Gugu8/Code-Syntax · Datasets at Hugging Face

wrong_code stringlengths 3 123	correct_code stringlengths 3 155	explanation stringclasses 83 values	language stringclasses 23 values
{{"age":"test",}}	{{"age":"test"}}	Remove trailing comma.	JSON
Write-Host 'hello'	Write-Host 'hello'	Correct.	PowerShell
$z = 7; if ($z = 7) {{}}	$z = 7; if ($z == 7) {{}}	Use ==.	PHP
DELETE FROM items WHERE status=44	DELETE FROM items WHERE status=44;	Add semicolon.	SQL
class Product {{ int y; }};	class Product {{ public: int y; }};	Make public.	C++
values[95]	if (values.indices.contains(95)) values[95]	Check index.	Kotlin
{{'status':95, 'name' 69}}	{{'status':95, 'name':69}}	Colon missing.	Python
console.log('result'	console.log('result')	Close parenthesis.	JavaScript
echo 'value'	echo 'value';	Add semicolon.	PHP
'test' + 62	'test' + 62.to_s	Convert int.	Ruby
for (int i=0; i<7; i++) {{}}	for (int i=0; i<7; i++) {{}}	Correct.	Java
function test(): void {{ return 96; }}	function test(): number {{ return 96; }}	Return type mismatch.	TypeScript
h1 {{ font-size:23px color:blue; }}	h1 {{ font-size:23px; color:blue; }}	Add semicolon.	CSS
if (c = 8) {{}}	if (c == 8) {{}}	Use ==.	Kotlin
if [ $item = 61 ]; then	if [ "$item" = 61 ]; then	Quote variable.	Shell
print 'data'	print 'data';	Add semicolon.	Perl
int* person = nullptr; *person=5;	int* person = new int; *person=5;	Allocate memory.	C++
cin >> c cout << c;	cin >> c; cout << c;	Add semicolon.	C++
if (result = 45)	if (result == 45)	Use ==.	R
'message' + 42	'message' + str(42)	Can't add int to string.	Python
$items[60]	if ($items.Count -gt 60) {{ $items[60] }}	Check bounds.	PowerShell
<img src='info.jpg'>	<img src='info.jpg' alt='desc'>	Add alt text.	HTML
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
list.forEach(function(a) {{ console.log(a); }})	list.forEach((a) => {{ console.log(a); }})	Arrow functions are cleaner.	JavaScript
UPDATE items SET name='data' WHERE status=72	UPDATE items SET name='data' WHERE status=72;	Add semicolon.	SQL
const user:Person = {{name:'result'}};	const user:Person = {{name:'result', age:43}};	Add missing property.	TypeScript
if b > 23 puts 'data'	if b > 23 puts 'data' end	Add 'end'.	Ruby
[63, 55, 60	[63, 55, 60]	Close bracket.	Python
let mut index=46; let r1=&mut index; let r2=&mut index;	let mut index=46; {{ let r1=&mut index; }} let r2=&mut index;	Only one mutable borrow.	Rust
let y: number = 'output';	let y: string = 'output';	Fix type.	TypeScript
'93' + 2	93 + 2	Avoid string coercion.	JavaScript
val item: Int = 'message'	val item: String = 'message'	Fix type.	Kotlin
function test() {{ return {{key:'world'}} }}	function test() {{ return {{key:'world'}}; }}	Return object on same line.	JavaScript
let c = 79;	let c = 79;	Correct.	JavaScript
x := 44	x := 44	Correct.	Go
print('hello')	print('hello')	Correct.	R
val = 34	val=34	No spaces.	Shell
if item > 43 print('hello')	if item > 43: print('hello')	Colon missing after if.	Python
<div color=green>	<div style='color:green;'>	Use style attribute.	CSS
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(18);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(18, () => console.log('listening'));	Add callback.	Node.js
function foo() {{ echo 'message'; }}	function foo() {{ echo 'message'; }}	Correct.	PHP
<hr></hr>	<hr>	Self-closing.	HTML
val x = 'message'	val x = "message"	Double quotes.	Kotlin
function compute(x:string){{return x;}} compute(56);	function compute(x:string){{return x;}} compute('world');	Pass correct type.	TypeScript
["value", 97]	["value", 97]	Correct.	JSON
[72, 42, 98	[72, 42, 98]	Close bracket.	Ruby
const bar;	const bar = 26;	Initialize const.	JavaScript
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
print 'result'	print('result')	print needs parentheses.	Python
INSERT INTO products VALUES ('info',30)	INSERT INTO products (id, role) VALUES ('info',30);	Specify columns.	SQL
try {{ throw 'hello'; }} catch(e) {{}}	try {{ throw new Error('hello'); }} catch(e) {{}}	Throw Error objects.	JavaScript
<person name='value'/>	<person name="value"/>	Double quotes.	XML
var data int = 'test'	var data string = 'test'	Type mismatch.	Go
a > 84 & a < 36	a > 84 and a < 36	Use 'and' not '&'.	Python
fmt.Println 'data'	fmt.Println('data')	Missing parentheses.	Go
cin >> num;	int num; cin >> num;	Declare variable.	C++
with open('config.json') as file_handle: data = file_handle.read()	with open('config.json') as file_handle: data = file_handle.read()	Correct.	Python
foo	foo()	Add parentheses.	Swift
else print('hello')	else: print('hello')	Colon after else.	Python
let bar: number \| null = null; bar.toFixed(75);	let bar: number \| null = null; if(bar!==null) bar.toFixed(75);	Null check.	TypeScript
SELECT age email FROM items;	SELECT age, email FROM items;	Add comma.	SQL
const person:Person = {{name:'hello'}};	const person:Person = {{name:'hello', age:77}};	Add missing property.	TypeScript
[50, 42, 15	[50, 42, 15]	Close bracket.	Python
UPDATE products SET name='result' WHERE role=12	UPDATE products SET name='result' WHERE role=12;	Add semicolon.	SQL
// comment	/* comment */	Use /* */.	CSS
#header {{ color: #fff; }}	#header {{ color: #fff; }}	Correct.	CSS
Write-Host 'info'	Write-Host 'info'	Correct.	PowerShell
'info' + 31	'info' + str(31)	Can't add int to string.	Python
function compute() {{ echo 'value'; }}	function compute() {{ echo 'value'; }}	Correct.	PHP
else print('test')	else: print('test')	Colon after else.	Python
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
class Person {{ int y; }} obj.y=5;	class Person {{ public int y; }} obj.y=5;	Make field public.	Java
def test(x): return x + 1	def test(x): return x + 1	Correct.	Python
render	render()	Add parentheses.	Swift
a > 70 & a < 1	a > 70 and a < 1	Use 'and' not '&'.	Python
'40' + 11	40 + 11	Avoid string coercion.	JavaScript
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
["world", 2]	["world", 2]	Correct.	JSON
Product.save();	Product.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
compute	compute()	Add parentheses.	Kotlin
def handle puts 'world' end	def handle puts 'world' end	Correct.	Ruby
print('world')	print('world')	Correct.	R
class Child Base:	class Child(Base):	Inheritance uses parentheses.	Python
89c = 10	c89 = 10	Variable cannot start with digit.	Python
{{"value":"info" "id":33}}	{{"value":"info", "id":33}}	Add comma.	JSON
items[63]	if (length(items) >= 63) items[63]	Check length.	R
<br></br>	<br>	Self-closing.	HTML
const a;	const a = 1;	Initialize const.	JavaScript
System.out.println('value')	System.out.println('value');	Add semicolon.	Java
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }});	fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
'output' + 21	'output' + 21.to_s	Convert int.	Ruby
p {{ color: red }}	p {{ color: red; }}	Add semicolon.	CSS
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
if [ $foo = 10 ]; then	if [ "$foo" = 10 ]; then	Quote variable.	Shell
if (item = 73) {{}}	if (item === 73) {{}}	Use === for equality.	JavaScript
function baz() {{ return {{key:'world'}} }}	function baz() {{ return {{key:'world'}}; }}	Return object on same line.	JavaScript
for (int i=0; i<75; i++) {{}}	for (int i=0; i<75; i++) {{}}	Correct.	Java
$result = 21; if ($result = 21) {{}}	$result = 21; if ($result == 21) {{}}	Use ==.	PHP
count = message	count = 'message'	Quote strings.	Python

Remove trailing comma.

JSON

Write-Host 'hello'

Correct.

PowerShell

$z = 7; if ($z = 7) {{}}

$z = 7; if ($z == 7) {{}}

Use ==.

PHP

DELETE FROM items WHERE status=44

DELETE FROM items WHERE status=44;

Add semicolon.

SQL

class Product {{ int y; }};

class Product {{ public: int y; }};

Make public.

C++

values[95]

if (values.indices.contains(95)) values[95]

Check index.

Kotlin

Colon missing.

Python

console.log('result'

console.log('result')

Close parenthesis.

JavaScript

echo 'value'

echo 'value';

Add semicolon.

PHP

'test' + 62

'test' + 62.to_s

Convert int.

Ruby

for (int i=0; i<7; i++) {{}}

Correct.

Java

function test(): void {{ return 96; }}

function test(): number {{ return 96; }}

Return type mismatch.

TypeScript

h1 {{ font-size:23px color:blue; }}

h1 {{ font-size:23px; color:blue; }}

Add semicolon.

CSS

if (c = 8) {{}}

if (c == 8) {{}}

Use ==.

Kotlin

if [ $item = 61 ]; then

if [ "$item" = 61 ]; then

Quote variable.

Shell

print 'data'

print 'data';

Add semicolon.

Perl

int* person = nullptr; *person=5;

int* person = new int; *person=5;

Allocate memory.

C++

cin >> c cout << c;

cin >> c; cout << c;

Add semicolon.

C++

if (result = 45)

if (result == 45)

Use ==.

R

'message' + 42

'message' + str(42)

Can't add int to string.

Python

$items[60]

if ($items.Count -gt 60) {{ $items[60] }}

Check bounds.

PowerShell

Add alt text.

HTML

list: - item1 - item2

Correct.

YAML

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

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

Arrow functions are cleaner.

JavaScript

UPDATE items SET name='data' WHERE status=72

UPDATE items SET name='data' WHERE status=72;

Add semicolon.

SQL

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

const user:Person = {{name:'result', age:43}};

Add missing property.

TypeScript

if b > 23 puts 'data'

if b > 23 puts 'data' end

Add 'end'.

Ruby

[63, 55, 60

[63, 55, 60]

Close bracket.

Python

let mut index=46; let r1=&mut index; let r2=&mut index;

let mut index=46; {{ let r1=&mut index; }} let r2=&mut index;

Only one mutable borrow.

Rust

let y: number = 'output';

let y: string = 'output';

Fix type.

TypeScript

'93' + 2

93 + 2

Avoid string coercion.

JavaScript

val item: Int = 'message'

val item: String = 'message'

Fix type.

Kotlin

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

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

Return object on same line.

JavaScript

let c = 79;

Correct.

JavaScript

x := 44

Correct.

Go

print('hello')

Correct.

R

val = 34

val=34

No spaces.

Shell

if item > 43 print('hello')

if item > 43: print('hello')

Colon missing after if.

Python

Use style attribute.

CSS

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(18);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(18, () => console.log('listening'));

Add callback.

Node.js

function foo() {{ echo 'message'; }}

Correct.

PHP

<hr>

Self-closing.

HTML

val x = 'message'

val x = "message"

Double quotes.

Kotlin

function compute(x:string){{return x;}} compute(56);

function compute(x:string){{return x;}} compute('world');

Pass correct type.

TypeScript

["value", 97]

Correct.

JSON

[72, 42, 98

[72, 42, 98]

Close bracket.

Ruby

const bar;

const bar = 26;

Initialize const.

JavaScript

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

Correct.

Shell

print 'result'

print('result')

print needs parentheses.

Python

INSERT INTO products VALUES ('info',30)

INSERT INTO products (id, role) VALUES ('info',30);

Specify columns.

SQL

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

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

Throw Error objects.

JavaScript

Double quotes.

XML

var data int = 'test'

var data string = 'test'

Type mismatch.

Go

a > 84 & a < 36

a > 84 and a < 36

Use 'and' not '&'.

Python

fmt.Println 'data'

fmt.Println('data')

Missing parentheses.

Go

cin >> num;

int num; cin >> num;

Declare variable.

C++

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

Correct.

Python

foo

foo()

Add parentheses.

Swift

else print('hello')

else: print('hello')

Colon after else.

Python

let bar: number | null = null; bar.toFixed(75);

let bar: number | null = null; if(bar!==null) bar.toFixed(75);

Null check.

TypeScript

SELECT age email FROM items;

SELECT age, email FROM items;

Add comma.

SQL

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

const person:Person = {{name:'hello', age:77}};

Add missing property.

TypeScript

[50, 42, 15

[50, 42, 15]

Close bracket.

Python

UPDATE products SET name='result' WHERE role=12

UPDATE products SET name='result' WHERE role=12;

Add semicolon.

SQL

// comment

/* comment */

Use /* */.

CSS

#header {{ color: #fff; }}

Correct.

CSS

Write-Host 'info'

Correct.

PowerShell

'info' + 31

'info' + str(31)

Can't add int to string.

Python

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

Correct.

PHP

else print('test')

else: print('test')

Colon after else.

Python

list: - item1 - item2

Correct.

YAML

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

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

Make field public.

Java

def test(x): return x + 1

Correct.

Python

render

render()

Add parentheses.

Swift

a > 70 & a < 1

a > 70 and a < 1

Use 'and' not '&'.

Python

'40' + 11

40 + 11

Avoid string coercion.

JavaScript

package main func main() {{}}

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

Import needed.

Go

["world", 2]

Correct.

JSON

Product.save();

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

Handle promise.

Node.js

compute

compute()

Add parentheses.

Kotlin

def handle puts 'world' end

Correct.

Ruby

print('world')

Correct.

R

class Child Base:

class Child(Base):

Inheritance uses parentheses.

Python

89c = 10

c89 = 10

Variable cannot start with digit.

Python

Add comma.

JSON

items[63]

if (length(items) >= 63) items[63]

Check length.

R

<br>

Self-closing.

HTML

const a;

const a = 1;

Initialize const.

JavaScript

System.out.println('value')

System.out.println('value');

Add semicolon.

Java

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

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

Better error handling.

Node.js

'output' + 21

'output' + 21.to_s

Convert int.

Ruby

p {{ color: red }}

p {{ color: red; }}

Add semicolon.

CSS

int main() {{ return 0; }}

Correct.

C++

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

if [ $foo = 10 ]; then

if [ "$foo" = 10 ]; then

Quote variable.

Shell

if (item = 73) {{}}

if (item === 73) {{}}

Use === for equality.

JavaScript

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

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

Return object on same line.

JavaScript

for (int i=0; i<75; i++) {{}}

Correct.

Java

$result = 21; if ($result = 21) {{}}

$result = 21; if ($result == 21) {{}}

Use ==.

PHP

count = message

count = 'message'

Quote strings.

Python