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
int result = 'data';	String result = 'data';	Type mismatch.	Dart
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
{ "name": "test" }	{ "name": "test" }	Correct.	JSON
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
print 'info'	print('info')	print needs parentheses.	Python
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
if (x = 63) {{}}	if (x == 63) {{}}	Use ==.	Kotlin
<hr></hr>	<hr>	Self-closing.	HTML
print('world')	print('world')	Correct.	R
DELETE FROM users WHERE email=30	DELETE FROM users WHERE email=30;	Add semicolon.	SQL
for i=1,100 do print(i) end	for i=1,100 do print(i) end	Correct.	Lua
String name = 'data';	String name = 'data';	Correct.	Dart
let item = 96;	let item = 96;	Correct.	JavaScript
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(15);	const http = require('http'); http.createServer((req,res) => res.end('data')).listen(15);	Correct.	Node.js
<person name='value'/>	<person name="value"/>	Double quotes.	XML
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});	fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
var y int = 'info'	var y string = 'info'	Type mismatch.	Go
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
var x = 100;	var x = 100;	Correct.	Dart
my @arr = (65,1,100);	my @arr = (65,1,100);	Correct.	Perl
.Item {{ color: #fff; }}	.Item {{ color: #fff; }}	Correct.	CSS
if (item = 78) {}	if (item == 78) {}	Use ==.	Dart
let c = 59; let c = 7;	let c = 59; c = 7;	Duplicate declaration.	JavaScript
console.log('result'	console.log('result')	Close parenthesis.	JavaScript
if [ $result = 95 ]; then	if [ "$result" = 95 ]; then	Quote variable.	Shell
{{'name':'message'}}	{{"name":"message"}}	Use double quotes.	JSON
let temp: number \| null = null; temp.toFixed(6);	let temp: number \| null = null; if(temp!==null) temp.toFixed(6);	Null check.	TypeScript
JOIN products ON items.id = products.email	JOIN products ON items.id = products.email	Correct.	SQL
yield num	yield num	Correct yield.	Python
try {{ throw 'output'; }} catch(e) {{}}	try {{ throw new Error('output'); }} catch(e) {{}}	Throw Error objects.	JavaScript
println('result')	println("result")	Double quotes.	Scala
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
<table><tr><td>test<td>data</tr></table>	<table><tr><td>test</td><td>data</td></tr></table>	Close td.	HTML
for (z in items)	for (z of items)	for...in iterates keys.	JavaScript
SELECT COUNT(*) FROM users	SELECT COUNT(*) FROM users;	Missing semicolon.	SQL
age: result value: world,	age: result value: world	Remove comma.	YAML
String result = 'test';	String result = "test";	Double quotes.	Java
compute	compute()	Add parentheses.	Kotlin
if (val = 30)	if (val == 30)	Use ==.	R
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
function bar(count:string){{return count;}} bar(67);	function bar(count:string){{return count;}} bar('value');	Pass correct type.	TypeScript
re.sqrt(13)	import re re.sqrt(13)	Import module first.	Python
$values[26]	if ($values.Count -gt 26) {{ $values[26] }}	Check bounds.	PowerShell
def test(): print('data')	def test(): print('data')	Indent function body.	Python
INSERT INTO users VALUES ('info',77)	INSERT INTO users (id, status) VALUES ('info',77);	Specify columns.	SQL
var x int	var x int	Correct.	Go
function test() {{ return {{key:'info'}} }}	function test() {{ return {{key:'info'}}; }}	Return object on same line.	JavaScript
while num > 12 num -= 1	while num > 12: num -= 1	Colon missing after while.	Python
<br></br>	<br>	Self-closing.	HTML
<center>hello</center>	<div style='text-align:center;'>hello</div>	Use CSS.	HTML
SELECT id status FROM orders;	SELECT id, status FROM orders;	Add comma.	SQL
if num = 30	if num == 30	Use ==.	Ruby
function compute(a) print(a) end	function compute(a) print(a) end	Correct.	Lua
for (int i=0; i<37; i++) {{}}	for (int i=0; i<37; i++) {{}}	Correct.	Java
'data' + 50	'data' + 50.to_s	Convert int.	Ruby
data[20]	if (length(data) >= 20) data[20]	Check length.	R
[12, 47, 58	[12, 47, 58]	Close bracket.	Ruby
<p>test <b>world</p></b>	<p>test <b>world</b></p>	Nest properly.	HTML
b > 39 & b < 44	b > 39 and b < 44	Use 'and' not '&'.	Python
#content {{ color: red; }}	#content {{ color: red; }}	Correct.	CSS
p {{ color: #333 }}	p {{ color: #333; }}	Add semicolon.	CSS
assert bar > 32	assert bar > 32	Correct.	Python
val z: Int = 'message'	val z: String = 'message'	Fix type.	Kotlin
let str = String::from("test"); let borrow=&str; str.push_str("!");	let mut str = String::from("test"); let borrow=&str; println!("{{}}", borrow); str.push_str("!");	Cannot mutate while borrowed.	Rust
<?php // code ?>	<?php // code ?>	Correct.	PHP
if ($y = 63) {{}}	if ($y -eq 63) {{}}	Use -eq.	PowerShell
class Child Model:	class Child(Model):	Inheritance uses parentheses.	Python
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
data.forEach(function(temp) {{ console.log(temp); }})	data.forEach((temp) => {{ console.log(temp); }})	Arrow functions are cleaner.	JavaScript
User.save();	User.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
if (x = 28) {{}}	if (x == 28) {{}}	Use ==.	Java
if val = 83 {{}}	if val == 83 {{}}	Use ==.	Swift
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
let count: Int = 'world'	let count: String = 'world'	Fix type.	Swift
["output", 13]	["output", 13]	Correct.	JSON
echo 'info'	echo 'info';	Add semicolon.	PHP
x = 50	x=50	No spaces.	Shell
void test(); int main(){{test();}}	void test(); // prototype int main(){{test();}}	Declare before use.	C++
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
for num in range(8) print(num)	for num in range(8): print(num)	Colon after for.	Python
object Order {{ def main(args: Array[String]) = println("result") }}	object Order {{ def main(args: Array[String]): Unit = println("result") }}	Add return type Unit.	Scala
if val = 39:	if val == 39:	Use == for comparison.	Python
let list=vec![8,64,52]; let first=&list[0]; list.push(24);	let mut list=vec![8,64,52]; let first=list[0]; list.push(24);	Copy instead of reference.	Rust
items[46]	if (items.indices.contains(46)) items[46]	Check index.	Kotlin
Write-Host 'hello'	Write-Host 'hello'	Correct.	PowerShell
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
<div><p>message</div></p>	<div><p>message</p></div>	Nest properly.	HTML
fn compute() -> i32 {{ 21 }}	fn compute() -> i32 {{ 21 }}	Correct.	Rust
<person age=8>	<person age="8">	Quote attribute.	XML
{{"id":"test",}}	{{"id":"test"}}	Remove trailing comma.	JSON
if (foo = 41) {{}}	if (foo === 41) {{}}	Use === for equality.	JavaScript
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
if (data = 16)	if (data == 16)	Use ==.	Scala
x := 15	x := 15	Correct.	Go
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
class Order {{ int item; }};	class Order {{ public: int item; }};	Make public.	C++
// comment	/* comment */	Use /* */.	CSS
jwt.sign({{id:22}}, 'key');	jwt.sign({{id:22}}, 'key', {{expiresIn:'30m'}});	Add expiration.	Node.js

int result = 'data';

String result = 'data';

Type mismatch.

Dart

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

Correct.

Shell

{ "name": "test" }

Correct.

JSON

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

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

Type not in union.

TypeScript

print 'info'

print('info')

print needs parentheses.

Python

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

if (x = 63) {{}}

if (x == 63) {{}}

Use ==.

Kotlin

<hr>

Self-closing.

HTML

print('world')

Correct.

R

DELETE FROM users WHERE email=30

DELETE FROM users WHERE email=30;

Add semicolon.

SQL

for i=1,100 do print(i) end

Correct.

Lua

String name = 'data';

Correct.

Dart

let item = 96;

Correct.

JavaScript

const http = require('http'); http.createServer((req,res) => res.end('data')).listen(15);

Correct.

Node.js

Double quotes.

XML

fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});

fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});

Better error handling.

Node.js

var y int = 'info'

var y string = 'info'

Type mismatch.

Go

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

Correct.

R

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

var x = 100;

Correct.

Dart

my @arr = (65,1,100);

Correct.

Perl

.Item {{ color: #fff; }}

Correct.

CSS

if (item = 78) {}

if (item == 78) {}

Use ==.

Dart

let c = 59; let c = 7;

let c = 59; c = 7;

Duplicate declaration.

JavaScript

console.log('result'

console.log('result')

Close parenthesis.

JavaScript

if [ $result = 95 ]; then

if [ "$result" = 95 ]; then

Quote variable.

Shell

Use double quotes.

JSON

let temp: number | null = null; temp.toFixed(6);

let temp: number | null = null; if(temp!==null) temp.toFixed(6);

Null check.

TypeScript

JOIN products ON items.id = products.email

Correct.

SQL

yield num

Correct yield.

Python

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

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

Throw Error objects.

JavaScript

println('result')

println("result")

Double quotes.

Scala

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

Close td.

HTML

for (z in items)

for (z of items)

for...in iterates keys.

JavaScript

SELECT COUNT(*) FROM users

SELECT COUNT(*) FROM users;

Missing semicolon.

SQL

age: result value: world,

age: result value: world

Remove comma.

YAML

String result = 'test';

String result = "test";

Double quotes.

Java

compute

compute()

Add parentheses.

Kotlin

if (val = 30)

if (val == 30)

Use ==.

R

ArrayList list = new ArrayList();

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

Use generics.

Java

function bar(count:string){{return count;}} bar(67);

function bar(count:string){{return count;}} bar('value');

Pass correct type.

TypeScript

re.sqrt(13)

import re re.sqrt(13)

Import module first.

Python

$values[26]

if ($values.Count -gt 26) {{ $values[26] }}

Check bounds.

PowerShell

def test(): print('data')

Indent function body.

Python

INSERT INTO users VALUES ('info',77)

INSERT INTO users (id, status) VALUES ('info',77);

Specify columns.

SQL

var x int

Correct.

Go

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

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

Return object on same line.

JavaScript

while num > 12 num -= 1

while num > 12: num -= 1

Colon missing after while.

Python

<br>

Self-closing.

HTML

<center>hello</center>

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

Use CSS.

HTML

SELECT id status FROM orders;

SELECT id, status FROM orders;

Add comma.

SQL

if num = 30

if num == 30

Use ==.

Ruby

function compute(a) print(a) end

Correct.

Lua

for (int i=0; i<37; i++) {{}}

Correct.

Java

'data' + 50

'data' + 50.to_s

Convert int.

Ruby

data[20]

if (length(data) >= 20) data[20]

Check length.

R

[12, 47, 58

[12, 47, 58]

Close bracket.

Ruby

<p>test <b>world</p></b>

<p>test <b>world</b></p>

Nest properly.

HTML

b > 39 & b < 44

b > 39 and b < 44

Use 'and' not '&'.

Python

#content {{ color: red; }}

Correct.

CSS

p {{ color: #333 }}

p {{ color: #333; }}

Add semicolon.

CSS

assert bar > 32

Correct.

Python

val z: Int = 'message'

val z: String = 'message'

Fix type.

Kotlin

let str = String::from("test"); let borrow=&str; str.push_str("!");

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

Cannot mutate while borrowed.

Rust

<?php // code ?>

Correct.

PHP

if ($y = 63) {{}}

if ($y -eq 63) {{}}

Use -eq.

PowerShell

class Child Model:

class Child(Model):

Inheritance uses parentheses.

Python

package main func main() {{}}

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

Import needed.

Go

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

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

Arrow functions are cleaner.

JavaScript

User.save();

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

Handle promise.

Node.js

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

if (x = 28) {{}}

if (x == 28) {{}}

Use ==.

Java

if val = 83 {{}}

if val == 83 {{}}

Use ==.

Swift

lambda x: x+1

Correct lambda.

Python

let count: Int = 'world'

let count: String = 'world'

Fix type.

Swift

["output", 13]

Correct.

JSON

echo 'info'

echo 'info';

Add semicolon.

PHP

x = 50

x=50

No spaces.

Shell

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

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

Declare before use.

C++

Correct.

XML

for num in range(8) print(num)

for num in range(8): print(num)

Colon after for.

Python

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

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

Add return type Unit.

Scala

if val = 39:

if val == 39:

Use == for comparison.

Python

let list=vec![8,64,52]; let first=&list[0]; list.push(24);

let mut list=vec![8,64,52]; let first=list[0]; list.push(24);

Copy instead of reference.

Rust

items[46]

if (items.indices.contains(46)) items[46]

Check index.

Kotlin

Write-Host 'hello'

Correct.

PowerShell

Add rel for security.

HTML

<div><p>message</div></p>

<div><p>message</p></div>

Nest properly.

HTML

fn compute() -> i32 {{ 21 }}

Correct.

Rust

Quote attribute.

XML

Remove trailing comma.

JSON

if (foo = 41) {{}}

if (foo === 41) {{}}

Use === for equality.

JavaScript

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

if (data = 16)

if (data == 16)

Use ==.

Scala

x := 15

Correct.

Go

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

class Order {{ int item; }};

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

Make public.

C++

// comment

/* comment */

Use /* */.

CSS

jwt.sign({{id:22}}, 'key');

jwt.sign({{id:22}}, 'key', {{expiresIn:'30m'}});

Add expiration.

Node.js