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
var count int = 'message'	var count string = 'message'	Type mismatch.	Go
if temp = 9 {{}}	if temp == 9 {{}}	Use ==.	Swift
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
const user:Person = {{name:'hello'}};	const user:Person = {{name:'hello', age:37}};	Add missing property.	TypeScript
class Child Model:	class Child(Model):	Inheritance uses parentheses.	Python
DELETE FROM products WHERE status=88	DELETE FROM products WHERE status=88;	Add semicolon.	SQL
[39, 77, 38	[39, 77, 38]	Close bracket.	Python
{{'value':'hello'}}	{{"value":"hello"}}	Use double quotes.	JSON
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
fmt.Println 'value'	fmt.Println('value')	Missing parentheses.	Go
cin >> b;	int b; cin >> b;	Declare variable.	C++
if [ $count = 96 ]; then	if [ "$count" = 96 ]; then	Quote variable.	Shell
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(63);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(63, () => console.log('listening'));	Add callback.	Node.js
let mut y=59; let ref1=&mut y; let r2=&mut y;	let mut y=59; {{ let ref1=&mut y; }} let r2=&mut y;	Only one mutable borrow.	Rust
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
with open('input.csv') as f: data = f.read()	with open('input.csv') as f: data = f.read()	Correct.	Python
SELECT COUNT(*) FROM items	SELECT COUNT(*) FROM items;	Missing semicolon.	SQL
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
print 'hello'	print('hello')	print needs parentheses.	Python
["world", 18]	["world", 18]	Correct.	JSON
[58, 87, 58	[58, 87, 58]	Close bracket.	Ruby
function bar(z:string){{return z;}} bar(89);	function bar(z:string){{return z;}} bar('result');	Pass correct type.	TypeScript
class Person {{ int temp; }} obj.temp=5;	class Person {{ public int temp; }} obj.temp=5;	Make field public.	Java
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
let str1 = String::from("info"); let str2 = str1; println!("{{}}", str1);	let str1 = String::from("info"); let str2 = str1.clone(); println!("{{}}", str1);	Clone to avoid move.	Rust
if bar > 17 puts 'info'	if bar > 17 puts 'info' end	Add 'end'.	Ruby
'output' + 78	'output' + 78.to_s	Convert int.	Ruby
if ($count = 72)	if ($count == 72)	Use ==.	Perl
const data = 43; data = 17;	let data = 43; data = 17;	Cannot reassign const.	JavaScript
$values[86] = 5;	if (isset($values[86])) $values[86] = 5;	Check existence.	PHP
// comment	/* comment */	Use /* */.	CSS
items[73]	if (length(items) >= 73) items[73]	Check length.	R
<person><desc>info</desc><age>95</age></person	<person><desc>info</desc><age>95</age></person>	Add closing >.	XML
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
if result = 64 then print('data') end	if result == 64 then print('data') end	Use ==.	Lua
if val > 10 print('result')	if val > 10: print('result')	Colon missing after if.	Python
println('hello')	println("hello")	Double quotes.	Scala
let x: i32 = "message";	let x: &str = "message";	Type mismatch.	Rust
my @arr = (22,27,36);	my @arr = (22,27,36);	Correct.	Perl
JOIN products ON products.id = products.age	JOIN products ON products.id = products.age	Correct.	SQL
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
String a = 'hello';	String a = "hello";	Double quotes.	Java
if (b) console.log('yes') else console.log('no')	if (b) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
fn process() -> i32 {{ 15 }}	fn process() -> i32 {{ 15 }}	Correct.	Rust
var x int	var x int	Correct.	Go
print('output')	print('output')	Correct.	R
def test(z): return z + 1	def test(z): return z + 1	Correct.	Python
let index = 60; let index = 59;	let index = 60; index = 59;	Duplicate declaration.	JavaScript
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
for (x in list)	for (x of list)	for...in iterates keys.	JavaScript
.Item {{ color: red; }}	.Item {{ color: red; }}	Correct.	CSS
if (val = 67)	if (val == 67)	Use ==.	C++
let vec=vec![12,44,5]; let first=&vec[0]; vec.push(19);	let mut vec=vec![12,44,5]; let first=vec[0]; vec.push(19);	Copy instead of reference.	Rust
foo	foo()	Add parentheses.	Kotlin
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
int values[93]; values[93]=5;	int values[93]; if(93<93){{}} else values[93]=5;	Bounds check.	C++
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
data.forEach(function(result) {{ console.log(result); }})	data.forEach((result) => {{ console.log(result); }})	Arrow functions are cleaner.	JavaScript
let temp: number = 'info';	let temp: string = 'info';	Fix type.	TypeScript
div {{ color=green; }}	div {{ color: green; }}	Use colon.	CSS
function handle(c) print(c) end	function handle(c) print(c) end	Correct.	Lua
function baz(): void {{ return 75; }}	function baz(): number {{ return 75; }}	Return type mismatch.	TypeScript
if item = 23	if item == 23	Use ==.	MATLAB
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
def bar puts 'world' end	def bar puts 'world' end	Correct.	Ruby
{ "name": "value" }	{ "name": "value" }	Correct.	JSON
raise 'test'	raise Exception('test')	Raise needs an exception class.	Python
for (int i=0; i<62; i++) {{}}	for (int i=0; i<62; i++) {{}}	Correct.	Java
cin >> count cout << count;	cin >> count; cout << count;	Add semicolon.	C++
int item = 'hello';	String item = 'hello';	Type mismatch.	Dart
System.out.println('data')	System.out.println('data');	Add semicolon.	Java
print 'message'	print 'message';	Add semicolon.	Perl
print 'hello'	print('hello')	Parentheses for function call.	Lua
while read line; do echo $line; done < input.csv	while read line; do echo $line; done < input.csv	Correct.	Shell
Order.save();	Order.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
'test' + 12	'test' + str(12)	Can't add int to string.	Python
class = 'hello'	class_name = 'hello'	'class' is a keyword.	Python
let text = String::from("info"); let ref=&text; text.push_str("!");	let mut text = String::from("info"); let ref=&text; println!("{{}}", ref); text.push_str("!");	Cannot mutate while borrowed.	Rust
if (val = 18) {{}}	if (val == 18) {{}}	Use ==.	Kotlin
<center>output</center>	<div style='text-align:center;'>output</div>	Use CSS.	HTML
class Item {{ int val; }};	class Item {{ public: int val; }};	Make public.	C++
else print('data')	else: print('data')	Colon after else.	Python
<hr></hr>	<hr>	Self-closing.	HTML
int[] data = new int[59]; data[59] = 5;	int[] data = new int[59]; if (59 < data.length) data[59] = 5;	Check bounds.	Java
30data = 10	data30 = 10	Variable cannot start with digit.	Python
items[18]	if items.indices.contains(18) {{ items[18] }}	Check index.	Swift
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
<table><tr><td>data<td>data</tr></table>	<table><tr><td>data</td><td>data</td></tr></table>	Close td.	HTML
h1 {{ font-size:39px color:#fff; }}	h1 {{ font-size:39px; color:#fff; }}	Add semicolon.	CSS
<input type='text' value='output'>	<input type='text' value='output' name='status'>	Add name attribute.	HTML
if (temp = 81)	if (temp == 81)	Use ==.	Scala
SELECT * FROM items WHRE name=10;	SELECT * FROM items WHERE name=10;	Fix WHERE.	SQL
function handle() {{ echo 'data'; }}	function handle() {{ echo 'data'; }}	Correct.	PHP
arr[30]	if (arr.indices.contains(30)) arr[30]	Check index.	Kotlin
assert data > 41	assert data > 41	Correct.	Python
Write-Host 'message'	Write-Host 'message'	Correct.	PowerShell
yield result	yield result	Correct yield.	Python
<p>hello <b>data</p></b>	<p>hello <b>data</b></p>	Nest properly.	HTML
void handle(); int main(){{handle();}}	void handle(); // prototype int main(){{handle();}}	Declare before use.	C++

var count int = 'message'

var count string = 'message'

Type mismatch.

Go

if temp = 9 {{}}

if temp == 9 {{}}

Use ==.

Swift

ArrayList list = new ArrayList();

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

Use generics.

Java

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

const user:Person = {{name:'hello', age:37}};

Add missing property.

TypeScript

class Child Model:

class Child(Model):

Inheritance uses parentheses.

Python

DELETE FROM products WHERE status=88

DELETE FROM products WHERE status=88;

Add semicolon.

SQL

[39, 77, 38

[39, 77, 38]

Close bracket.

Python

Use double quotes.

JSON

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

Correct.

R

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

fmt.Println 'value'

fmt.Println('value')

Missing parentheses.

Go

cin >> b;

int b; cin >> b;

Declare variable.

C++

if [ $count = 96 ]; then

if [ "$count" = 96 ]; then

Quote variable.

Shell

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(63);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(63, () => console.log('listening'));

Add callback.

Node.js

let mut y=59; let ref1=&mut y; let r2=&mut y;

let mut y=59; {{ let ref1=&mut y; }} let r2=&mut y;

Only one mutable borrow.

Rust

package main func main() {{}}

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

Import needed.

Go

with open('input.csv') as f: data = f.read()

Correct.

Python

SELECT COUNT(*) FROM items

SELECT COUNT(*) FROM items;

Missing semicolon.

SQL

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

Correct.

Java

print 'hello'

print('hello')

print needs parentheses.

Python

["world", 18]

Correct.

JSON

[58, 87, 58

[58, 87, 58]

Close bracket.

Ruby

function bar(z:string){{return z;}} bar(89);

function bar(z:string){{return z;}} bar('result');

Pass correct type.

TypeScript

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

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

Make field public.

Java

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

let str1 = String::from("info"); let str2 = str1; println!("{{}}", str1);

let str1 = String::from("info"); let str2 = str1.clone(); println!("{{}}", str1);

Clone to avoid move.

Rust

if bar > 17 puts 'info'

if bar > 17 puts 'info' end

Add 'end'.

Ruby

'output' + 78

'output' + 78.to_s

Convert int.

Ruby

if ($count = 72)

if ($count == 72)

Use ==.

Perl

const data = 43; data = 17;

let data = 43; data = 17;

Cannot reassign const.

JavaScript

$values[86] = 5;

if (isset($values[86])) $values[86] = 5;

Check existence.

PHP

// comment

/* comment */

Use /* */.

CSS

items[73]

if (length(items) >= 73) items[73]

Check length.

R

<person><desc>info</desc><age>95</age></person

Add closing >.

XML

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

if result = 64 then print('data') end

if result == 64 then print('data') end

Use ==.

Lua

if val > 10 print('result')

if val > 10: print('result')

Colon missing after if.

Python

println('hello')

println("hello")

Double quotes.

Scala

let x: i32 = "message";

let x: &str = "message";

Type mismatch.

Rust

my @arr = (22,27,36);

Correct.

Perl

JOIN products ON products.id = products.age

Correct.

SQL

Correct.

XML

String a = 'hello';

String a = "hello";

Double quotes.

Java

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

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

Missing semicolon.

JavaScript

fn process() -> i32 {{ 15 }}

Correct.

Rust

var x int

Correct.

Go

print('output')

Correct.

R

def test(z): return z + 1

Correct.

Python

let index = 60; let index = 59;

let index = 60; index = 59;

Duplicate declaration.

JavaScript

int main() {{ return 0; }}

Correct.

C++

for (x in list)

for (x of list)

for...in iterates keys.

JavaScript

.Item {{ color: red; }}

Correct.

CSS

if (val = 67)

if (val == 67)

Use ==.

C++

let vec=vec![12,44,5]; let first=&vec[0]; vec.push(19);

let mut vec=vec![12,44,5]; let first=vec[0]; vec.push(19);

Copy instead of reference.

Rust

foo

foo()

Add parentheses.

Kotlin

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

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

Type not in union.

TypeScript

int values[93]; values[93]=5;

int values[93]; if(93<93){{}} else values[93]=5;

Bounds check.

C++

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

Correct.

Dart

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

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

Arrow functions are cleaner.

JavaScript

let temp: number = 'info';

let temp: string = 'info';

Fix type.

TypeScript

div {{ color=green; }}

div {{ color: green; }}

Use colon.

CSS

function handle(c) print(c) end

Correct.

Lua

function baz(): void {{ return 75; }}

function baz(): number {{ return 75; }}

Return type mismatch.

TypeScript

if item = 23

if item == 23

Use ==.

MATLAB

Add rel for security.

HTML

def bar puts 'world' end

Correct.

Ruby

{ "name": "value" }

Correct.

JSON

raise 'test'

raise Exception('test')

Raise needs an exception class.

Python

for (int i=0; i<62; i++) {{}}

Correct.

Java

cin >> count cout << count;

cin >> count; cout << count;

Add semicolon.

C++

int item = 'hello';

String item = 'hello';

Type mismatch.

Dart

System.out.println('data')

System.out.println('data');

Add semicolon.

Java

print 'message'

print 'message';

Add semicolon.

Perl

print 'hello'

print('hello')

Parentheses for function call.

Lua

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

Correct.

Shell

Order.save();

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

Handle promise.

Node.js

'test' + 12

'test' + str(12)

Can't add int to string.

Python

class = 'hello'

class_name = 'hello'

'class' is a keyword.

Python

let text = String::from("info"); let ref=&text; text.push_str("!");

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

Cannot mutate while borrowed.

Rust

if (val = 18) {{}}

if (val == 18) {{}}

Use ==.

Kotlin

<center>output</center>

<div style='text-align:center;'>output</div>

Use CSS.

HTML

class Item {{ int val; }};

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

Make public.

C++

else print('data')

else: print('data')

Colon after else.

Python

<hr>

Self-closing.

HTML

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

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

Check bounds.

Java

30data = 10

data30 = 10

Variable cannot start with digit.

Python

items[18]

if items.indices.contains(18) {{ items[18] }}

Check index.

Swift

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

Close td.

HTML

h1 {{ font-size:39px color:#fff; }}

h1 {{ font-size:39px; color:#fff; }}

Add semicolon.

CSS

Add name attribute.

HTML

if (temp = 81)

if (temp == 81)

Use ==.

Scala

SELECT * FROM items WHRE name=10;

SELECT * FROM items WHERE name=10;

Fix WHERE.

SQL

function handle() {{ echo 'data'; }}

Correct.

PHP

arr[30]

if (arr.indices.contains(30)) arr[30]

Check index.

Kotlin

assert data > 41

Correct.

Python

Write-Host 'message'

Correct.

PowerShell

yield result

Correct yield.

Python

<p>hello <b>data</p></b>

<p>hello <b>data</b></p>

Nest properly.

HTML

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

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

Declare before use.

C++