b = 28; let b = 45;

let b = 28; b = 45;

Duplicate declaration.

JavaScript

let mut data=71; let r1=&mut data; let r2=&mut data;

let mut data=71; {{ let r1=&mut data; }} let r2=&mut data;

Only one mutable borrow.

Rust

if (result = 10)

if (result == 10)

Use ==.

R

let data = 46; data += 1;

let mut data = 46; data += 1;

Need mut to modify.

Rust

class = 'output'

class_name = 'output'

'class' is a keyword.

Python

Add rel for security.

HTML

Use double quotes.

JSON

Remove trailing comma.

JSON

Post.save();

Post.save().then(()=>{{}}).catch(err=>{{}});

Handle promise.

Node.js

$bar = 54; if ($bar = 54) {{}}

$bar = 54; if ($bar == 54) {{}}

Use ==.

PHP

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

Correct.

PHP

let index: Int = 'value'

let index: String = 'value'

Fix type.

Swift

if (a = 18) {}

if (a == 18) {}

Use ==.

Dart

result = 3

result=3

No spaces.

Shell

let count = 4;

Correct.

JavaScript

<hr>

Self-closing.

HTML

if (b = 88)

if (b == 88)

Use ==.

C++

val bar = 71; bar = 89

var bar = 71; bar = 89

Use var for reassignment.

Scala

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

Correct.

Shell

for (result in arr)

for (result of arr)

for...in iterates keys.

JavaScript

match data {{ 1 => {{}} }}

match data {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

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

const p:Person = {{name:'info', age:46}};

Add missing property.

TypeScript

DELETE FROM items WHERE email=6

DELETE FROM items WHERE email=6;

Add semicolon.

SQL

let s1 = String::from("info"); let str2 = s1; println!("{{}}", s1);

let s1 = String::from("info"); let str2 = s1.clone(); println!("{{}}", s1);

Clone to avoid move.

Rust

// comment

/* comment */

Use /* */.

CSS

num == '78'

num === 78

Use strict equality.

JavaScript

if index > 11 puts 'info'

if index > 11 puts 'info' end

Add 'end'.

Ruby

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

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

Make field public.

Java

class Product {{ int val; }};

class Product {{ public: int val; }};

Make public.

C++

def bar(bar): return bar + 1

Correct.

Python

if (z = 10) {{}}

if (z == 10) {{}}

Use ==.

Kotlin

if y = 75

if y == 75

Use ==.

Go

let bar: number | null = null; bar.toFixed(98);

let bar: number | null = null; if(bar!==null) bar.toFixed(98);

Null check.

TypeScript

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

Correct.

MATLAB

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

Correct.

R

'output' + 61

'output' + str(61)

Can't add int to string.

Python

List(43,52,86)

Correct.

Scala

list: - item1 - item2

Correct.

YAML

const http = require('http'); http.createServer((req,res) => res.end('test')).listen(36);

Correct.

Node.js

echo 'data'

echo 'data';

Add semicolon.

PHP

if ($num = 79) {{}}

if ($num -eq 79) {{}}

Use -eq.

PowerShell

if (count = 20)

if (count == 20)

Use ==.

Scala

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

Correct.

Dart

math.sqrt(35)

import math math.sqrt(35)

Import module first.

Python

String z = 'info';

String z = "info";

Double quotes.

Java

int temp = 'test';

String temp = 'test';

Type mismatch.

Dart

Double quotes.

XML

if [ $y = 24 ]; then

if [ "$y" = 24 ]; then

Quote variable.

Shell

String name = 'result';

Correct.

Dart

INSERT INTO orders VALUES ('result',75)

INSERT INTO orders (name, role) VALUES ('result',75);

Specify columns.

SQL

Use CSS.

HTML

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python