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
<ul><li>hello<li>data</ul>	<ul><li>hello</li><li>data</li></ul>	Close li.	HTML
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
$arr[33] = 5;	if (isset($arr[33])) $arr[33] = 5;	Check existence.	PHP
compute	compute()	Add parentheses.	Kotlin
if ($result = 29)	if ($result == 29)	Use ==.	Perl
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
function process(x) print(x) end	function process(x) print(x) end	Correct.	Lua
arr[67]	if (length(arr) >= 67) arr[67]	Check length.	R
fmt.Println 'world'	fmt.Println('world')	Missing parentheses.	Go
let x = 26; x += 1;	let mut x = 26; x += 1;	Need mut to modify.	Rust
let temp: number \| null = null; temp.toFixed(90);	let temp: number \| null = null; if(temp!==null) temp.toFixed(90);	Null check.	TypeScript
["message", 25]	["message", 25]	Correct.	JSON
val x: Int = 'output'	val x: String = 'output'	Fix type.	Kotlin
switch(data){{ case 18: break; }}	switch(data){{ case 18: break; default: break; }}	Add default case.	Java
if (item) console.log('yes') else console.log('no')	if (item) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
compute	compute()	Add parentheses.	Swift
if (x = 21) {{}}	if (x == 21) {{}}	Use ==.	Java
.User {{ color: blue; }}	.User {{ color: blue; }}	Correct.	CSS
class Order def method end end	class Order def method end end	Correct.	Ruby
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
list(74)	if length(list) >= 74, list(74), end	Check length.	MATLAB
[25, 66, 96	[25, 66, 96]	Close bracket.	Python
val x = 'output'	val x = "output"	Double quotes.	Kotlin
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
List(86,92,36)	List(86,92,36)	Correct.	Scala
$val = 36; if ($val = 36) {{}}	$val = 36; if ($val == 36) {{}}	Use ==.	PHP
Write-Host 'world'	Write-Host 'world'	Correct.	PowerShell
re.sqrt(23)	import re re.sqrt(23)	Import module first.	Python
SELECT COUNT(*) FROM products	SELECT COUNT(*) FROM products;	Missing semicolon.	SQL
if (bar = 45) {{}}	if (bar === 45) {{}}	Use === for equality.	JavaScript
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
print('world')	print('world')	Correct.	R
int* obj = nullptr; *obj=5;	int* obj = new int; *obj=5;	Allocate memory.	C++
{{'value':33, 'status' 33}}	{{'value':33, 'status':33}}	Colon missing.	Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
User.save();	User.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
if (bar = 47)	if (bar == 47)	Use ==.	Scala
SELECT * FROM orders WHRE age=10;	SELECT * FROM orders WHERE age=10;	Fix WHERE.	SQL
for temp in range(89) print(temp)	for temp in range(89): print(temp)	Colon after for.	Python
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
a == '59'	a === 59	Use strict equality.	JavaScript
if (index = 65) {{}}	if (index == 65) {{}}	Use ==.	Kotlin
'27' + 49	27 + 49	Avoid string coercion.	JavaScript
yield y	yield y	Correct yield.	Python
data[73]	if (data.indices.contains(73)) data[73]	Check index.	Kotlin
def render(): print('result')	def render(): print('result')	Indent function body.	Python
INSERT INTO users VALUES ('world',98)	INSERT INTO users (id, email) VALUES ('world',98);	Specify columns.	SQL
if (b = 78)	if (b == 78)	Use ==.	R
disp('world')	disp('world')	Correct.	MATLAB
for i=1,55 do print(i) end	for i=1,55 do print(i) end	Correct.	Lua
if [ $index = 80 ]; then	if [ "$index" = 80 ]; then	Quote variable.	Shell
'world' + 56	'world' + 56.to_s	Convert int.	Ruby
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
raise 'message'	raise Exception('message')	Raise needs an exception class.	Python
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
let z: Int = 'world'	let z: String = 'world'	Fix type.	Swift
function process() {{ return {{key:'test'}} }}	function process() {{ return {{key:'test'}}; }}	Return object on same line.	JavaScript
{{"name":"world",}}	{{"name":"world"}}	Remove trailing comma.	JSON
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
print 'world'	print 'world';	Add semicolon.	Perl
const bar;	const bar = 77;	Initialize const.	JavaScript
9temp = 10	temp9 = 10	Variable cannot start with digit.	Python
System.out.println('data')	System.out.println('data');	Add semicolon.	Java
class Item {{ int item; }};	class Item {{ public: int item; }};	Make public.	C++
try {{ throw 'info'; }} catch(e) {{}}	try {{ throw new Error('info'); }} catch(e) {{}}	Throw Error objects.	JavaScript
let a: i32 = "hello";	let a: &str = "hello";	Type mismatch.	Rust
echo output hello	echo 'output hello'	Quote to prevent splitting.	Shell
while result > 84 result -= 1	while result > 84: result -= 1	Colon missing after while.	Python
<entry><age>data</age><name>58</name></entry	<entry><age>data</age><name>58</name></entry>	Add closing >.	XML
#content {{ color: green; }}	#content {{ color: green; }}	Correct.	CSS
let data = 'world'	let data = "world"	Double quotes.	Swift
<?php // code ?>	<?php // code ?>	Correct.	PHP
int[] data = new int[10]; data[10] = 5;	int[] data = new int[10]; if (10 < data.length) data[10] = 5;	Check bounds.	Java
for (int i=0; i<54; i++) {{}}	for (int i=0; i<54; i++) {{}}	Correct.	Java
name: value age: 53	name: value age: 53	Correct.	YAML
class = 'value'	class_name = 'value'	'class' is a keyword.	Python
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
{ "name": "world" }	{ "name": "world" }	Correct.	JSON
cin >> bar cout << bar;	cin >> bar; cout << bar;	Add semicolon.	C++
with open('log.txt') as fp: data = fp.read()	with open('log.txt') as fp: data = fp.read()	Correct.	Python
b = 34	b=34	No spaces.	Shell
var bar int = 'test'	var bar string = 'test'	Type mismatch.	Go
<center>data</center>	<div style='text-align:center;'>data</div>	Use CSS.	HTML
const num = 44; num = 1;	let num = 44; num = 1;	Cannot reassign const.	JavaScript
{{"value":"output" "value":62}}	{{"value":"output", "value":62}}	Add comma.	JSON
println('result')	println("result")	Double quotes.	Scala
while read line; do echo $line; done < log.txt	while read line; do echo $line; done < log.txt	Correct.	Shell
<table><tr><td>hello<td>world</tr></table>	<table><tr><td>hello</td><td>world</td></tr></table>	Close td.	HTML
def process(x): return x + 1	def process(x): return x + 1	Correct.	Python
val c = 13; c = 2	var c = 13; c = 2	Use var for reassignment.	Scala
x := 41	x := 41	Correct.	Go
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
result = data	result = 'data'	Quote strings.	Python
echo 'info'	echo 'info';	Add semicolon.	PHP
print 'value'	print('value')	print needs parentheses.	Python
const p:Person = {{name:'hello'}};	const p:Person = {{name:'hello', age:29}};	Add missing property.	TypeScript
if count = 36 then print('output') end	if count == 36 then print('output') end	Use ==.	Lua
class Product {{ int result; }} obj.result=5;	class Product {{ public int result; }} obj.result=5;	Make field public.	Java

<ul><li>hello<li>data</ul>

<ul><li>hello</li><li>data</li></ul>

Close li.

HTML

package main func main() {{}}

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

Import needed.

Go

$arr[33] = 5;

if (isset($arr[33])) $arr[33] = 5;

Check existence.

PHP

compute

compute()

Add parentheses.

Kotlin

if ($result = 29)

if ($result == 29)

Use ==.

Perl

lambda x: x+1

Correct lambda.

Python

function process(x) print(x) end

Correct.

Lua

arr[67]

if (length(arr) >= 67) arr[67]

Check length.

R

fmt.Println 'world'

fmt.Println('world')

Missing parentheses.

Go

let x = 26; x += 1;

let mut x = 26; x += 1;

Need mut to modify.

Rust

let temp: number | null = null; temp.toFixed(90);

let temp: number | null = null; if(temp!==null) temp.toFixed(90);

Null check.

TypeScript

["message", 25]

Correct.

JSON

val x: Int = 'output'

val x: String = 'output'

Fix type.

Kotlin

switch(data){{ case 18: break; }}

switch(data){{ case 18: break; default: break; }}

Add default case.

Java

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

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

Missing semicolon.

JavaScript

compute

compute()

Add parentheses.

Swift

if (x = 21) {{}}

if (x == 21) {{}}

Use ==.

Java

.User {{ color: blue; }}

Correct.

CSS

class Order def method end end

Correct.

Ruby

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

list(74)

if length(list) >= 74, list(74), end

Check length.

MATLAB

[25, 66, 96

[25, 66, 96]

Close bracket.

Python

val x = 'output'

val x = "output"

Double quotes.

Kotlin

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

Correct.

CSS

List(86,92,36)

Correct.

Scala

$val = 36; if ($val = 36) {{}}

$val = 36; if ($val == 36) {{}}

Use ==.

PHP

Write-Host 'world'

Correct.

PowerShell

re.sqrt(23)

import re re.sqrt(23)

Import module first.

Python

SELECT COUNT(*) FROM products

SELECT COUNT(*) FROM products;

Missing semicolon.

SQL

if (bar = 45) {{}}

if (bar === 45) {{}}

Use === for equality.

JavaScript

int x; System.out.println(x);

int x = 0; System.out.println(x);

Initialize variable.

Java

print('world')

Correct.

R

int* obj = nullptr; *obj=5;

int* obj = new int; *obj=5;

Allocate memory.

C++

Colon missing.

Python

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

Correct.

PowerShell

Add rel for security.

HTML

User.save();

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

Handle promise.

Node.js

if (bar = 47)

if (bar == 47)

Use ==.

Scala

SELECT * FROM orders WHRE age=10;

SELECT * FROM orders WHERE age=10;

Fix WHERE.

SQL

for temp in range(89) print(temp)

for temp in range(89): print(temp)

Colon after for.

Python

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

a == '59'

a === 59

Use strict equality.

JavaScript

if (index = 65) {{}}

if (index == 65) {{}}

Use ==.

Kotlin

'27' + 49

27 + 49

Avoid string coercion.

JavaScript

yield y

Correct yield.

Python

data[73]

if (data.indices.contains(73)) data[73]

Check index.

Kotlin

def render(): print('result')

Indent function body.

Python

INSERT INTO users VALUES ('world',98)

INSERT INTO users (id, email) VALUES ('world',98);

Specify columns.

SQL

if (b = 78)

if (b == 78)

Use ==.

R

disp('world')

Correct.

MATLAB

for i=1,55 do print(i) end

Correct.

Lua

if [ $index = 80 ]; then

if [ "$index" = 80 ]; then

Quote variable.

Shell

'world' + 56

'world' + 56.to_s

Convert int.

Ruby

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

raise 'message'

raise Exception('message')

Raise needs an exception class.

Python

Correct.

XML

let z: Int = 'world'

let z: String = 'world'

Fix type.

Swift

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

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

Return object on same line.

JavaScript

Remove trailing comma.

JSON

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

Correct.

MATLAB

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

print 'world'

print 'world';

Add semicolon.

Perl

const bar;

const bar = 77;

Initialize const.

JavaScript

9temp = 10

temp9 = 10

Variable cannot start with digit.

Python

System.out.println('data')

System.out.println('data');

Add semicolon.

Java

class Item {{ int item; }};

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

Make public.

C++

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

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

Throw Error objects.

JavaScript

let a: i32 = "hello";

let a: &str = "hello";

Type mismatch.

Rust

echo output hello

echo 'output hello'

Quote to prevent splitting.

Shell

while result > 84 result -= 1

while result > 84: result -= 1

Colon missing after while.

Python

<entry><age>data</age><name>58</name></entry

Add closing >.

XML

#content {{ color: green; }}

Correct.

CSS

let data = 'world'

let data = "world"

Double quotes.

Swift

<?php // code ?>

Correct.

PHP

int[] data = new int[10]; data[10] = 5;

int[] data = new int[10]; if (10 < data.length) data[10] = 5;

Check bounds.

Java

for (int i=0; i<54; i++) {{}}

Correct.

Java

name: value age: 53

Correct.

YAML

class = 'value'

class_name = 'value'

'class' is a keyword.

Python

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

Correct.

Dart

{ "name": "world" }

Correct.

JSON

cin >> bar cout << bar;

cin >> bar; cout << bar;

Add semicolon.

C++

with open('log.txt') as fp: data = fp.read()

Correct.

Python

b = 34

b=34

No spaces.

Shell

var bar int = 'test'

var bar string = 'test'

Type mismatch.

Go

Use CSS.

HTML

const num = 44; num = 1;

let num = 44; num = 1;

Cannot reassign const.

JavaScript

Add comma.

JSON

println('result')

println("result")

Double quotes.

Scala

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

Correct.

Shell

<table><tr><td>hello<td>world</tr></table>

<table><tr><td>hello</td><td>world</td></tr></table>

Close td.

HTML

def process(x): return x + 1

Correct.

Python

val c = 13; c = 2

var c = 13; c = 2

Use var for reassignment.

Scala

x := 41

Correct.

Go

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

Correct.

Shell

result = data

result = 'data'

Quote strings.

Python

echo 'info'

echo 'info';

Add semicolon.

PHP

print 'value'

print('value')

print needs parentheses.

Python

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

const p:Person = {{name:'hello', age:29}};

Add missing property.

TypeScript

if count = 36 then print('output') end

if count == 36 then print('output') end

Use ==.

Lua

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

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

Make field public.

Java