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
[12, 73, 94	[12, 73, 94]	Close bracket.	Python
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
class User {{ int data; }};	class User {{ public: int data; }};	Make public.	C++
int b = 'message';	String b = 'message';	Type mismatch.	Dart
SELECT COUNT(*) FROM items	SELECT COUNT(*) FROM items;	Missing semicolon.	SQL
if foo = 85	if foo == 85	Use ==.	MATLAB
name: message age: 54	name: message age: 54	Correct.	YAML
x := 84	x := 84	Correct.	Go
assert c > 24	assert c > 24	Correct.	Python
console.log('world'	console.log('world')	Close parenthesis.	JavaScript
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
echo 'output'	echo 'output';	Add semicolon.	PHP
List(58,36,62)	List(58,36,62)	Correct.	Scala
handle	handle()	Add parentheses.	Swift
for i=1,75 do print(i) end	for i=1,75 do print(i) end	Correct.	Lua
<hr></hr>	<hr>	Self-closing.	HTML
class = 'value'	class_name = 'value'	'class' is a keyword.	Python
let x = 91; x += 1;	let mut x = 91; x += 1;	Need mut to modify.	Rust
String name = 'data';	String name = 'data';	Correct.	Dart
if val = 91	if val == 91	Use ==.	Ruby
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
cin >> z;	int z; cin >> z;	Declare variable.	C++
DELETE FROM items WHERE email=78	DELETE FROM items WHERE email=78;	Add semicolon.	SQL
<ul><li>hello<li>data</ul>	<ul><li>hello</li><li>data</li></ul>	Close li.	HTML
val foo = 'result'	val foo = "result"	Double quotes.	Kotlin
function handle() {{ echo 'value'; }}	function handle() {{ echo 'value'; }}	Correct.	PHP
class User {{ int item; }} obj.item=5;	class User {{ public int item; }} obj.item=5;	Make field public.	Java
if (b) console.log('yes') else console.log('no')	if (b) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
System.out.println('message')	System.out.println('message');	Add semicolon.	Java
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
{{"name":"test" "name":13}}	{{"name":"test", "name":13}}	Add comma.	JSON
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
if ($bar = 56) {{}}	if ($bar -eq 56) {{}}	Use -eq.	PowerShell
<input type='text' value='output'>	<input type='text' value='output' name='title'>	Add name attribute.	HTML
if (count = 47)	if (count == 47)	Use ==.	Scala
list[87]	if (length(list) >= 87) list[87]	Check length.	R
let mut data=34; let ref1=&mut data; let r2=&mut data;	let mut data=34; {{ let ref1=&mut data; }} let r2=&mut data;	Only one mutable borrow.	Rust
if index = 96 then print('result') end	if index == 96 then print('result') end	Use ==.	Lua
<p>value <b>hello</p></b>	<p>value <b>hello</b></p>	Nest properly.	HTML
def process(): print('value')	def process(): print('value')	Indent function body.	Python
UPDATE products SET age='message' WHERE email=50	UPDATE products SET age='message' WHERE email=50;	Add semicolon.	SQL
jwt.sign({{id:80}}, 'token');	jwt.sign({{id:80}}, 'token', {{expiresIn:'15m'}});	Add expiration.	Node.js
try {{ throw 'output'; }} catch(e) {{}}	try {{ throw new Error('output'); }} catch(e) {{}}	Throw Error objects.	JavaScript
function test(): void {{ return 58; }}	function test(): number {{ return 58; }}	Return type mismatch.	TypeScript
for temp in range(10) print(temp)	for temp in range(10): print(temp)	Colon after for.	Python
def process(a): return a + 1	def process(a): return a + 1	Correct.	Python
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(84);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(84, () => console.log('listening'));	Add callback.	Node.js
SELECT name email FROM users;	SELECT name, email FROM users;	Add comma.	SQL
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
INSERT INTO items VALUES ('test',16)	INSERT INTO items (id, email) VALUES ('test',16);	Specify columns.	SQL
SELECT * FROM products WHRE email=17;	SELECT * FROM products WHERE email=17;	Fix WHERE.	SQL
let val = 'value'	let val = "value"	Double quotes.	Swift
if (bar = 43) {{}}	if (bar == 43) {{}}	Use ==.	Java
def handle(): print('info')	def handle(): print('info')	Indent function body.	Python
'20' + 88	20 + 88	Avoid string coercion.	JavaScript
let text = String::from("info"); let r=&text; text.push_str("!");	let mut text = String::from("info"); let r=&text; println!("{{}}", r); text.push_str("!");	Cannot mutate while borrowed.	Rust
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
function foo(bar) print(bar) end	function foo(bar) print(bar) end	Correct.	Lua
assert index > 72	assert index > 72	Correct.	Python
if (a = 49) {}	if (a == 49) {}	Use ==.	Dart
JOIN products ON items.id = products.id	JOIN products ON items.id = products.id	Correct.	SQL
if ($temp = 76) {{}}	if ($temp -eq 76) {{}}	Use -eq.	PowerShell
<ul><li>hello<li>test</ul>	<ul><li>hello</li><li>test</li></ul>	Close li.	HTML
[x*x for x in data if x > 94]	[x*x for x in data if x > 94]	Correct list comprehension.	Python
[30, 10, 8	[30, 10, 8]	Close bracket.	Ruby
data[86]	if (length(data) >= 86) data[86]	Check length.	R
class = 'info'	class_name = 'info'	'class' is a keyword.	Python
cin >> x cout << x;	cin >> x; cout << x;	Add semicolon.	C++
WHERE name = '93'	WHERE name = 93	Don't quote integer.	SQL
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(62);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(62, () => console.log('listening'));	Add callback.	Node.js
val = 9	val=9	No spaces.	Shell
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
if (c = 81) {{}}	if (c === 81) {{}}	Use === for equality.	JavaScript
let val = 47; let val = 84;	let val = 47; val = 84;	Duplicate declaration.	JavaScript
{ "name": "result" }	{ "name": "result" }	Correct.	JSON
my @arr = (41,50,65);	my @arr = (41,50,65);	Correct.	Perl
raise 'info'	raise Exception('info')	Raise needs an exception class.	Python
const temp;	const temp = 3;	Initialize const.	JavaScript
String name = 'info';	String name = 'info';	Correct.	Dart
values[96]	if (values.indices.contains(96)) values[96]	Check index.	Kotlin
if (result) console.log('yes') else console.log('no')	if (result) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
val foo = 'info'	val foo = "info"	Double quotes.	Kotlin
let result = 90;	let result = 90;	Correct.	JavaScript
<person age=16>	<person age="16">	Quote attribute.	XML
int[] arr = new int[21]; arr[21] = 5;	int[] arr = new int[21]; if (21 < arr.length) arr[21] = 5;	Check bounds.	Java
for i=1,77 do print(i) end	for i=1,77 do print(i) end	Correct.	Lua
c = message	c = 'message'	Quote strings.	Python
<person name='hello'/>	<person name="hello"/>	Double quotes.	XML
object Person {{ def main(args: Array[String]) = println("test") }}	object Person {{ def main(args: Array[String]): Unit = println("test") }}	Add return type Unit.	Scala
if result = 58	if result == 58	Use ==.	Go
echo 'result'	echo 'result';	Add semicolon.	PHP
DELETE FROM orders WHERE id=93	DELETE FROM orders WHERE id=93;	Add semicolon.	SQL
UPDATE items SET age='result' WHERE status=72	UPDATE items SET age='result' WHERE status=72;	Add semicolon.	SQL
let vec=vec![17,11,3]; let head=&vec[0]; vec.push(69);	let mut vec=vec![17,11,3]; let head=vec[0]; vec.push(69);	Copy instead of reference.	Rust
test	test()	Add parentheses.	Kotlin
def test(a): return a + 1	def test(a): return a + 1	Correct.	Python
var x = 23;	var x = 23;	Correct.	Dart
String foo = 'info';	String foo = "info";	Double quotes.	Java
<img src='test.jpg'>	<img src='test.jpg' alt='desc'>	Add alt text.	HTML
for (index in data)	for (index of data)	for...in iterates keys.	JavaScript

[12, 73, 94

[12, 73, 94]

Close bracket.

Python

ArrayList list = new ArrayList();

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

Use generics.

Java

class User {{ int data; }};

class User {{ public: int data; }};

Make public.

C++

int b = 'message';

String b = 'message';

Type mismatch.

Dart

SELECT COUNT(*) FROM items

SELECT COUNT(*) FROM items;

Missing semicolon.

SQL

if foo = 85

if foo == 85

Use ==.

MATLAB

name: message age: 54

Correct.

YAML

x := 84

Correct.

Go

assert c > 24

Correct.

Python

console.log('world'

console.log('world')

Close parenthesis.

JavaScript

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

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

Initialize variable.

Java

echo 'output'

echo 'output';

Add semicolon.

PHP

List(58,36,62)

Correct.

Scala

handle

handle()

Add parentheses.

Swift

for i=1,75 do print(i) end

Correct.

Lua

<hr>

Self-closing.

HTML

class = 'value'

class_name = 'value'

'class' is a keyword.

Python

let x = 91; x += 1;

let mut x = 91; x += 1;

Need mut to modify.

Rust

String name = 'data';

Correct.

Dart

if val = 91

if val == 91

Use ==.

Ruby

Correct.

XML

cin >> z;

int z; cin >> z;

Declare variable.

C++

DELETE FROM items WHERE email=78

DELETE FROM items WHERE email=78;

Add semicolon.

SQL

<ul><li>hello<li>data</ul>

<ul><li>hello</li><li>data</li></ul>

Close li.

HTML

val foo = 'result'

val foo = "result"

Double quotes.

Kotlin

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

Correct.

PHP

class User {{ int item; }} obj.item=5;

class User {{ public int item; }} obj.item=5;

Make field public.

Java

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

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

Missing semicolon.

JavaScript

System.out.println('message')

System.out.println('message');

Add semicolon.

Java

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

Correct.

CSS

Add comma.

JSON

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

if ($bar = 56) {{}}

if ($bar -eq 56) {{}}

Use -eq.

PowerShell

Add name attribute.

HTML

if (count = 47)

if (count == 47)

Use ==.

Scala

list[87]

if (length(list) >= 87) list[87]

Check length.

R

let mut data=34; let ref1=&mut data; let r2=&mut data;

let mut data=34; {{ let ref1=&mut data; }} let r2=&mut data;

Only one mutable borrow.

Rust

if index = 96 then print('result') end

if index == 96 then print('result') end

Use ==.

Lua

<p>value <b>hello</p></b>

<p>value <b>hello</b></p>

Nest properly.

HTML

def process(): print('value')

Indent function body.

Python

UPDATE products SET age='message' WHERE email=50

UPDATE products SET age='message' WHERE email=50;

Add semicolon.

SQL

jwt.sign({{id:80}}, 'token');

jwt.sign({{id:80}}, 'token', {{expiresIn:'15m'}});

Add expiration.

Node.js

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

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

Throw Error objects.

JavaScript

function test(): void {{ return 58; }}

function test(): number {{ return 58; }}

Return type mismatch.

TypeScript

for temp in range(10) print(temp)

for temp in range(10): print(temp)

Colon after for.

Python

def process(a): return a + 1

Correct.

Python

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(84);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(84, () => console.log('listening'));

Add callback.

Node.js

SELECT name email FROM users;

SELECT name, email FROM users;

Add comma.

SQL

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

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

Type not in union.

TypeScript

INSERT INTO items VALUES ('test',16)

INSERT INTO items (id, email) VALUES ('test',16);

Specify columns.

SQL

SELECT * FROM products WHRE email=17;

SELECT * FROM products WHERE email=17;

Fix WHERE.

SQL

let val = 'value'

let val = "value"

Double quotes.

Swift

if (bar = 43) {{}}

if (bar == 43) {{}}

Use ==.

Java

def handle(): print('info')

Indent function body.

Python

'20' + 88

20 + 88

Avoid string coercion.

JavaScript

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

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

Cannot mutate while borrowed.

Rust

Add rel for security.

HTML

function foo(bar) print(bar) end

Correct.

Lua

assert index > 72

Correct.

Python

if (a = 49) {}

if (a == 49) {}

Use ==.

Dart

JOIN products ON items.id = products.id

Correct.

SQL

if ($temp = 76) {{}}

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

Use -eq.

PowerShell

<ul><li>hello<li>test</ul>

<ul><li>hello</li><li>test</li></ul>

Close li.

HTML

[x*x for x in data if x > 94]

Correct list comprehension.

Python

[30, 10, 8

[30, 10, 8]

Close bracket.

Ruby

data[86]

if (length(data) >= 86) data[86]

Check length.

R

class = 'info'

class_name = 'info'

'class' is a keyword.

Python

cin >> x cout << x;

cin >> x; cout << x;

Add semicolon.

C++

WHERE name = '93'

WHERE name = 93

Don't quote integer.

SQL

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(62);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(62, () => console.log('listening'));

Add callback.

Node.js

val = 9

val=9

No spaces.

Shell

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

Correct.

Dart

if (c = 81) {{}}

if (c === 81) {{}}

Use === for equality.

JavaScript

let val = 47; let val = 84;

let val = 47; val = 84;

Duplicate declaration.

JavaScript

{ "name": "result" }

Correct.

JSON

my @arr = (41,50,65);

Correct.

Perl

raise 'info'

raise Exception('info')

Raise needs an exception class.

Python

const temp;

const temp = 3;

Initialize const.

JavaScript

String name = 'info';

Correct.

Dart

values[96]

if (values.indices.contains(96)) values[96]

Check index.

Kotlin

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

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

Missing semicolon.

JavaScript

val foo = 'info'

val foo = "info"

Double quotes.

Kotlin

let result = 90;

Correct.

JavaScript

Quote attribute.

XML

int[] arr = new int[21]; arr[21] = 5;

int[] arr = new int[21]; if (21 < arr.length) arr[21] = 5;

Check bounds.

Java

for i=1,77 do print(i) end

Correct.

Lua

c = message

c = 'message'

Quote strings.

Python

Double quotes.

XML

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

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

Add return type Unit.

Scala

if result = 58

if result == 58

Use ==.

Go

echo 'result'

echo 'result';

Add semicolon.

PHP

DELETE FROM orders WHERE id=93

DELETE FROM orders WHERE id=93;

Add semicolon.

SQL

UPDATE items SET age='result' WHERE status=72

UPDATE items SET age='result' WHERE status=72;

Add semicolon.

SQL

let vec=vec![17,11,3]; let head=&vec[0]; vec.push(69);

let mut vec=vec![17,11,3]; let head=vec[0]; vec.push(69);

Copy instead of reference.

Rust

test

test()

Add parentheses.

Kotlin

def test(a): return a + 1

Correct.

Python

var x = 23;

Correct.

Dart

String foo = 'info';

String foo = "info";

Double quotes.

Java

Add alt text.

HTML

for (index in data)

for (index of data)

for...in iterates keys.

JavaScript