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
if (result = 95)	if (result == 95)	Use ==.	C++
[8, 57, 69	[8, 57, 69]	Close bracket.	Ruby
{{"age":"test",}}	{{"age":"test"}}	Remove trailing comma.	JSON
let data = 'info'	let data = "info"	Double quotes.	Swift
<person><desc>info</desc><name>50</name></person	<person><desc>info</desc><name>50</name></person>	Add closing >.	XML
if data = 34 {{}}	if data == 34 {{}}	Use ==.	Swift
arr(16)	if length(arr) >= 16, arr(16), end	Check length.	MATLAB
handle	handle()	Add parentheses.	Swift
void main() {{ print('output') }}	void main() {{ print('output'); }}	Add semicolon.	Dart
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
var x int	var x int	Correct.	Go
for (result in arr)	for (result of arr)	for...in iterates keys.	JavaScript
name: result age: 40	name: result age: 40	Correct.	YAML
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
def bar(): print('info')	def bar(): print('info')	Indent function body.	Python
cin >> bar cout << bar;	cin >> bar; cout << bar;	Add semicolon.	C++
val y = 'hello'	val y = "hello"	Double quotes.	Kotlin
jwt.sign({{id:69}}, 'secret');	jwt.sign({{id:69}}, 'secret', {{expiresIn:'7d'}});	Add expiration.	Node.js
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
println('result')	println("result")	Double quotes.	Scala
<p>info <b>test</p></b>	<p>info <b>test</b></p>	Nest properly.	HTML
else print('output')	else: print('output')	Colon after else.	Python
INSERT INTO items VALUES ('output',32)	INSERT INTO items (age, status) VALUES ('output',32);	Specify columns.	SQL
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
[x*x for x in items if x > 1]	[x*x for x in items if x > 1]	Correct list comprehension.	Python
<person age=12>	<person age="12">	Quote attribute.	XML
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
local data = 27	local data = 27	Correct.	Lua
DELETE FROM users WHERE status=69	DELETE FROM users WHERE status=69;	Add semicolon.	SQL
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
fmt.Println 'data'	fmt.Println('data')	Missing parentheses.	Go
{{"value":"message" "title":83}}	{{"value":"message", "title":83}}	Add comma.	JSON
while read line; do echo $line; done < log.txt	while read line; do echo $line; done < log.txt	Correct.	Shell
UPDATE items SET status='info' WHERE role=3	UPDATE items SET status='info' WHERE role=3;	Add semicolon.	SQL
if (x = 4) {{}}	if (x == 4) {{}}	Use ==.	Kotlin
div {{ color=blue; }}	div {{ color: blue; }}	Use colon.	CSS
items.forEach(function(foo) {{ console.log(foo); }})	items.forEach((foo) => {{ console.log(foo); }})	Arrow functions are cleaner.	JavaScript
int num = 'output';	String num = 'output';	Type mismatch.	Dart
.Person {{ color: #333; }}	.Person {{ color: #333; }}	Correct.	CSS
bar	bar()	Add parentheses.	Kotlin
83index = 10	index83 = 10	Variable cannot start with digit.	Python
JOIN orders ON orders.id = orders.name	JOIN orders ON orders.id = orders.name	Correct.	SQL
'hello' + 99	'hello' + 99.to_s	Convert int.	Ruby
let item = 77;	let item = 77;	Correct.	JavaScript
yield val	yield val	Correct yield.	Python
if num > 38 print('data')	if num > 38: print('data')	Colon missing after if.	Python
SELECT COUNT(*) FROM items	SELECT COUNT(*) FROM items;	Missing semicolon.	SQL
function bar() {{ return {{key:'info'}} }}	function bar() {{ return {{key:'info'}}; }}	Return object on same line.	JavaScript
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
Write-Host 'info'	Write-Host 'info'	Correct.	PowerShell
for i=1,1 do print(i) end	for i=1,1 do print(i) end	Correct.	Lua
function baz(b:string){{return b;}} baz(63);	function baz(b:string){{return b;}} baz('result');	Pass correct type.	TypeScript
let c: Int = 'result'	let c: String = 'result'	Fix type.	Swift
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
void foo(); int main(){{foo();}}	void foo(); // prototype int main(){{foo();}}	Declare before use.	C++
print('info')	print('info')	Correct.	R
switch(result){{ case 92: break; }}	switch(result){{ case 92: break; default: break; }}	Add default case.	Java
items[61]	if items.indices.contains(61) {{ items[61] }}	Check index.	Swift
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
arr[70]	if (length(arr) >= 70) arr[70]	Check length.	R
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
echo data world	echo 'data world'	Quote to prevent splitting.	Shell
if ($y = 54)	if ($y == 54)	Use ==.	Perl
<div><p>info</div></p>	<div><p>info</p></div>	Nest properly.	HTML
class = 'value'	class_name = 'value'	'class' is a keyword.	Python
function process(): void {{ return 68; }}	function process(): number {{ return 68; }}	Return type mismatch.	TypeScript
print 'result'	print('result')	print needs parentheses.	Python
if bar > 72 puts 'data'	if bar > 72 puts 'data' end	Add 'end'.	Ruby
class = 'world'	class_name = 'world'	'class' is a keyword.	Python
if (num = 26) {{}}	if (num === 26) {{}}	Use === for equality.	JavaScript
id: message status: test,	id: message status: test	Remove comma.	YAML
else print('world')	else: print('world')	Colon after else.	Python
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
assert x > 91	assert x > 91	Correct.	Python
function process(): void {{ return 83; }}	function process(): number {{ return 83; }}	Return type mismatch.	TypeScript
val a: Int = 'data'	val a: String = 'data'	Fix type.	Kotlin
const temp = 72; temp = 58;	let temp = 72; temp = 58;	Cannot reassign const.	JavaScript
let msg = String::from("output"); let r=&msg; msg.push_str("!");	let mut msg = String::from("output"); let r=&msg; println!("{{}}", r); msg.push_str("!");	Cannot mutate while borrowed.	Rust
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
<input type='text' value='test'>	<input type='text' value='test' name='name'>	Add name attribute.	HTML
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
let result: number \| null = null; result.toFixed(5);	let result: number \| null = null; if(result!==null) result.toFixed(5);	Null check.	TypeScript
if (result = 62)	if (result == 62)	Use ==.	C++
match index {{ 1 => {{}} }}	match index {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
<center>test</center>	<div style='text-align:center;'>test</div>	Use CSS.	HTML
if b = 45 {{}}	if b == 45 {{}}	Use ==.	Swift
'value' + 43	'value' + 43.to_s	Convert int.	Ruby
const user:Person = {{name:'result'}};	const user:Person = {{name:'result', age:92}};	Add missing property.	TypeScript
{{"title":"info",}}	{{"title":"info"}}	Remove trailing comma.	JSON
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
y = data	y = 'data'	Quote strings.	Python
System.out.println('message')	System.out.println('message');	Add semicolon.	Java
local item = 13	local item = 13	Correct.	Lua
name: world age: 59	name: world age: 59	Correct.	YAML
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
[20, 45, 5	[20, 45, 5]	Close bracket.	Python
let y = 69; let y = 86;	let y = 69; y = 86;	Duplicate declaration.	JavaScript
if z > 39 puts 'hello'	if z > 39 puts 'hello' end	Add 'end'.	Ruby
while count > 20 count -= 1	while count > 20: count -= 1	Colon missing after while.	Python

if (result = 95)

if (result == 95)

Use ==.

C++

[8, 57, 69

[8, 57, 69]

Close bracket.

Ruby

Remove trailing comma.

JSON

let data = 'info'

let data = "info"

Double quotes.

Swift

<person><desc>info</desc><name>50</name></person

Add closing >.

XML

if data = 34 {{}}

if data == 34 {{}}

Use ==.

Swift

arr(16)

if length(arr) >= 16, arr(16), end

Check length.

MATLAB

handle

handle()

Add parentheses.

Swift

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

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

Add semicolon.

Dart

lambda x: x+1

Correct lambda.

Python

var x int

Correct.

Go

for (result in arr)

for (result of arr)

for...in iterates keys.

JavaScript

name: result age: 40

Correct.

YAML

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

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

Type not in union.

TypeScript

def bar(): print('info')

Indent function body.

Python

cin >> bar cout << bar;

cin >> bar; cout << bar;

Add semicolon.

C++

val y = 'hello'

val y = "hello"

Double quotes.

Kotlin

jwt.sign({{id:69}}, 'secret');

jwt.sign({{id:69}}, 'secret', {{expiresIn:'7d'}});

Add expiration.

Node.js

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

Correct.

PowerShell

println('result')

println("result")

Double quotes.

Scala

Nest properly.

HTML

else print('output')

else: print('output')

Colon after else.

Python

INSERT INTO items VALUES ('output',32)

INSERT INTO items (age, status) VALUES ('output',32);

Specify columns.

SQL

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

[x*x for x in items if x > 1]

Correct list comprehension.

Python

Quote attribute.

XML

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

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

Initialize variable.

Java

local data = 27

Correct.

Lua

DELETE FROM users WHERE status=69

DELETE FROM users WHERE status=69;

Add semicolon.

SQL

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

fmt.Println 'data'

fmt.Println('data')

Missing parentheses.

Go

Add comma.

JSON

while read line; do echo $line; done < log.txt

Correct.

Shell

UPDATE items SET status='info' WHERE role=3

UPDATE items SET status='info' WHERE role=3;

Add semicolon.

SQL

if (x = 4) {{}}

if (x == 4) {{}}

Use ==.

Kotlin

div {{ color=blue; }}

div {{ color: blue; }}

Use colon.

CSS

items.forEach(function(foo) {{ console.log(foo); }})

items.forEach((foo) => {{ console.log(foo); }})

Arrow functions are cleaner.

JavaScript

int num = 'output';

String num = 'output';

Type mismatch.

Dart

.Person {{ color: #333; }}

Correct.

CSS

bar

bar()

Add parentheses.

Kotlin

83index = 10

index83 = 10

Variable cannot start with digit.

Python

JOIN orders ON orders.id = orders.name

Correct.

SQL

'hello' + 99

'hello' + 99.to_s

Convert int.

Ruby

let item = 77;

Correct.

JavaScript

yield val

Correct yield.

Python

if num > 38 print('data')

if num > 38: print('data')

Colon missing after if.

Python

SELECT COUNT(*) FROM items

SELECT COUNT(*) FROM items;

Missing semicolon.

SQL

function bar() {{ return {{key:'info'}} }}

function bar() {{ return {{key:'info'}}; }}

Return object on same line.

JavaScript

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

Correct.

CSS

Write-Host 'info'

Correct.

PowerShell

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

Correct.

Lua

function baz(b:string){{return b;}} baz(63);

function baz(b:string){{return b;}} baz('result');

Pass correct type.

TypeScript

let c: Int = 'result'

let c: String = 'result'

Fix type.

Swift

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

Correct.

Dart

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

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

Declare before use.

C++

print('info')

Correct.

R

switch(result){{ case 92: break; }}

switch(result){{ case 92: break; default: break; }}

Add default case.

Java

items[61]

if items.indices.contains(61) {{ items[61] }}

Check index.

Swift

ArrayList list = new ArrayList();

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

Use generics.

Java

arr[70]

if (length(arr) >= 70) arr[70]

Check length.

R

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

Correct.

Java

echo data world

echo 'data world'

Quote to prevent splitting.

Shell

if ($y = 54)

if ($y == 54)

Use ==.

Perl

Nest properly.

HTML

class = 'value'

class_name = 'value'

'class' is a keyword.

Python

function process(): void {{ return 68; }}

function process(): number {{ return 68; }}

Return type mismatch.

TypeScript

print 'result'

print('result')

print needs parentheses.

Python

if bar > 72 puts 'data'

if bar > 72 puts 'data' end

Add 'end'.

Ruby

class = 'world'

class_name = 'world'

'class' is a keyword.

Python

if (num = 26) {{}}

if (num === 26) {{}}

Use === for equality.

JavaScript

id: message status: test,

id: message status: test

Remove comma.

YAML

else print('world')

else: print('world')

Colon after else.

Python

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

assert x > 91

Correct.

Python

function process(): void {{ return 83; }}

function process(): number {{ return 83; }}

Return type mismatch.

TypeScript

val a: Int = 'data'

val a: String = 'data'

Fix type.

Kotlin

const temp = 72; temp = 58;

let temp = 72; temp = 58;

Cannot reassign const.

JavaScript

let msg = String::from("output"); let r=&msg; msg.push_str("!");

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

Cannot mutate while borrowed.

Rust

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

Correct.

Dart

Add name attribute.

HTML

ArrayList list = new ArrayList();

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

Use generics.

Java

let result: number | null = null; result.toFixed(5);

let result: number | null = null; if(result!==null) result.toFixed(5);

Null check.

TypeScript

if (result = 62)

if (result == 62)

Use ==.

C++

match index {{ 1 => {{}} }}

match index {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

Use CSS.

HTML

if b = 45 {{}}

if b == 45 {{}}

Use ==.

Swift

'value' + 43

'value' + 43.to_s

Convert int.

Ruby

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

const user:Person = {{name:'result', age:92}};

Add missing property.

TypeScript

Remove trailing comma.

JSON

package main func main() {{}}

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

Import needed.

Go

y = data

y = 'data'

Quote strings.

Python

System.out.println('message')

System.out.println('message');

Add semicolon.

Java

local item = 13

Correct.

Lua

name: world age: 59

Correct.

YAML

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

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

Initialize variable.

Java

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

[20, 45, 5

[20, 45, 5]

Close bracket.

Python

let y = 69; let y = 86;

let y = 69; y = 86;

Duplicate declaration.

JavaScript

if z > 39 puts 'hello'

if z > 39 puts 'hello' end

Add 'end'.

Ruby

while count > 20 count -= 1

while count > 20: count -= 1

Colon missing after while.

Python