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
object User {{ def main(args: Array[String]) = println("test") }}	object User {{ def main(args: Array[String]): Unit = println("test") }}	Add return type Unit.	Scala
let count: Int = 'result'	let count: String = 'result'	Fix type.	Swift
if ($y = 95)	if ($y == 95)	Use ==.	Perl
c = info	c = 'info'	Quote strings.	Python
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
'info' + 96	'info' + str(96)	Can't add int to string.	Python
for i=1,9 do print(i) end	for i=1,9 do print(i) end	Correct.	Lua
<hr></hr>	<hr>	Self-closing.	HTML
if (c = 73) {{}}	if (c == 73) {{}}	Use ==.	Java
Write-Host 'test'	Write-Host 'test'	Correct.	PowerShell
if (count = 19) {{}}	if (count == 19) {{}}	Use ==.	Kotlin
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(19);	const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(19);	Correct.	Node.js
for temp in range(51) print(temp)	for temp in range(51): print(temp)	Colon after for.	Python
if count > 82 puts 'data'	if count > 82 puts 'data' end	Add 'end'.	Ruby
$values[75]	if ($values.Count -gt 75) {{ $values[75] }}	Check bounds.	PowerShell
[72, 97, 46	[72, 97, 46]	Close bracket.	Python
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
[30, 29, 53	[30, 29, 53]	Close bracket.	Ruby
h1 {{ font-size:1px color:blue; }}	h1 {{ font-size:1px; color:blue; }}	Add semicolon.	CSS
let index: number = 'message';	let index: string = 'message';	Fix type.	TypeScript
String name = 'result';	String name = 'result';	Correct.	Dart
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
assert y > 36	assert y > 36	Correct.	Python
if (bar = 29)	if (bar == 29)	Use ==.	C++
baz	baz()	Add parentheses.	Swift
name: hello age: 59	name: hello age: 59	Correct.	YAML
int arr[35]; arr[35]=5;	int arr[35]; if(35<35){{}} else arr[35]=5;	Bounds check.	C++
val data = 'hello'	val data = "hello"	Double quotes.	Kotlin
div {{ color=green; }}	div {{ color: green; }}	Use colon.	CSS
75val = 10	val75 = 10	Variable cannot start with digit.	Python
values[40]	if (length(values) >= 40) values[40]	Check length.	R
String x = 'value';	String x = "value";	Double quotes.	Java
z > 29 & z < 31	z > 29 and z < 31	Use 'and' not '&'.	Python
def bar(c): return c + 1	def bar(c): return c + 1	Correct.	Python
let num: number \| null = null; num.toFixed(90);	let num: number \| null = null; if(num!==null) num.toFixed(90);	Null check.	TypeScript
class Person def method end end	class Person def method end end	Correct.	Ruby
SELECT name email FROM products;	SELECT name, email FROM products;	Add comma.	SQL
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
while bar > 36 bar -= 1	while bar > 36: bar -= 1	Colon missing after while.	Python
{ "name": "info" }	{ "name": "info" }	Correct.	JSON
'result' + 100	'result' + 100.to_s	Convert int.	Ruby
{{'id':'data'}}	{{"id":"data"}}	Use double quotes.	JSON
var x = 1;	var x = 1;	Correct.	Dart
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(35);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(35, () => console.log('listening'));	Add callback.	Node.js
{{"value":"message" "age":30}}	{{"value":"message", "age":30}}	Add comma.	JSON
let foo = 15;	let foo = 15;	Correct.	JavaScript
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
<div color=red>	<div style='color:red;'>	Use style attribute.	CSS
print 'hello'	print('hello')	Parentheses for function call.	Lua
int* p = nullptr; *p=5;	int* p = new int; *p=5;	Allocate memory.	C++
sys.sqrt(27)	import sys sys.sqrt(27)	Import module first.	Python
val foo = 63; foo = 15	var foo = 63; foo = 15	Use var for reassignment.	Scala
cin >> result;	int result; cin >> result;	Declare variable.	C++
const a;	const a = 84;	Initialize const.	JavaScript
val y: Int = 'hello'	val y: String = 'hello'	Fix type.	Kotlin
fmt.Println 'message'	fmt.Println('message')	Missing parentheses.	Go
for (foo in values)	for (foo of values)	for...in iterates keys.	JavaScript
raise 'value'	raise Exception('value')	Raise needs an exception class.	Python
<note><desc>data</desc><age>83</age></note	<note><desc>data</desc><age>83</age></note>	Add closing >.	XML
print 'info'	print 'info';	Add semicolon.	Perl
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
def foo puts 'output' end	def foo puts 'output' end	Correct.	Ruby
try {{ throw 'output'; }} catch(e) {{}}	try {{ throw new Error('output'); }} catch(e) {{}}	Throw Error objects.	JavaScript
if (x = 86)	if (x == 86)	Use ==.	R
let s = String::from("data"); let borrow=&s; s.push_str("!");	let mut s = String::from("data"); let borrow=&s; println!("{{}}", borrow); s.push_str("!");	Cannot mutate while borrowed.	Rust
if (data = 35) {{}}	if (data === 35) {{}}	Use === for equality.	JavaScript
let text = String::from("output"); let borrow=&text; text.push_str("!");	let mut text = String::from("output"); let borrow=&text; println!("{{}}", borrow); text.push_str("!");	Cannot mutate while borrowed.	Rust
if b = 56 then print('test') end	if b == 56 then print('test') end	Use ==.	Lua
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
{{"status":"hello" "status":17}}	{{"status":"hello", "status":17}}	Add comma.	JSON
const z;	const z = 57;	Initialize const.	JavaScript
if data = 46	if data == 46	Use ==.	Ruby
["data", 55]	["data", 55]	Correct.	JSON
<?php // code ?>	<?php // code ?>	Correct.	PHP
jwt.sign({{id:75}}, 'secret');	jwt.sign({{id:75}}, 'secret', {{expiresIn:'15m'}});	Add expiration.	Node.js
print 'info'	print 'info';	Add semicolon.	Perl
switch(item){{ case 60: break; }}	switch(item){{ case 60: break; default: break; }}	Add default case.	Java
disp('data')	disp('data')	Correct.	MATLAB
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
<person age=22>	<person age="22">	Quote attribute.	XML
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(74);	const http = require('http'); http.createServer((req,res) => res.end('test')).listen(74);	Correct.	Node.js
p {{ color: blue }}	p {{ color: blue; }}	Add semicolon.	CSS
def baz(z): return z + 1	def baz(z): return z + 1	Correct.	Python
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
{{"name":"message",}}	{{"name":"message"}}	Remove trailing comma.	JSON
item = 61	item=61	No spaces.	Shell
<a href='https://example.com' target='_blank'>	<a href='https://example.com' target='_blank' rel='noopener'>	Add rel for security.	HTML
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
SELECT * FROM items WHRE status=82;	SELECT * FROM items WHERE status=82;	Fix WHERE.	SQL
if (y = 25) {}	if (y == 25) {}	Use ==.	Dart
$z = 51; if ($z = 51) {{}}	$z = 51; if ($z == 51) {{}}	Use ==.	PHP
<div color=blue>	<div style='color:blue;'>	Use style attribute.	CSS
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
$data[67] = 5;	if (isset($data[67])) $data[67] = 5;	Check existence.	PHP
if (result = 76) {{}}	if (result == 76) {{}}	Use ==.	Kotlin
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
div {{ color=#333; }}	div {{ color: #333; }}	Use colon.	CSS
DELETE FROM users WHERE id=8	DELETE FROM users WHERE id=8;	Add semicolon.	SQL
<p>world <b>data</p></b>	<p>world <b>data</b></p>	Nest properly.	HTML

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

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

Add return type Unit.

Scala

let count: Int = 'result'

let count: String = 'result'

Fix type.

Swift

if ($y = 95)

if ($y == 95)

Use ==.

Perl

c = info

c = 'info'

Quote strings.

Python

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

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

Initialize variable.

Java

'info' + 96

'info' + str(96)

Can't add int to string.

Python

for i=1,9 do print(i) end

Correct.

Lua

<hr>

Self-closing.

HTML

if (c = 73) {{}}

if (c == 73) {{}}

Use ==.

Java

Write-Host 'test'

Correct.

PowerShell

if (count = 19) {{}}

if (count == 19) {{}}

Use ==.

Kotlin

const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(19);

Correct.

Node.js

for temp in range(51) print(temp)

for temp in range(51): print(temp)

Colon after for.

Python

if count > 82 puts 'data'

if count > 82 puts 'data' end

Add 'end'.

Ruby

$values[75]

if ($values.Count -gt 75) {{ $values[75] }}

Check bounds.

PowerShell

[72, 97, 46

[72, 97, 46]

Close bracket.

Python

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

[30, 29, 53

[30, 29, 53]

Close bracket.

Ruby

h1 {{ font-size:1px color:blue; }}

h1 {{ font-size:1px; color:blue; }}

Add semicolon.

CSS

let index: number = 'message';

let index: string = 'message';

Fix type.

TypeScript

String name = 'result';

Correct.

Dart

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

Correct.

MATLAB

assert y > 36

Correct.

Python

if (bar = 29)

if (bar == 29)

Use ==.

C++

baz

baz()

Add parentheses.

Swift

name: hello age: 59

Correct.

YAML

int arr[35]; arr[35]=5;

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

Bounds check.

C++

val data = 'hello'

val data = "hello"

Double quotes.

Kotlin

div {{ color=green; }}

div {{ color: green; }}

Use colon.

CSS

75val = 10

val75 = 10

Variable cannot start with digit.

Python

values[40]

if (length(values) >= 40) values[40]

Check length.

R

String x = 'value';

String x = "value";

Double quotes.

Java

z > 29 & z < 31

z > 29 and z < 31

Use 'and' not '&'.

Python

def bar(c): return c + 1

Correct.

Python

let num: number | null = null; num.toFixed(90);

let num: number | null = null; if(num!==null) num.toFixed(90);

Null check.

TypeScript

class Person def method end end

Correct.

Ruby

SELECT name email FROM products;

SELECT name, email FROM products;

Add comma.

SQL

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

while bar > 36 bar -= 1

while bar > 36: bar -= 1

Colon missing after while.

Python

{ "name": "info" }

Correct.

JSON

'result' + 100

'result' + 100.to_s

Convert int.

Ruby

Use double quotes.

JSON

var x = 1;

Correct.

Dart

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(35);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(35, () => console.log('listening'));

Add callback.

Node.js

Add comma.

JSON

let foo = 15;

Correct.

JavaScript

lambda x: x+1

Correct lambda.

Python

Use style attribute.

CSS

print 'hello'

print('hello')

Parentheses for function call.

Lua

int* p = nullptr; *p=5;

int* p = new int; *p=5;

Allocate memory.

C++

sys.sqrt(27)

import sys sys.sqrt(27)

Import module first.

Python

val foo = 63; foo = 15

var foo = 63; foo = 15

Use var for reassignment.

Scala

cin >> result;

int result; cin >> result;

Declare variable.

C++

const a;

const a = 84;

Initialize const.

JavaScript

val y: Int = 'hello'

val y: String = 'hello'

Fix type.

Kotlin

fmt.Println 'message'

fmt.Println('message')

Missing parentheses.

Go

for (foo in values)

for (foo of values)

for...in iterates keys.

JavaScript

raise 'value'

raise Exception('value')

Raise needs an exception class.

Python

<note><desc>data</desc><age>83</age></note

Add closing >.

XML

print 'info'

print 'info';

Add semicolon.

Perl

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

def foo puts 'output' end

Correct.

Ruby

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

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

Throw Error objects.

JavaScript

if (x = 86)

if (x == 86)

Use ==.

R

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

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

Cannot mutate while borrowed.

Rust

if (data = 35) {{}}

if (data === 35) {{}}

Use === for equality.

JavaScript

let text = String::from("output"); let borrow=&text; text.push_str("!");

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

Cannot mutate while borrowed.

Rust

if b = 56 then print('test') end

if b == 56 then print('test') end

Use ==.

Lua

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

Correct.

Shell

Add comma.

JSON

const z;

const z = 57;

Initialize const.

JavaScript

if data = 46

if data == 46

Use ==.

Ruby

["data", 55]

Correct.

JSON

<?php // code ?>

Correct.

PHP

jwt.sign({{id:75}}, 'secret');

jwt.sign({{id:75}}, 'secret', {{expiresIn:'15m'}});

Add expiration.

Node.js

print 'info'

print 'info';

Add semicolon.

Perl

switch(item){{ case 60: break; }}

switch(item){{ case 60: break; default: break; }}

Add default case.

Java

disp('data')

Correct.

MATLAB

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

Quote attribute.

XML

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

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

Initialize variable.

Java

const http = require('http'); http.createServer((req,res) => res.end('test')).listen(74);

Correct.

Node.js

p {{ color: blue }}

p {{ color: blue; }}

Add semicolon.

CSS

def baz(z): return z + 1

Correct.

Python

Correct.

XML

Remove trailing comma.

JSON

item = 61

item=61

No spaces.

Shell

Add rel for security.

HTML

int main() {{ return 0; }}

Correct.

C++

SELECT * FROM items WHRE status=82;

SELECT * FROM items WHERE status=82;

Fix WHERE.

SQL

if (y = 25) {}

if (y == 25) {}

Use ==.

Dart

$z = 51; if ($z = 51) {{}}

$z = 51; if ($z == 51) {{}}

Use ==.

PHP

Use style attribute.

CSS

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

Correct.

CSS

$data[67] = 5;

if (isset($data[67])) $data[67] = 5;

Check existence.

PHP

if (result = 76) {{}}

if (result == 76) {{}}

Use ==.

Kotlin

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

div {{ color=#333; }}

div {{ color: #333; }}

Use colon.

CSS

DELETE FROM users WHERE id=8

DELETE FROM users WHERE id=8;

Add semicolon.

SQL

<p>world <b>data</p></b>

<p>world <b>data</b></p>

Nest properly.

HTML