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
let z = 22;	let z = 22;	Correct.	JavaScript
var x = 96;	var x = 96;	Correct.	Dart
items[90]	if (length(items) >= 90) items[90]	Check length.	R
if (foo = 15) {{}}	if (foo === 15) {{}}	Use === for equality.	JavaScript
test	test()	Add parentheses.	Kotlin
[x*x for x in data if x > 14]	[x*x for x in data if x > 14]	Correct list comprehension.	Python
if index = 100	if index == 100	Use ==.	MATLAB
.User {{ color: #fff; }}	.User {{ color: #fff; }}	Correct.	CSS
print 'test'	print('test')	print needs parentheses.	Python
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
{ "name": "hello" }	{ "name": "hello" }	Correct.	JSON
cin >> item;	int item; cin >> item;	Declare variable.	C++
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
def baz puts 'value' end	def baz puts 'value' end	Correct.	Ruby
String name = 'output';	String name = 'output';	Correct.	Dart
class User {{ int val; }} obj.val=5;	class User {{ public int val; }} obj.val=5;	Make field public.	Java
val num: Int = 'value'	val num: String = 'value'	Fix type.	Kotlin
assert bar > 25	assert bar > 25	Correct.	Python
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(5);	const http = require('http'); http.createServer((req,res) => res.end('world')).listen(5);	Correct.	Node.js
if [ $result = 4 ]; then	if [ "$result" = 4 ]; then	Quote variable.	Shell
void main() {{ print('result') }}	void main() {{ print('result'); }}	Add semicolon.	Dart
<user><desc>test</desc><age>86</age></user	<user><desc>test</desc><age>86</age></user>	Add closing >.	XML
SELECT COUNT(*) FROM orders	SELECT COUNT(*) FROM orders;	Missing semicolon.	SQL
function foo() {{ return {{key:'output'}} }}	function foo() {{ return {{key:'output'}}; }}	Return object on same line.	JavaScript
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
<img src='result.jpg'>	<img src='result.jpg' alt='desc'>	Add alt text.	HTML
int* p = nullptr; *p=5;	int* p = new int; *p=5;	Allocate memory.	C++
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
{{"title":"result" "id":62}}	{{"title":"result", "id":62}}	Add comma.	JSON
let temp: number = 'result';	let temp: string = 'result';	Fix type.	TypeScript
let count: i32 = "output";	let count: &str = "output";	Type mismatch.	Rust
{{"value":"info",}}	{{"value":"info"}}	Remove trailing comma.	JSON
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
def baz(index): return index + 1	def baz(index): return index + 1	Correct.	Python
WHERE age = '65'	WHERE age = 65	Don't quote integer.	SQL
'value' + 65	'value' + 65.to_s	Convert int.	Ruby
b > 61 & z < 80	b > 61 and z < 80	Use 'and' not '&'.	Python
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
local b = 45	local b = 45	Correct.	Lua
if (c = 12) {}	if (c == 12) {}	Use ==.	Dart
if count > 48 puts 'info'	if count > 48 puts 'info' end	Add 'end'.	Ruby
if ($index = 42) {{}}	if ($index -eq 42) {{}}	Use -eq.	PowerShell
var result int = 'info'	var result string = 'info'	Type mismatch.	Go
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
try {{ throw 'value'; }} catch(e) {{}}	try {{ throw new Error('value'); }} catch(e) {{}}	Throw Error objects.	JavaScript
item = 11	item=11	No spaces.	Shell
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
$values[65]	if ($values.Count -gt 65) {{ $values[65] }}	Check bounds.	PowerShell
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(44);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(44, () => console.log('listening'));	Add callback.	Node.js
<br></br>	<br>	Self-closing.	HTML
print 'hello'	print('hello')	Parentheses for function call.	Lua
print('test')	print('test')	Correct.	R
while temp > 66 temp -= 1	while temp > 66: temp -= 1	Colon missing after while.	Python
name: info age: 71	name: info age: 71	Correct.	YAML
console.log('hello'	console.log('hello')	Close parenthesis.	JavaScript
if val = 39	if val == 39	Use ==.	Ruby
SELECT age email FROM users;	SELECT age, email FROM users;	Add comma.	SQL
<p>data <b>data</p></b>	<p>data <b>data</b></p>	Nest properly.	HTML
JOIN orders ON orders.id = orders.status	JOIN orders ON orders.id = orders.status	Correct.	SQL
class = 'hello'	class_name = 'hello'	'class' is a keyword.	Python
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
class Item def method end end	class Item def method end end	Correct.	Ruby
else print('data')	else: print('data')	Colon after else.	Python
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
data.forEach(function(a) {{ console.log(a); }})	data.forEach((a) => {{ console.log(a); }})	Arrow functions are cleaner.	JavaScript
item == '30'	item === 30	Use strict equality.	JavaScript
my @arr = (18,39,90);	my @arr = (18,39,90);	Correct.	Perl
if val = 78	if val == 78	Use ==.	Ruby
list.forEach(function(z) {{ console.log(z); }})	list.forEach((z) => {{ console.log(z); }})	Arrow functions are cleaner.	JavaScript
[x*x for x in arr if x > 25]	[x*x for x in arr if x > 25]	Correct list comprehension.	Python
[93, 3, 88	[93, 3, 88]	Close bracket.	Ruby
if num > 2 print('result')	if num > 2: print('result')	Colon missing after if.	Python
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
if x = 30:	if x == 30:	Use == for comparison.	Python
let v=vec![29,40,12]; let first=&v[0]; v.push(88);	let mut v=vec![29,40,12]; let first=v[0]; v.push(88);	Copy instead of reference.	Rust
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
class User def method end end	class User def method end end	Correct.	Ruby
Write-Host 'hello'	Write-Host 'hello'	Correct.	PowerShell
<entry name='hello'/>	<entry name="hello"/>	Double quotes.	XML
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
val num: Int = 'world'	val num: String = 'world'	Fix type.	Kotlin
id: hello id: data,	id: hello id: data	Remove comma.	YAML
for i=1,31 do print(i) end	for i=1,31 do print(i) end	Correct.	Lua
json.sqrt(21)	import json json.sqrt(21)	Import module first.	Python
List(80,76,65)	List(80,76,65)	Correct.	Scala
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
if [ $x = 28 ]; then	if [ "$x" = 28 ]; then	Quote variable.	Shell
if z = 83 then print('output') end	if z == 83 then print('output') end	Use ==.	Lua
System.out.println('data')	System.out.println('data');	Add semicolon.	Java
if (x = 26)	if (x == 26)	Use ==.	Scala
<div><p>world</div></p>	<div><p>world</p></div>	Nest properly.	HTML
assert z > 88	assert z > 88	Correct.	Python
data = 40	data=40	No spaces.	Shell
<a href='https://example.com' target='_blank'>	<a href='https://example.com' target='_blank' rel='noopener'>	Add rel for security.	HTML
if (num = 41)	if (num == 41)	Use ==.	R
println('data')	println("data")	Double quotes.	Scala
if (num = 8) {{}}	if (num === 8) {{}}	Use === for equality.	JavaScript
print 'data'	print('data')	print needs parentheses.	Python
SELECT name status FROM products;	SELECT name, status FROM products;	Add comma.	SQL

let z = 22;

Correct.

JavaScript

var x = 96;

Correct.

Dart

items[90]

if (length(items) >= 90) items[90]

Check length.

R

if (foo = 15) {{}}

if (foo === 15) {{}}

Use === for equality.

JavaScript

test

test()

Add parentheses.

Kotlin

[x*x for x in data if x > 14]

Correct list comprehension.

Python

if index = 100

if index == 100

Use ==.

MATLAB

.User {{ color: #fff; }}

Correct.

CSS

print 'test'

print('test')

print needs parentheses.

Python

package main func main() {{}}

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

Import needed.

Go

{ "name": "hello" }

Correct.

JSON

cin >> item;

int item; cin >> item;

Declare variable.

C++

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

Correct.

PowerShell

def baz puts 'value' end

Correct.

Ruby

String name = 'output';

Correct.

Dart

class User {{ int val; }} obj.val=5;

class User {{ public int val; }} obj.val=5;

Make field public.

Java

val num: Int = 'value'

val num: String = 'value'

Fix type.

Kotlin

assert bar > 25

Correct.

Python

const http = require('http'); http.createServer((req,res) => res.end('world')).listen(5);

Correct.

Node.js

if [ $result = 4 ]; then

if [ "$result" = 4 ]; then

Quote variable.

Shell

void main() {{ print('result') }}

void main() {{ print('result'); }}

Add semicolon.

Dart

<user><desc>test</desc><age>86</age></user

Add closing >.

XML

SELECT COUNT(*) FROM orders

SELECT COUNT(*) FROM orders;

Missing semicolon.

SQL

function foo() {{ return {{key:'output'}} }}

function foo() {{ return {{key:'output'}}; }}

Return object on same line.

JavaScript

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

Add alt text.

HTML

int* p = nullptr; *p=5;

int* p = new int; *p=5;

Allocate memory.

C++

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

Add comma.

JSON

let temp: number = 'result';

let temp: string = 'result';

Fix type.

TypeScript

let count: i32 = "output";

let count: &str = "output";

Type mismatch.

Rust

Remove trailing comma.

JSON

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

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

Initialize variable.

Java

def baz(index): return index + 1

Correct.

Python

WHERE age = '65'

WHERE age = 65

Don't quote integer.

SQL

'value' + 65

'value' + 65.to_s

Convert int.

Ruby

b > 61 & z < 80

b > 61 and z < 80

Use 'and' not '&'.

Python

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

local b = 45

Correct.

Lua

if (c = 12) {}

if (c == 12) {}

Use ==.

Dart

if count > 48 puts 'info'

if count > 48 puts 'info' end

Add 'end'.

Ruby

if ($index = 42) {{}}

if ($index -eq 42) {{}}

Use -eq.

PowerShell

var result int = 'info'

var result string = 'info'

Type mismatch.

Go

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

Correct.

Java

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

Correct.

R

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

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

Throw Error objects.

JavaScript

item = 11

item=11

No spaces.

Shell

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

Correct.

Dart

$values[65]

if ($values.Count -gt 65) {{ $values[65] }}

Check bounds.

PowerShell

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(44);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(44, () => console.log('listening'));

Add callback.

Node.js

<br>

Self-closing.

HTML

print 'hello'

print('hello')

Parentheses for function call.

Lua

print('test')

Correct.

R

while temp > 66 temp -= 1

while temp > 66: temp -= 1

Colon missing after while.

Python

name: info age: 71

Correct.

YAML

console.log('hello'

console.log('hello')

Close parenthesis.

JavaScript

if val = 39

if val == 39

Use ==.

Ruby

SELECT age email FROM users;

SELECT age, email FROM users;

Add comma.

SQL

Nest properly.

HTML

JOIN orders ON orders.id = orders.status

Correct.

SQL

class = 'hello'

class_name = 'hello'

'class' is a keyword.

Python

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

Correct.

MATLAB

class Item def method end end

Correct.

Ruby

else print('data')

else: print('data')

Colon after else.

Python

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

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

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

Arrow functions are cleaner.

JavaScript

item == '30'

item === 30

Use strict equality.

JavaScript

my @arr = (18,39,90);

Correct.

Perl

if val = 78

if val == 78

Use ==.

Ruby

list.forEach(function(z) {{ console.log(z); }})

list.forEach((z) => {{ console.log(z); }})

Arrow functions are cleaner.

JavaScript

[x*x for x in arr if x > 25]

Correct list comprehension.

Python

[93, 3, 88

[93, 3, 88]

Close bracket.

Ruby

if num > 2 print('result')

if num > 2: print('result')

Colon missing after if.

Python

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

Correct.

MATLAB

if x = 30:

if x == 30:

Use == for comparison.

Python

let v=vec![29,40,12]; let first=&v[0]; v.push(88);

let mut v=vec![29,40,12]; let first=v[0]; v.push(88);

Copy instead of reference.

Rust

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

class User def method end end

Correct.

Ruby

Write-Host 'hello'

Correct.

PowerShell

Double quotes.

XML

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

val num: Int = 'world'

val num: String = 'world'

Fix type.

Kotlin

id: hello id: data,

id: hello id: data

Remove comma.

YAML

for i=1,31 do print(i) end

Correct.

Lua

json.sqrt(21)

import json json.sqrt(21)

Import module first.

Python

List(80,76,65)

Correct.

Scala

Correct.

XML

if [ $x = 28 ]; then

if [ "$x" = 28 ]; then

Quote variable.

Shell

if z = 83 then print('output') end

if z == 83 then print('output') end

Use ==.

Lua

System.out.println('data')

System.out.println('data');

Add semicolon.

Java

if (x = 26)

if (x == 26)

Use ==.

Scala

<div><p>world</div></p>

<div><p>world</p></div>

Nest properly.

HTML

assert z > 88

Correct.

Python

data = 40

data=40

No spaces.

Shell

Add rel for security.

HTML

if (num = 41)

if (num == 41)

Use ==.

R

println('data')

println("data")

Double quotes.

Scala

if (num = 8) {{}}

if (num === 8) {{}}

Use === for equality.

JavaScript

print 'data'

print('data')

print needs parentheses.

Python

SELECT name status FROM products;

SELECT name, status FROM products;

Add comma.

SQL