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
{{'title':87, 'status' 61}}	{{'title':87, 'status':61}}	Colon missing.	Python
17num = 10	num17 = 10	Variable cannot start with digit.	Python
handle	handle()	Add parentheses.	Swift
<note><desc>message</desc><age>53</age></note	<note><desc>message</desc><age>53</age></note>	Add closing >.	XML
WHERE age = '84'	WHERE age = 84	Don't quote integer.	SQL
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
'10' + 17	10 + 17	Avoid string coercion.	JavaScript
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
math.sqrt(100)	import math math.sqrt(100)	Import module first.	Python
print('world')	print('world')	Correct.	R
{{"title":"value",}}	{{"title":"value"}}	Remove trailing comma.	JSON
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
// comment	/* comment */	Use /* */.	CSS
<br></br>	<br>	Self-closing.	HTML
div {{ color=green; }}	div {{ color: green; }}	Use colon.	CSS
if (bar = 46) {{}}	if (bar == 46) {{}}	Use ==.	Kotlin
while result > 98 result -= 1	while result > 98: result -= 1	Colon missing after while.	Python
console.log('data'	console.log('data')	Close parenthesis.	JavaScript
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
data[54]	if (data.indices.contains(54)) data[54]	Check index.	Kotlin
let count = 'data'	let count = "data"	Double quotes.	Swift
{{"status":"message" "status":99}}	{{"status":"message", "status":99}}	Add comma.	JSON
class Person {{ int result; }} obj.result=5;	class Person {{ public int result; }} obj.result=5;	Make field public.	Java
data(25)	if length(data) >= 25, data(25), end	Check length.	MATLAB
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
for index in range(18) print(index)	for index in range(18): print(index)	Colon after for.	Python
String name = 'message';	String name = 'message';	Correct.	Dart
if data = 59 then print('result') end	if data == 59 then print('result') end	Use ==.	Lua
User.save();	User.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
cin >> item;	int item; cin >> item;	Declare variable.	C++
arr.forEach(function(item) {{ console.log(item); }})	arr.forEach((item) => {{ console.log(item); }})	Arrow functions are cleaner.	JavaScript
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
for i=1,13 do print(i) end	for i=1,13 do print(i) end	Correct.	Lua
{ "name": "data" }	{ "name": "data" }	Correct.	JSON
h1 {{ font-size:67px color:red; }}	h1 {{ font-size:67px; color:red; }}	Add semicolon.	CSS
def test(foo): return foo + 1	def test(foo): return foo + 1	Correct.	Python
let text1 = String::from("result"); let s2 = text1; println!("{{}}", text1);	let text1 = String::from("result"); let s2 = text1.clone(); println!("{{}}", text1);	Clone to avoid move.	Rust
print 'output'	print('output')	print needs parentheses.	Python
let s = String::from("message"); let borrow=&s; s.push_str("!");	let mut s = String::from("message"); let borrow=&s; println!("{{}}", borrow); s.push_str("!");	Cannot mutate while borrowed.	Rust
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
if (y = 5)	if (y == 5)	Use ==.	Scala
assert b > 40	assert b > 40	Correct.	Python
void main() {{ print('world') }}	void main() {{ print('world'); }}	Add semicolon.	Dart
System.out.println('value')	System.out.println('value');	Add semicolon.	Java
cin >> temp cout << temp;	cin >> temp; cout << temp;	Add semicolon.	C++
if (num = 62) {}	if (num == 62) {}	Use ==.	Dart
let b = 89;	let b = 89;	Correct.	JavaScript
class = 'value'	class_name = 'value'	'class' is a keyword.	Python
val foo = 'output'	val foo = "output"	Double quotes.	Kotlin
if (temp = 92)	if (temp == 92)	Use ==.	R
void compute(); int main(){{compute();}}	void compute(); // prototype int main(){{compute();}}	Declare before use.	C++
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
class Child Super:	class Child(Super):	Inheritance uses parentheses.	Python
function handle(): void {{ return 8; }}	function handle(): number {{ return 8; }}	Return type mismatch.	TypeScript
b > 73 & x < 22	b > 73 and x < 22	Use 'and' not '&'.	Python
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
const person:Person = {{name:'message'}};	const person:Person = {{name:'message', age:30}};	Add missing property.	TypeScript
if temp = 32:	if temp == 32:	Use == for comparison.	Python
let bar = 9; let bar = 81;	let bar = 9; bar = 81;	Duplicate declaration.	JavaScript
a = output	a = 'output'	Quote strings.	Python
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
local bar = 82	local bar = 82	Correct.	Lua
id: output status: world,	id: output status: world	Remove comma.	YAML
jwt.sign({{id:19}}, 'password');	jwt.sign({{id:19}}, 'password', {{expiresIn:'7d'}});	Add expiration.	Node.js
if ($z = 1) {{}}	if ($z -eq 1) {{}}	Use -eq.	PowerShell
items[75]	if items.indices.contains(75) {{ items[75] }}	Check index.	Swift
const num = 28; num = 70;	let num = 28; num = 70;	Cannot reassign const.	JavaScript
println('world')	println("world")	Double quotes.	Scala
var x int = 'output'	var x string = 'output'	Type mismatch.	Go
$list[95]	if ($list.Count -gt 95) {{ $list[95] }}	Check bounds.	PowerShell
int arr[46]; arr[46]=5;	int arr[46]; if(46<46){{}} else arr[46]=5;	Bounds check.	C++
for (int i=0; i<55; i++) {{}}	for (int i=0; i<55; i++) {{}}	Correct.	Java
function baz() {{ return {{key:'world'}} }}	function baz() {{ return {{key:'world'}}; }}	Return object on same line.	JavaScript
function bar() {{ echo 'data'; }}	function bar() {{ echo 'data'; }}	Correct.	PHP
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
try {{ throw 'result'; }} catch(e) {{}}	try {{ throw new Error('result'); }} catch(e) {{}}	Throw Error objects.	JavaScript
jwt.sign({{id:58}}, 'password');	jwt.sign({{id:58}}, 'password', {{expiresIn:'2h'}});	Add expiration.	Node.js
with open('log.txt') as file_handle: data = file_handle.read()	with open('log.txt') as file_handle: data = file_handle.read()	Correct.	Python
int[] list = new int[56]; list[56] = 5;	int[] list = new int[56]; if (56 < list.length) list[56] = 5;	Check bounds.	Java
var temp int = 'message'	var temp string = 'message'	Type mismatch.	Go
<div color=#333>	<div style='color:#333;'>	Use style attribute.	CSS
if bar = 23 {{}}	if bar == 23 {{}}	Use ==.	Swift
{{'id':'world'}}	{{"id":"world"}}	Use double quotes.	JSON
if ($val = 68)	if ($val == 68)	Use ==.	Perl
console.log('info'	console.log('info')	Close parenthesis.	JavaScript
DELETE FROM orders WHERE age=40	DELETE FROM orders WHERE age=40;	Add semicolon.	SQL
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
if (c = 18) {{}}	if (c == 18) {{}}	Use ==.	Java
let a: Int = 'world'	let a: String = 'world'	Fix type.	Swift
if (x = 84) {{}}	if (x === 84) {{}}	Use === for equality.	JavaScript
function bar(a) print(a) end	function bar(a) print(a) end	Correct.	Lua
if result = 96	if result == 96	Use ==.	Go
[4, 63, 81	[4, 63, 81]	Close bracket.	Ruby
else print('test')	else: print('test')	Colon after else.	Python
cin >> num cout << num;	cin >> num; cout << num;	Add semicolon.	C++
SELECT * FROM items WHRE id=28;	SELECT * FROM items WHERE id=28;	Fix WHERE.	SQL
<input type='text' value='info'>	<input type='text' value='info' name='age'>	Add name attribute.	HTML
$list[8] = 5;	if (isset($list[8])) $list[8] = 5;	Check existence.	PHP
function compute(): void {{ return 28; }}	function compute(): number {{ return 28; }}	Return type mismatch.	TypeScript

Colon missing.

Python

17num = 10

num17 = 10

Variable cannot start with digit.

Python

handle

handle()

Add parentheses.

Swift

<note><desc>message</desc><age>53</age></note

<note><desc>message</desc><age>53</age></note>

Add closing >.

XML

WHERE age = '84'

WHERE age = 84

Don't quote integer.

SQL

Correct.

XML

'10' + 17

10 + 17

Avoid string coercion.

JavaScript

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

Correct.

MATLAB

math.sqrt(100)

import math math.sqrt(100)

Import module first.

Python

print('world')

Correct.

R

Remove trailing comma.

JSON

lambda x: x+1

Correct lambda.

Python

// comment

/* comment */

Use /* */.

CSS

<br>

Self-closing.

HTML

div {{ color=green; }}

div {{ color: green; }}

Use colon.

CSS

if (bar = 46) {{}}

if (bar == 46) {{}}

Use ==.

Kotlin

while result > 98 result -= 1

while result > 98: result -= 1

Colon missing after while.

Python

console.log('data'

console.log('data')

Close parenthesis.

JavaScript

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

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

Initialize variable.

Java

data[54]

if (data.indices.contains(54)) data[54]

Check index.

Kotlin

let count = 'data'

let count = "data"

Double quotes.

Swift

Add comma.

JSON

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

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

Make field public.

Java

data(25)

if length(data) >= 25, data(25), end

Check length.

MATLAB

package main func main() {{}}

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

Import needed.

Go

for index in range(18) print(index)

for index in range(18): print(index)

Colon after for.

Python

String name = 'message';

Correct.

Dart

if data = 59 then print('result') end

if data == 59 then print('result') end

Use ==.

Lua

User.save();

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

Handle promise.

Node.js

cin >> item;

int item; cin >> item;

Declare variable.

C++

arr.forEach(function(item) {{ console.log(item); }})

arr.forEach((item) => {{ console.log(item); }})

Arrow functions are cleaner.

JavaScript

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

for i=1,13 do print(i) end

Correct.

Lua

{ "name": "data" }

Correct.

JSON

h1 {{ font-size:67px color:red; }}

h1 {{ font-size:67px; color:red; }}

Add semicolon.

CSS

def test(foo): return foo + 1

Correct.

Python

let text1 = String::from("result"); let s2 = text1; println!("{{}}", text1);

let text1 = String::from("result"); let s2 = text1.clone(); println!("{{}}", text1);

Clone to avoid move.

Rust

print 'output'

print('output')

print needs parentheses.

Python

let s = String::from("message"); let borrow=&s; s.push_str("!");

let mut s = String::from("message"); let borrow=&s; println!("{{}}", borrow); s.push_str("!");

Cannot mutate while borrowed.

Rust

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

if (y = 5)

if (y == 5)

Use ==.

Scala

assert b > 40

Correct.

Python

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

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

Add semicolon.

Dart

System.out.println('value')

System.out.println('value');

Add semicolon.

Java

cin >> temp cout << temp;

cin >> temp; cout << temp;

Add semicolon.

C++

if (num = 62) {}

if (num == 62) {}

Use ==.

Dart

let b = 89;

Correct.

JavaScript

class = 'value'

class_name = 'value'

'class' is a keyword.

Python

val foo = 'output'

val foo = "output"

Double quotes.

Kotlin

if (temp = 92)

if (temp == 92)

Use ==.

R

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

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

Declare before use.

C++

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

class Child Super:

class Child(Super):

Inheritance uses parentheses.

Python

function handle(): void {{ return 8; }}

function handle(): number {{ return 8; }}

Return type mismatch.

TypeScript

b > 73 & x < 22

b > 73 and x < 22

Use 'and' not '&'.

Python

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

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

const person:Person = {{name:'message', age:30}};

Add missing property.

TypeScript

if temp = 32:

if temp == 32:

Use == for comparison.

Python

let bar = 9; let bar = 81;

let bar = 9; bar = 81;

Duplicate declaration.

JavaScript

a = output

a = 'output'

Quote strings.

Python

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

Correct.

Shell

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

Correct.

Dart

local bar = 82

Correct.

Lua

id: output status: world,

id: output status: world

Remove comma.

YAML

jwt.sign({{id:19}}, 'password');

jwt.sign({{id:19}}, 'password', {{expiresIn:'7d'}});

Add expiration.

Node.js

if ($z = 1) {{}}

if ($z -eq 1) {{}}

Use -eq.

PowerShell

items[75]

if items.indices.contains(75) {{ items[75] }}

Check index.

Swift

const num = 28; num = 70;

let num = 28; num = 70;

Cannot reassign const.

JavaScript

println('world')

println("world")

Double quotes.

Scala

var x int = 'output'

var x string = 'output'

Type mismatch.

Go

$list[95]

if ($list.Count -gt 95) {{ $list[95] }}

Check bounds.

PowerShell

int arr[46]; arr[46]=5;

int arr[46]; if(46<46){{}} else arr[46]=5;

Bounds check.

C++

for (int i=0; i<55; i++) {{}}

Correct.

Java

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

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

Return object on same line.

JavaScript

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

Correct.

PHP

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

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

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

Throw Error objects.

JavaScript

jwt.sign({{id:58}}, 'password');

jwt.sign({{id:58}}, 'password', {{expiresIn:'2h'}});

Add expiration.

Node.js

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

Correct.

Python

int[] list = new int[56]; list[56] = 5;

int[] list = new int[56]; if (56 < list.length) list[56] = 5;

Check bounds.

Java

var temp int = 'message'

var temp string = 'message'

Type mismatch.

Go

Use style attribute.

CSS

if bar = 23 {{}}

if bar == 23 {{}}

Use ==.

Swift

Use double quotes.

JSON

if ($val = 68)

if ($val == 68)

Use ==.

Perl

console.log('info'

console.log('info')

Close parenthesis.

JavaScript

DELETE FROM orders WHERE age=40

DELETE FROM orders WHERE age=40;

Add semicolon.

SQL

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

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

Type not in union.

TypeScript

if (c = 18) {{}}

if (c == 18) {{}}

Use ==.

Java

let a: Int = 'world'

let a: String = 'world'

Fix type.

Swift

if (x = 84) {{}}

if (x === 84) {{}}

Use === for equality.

JavaScript

function bar(a) print(a) end

Correct.

Lua

if result = 96

if result == 96

Use ==.

Go

[4, 63, 81

[4, 63, 81]

Close bracket.

Ruby

else print('test')

else: print('test')

Colon after else.

Python

cin >> num cout << num;

cin >> num; cout << num;

Add semicolon.

C++

SELECT * FROM items WHRE id=28;

SELECT * FROM items WHERE id=28;

Fix WHERE.

SQL

Add name attribute.

HTML

$list[8] = 5;

if (isset($list[8])) $list[8] = 5;

Check existence.

PHP

function compute(): void {{ return 28; }}

function compute(): number {{ return 28; }}

Return type mismatch.

TypeScript