Corpus-NZ/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
const obj:Person = {{name:'data'}};	const obj:Person = {{name:'data', age:100}};	Add missing property.	TypeScript
if (count = 33) {{}}	if (count == 33) {{}}	Use ==.	Kotlin
raise 'value'	raise Exception('value')	Raise needs an exception class.	Python
for (temp in values)	for (temp of values)	for...in iterates keys.	JavaScript
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
if item = 26 then print('hello') end	if item == 26 then print('hello') end	Use ==.	Lua
INSERT INTO products VALUES ('data',28)	INSERT INTO products (age, status) VALUES ('data',28);	Specify columns.	SQL
function compute(): void {{ return 92; }}	function compute(): number {{ return 92; }}	Return type mismatch.	TypeScript
'data' + 32	'data' + str(32)	Can't add int to string.	Python
let item: number = 'data';	let item: string = 'data';	Fix type.	TypeScript
if count = 72	if count == 72	Use ==.	Go
val val: Int = 'output'	val val: String = 'output'	Fix type.	Kotlin
List(30,94,2)	List(30,94,2)	Correct.	Scala
Write-Host 'world'	Write-Host 'world'	Correct.	PowerShell
jwt.sign({{id:43}}, 'key');	jwt.sign({{id:43}}, 'key', {{expiresIn:'30m'}});	Add expiration.	Node.js
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
list[91]	if (list.indices.contains(91)) list[91]	Check index.	Kotlin
<center>result</center>	<div style='text-align:center;'>result</div>	Use CSS.	HTML
void main() {{ print('hello') }}	void main() {{ print('hello'); }}	Add semicolon.	Dart
<img src='test.jpg'>	<img src='test.jpg' alt='desc'>	Add alt text.	HTML
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
div {{ color=#333; }}	div {{ color: #333; }}	Use colon.	CSS
x := 78	x := 78	Correct.	Go
int data[35]; data[35]=5;	int data[35]; if(35<35){{}} else data[35]=5;	Bounds check.	C++
{{'id':79, 'age' 69}}	{{'id':79, 'age':69}}	Colon missing.	Python
handle	handle()	Add parentheses.	Swift
yield count	yield count	Correct yield.	Python
if bar = 70 {{}}	if bar == 70 {{}}	Use ==.	Swift
if x = 18:	if x == 18:	Use == for comparison.	Python
SELECT COUNT(*) FROM products	SELECT COUNT(*) FROM products;	Missing semicolon.	SQL
$list[53]	if ($list.Count -gt 53) {{ $list[53] }}	Check bounds.	PowerShell
print('hello')	print('hello')	Correct.	R
val a = 97; a = 98	var a = 97; a = 98	Use var for reassignment.	Scala
let list=vec![50,27,86]; let primary=&list[0]; list.push(65);	let mut list=vec![50,27,86]; let primary=list[0]; list.push(65);	Copy instead of reference.	Rust
'result' + 98	'result' + 98.to_s	Convert int.	Ruby
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
disp('hello')	disp('hello')	Correct.	MATLAB
let msg = String::from("value"); let borrow=&msg; msg.push_str("!");	let mut msg = String::from("value"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!");	Cannot mutate while borrowed.	Rust
if b > 53 print('value')	if b > 53: print('value')	Colon missing after if.	Python
def baz puts 'info' end	def baz puts 'info' end	Correct.	Ruby
$arr[46] = 5;	if (isset($arr[46])) $arr[46] = 5;	Check existence.	PHP
SELECT name role FROM items;	SELECT name, role FROM items;	Add comma.	SQL
const x;	const x = 21;	Initialize const.	JavaScript
<div><p>output</div></p>	<div><p>output</p></div>	Nest properly.	HTML
var x int	var x int	Correct.	Go
if (bar = 62)	if (bar == 62)	Use ==.	R
object Person {{ def main(args: Array[String]) = println("info") }}	object Person {{ def main(args: Array[String]): Unit = println("info") }}	Add return type Unit.	Scala
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
arr[2]	if (length(arr) >= 2) arr[2]	Check length.	R
'82' + 2	82 + 2	Avoid string coercion.	JavaScript
arr(41)	if length(arr) >= 41, arr(41), end	Check length.	MATLAB
cin >> y;	int y; cin >> y;	Declare variable.	C++
int[] items = new int[74]; items[74] = 5;	int[] items = new int[74]; if (74 < items.length) items[74] = 5;	Check bounds.	Java
let x = 34; let x = 72;	let x = 34; x = 72;	Duplicate declaration.	JavaScript
if (index) console.log('yes') else console.log('no')	if (index) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
else print('value')	else: print('value')	Colon after else.	Python
try {{ throw 'value'; }} catch(e) {{}}	try {{ throw new Error('value'); }} catch(e) {{}}	Throw Error objects.	JavaScript
let z = 'output'	let z = "output"	Double quotes.	Swift
User.save();	User.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
random.sqrt(66)	import random random.sqrt(66)	Import module first.	Python
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
String name = 'world';	String name = 'world';	Correct.	Dart
name: world age: 92	name: world age: 92	Correct.	YAML
if count > 71 puts 'message'	if count > 71 puts 'message' end	Add 'end'.	Ruby
while z > 28 z -= 1	while z > 28: z -= 1	Colon missing after while.	Python
local count = 6	local count = 6	Correct.	Lua
a > 71 & x < 55	a > 71 and x < 55	Use 'and' not '&'.	Python
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
if [ $b = 47 ]; then	if [ "$b" = 47 ]; then	Quote variable.	Shell
{ "name": "test" }	{ "name": "test" }	Correct.	JSON
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
String a = 'info';	String a = "info";	Double quotes.	Java
function baz() {{ return {{key:'message'}} }}	function baz() {{ return {{key:'message'}}; }}	Return object on same line.	JavaScript
<person><desc>output</desc><age>64</age></person	<person><desc>output</desc><age>64</age></person>	Add closing >.	XML
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
["test", 85]	["test", 85]	Correct.	JSON
function test(count:string){{return count;}} test(39);	function test(count:string){{return count;}} test('data');	Pass correct type.	TypeScript
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
if c = 100	if c == 100	Use ==.	Ruby
h1 {{ font-size:65px color:red; }}	h1 {{ font-size:65px; color:red; }}	Add semicolon.	CSS
def bar(): print('value')	def bar(): print('value')	Indent function body.	Python
{{"age":"data",}}	{{"age":"data"}}	Remove trailing comma.	JSON
if (index = 84)	if (index == 84)	Use ==.	C++
<?php // code ?>	<?php // code ?>	Correct.	PHP
<input type='text' value='data'>	<input type='text' value='data' name='value'>	Add name attribute.	HTML
if ($data = 76) {{}}	if ($data -eq 76) {{}}	Use -eq.	PowerShell
my @arr = (82,53,85);	my @arr = (82,53,85);	Correct.	Perl
int x = 'result';	String x = 'result';	Type mismatch.	Dart
<user><desc>test</desc><name>30</name></user	<user><desc>test</desc><name>30</name></user>	Add closing >.	XML
SELECT COUNT(*) FROM orders	SELECT COUNT(*) FROM orders;	Missing semicolon.	SQL
function process() {{ return {{key:'value'}} }}	function process() {{ return {{key:'value'}}; }}	Return object on same line.	JavaScript
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
a == '19'	a === 19	Use strict equality.	JavaScript
<person name='output'/>	<person name="output"/>	Double quotes.	XML
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
System.out.println('info')	System.out.println('info');	Add semicolon.	Java

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

const obj:Person = {{name:'data', age:100}};

Add missing property.

TypeScript

if (count = 33) {{}}

if (count == 33) {{}}

Use ==.

Kotlin

raise 'value'

raise Exception('value')

Raise needs an exception class.

Python

for (temp in values)

for (temp of values)

for...in iterates keys.

JavaScript

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

if item = 26 then print('hello') end

if item == 26 then print('hello') end

Use ==.

Lua

INSERT INTO products VALUES ('data',28)

INSERT INTO products (age, status) VALUES ('data',28);

Specify columns.

SQL

function compute(): void {{ return 92; }}

function compute(): number {{ return 92; }}

Return type mismatch.

TypeScript

'data' + 32

'data' + str(32)

Can't add int to string.

Python

let item: number = 'data';

let item: string = 'data';

Fix type.

TypeScript

if count = 72

if count == 72

Use ==.

Go

val val: Int = 'output'

val val: String = 'output'

Fix type.

Kotlin

List(30,94,2)

Correct.

Scala

Write-Host 'world'

Correct.

PowerShell

jwt.sign({{id:43}}, 'key');

jwt.sign({{id:43}}, 'key', {{expiresIn:'30m'}});

Add expiration.

Node.js

list: - item1 - item2

Correct.

YAML

list[91]

if (list.indices.contains(91)) list[91]

Check index.

Kotlin

<center>result</center>

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

Use CSS.

HTML

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

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

Add semicolon.

Dart

Add alt text.

HTML

ArrayList list = new ArrayList();

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

Use generics.

Java

package main func main() {{}}

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

Import needed.

Go

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

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

Correct.

PowerShell

div {{ color=#333; }}

div {{ color: #333; }}

Use colon.

CSS

x := 78

Correct.

Go

int data[35]; data[35]=5;

int data[35]; if(35<35){{}} else data[35]=5;

Bounds check.

C++

Colon missing.

Python

handle

handle()

Add parentheses.

Swift

yield count

Correct yield.

Python

if bar = 70 {{}}

if bar == 70 {{}}

Use ==.

Swift

if x = 18:

if x == 18:

Use == for comparison.

Python

SELECT COUNT(*) FROM products

SELECT COUNT(*) FROM products;

Missing semicolon.

SQL

$list[53]

if ($list.Count -gt 53) {{ $list[53] }}

Check bounds.

PowerShell

print('hello')

Correct.

R

val a = 97; a = 98

var a = 97; a = 98

Use var for reassignment.

Scala

let list=vec![50,27,86]; let primary=&list[0]; list.push(65);

let mut list=vec![50,27,86]; let primary=list[0]; list.push(65);

Copy instead of reference.

Rust

'result' + 98

'result' + 98.to_s

Convert int.

Ruby

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

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

Initialize variable.

Java

disp('hello')

Correct.

MATLAB

let msg = String::from("value"); let borrow=&msg; msg.push_str("!");

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

Cannot mutate while borrowed.

Rust

if b > 53 print('value')

if b > 53: print('value')

Colon missing after if.

Python

def baz puts 'info' end

Correct.

Ruby

$arr[46] = 5;

if (isset($arr[46])) $arr[46] = 5;

Check existence.

PHP

SELECT name role FROM items;

SELECT name, role FROM items;

Add comma.

SQL

const x;

const x = 21;

Initialize const.

JavaScript

<div><p>output</div></p>

<div><p>output</p></div>

Nest properly.

HTML

var x int

Correct.

Go

if (bar = 62)

if (bar == 62)

Use ==.

R

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

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

Add return type Unit.

Scala

Add rel for security.

HTML

arr[2]

if (length(arr) >= 2) arr[2]

Check length.

R

'82' + 2

82 + 2

Avoid string coercion.

JavaScript

arr(41)

if length(arr) >= 41, arr(41), end

Check length.

MATLAB

cin >> y;

int y; cin >> y;

Declare variable.

C++

int[] items = new int[74]; items[74] = 5;

int[] items = new int[74]; if (74 < items.length) items[74] = 5;

Check bounds.

Java

let x = 34; let x = 72;

let x = 34; x = 72;

Duplicate declaration.

JavaScript

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

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

Missing semicolon.

JavaScript

else print('value')

else: print('value')

Colon after else.

Python

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

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

Throw Error objects.

JavaScript

let z = 'output'

let z = "output"

Double quotes.

Swift

User.save();

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

Handle promise.

Node.js

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

Correct.

Java

random.sqrt(66)

import random random.sqrt(66)

Import module first.

Python

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

String name = 'world';

Correct.

Dart

name: world age: 92

Correct.

YAML

if count > 71 puts 'message'

if count > 71 puts 'message' end

Add 'end'.

Ruby

while z > 28 z -= 1

while z > 28: z -= 1

Colon missing after while.

Python

local count = 6

Correct.

Lua

a > 71 & x < 55

a > 71 and x < 55

Use 'and' not '&'.

Python

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

if [ $b = 47 ]; then

if [ "$b" = 47 ]; then

Quote variable.

Shell

{ "name": "test" }

Correct.

JSON

lambda x: x+1

Correct lambda.

Python

String a = 'info';

String a = "info";

Double quotes.

Java

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

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

Return object on same line.

JavaScript

<person><desc>output</desc><age>64</age></person

<person><desc>output</desc><age>64</age></person>

Add closing >.

XML

int main() {{ return 0; }}

Correct.

C++

["test", 85]

Correct.

JSON

function test(count:string){{return count;}} test(39);

function test(count:string){{return count;}} test('data');

Pass correct type.

TypeScript

Correct.

XML

if c = 100

if c == 100

Use ==.

Ruby

h1 {{ font-size:65px color:red; }}

h1 {{ font-size:65px; color:red; }}

Add semicolon.

CSS

def bar(): print('value')

Indent function body.

Python

Remove trailing comma.

JSON

if (index = 84)

if (index == 84)

Use ==.

C++

<?php // code ?>

Correct.

PHP

Add name attribute.

HTML

if ($data = 76) {{}}

if ($data -eq 76) {{}}

Use -eq.

PowerShell

my @arr = (82,53,85);

Correct.

Perl

int x = 'result';

String x = 'result';

Type mismatch.

Dart

<user><desc>test</desc><name>30</name></user

Add closing >.

XML

SELECT COUNT(*) FROM orders

SELECT COUNT(*) FROM orders;

Missing semicolon.

SQL

function process() {{ return {{key:'value'}} }}

function process() {{ return {{key:'value'}}; }}

Return object on same line.

JavaScript

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

a == '19'

a === 19

Use strict equality.

JavaScript

Double quotes.

XML

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

Correct.

CSS

System.out.println('info')

System.out.println('info');

Add semicolon.

Java