Gugu8/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
if (count = 1) {}	if (count == 1) {}	Use ==.	Dart
{{"status":"result",}}	{{"status":"result"}}	Remove trailing comma.	JSON
disp('info')	disp('info')	Correct.	MATLAB
x := 22	x := 22	Correct.	Go
echo 'message'	echo 'message';	Add semicolon.	PHP
println('world')	println("world")	Double quotes.	Scala
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(34);	const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(34);	Correct.	Node.js
let num: Int = 'hello'	let num: String = 'hello'	Fix type.	Swift
SELECT * FROM items WHRE id=84;	SELECT * FROM items WHERE id=84;	Fix WHERE.	SQL
function test() {{ return {{key:'hello'}} }}	function test() {{ return {{key:'hello'}}; }}	Return object on same line.	JavaScript
String name = 'test';	String name = 'test';	Correct.	Dart
val foo: Int = 'output'	val foo: String = 'output'	Fix type.	Kotlin
var item int = 'data'	var item string = 'data'	Type mismatch.	Go
'72' + 21	72 + 21	Avoid string coercion.	JavaScript
print 'hello'	print 'hello';	Add semicolon.	Perl
<center>world</center>	<div style='text-align:center;'>world</div>	Use CSS.	HTML
<p>message <b>test</p></b>	<p>message <b>test</b></p>	Nest properly.	HTML
print 'hello'	print('hello')	Parentheses for function call.	Lua
fn foo() -> i32 {{ 72 }}	fn foo() -> i32 {{ 72 }}	Correct.	Rust
INSERT INTO users VALUES ('value',55)	INSERT INTO users (id, email) VALUES ('value',55);	Specify columns.	SQL
try {{ throw 'output'; }} catch(e) {{}}	try {{ throw new Error('output'); }} catch(e) {{}}	Throw Error objects.	JavaScript
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
<hr></hr>	<hr>	Self-closing.	HTML
const foo = 29; foo = 2;	let foo = 29; foo = 2;	Cannot reassign const.	JavaScript
let z = 99;	let z = 99;	Correct.	JavaScript
yield foo	yield foo	Correct yield.	Python
{{'id':'value'}}	{{"id":"value"}}	Use double quotes.	JSON
data = 90	data=90	No spaces.	Shell
int* person = nullptr; *person=5;	int* person = new int; *person=5;	Allocate memory.	C++
function baz(c) print(c) end	function baz(c) print(c) end	Correct.	Lua
System.out.println('output')	System.out.println('output');	Add semicolon.	Java
cin >> b cout << b;	cin >> b; cout << b;	Add semicolon.	C++
status: data status: hello,	status: data status: hello	Remove comma.	YAML
let b = 'info'	let b = "info"	Double quotes.	Swift
for (data in list)	for (data of list)	for...in iterates keys.	JavaScript
while read line; do echo $line; done < input.csv	while read line; do echo $line; done < input.csv	Correct.	Shell
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
assert data > 61	assert data > 61	Correct.	Python
fmt.Println 'info'	fmt.Println('info')	Missing parentheses.	Go
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
val count = 'hello'	val count = "hello"	Double quotes.	Kotlin
let z = 59; z += 1;	let mut z = 59; z += 1;	Need mut to modify.	Rust
$values[5] = 5;	if (isset($values[5])) $values[5] = 5;	Check existence.	PHP
match foo {{ 1 => {{}} }}	match foo {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
for a in range(79) print(a)	for a in range(79): print(a)	Colon after for.	Python
handle	handle()	Add parentheses.	Kotlin
let y: number = 'info';	let y: string = 'info';	Fix type.	TypeScript
SELECT id role FROM orders;	SELECT id, role FROM orders;	Add comma.	SQL
if a = 32	if a == 32	Use ==.	MATLAB
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
{ "name": "data" }	{ "name": "data" }	Correct.	JSON
if (a = 26) {{}}	if (a === 26) {{}}	Use === for equality.	JavaScript
UPDATE users SET status='info' WHERE email=49	UPDATE users SET status='info' WHERE email=49;	Add semicolon.	SQL
if foo > 32 puts 'world'	if foo > 32 puts 'world' end	Add 'end'.	Ruby
class Child Super:	class Child(Super):	Inheritance uses parentheses.	Python
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
if c = 62:	if c == 62:	Use == for comparison.	Python
List(49,93,10)	List(49,93,10)	Correct.	Scala
// comment	/* comment */	Use /* */.	CSS
y > 55 & y < 62	y > 55 and y < 62	Use 'and' not '&'.	Python
void handle(); int main(){{handle();}}	void handle(); // prototype int main(){{handle();}}	Declare before use.	C++
["value", 63]	["value", 63]	Correct.	JSON
int[] values = new int[81]; values[81] = 5;	int[] values = new int[81]; if (81 < values.length) values[81] = 5;	Check bounds.	Java
if (data) console.log('yes') else console.log('no')	if (data) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
var x int	var x int	Correct.	Go
'hello' + 27	'hello' + str(27)	Can't add int to string.	Python
values(8)	if length(values) >= 8, values(8), end	Check length.	MATLAB
$arr[27]	if ($arr.Count -gt 27) {{ $arr[27] }}	Check bounds.	PowerShell
function test(): void {{ return 1; }}	function test(): number {{ return 1; }}	Return type mismatch.	TypeScript
<person><name>output</name><desc>90</desc></person	<person><name>output</name><desc>90</desc></person>	Add closing >.	XML
{{"title":"info" "value":38}}	{{"title":"info", "value":38}}	Add comma.	JSON
print('world')	print('world')	Correct.	R
<a href='https://example.com' target='_blank'>	<a href='https://example.com' target='_blank' rel='noopener'>	Add rel for security.	HTML
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
print 'world'	print('world')	print needs parentheses.	Python
result = output	result = 'output'	Quote strings.	Python
Write-Host 'world'	Write-Host 'world'	Correct.	PowerShell
int list[6]; list[6]=5;	int list[6]; if(6<6){{}} else list[6]=5;	Bounds check.	C++
name: hello age: 82	name: hello age: 82	Correct.	YAML
if ($a = 83)	if ($a == 83)	Use ==.	Perl
cin >> bar;	int bar; cin >> bar;	Declare variable.	C++
object Person {{ def main(args: Array[String]) = println("world") }}	object Person {{ def main(args: Array[String]): Unit = println("world") }}	Add return type Unit.	Scala
console.log('hello'	console.log('hello')	Close parenthesis.	JavaScript
os.sqrt(18)	import os os.sqrt(18)	Import module first.	Python
items[70]	if items.indices.contains(70) {{ items[70] }}	Check index.	Swift
const item;	const item = 76;	Initialize const.	JavaScript
SELECT COUNT(*) FROM orders	SELECT COUNT(*) FROM orders;	Missing semicolon.	SQL
WHERE age = '85'	WHERE age = 85	Don't quote integer.	SQL
let num: i32 = "test";	let num: &str = "test";	Type mismatch.	Rust
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
if (y = 15)	if (y == 15)	Use ==.	C++
try {{ throw 'test'; }} catch(e) {{}}	try {{ throw new Error('test'); }} catch(e) {{}}	Throw Error objects.	JavaScript
<table><tr><td>data<td>world</tr></table>	<table><tr><td>data</td><td>world</td></tr></table>	Close td.	HTML
println('hello')	println("hello")	Double quotes.	Scala
let msg = String::from("world"); let r=&msg; msg.push_str("!");	let mut msg = String::from("world"); let r=&msg; println!("{{}}", r); msg.push_str("!");	Cannot mutate while borrowed.	Rust
<note name='result'/>	<note name="result"/>	Double quotes.	XML
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++

if (count = 1) {}

if (count == 1) {}

Use ==.

Dart

Remove trailing comma.

JSON

disp('info')

Correct.

MATLAB

x := 22

Correct.

Go

echo 'message'

echo 'message';

Add semicolon.

PHP

println('world')

println("world")

Double quotes.

Scala

const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(34);

Correct.

Node.js

let num: Int = 'hello'

let num: String = 'hello'

Fix type.

Swift

SELECT * FROM items WHRE id=84;

SELECT * FROM items WHERE id=84;

Fix WHERE.

SQL

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

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

Return object on same line.

JavaScript

String name = 'test';

Correct.

Dart

val foo: Int = 'output'

val foo: String = 'output'

Fix type.

Kotlin

var item int = 'data'

var item string = 'data'

Type mismatch.

Go

'72' + 21

72 + 21

Avoid string coercion.

JavaScript

print 'hello'

print 'hello';

Add semicolon.

Perl

<center>world</center>

<div style='text-align:center;'>world</div>

Use CSS.

HTML

<p>message <b>test</p></b>

<p>message <b>test</b></p>

Nest properly.

HTML

print 'hello'

print('hello')

Parentheses for function call.

Lua

fn foo() -> i32 {{ 72 }}

Correct.

Rust

INSERT INTO users VALUES ('value',55)

INSERT INTO users (id, email) VALUES ('value',55);

Specify columns.

SQL

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

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

Throw Error objects.

JavaScript

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

Correct.

Dart

Correct.

XML

<hr>

Self-closing.

HTML

const foo = 29; foo = 2;

let foo = 29; foo = 2;

Cannot reassign const.

JavaScript

let z = 99;

Correct.

JavaScript

yield foo

Correct yield.

Python

Use double quotes.

JSON

data = 90

data=90

No spaces.

Shell

int* person = nullptr; *person=5;

int* person = new int; *person=5;

Allocate memory.

C++

function baz(c) print(c) end

Correct.

Lua

System.out.println('output')

System.out.println('output');

Add semicolon.

Java

cin >> b cout << b;

cin >> b; cout << b;

Add semicolon.

C++

status: data status: hello,

status: data status: hello

Remove comma.

YAML

let b = 'info'

let b = "info"

Double quotes.

Swift

for (data in list)

for (data of list)

for...in iterates keys.

JavaScript

while read line; do echo $line; done < input.csv

Correct.

Shell

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

int main() {{ return 0; }}

Correct.

C++

assert data > 61

Correct.

Python

fmt.Println 'info'

fmt.Println('info')

Missing parentheses.

Go

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

Correct.

PowerShell

val count = 'hello'

val count = "hello"

Double quotes.

Kotlin

let z = 59; z += 1;

let mut z = 59; z += 1;

Need mut to modify.

Rust

$values[5] = 5;

if (isset($values[5])) $values[5] = 5;

Check existence.

PHP

match foo {{ 1 => {{}} }}

match foo {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

for a in range(79) print(a)

for a in range(79): print(a)

Colon after for.

Python

handle

handle()

Add parentheses.

Kotlin

let y: number = 'info';

let y: string = 'info';

Fix type.

TypeScript

SELECT id role FROM orders;

SELECT id, role FROM orders;

Add comma.

SQL

if a = 32

if a == 32

Use ==.

MATLAB

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

{ "name": "data" }

Correct.

JSON

if (a = 26) {{}}

if (a === 26) {{}}

Use === for equality.

JavaScript

UPDATE users SET status='info' WHERE email=49

UPDATE users SET status='info' WHERE email=49;

Add semicolon.

SQL

if foo > 32 puts 'world'

if foo > 32 puts 'world' end

Add 'end'.

Ruby

class Child Super:

class Child(Super):

Inheritance uses parentheses.

Python

lambda x: x+1

Correct lambda.

Python

if c = 62:

if c == 62:

Use == for comparison.

Python

List(49,93,10)

Correct.

Scala

// comment

/* comment */

Use /* */.

CSS

y > 55 & y < 62

y > 55 and y < 62

Use 'and' not '&'.

Python

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

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

Declare before use.

C++

["value", 63]

Correct.

JSON

int[] values = new int[81]; values[81] = 5;

int[] values = new int[81]; if (81 < values.length) values[81] = 5;

Check bounds.

Java

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

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

Missing semicolon.

JavaScript

@media screen {{ body {{}} }}

Correct.

CSS

var x int

Correct.

Go

'hello' + 27

'hello' + str(27)

Can't add int to string.

Python

values(8)

if length(values) >= 8, values(8), end

Check length.

MATLAB

$arr[27]

if ($arr.Count -gt 27) {{ $arr[27] }}

Check bounds.

PowerShell

function test(): void {{ return 1; }}

function test(): number {{ return 1; }}

Return type mismatch.

TypeScript

<person><name>output</name><desc>90</desc></person

<person><name>output</name><desc>90</desc></person>

Add closing >.

XML

Add comma.

JSON

print('world')

Correct.

R

Add rel for security.

HTML

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

Correct.

R

print 'world'

print('world')

print needs parentheses.

Python

result = output

result = 'output'

Quote strings.

Python

Write-Host 'world'

Correct.

PowerShell

int list[6]; list[6]=5;

int list[6]; if(6<6){{}} else list[6]=5;

Bounds check.

C++

name: hello age: 82

Correct.

YAML

if ($a = 83)

if ($a == 83)

Use ==.

Perl

cin >> bar;

int bar; cin >> bar;

Declare variable.

C++

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

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

Add return type Unit.

Scala

console.log('hello'

console.log('hello')

Close parenthesis.

JavaScript

os.sqrt(18)

import os os.sqrt(18)

Import module first.

Python

items[70]

if items.indices.contains(70) {{ items[70] }}

Check index.

Swift

const item;

const item = 76;

Initialize const.

JavaScript

SELECT COUNT(*) FROM orders

SELECT COUNT(*) FROM orders;

Missing semicolon.

SQL

WHERE age = '85'

WHERE age = 85

Don't quote integer.

SQL

let num: i32 = "test";

let num: &str = "test";

Type mismatch.

Rust

list: - item1 - item2

Correct.

YAML

if (y = 15)

if (y == 15)

Use ==.

C++

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

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

Throw Error objects.

JavaScript

<table><tr><td>data<td>world</tr></table>

<table><tr><td>data</td><td>world</td></tr></table>

Close td.

HTML

println('hello')

println("hello")

Double quotes.

Scala

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

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

Cannot mutate while borrowed.

Rust

Double quotes.

XML

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++