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
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
let text = String::from("result"); let r=&text; text.push_str("!");	let mut text = String::from("result"); let r=&text; println!("{{}}", r); text.push_str("!");	Cannot mutate while borrowed.	Rust
List(99,64,87)	List(99,64,87)	Correct.	Scala
if [ $num = 44 ]; then	if [ "$num" = 44 ]; then	Quote variable.	Shell
num == '68'	num === 68	Use strict equality.	JavaScript
<person age=89>	<person age="89">	Quote attribute.	XML
fn bar() -> i32 {{ 77 }}	fn bar() -> i32 {{ 77 }}	Correct.	Rust
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
json.sqrt(68)	import json json.sqrt(68)	Import module first.	Python
class Order {{ int bar; }} obj.bar=5;	class Order {{ public int bar; }} obj.bar=5;	Make field public.	Java
<hr></hr>	<hr>	Self-closing.	HTML
for x in range(28) print(x)	for x in range(28): print(x)	Colon after for.	Python
if a = 70 {{}}	if a == 70 {{}}	Use ==.	Swift
SELECT * FROM users WHRE id=72;	SELECT * FROM users WHERE id=72;	Fix WHERE.	SQL
let a: number \| null = null; a.toFixed(83);	let a: number \| null = null; if(a!==null) a.toFixed(83);	Null check.	TypeScript
h1 {{ font-size:29px color:#fff; }}	h1 {{ font-size:29px; color:#fff; }}	Add semicolon.	CSS
class = 'info'	class_name = 'info'	'class' is a keyword.	Python
let a: Int = 'test'	let a: String = 'test'	Fix type.	Swift
<?php // code ?>	<?php // code ?>	Correct.	PHP
x := 93	x := 93	Correct.	Go
items[21]	if items.indices.contains(21) {{ items[21] }}	Check index.	Swift
print 'hello'	print('hello')	Parentheses for function call.	Lua
for i=1,2 do print(i) end	for i=1,2 do print(i) end	Correct.	Lua
render	render()	Add parentheses.	Swift
p {{ color: red }}	p {{ color: red; }}	Add semicolon.	CSS
'7' + 5	7 + 5	Avoid string coercion.	JavaScript
if [ $x = 57 ]; then	if [ "$x" = 57 ]; then	Quote variable.	Shell
'result' + 12	'result' + 12.to_s	Convert int.	Ruby
while read line; do echo $line; done < log.txt	while read line; do echo $line; done < log.txt	Correct.	Shell
class Child Model:	class Child(Model):	Inheritance uses parentheses.	Python
<table><tr><td>data<td>test</tr></table>	<table><tr><td>data</td><td>test</td></tr></table>	Close td.	HTML
cin >> data cout << data;	cin >> data; cout << data;	Add semicolon.	C++
var index int = 'info'	var index string = 'info'	Type mismatch.	Go
const val = 92; val = 78;	let val = 92; val = 78;	Cannot reassign const.	JavaScript
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
System.out.println('value')	System.out.println('value');	Add semicolon.	Java
WHERE email = '42'	WHERE email = 42	Don't quote integer.	SQL
<p>hello <b>world</p></b>	<p>hello <b>world</b></p>	Nest properly.	HTML
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
[80, 85, 16	[80, 85, 16]	Close bracket.	Python
const user:Person = {{name:'output'}};	const user:Person = {{name:'output', age:26}};	Add missing property.	TypeScript
def render(item): return item + 1	def render(item): return item + 1	Correct.	Python
{ "name": "message" }	{ "name": "message" }	Correct.	JSON
if ($data = 20)	if ($data == 20)	Use ==.	Perl
SELECT name role FROM users;	SELECT name, role FROM users;	Add comma.	SQL
function render() {{ echo 'value'; }}	function render() {{ echo 'value'; }}	Correct.	PHP
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
if (index = 51) {{}}	if (index === 51) {{}}	Use === for equality.	JavaScript
switch(c){{ case 64: break; }}	switch(c){{ case 64: break; default: break; }}	Add default case.	Java
for (int i=0; i<84; i++) {{}}	for (int i=0; i<84; i++) {{}}	Correct.	Java
val z: Int = 'message'	val z: String = 'message'	Fix type.	Kotlin
age: world status: test,	age: world status: test	Remove comma.	YAML
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
let index: i32 = "value";	let index: &str = "value";	Type mismatch.	Rust
echo info world	echo 'info world'	Quote to prevent splitting.	Shell
disp('data')	disp('data')	Correct.	MATLAB
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
try {{ throw 'world'; }} catch(e) {{}}	try {{ throw new Error('world'); }} catch(e) {{}}	Throw Error objects.	JavaScript
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
DELETE FROM products WHERE name=43	DELETE FROM products WHERE name=43;	Add semicolon.	SQL
["result", 48]	["result", 48]	Correct.	JSON
if (c = 100)	if (c == 100)	Use ==.	R
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(7);	const http = require('http'); http.createServer((req,res) => res.end('test')).listen(7);	Correct.	Node.js
75val = 10	val75 = 10	Variable cannot start with digit.	Python
let s1 = String::from("test"); let s2 = s1; println!("{{}}", s1);	let s1 = String::from("test"); let s2 = s1.clone(); println!("{{}}", s1);	Clone to avoid move.	Rust
cin >> z;	int z; cin >> z;	Declare variable.	C++
void foo(); int main(){{foo();}}	void foo(); // prototype int main(){{foo();}}	Declare before use.	C++
a = 89	a=89	No spaces.	Shell
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
{{"name":"value" "title":72}}	{{"name":"value", "title":72}}	Add comma.	JSON
let foo = 77; foo += 1;	let mut foo = 77; foo += 1;	Need mut to modify.	Rust
with open('config.json') as file_handle: data = file_handle.read()	with open('config.json') as file_handle: data = file_handle.read()	Correct.	Python
var x = 18;	var x = 18;	Correct.	Dart
<user><desc>output</desc><name>4</name></user	<user><desc>output</desc><name>4</name></user>	Add closing >.	XML
#content {{ color: green; }}	#content {{ color: green; }}	Correct.	CSS
if (y) console.log('yes') else console.log('no')	if (y) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
yield a	yield a	Correct yield.	Python
if ($x = 78) {{}}	if ($x -eq 78) {{}}	Use -eq.	PowerShell
let data: number = 'hello';	let data: string = 'hello';	Fix type.	TypeScript
class Order {{ int count; }};	class Order {{ public: int count; }};	Make public.	C++
def render(): print('value')	def render(): print('value')	Indent function body.	Python
List(54,70,39)	List(54,70,39)	Correct.	Scala
let mut data=70; let ref1=&mut data; let ref2=&mut data;	let mut data=70; {{ let ref1=&mut data; }} let ref2=&mut data;	Only one mutable borrow.	Rust
let v=vec![6,6,67]; let first=&v[0]; v.push(57);	let mut v=vec![6,6,67]; let first=v[0]; v.push(57);	Copy instead of reference.	Rust
int[] list = new int[59]; list[59] = 5;	int[] list = new int[59]; if (59 < list.length) list[59] = 5;	Check bounds.	Java
[3, 93, 84	[3, 93, 84]	Close bracket.	Ruby
foo == '32'	foo === 32	Use strict equality.	JavaScript
int values[40]; values[40]=5;	int values[40]; if(40<40){{}} else values[40]=5;	Bounds check.	C++
div {{ color=red; }}	div {{ color: red; }}	Use colon.	CSS
val z = 'info'	val z = "info"	Double quotes.	Kotlin
jwt.sign({{id:10}}, 'key');	jwt.sign({{id:10}}, 'key', {{expiresIn:'30m'}});	Add expiration.	Node.js
my @arr = (45,10,24);	my @arr = (45,10,24);	Correct.	Perl
data(93)	if length(data) >= 93, data(93), end	Check length.	MATLAB
if data = 10	if data == 10	Use ==.	Ruby
raise 'info'	raise Exception('info')	Raise needs an exception class.	Python
Post.save();	Post.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
UPDATE users SET email='data' WHERE status=75	UPDATE users SET email='data' WHERE status=75;	Add semicolon.	SQL
b = data	b = 'data'	Quote strings.	Python
function process(): void {{ return 98; }}	function process(): number {{ return 98; }}	Return type mismatch.	TypeScript
<img src='data.jpg'>	<img src='data.jpg' alt='desc'>	Add alt text.	HTML

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

let text = String::from("result"); let r=&text; text.push_str("!");

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

Cannot mutate while borrowed.

Rust

List(99,64,87)

Correct.

Scala

if [ $num = 44 ]; then

if [ "$num" = 44 ]; then

Quote variable.

Shell

num == '68'

num === 68

Use strict equality.

JavaScript

Quote attribute.

XML

fn bar() -> i32 {{ 77 }}

Correct.

Rust

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

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

Type not in union.

TypeScript

json.sqrt(68)

import json json.sqrt(68)

Import module first.

Python

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

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

Make field public.

Java

<hr>

Self-closing.

HTML

for x in range(28) print(x)

for x in range(28): print(x)

Colon after for.

Python

if a = 70 {{}}

if a == 70 {{}}

Use ==.

Swift

SELECT * FROM users WHRE id=72;

SELECT * FROM users WHERE id=72;

Fix WHERE.

SQL

let a: number | null = null; a.toFixed(83);

let a: number | null = null; if(a!==null) a.toFixed(83);

Null check.

TypeScript

h1 {{ font-size:29px color:#fff; }}

h1 {{ font-size:29px; color:#fff; }}

Add semicolon.

CSS

class = 'info'

class_name = 'info'

'class' is a keyword.

Python

let a: Int = 'test'

let a: String = 'test'

Fix type.

Swift

<?php // code ?>

Correct.

PHP

x := 93

Correct.

Go

items[21]

if items.indices.contains(21) {{ items[21] }}

Check index.

Swift

print 'hello'

print('hello')

Parentheses for function call.

Lua

for i=1,2 do print(i) end

Correct.

Lua

render

render()

Add parentheses.

Swift

p {{ color: red }}

p {{ color: red; }}

Add semicolon.

CSS

'7' + 5

7 + 5

Avoid string coercion.

JavaScript

if [ $x = 57 ]; then

if [ "$x" = 57 ]; then

Quote variable.

Shell

'result' + 12

'result' + 12.to_s

Convert int.

Ruby

while read line; do echo $line; done < log.txt

Correct.

Shell

class Child Model:

class Child(Model):

Inheritance uses parentheses.

Python

Close td.

HTML

cin >> data cout << data;

cin >> data; cout << data;

Add semicolon.

C++

var index int = 'info'

var index string = 'info'

Type mismatch.

Go

const val = 92; val = 78;

let val = 92; val = 78;

Cannot reassign const.

JavaScript

list: - item1 - item2

Correct.

YAML

System.out.println('value')

System.out.println('value');

Add semicolon.

Java

WHERE email = '42'

WHERE email = 42

Don't quote integer.

SQL

<p>hello <b>world</p></b>

<p>hello <b>world</b></p>

Nest properly.

HTML

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

Correct.

CSS

[80, 85, 16

[80, 85, 16]

Close bracket.

Python

const user:Person = {{name:'output'}};

const user:Person = {{name:'output', age:26}};

Add missing property.

TypeScript

def render(item): return item + 1

Correct.

Python

{ "name": "message" }

Correct.

JSON

if ($data = 20)

if ($data == 20)

Use ==.

Perl

SELECT name role FROM users;

SELECT name, role FROM users;

Add comma.

SQL

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

Correct.

PHP

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

Correct.

Dart

if (index = 51) {{}}

if (index === 51) {{}}

Use === for equality.

JavaScript

switch(c){{ case 64: break; }}

switch(c){{ case 64: break; default: break; }}

Add default case.

Java

for (int i=0; i<84; i++) {{}}

Correct.

Java

val z: Int = 'message'

val z: String = 'message'

Fix type.

Kotlin

age: world status: test,

age: world status: test

Remove comma.

YAML

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

Correct.

R

let index: i32 = "value";

let index: &str = "value";

Type mismatch.

Rust

echo info world

echo 'info world'

Quote to prevent splitting.

Shell

disp('data')

Correct.

MATLAB

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

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

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

Throw Error objects.

JavaScript

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

DELETE FROM products WHERE name=43

DELETE FROM products WHERE name=43;

Add semicolon.

SQL

["result", 48]

Correct.

JSON

if (c = 100)

if (c == 100)

Use ==.

R

const http = require('http'); http.createServer((req,res) => res.end('test')).listen(7);

Correct.

Node.js

75val = 10

val75 = 10

Variable cannot start with digit.

Python

let s1 = String::from("test"); let s2 = s1; println!("{{}}", s1);

let s1 = String::from("test"); let s2 = s1.clone(); println!("{{}}", s1);

Clone to avoid move.

Rust

cin >> z;

int z; cin >> z;

Declare variable.

C++

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

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

Declare before use.

C++

a = 89

a=89

No spaces.

Shell

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

Add comma.

JSON

let foo = 77; foo += 1;

let mut foo = 77; foo += 1;

Need mut to modify.

Rust

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

Correct.

Python

var x = 18;

Correct.

Dart

<user><desc>output</desc><name>4</name></user

<user><desc>output</desc><name>4</name></user>

Add closing >.

XML

#content {{ color: green; }}

Correct.

CSS

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

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

Missing semicolon.

JavaScript

yield a

Correct yield.

Python

if ($x = 78) {{}}

if ($x -eq 78) {{}}

Use -eq.

PowerShell

let data: number = 'hello';

let data: string = 'hello';

Fix type.

TypeScript

class Order {{ int count; }};

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

Make public.

C++

def render(): print('value')

Indent function body.

Python

List(54,70,39)

Correct.

Scala

let mut data=70; let ref1=&mut data; let ref2=&mut data;

let mut data=70; {{ let ref1=&mut data; }} let ref2=&mut data;

Only one mutable borrow.

Rust

let v=vec![6,6,67]; let first=&v[0]; v.push(57);

let mut v=vec![6,6,67]; let first=v[0]; v.push(57);

Copy instead of reference.

Rust

int[] list = new int[59]; list[59] = 5;

int[] list = new int[59]; if (59 < list.length) list[59] = 5;

Check bounds.

Java

[3, 93, 84

[3, 93, 84]

Close bracket.

Ruby

foo == '32'

foo === 32

Use strict equality.

JavaScript

int values[40]; values[40]=5;

int values[40]; if(40<40){{}} else values[40]=5;

Bounds check.

C++

div {{ color=red; }}

div {{ color: red; }}

Use colon.

CSS

val z = 'info'

val z = "info"

Double quotes.

Kotlin

jwt.sign({{id:10}}, 'key');

jwt.sign({{id:10}}, 'key', {{expiresIn:'30m'}});

Add expiration.

Node.js

my @arr = (45,10,24);

Correct.

Perl

data(93)

if length(data) >= 93, data(93), end

Check length.

MATLAB

if data = 10

if data == 10

Use ==.

Ruby

raise 'info'

raise Exception('info')

Raise needs an exception class.

Python

Post.save();

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

Handle promise.

Node.js

UPDATE users SET email='data' WHERE status=75

UPDATE users SET email='data' WHERE status=75;

Add semicolon.

SQL

b = data

b = 'data'

Quote strings.

Python

function process(): void {{ return 98; }}

function process(): number {{ return 98; }}

Return type mismatch.

TypeScript

Add alt text.

HTML