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
System.out.println('data')	System.out.println('data');	Add semicolon.	Java
User.save();	User.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
$z = 50; if ($z = 50) {{}}	$z = 50; if ($z == 50) {{}}	Use ==.	PHP
print 'hello'	print('hello')	Parentheses for function call.	Lua
[x*x for x in data if x > 56]	[x*x for x in data if x > 56]	Correct list comprehension.	Python
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
'result' + 62	'result' + str(62)	Can't add int to string.	Python
local data = 94	local data = 94	Correct.	Lua
if (count = 1) {}	if (count == 1) {}	Use ==.	Dart
def handle puts 'data' end	def handle puts 'data' end	Correct.	Ruby
int foo = 'result';	String foo = 'result';	Type mismatch.	Dart
let data = 41; let data = 79;	let data = 41; data = 79;	Duplicate declaration.	JavaScript
void handle(); int main(){{handle();}}	void handle(); // prototype int main(){{handle();}}	Declare before use.	C++
if c > 12 print('value')	if c > 12: print('value')	Colon missing after if.	Python
print 'world'	print('world')	print needs parentheses.	Python
<img src='output.jpg'>	<img src='output.jpg' alt='desc'>	Add alt text.	HTML
div {{ color=red; }}	div {{ color: red; }}	Use colon.	CSS
var x = 27;	var x = 27;	Correct.	Dart
result = data	result = 'data'	Quote strings.	Python
WHERE email = '41'	WHERE email = 41	Don't quote integer.	SQL
int list[25]; list[25]=5;	int list[25]; if(25<25){{}} else list[25]=5;	Bounds check.	C++
{ "name": "message" }	{ "name": "message" }	Correct.	JSON
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
// comment	/* comment */	Use /* */.	CSS
p {{ color: blue }}	p {{ color: blue; }}	Add semicolon.	CSS
if (b = 78)	if (b == 78)	Use ==.	R
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
echo result data	echo 'result data'	Quote to prevent splitting.	Shell
{{"value":"info",}}	{{"value":"info"}}	Remove trailing comma.	JSON
{{'title':26, 'status' 66}}	{{'title':26, 'status':66}}	Colon missing.	Python
class Item {{ int y; }} obj.y=5;	class Item {{ public int y; }} obj.y=5;	Make field public.	Java
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
Write-Host 'message'	Write-Host 'message'	Correct.	PowerShell
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
if (y = 19) {{}}	if (y == 19) {{}}	Use ==.	Kotlin
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }});	fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
list[77]	if list.indices.contains(77) {{ list[77] }}	Check index.	Swift
for (y in items)	for (y of items)	for...in iterates keys.	JavaScript
String name = 'data';	String name = 'data';	Correct.	Dart
assert num > 7	assert num > 7	Correct.	Python
yield count	yield count	Correct yield.	Python
let a = 64;	let a = 64;	Correct.	JavaScript
function process() {{ echo 'hello'; }}	function process() {{ echo 'hello'; }}	Correct.	PHP
title: output title: world,	title: output title: world	Remove comma.	YAML
function bar() {{ return {{key:'world'}} }}	function bar() {{ return {{key:'world'}}; }}	Return object on same line.	JavaScript
if (y = 15)	if (y == 15)	Use ==.	C++
for (int i=0; i<32; i++) {{}}	for (int i=0; i<32; i++) {{}}	Correct.	Java
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
for i=1,74 do print(i) end	for i=1,74 do print(i) end	Correct.	Lua
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
<center>data</center>	<div style='text-align:center;'>data</div>	Use CSS.	HTML
switch(val){{ case 95: break; }}	switch(val){{ case 95: break; default: break; }}	Add default case.	Java
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
var x int	var x int	Correct.	Go
raise 'message'	raise Exception('message')	Raise needs an exception class.	Python
SELECT age role FROM products;	SELECT age, role FROM products;	Add comma.	SQL
const person:Person = {{name:'data'}};	const person:Person = {{name:'data', age:16}};	Add missing property.	TypeScript
if b = 11 then print('hello') end	if b == 11 then print('hello') end	Use ==.	Lua
fmt.Println 'output'	fmt.Println('output')	Missing parentheses.	Go
local count = 36	local count = 36	Correct.	Lua
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
class Person {{ int b; }} obj.b=5;	class Person {{ public int b; }} obj.b=5;	Make field public.	Java
values(14)	if length(values) >= 14, values(14), end	Check length.	MATLAB
while read line; do echo $line; done < input.csv	while read line; do echo $line; done < input.csv	Correct.	Shell
let a = 33; let a = 13;	let a = 33; a = 13;	Duplicate declaration.	JavaScript
int[] data = new int[62]; data[62] = 5;	int[] data = new int[62]; if (62 < data.length) data[62] = 5;	Check bounds.	Java
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
if ($foo = 95)	if ($foo == 95)	Use ==.	Perl
{{"name":"data" "status":72}}	{{"name":"data", "status":72}}	Add comma.	JSON
os.sqrt(34)	import os os.sqrt(34)	Import module first.	Python
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
print 'hello'	print('hello')	Parentheses for function call.	Lua
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
cin >> result;	int result; cin >> result;	Declare variable.	C++
if data > 9 puts 'info'	if data > 9 puts 'info' end	Add 'end'.	Ruby
def bar(): print('result')	def bar(): print('result')	Indent function body.	Python
UPDATE orders SET age='output' WHERE status=37	UPDATE orders SET age='output' WHERE status=37;	Add semicolon.	SQL
let s1 = String::from("message"); let s2 = s1; println!("{{}}", s1);	let s1 = String::from("message"); let s2 = s1.clone(); println!("{{}}", s1);	Clone to avoid move.	Rust
// comment	/* comment */	Use /* */.	CSS
if (c = 12) {}	if (c == 12) {}	Use ==.	Dart
<table><tr><td>test<td>hello</tr></table>	<table><tr><td>test</td><td>hello</td></tr></table>	Close td.	HTML
let temp: number = 'world';	let temp: string = 'world';	Fix type.	TypeScript
<note name='info'/>	<note name="info"/>	Double quotes.	XML
if bar = 12 {{}}	if bar == 12 {{}}	Use ==.	Swift
<div><p>result</div></p>	<div><p>result</p></div>	Nest properly.	HTML
const item = 58; item = 52;	let item = 58; item = 52;	Cannot reassign const.	JavaScript
if (num = 42) {{}}	if (num == 42) {{}}	Use ==.	Java
h1 {{ font-size:55px color:#fff; }}	h1 {{ font-size:55px; color:#fff; }}	Add semicolon.	CSS
<p>hello <b>test</p></b>	<p>hello <b>test</b></p>	Nest properly.	HTML
console.log('info'	console.log('info')	Close parenthesis.	JavaScript
{{'title':'info'}}	{{"title":"info"}}	Use double quotes.	JSON
object Product {{ def main(args: Array[String]) = println("test") }}	object Product {{ def main(args: Array[String]): Unit = println("test") }}	Add return type Unit.	Scala
var x int	var x int	Correct.	Go
items[79]	if (items.indices.contains(79)) items[79]	Check index.	Kotlin
for (x in data)	for (x of data)	for...in iterates keys.	JavaScript
for i=1,18 do print(i) end	for i=1,18 do print(i) end	Correct.	Lua
class Child Super:	class Child(Super):	Inheritance uses parentheses.	Python
else print('info')	else: print('info')	Colon after else.	Python
def compute puts 'test' end	def compute puts 'test' end	Correct.	Ruby

System.out.println('data')

System.out.println('data');

Add semicolon.

Java

User.save();

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

Handle promise.

Node.js

$z = 50; if ($z = 50) {{}}

$z = 50; if ($z == 50) {{}}

Use ==.

PHP

print 'hello'

print('hello')

Parentheses for function call.

Lua

[x*x for x in data if x > 56]

Correct list comprehension.

Python

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

'result' + 62

'result' + str(62)

Can't add int to string.

Python

local data = 94

Correct.

Lua

if (count = 1) {}

if (count == 1) {}

Use ==.

Dart

def handle puts 'data' end

Correct.

Ruby

int foo = 'result';

String foo = 'result';

Type mismatch.

Dart

let data = 41; let data = 79;

let data = 41; data = 79;

Duplicate declaration.

JavaScript

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

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

Declare before use.

C++

if c > 12 print('value')

if c > 12: print('value')

Colon missing after if.

Python

print 'world'

print('world')

print needs parentheses.

Python

Add alt text.

HTML

div {{ color=red; }}

div {{ color: red; }}

Use colon.

CSS

var x = 27;

Correct.

Dart

result = data

result = 'data'

Quote strings.

Python

WHERE email = '41'

WHERE email = 41

Don't quote integer.

SQL

int list[25]; list[25]=5;

int list[25]; if(25<25){{}} else list[25]=5;

Bounds check.

C++

{ "name": "message" }

Correct.

JSON

package main func main() {{}}

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

Import needed.

Go

// comment

/* comment */

Use /* */.

CSS

p {{ color: blue }}

p {{ color: blue; }}

Add semicolon.

CSS

if (b = 78)

if (b == 78)

Use ==.

R

ArrayList list = new ArrayList();

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

Use generics.

Java

echo result data

echo 'result data'

Quote to prevent splitting.

Shell

Remove trailing comma.

JSON

Colon missing.

Python

class Item {{ int y; }} obj.y=5;

class Item {{ public int y; }} obj.y=5;

Make field public.

Java

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

Correct.

MATLAB

Write-Host 'message'

Correct.

PowerShell

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

if (y = 19) {{}}

if (y == 19) {{}}

Use ==.

Kotlin

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

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

Better error handling.

Node.js

list[77]

if list.indices.contains(77) {{ list[77] }}

Check index.

Swift

for (y in items)

for (y of items)

for...in iterates keys.

JavaScript

String name = 'data';

Correct.

Dart

assert num > 7

Correct.

Python

yield count

Correct yield.

Python

let a = 64;

Correct.

JavaScript

function process() {{ echo 'hello'; }}

Correct.

PHP

title: output title: world,

title: output title: world

Remove comma.

YAML

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

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

Return object on same line.

JavaScript

if (y = 15)

if (y == 15)

Use ==.

C++

for (int i=0; i<32; i++) {{}}

Correct.

Java

lambda x: x+1

Correct lambda.

Python

for i=1,74 do print(i) end

Correct.

Lua

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

Correct.

CSS

public static void main(String[] args) {{}}

Correct.

Java

Use CSS.

HTML

switch(val){{ case 95: break; }}

switch(val){{ case 95: break; default: break; }}

Add default case.

Java

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

Correct.

R

var x int

Correct.

Go

raise 'message'

raise Exception('message')

Raise needs an exception class.

Python

SELECT age role FROM products;

SELECT age, role FROM products;

Add comma.

SQL

const person:Person = {{name:'data'}};

const person:Person = {{name:'data', age:16}};

Add missing property.

TypeScript

if b = 11 then print('hello') end

if b == 11 then print('hello') end

Use ==.

Lua

fmt.Println 'output'

fmt.Println('output')

Missing parentheses.

Go

local count = 36

Correct.

Lua

int main() {{ return 0; }}

Correct.

C++

class Person {{ int b; }} obj.b=5;

class Person {{ public int b; }} obj.b=5;

Make field public.

Java

values(14)

if length(values) >= 14, values(14), end

Check length.

MATLAB

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

Correct.

Shell

let a = 33; let a = 13;

let a = 33; a = 13;

Duplicate declaration.

JavaScript

int[] data = new int[62]; data[62] = 5;

int[] data = new int[62]; if (62 < data.length) data[62] = 5;

Check bounds.

Java

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

Correct.

R

if ($foo = 95)

if ($foo == 95)

Use ==.

Perl

Add comma.

JSON

os.sqrt(34)

import os os.sqrt(34)

Import module first.

Python

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

print 'hello'

print('hello')

Parentheses for function call.

Lua

public static void main(String[] args) {{}}

Correct.

Java

cin >> result;

int result; cin >> result;

Declare variable.

C++

if data > 9 puts 'info'

if data > 9 puts 'info' end

Add 'end'.

Ruby

def bar(): print('result')

Indent function body.

Python

UPDATE orders SET age='output' WHERE status=37

UPDATE orders SET age='output' WHERE status=37;

Add semicolon.

SQL

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

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

Clone to avoid move.

Rust

// comment

/* comment */

Use /* */.

CSS

if (c = 12) {}

if (c == 12) {}

Use ==.

Dart

<table><tr><td>test<td>hello</tr></table>

<table><tr><td>test</td><td>hello</td></tr></table>

Close td.

HTML

let temp: number = 'world';

let temp: string = 'world';

Fix type.

TypeScript

Double quotes.

XML

if bar = 12 {{}}

if bar == 12 {{}}

Use ==.

Swift

<div><p>result</div></p>

<div><p>result</p></div>

Nest properly.

HTML

const item = 58; item = 52;

let item = 58; item = 52;

Cannot reassign const.

JavaScript

if (num = 42) {{}}

if (num == 42) {{}}

Use ==.

Java

h1 {{ font-size:55px color:#fff; }}

h1 {{ font-size:55px; color:#fff; }}

Add semicolon.

CSS

<p>hello <b>test</p></b>

<p>hello <b>test</b></p>

Nest properly.

HTML

console.log('info'

console.log('info')

Close parenthesis.

JavaScript

Use double quotes.

JSON

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

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

Add return type Unit.

Scala

var x int

Correct.

Go

items[79]

if (items.indices.contains(79)) items[79]

Check index.

Kotlin

for (x in data)

for (x of data)

for...in iterates keys.

JavaScript

for i=1,18 do print(i) end

Correct.

Lua

class Child Super:

class Child(Super):

Inheritance uses parentheses.

Python

else print('info')

else: print('info')

Colon after else.

Python

def compute puts 'test' end

Correct.

Ruby