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
<note name='result'/>	<note name="result"/>	Double quotes.	XML
data[15]	if (length(data) >= 15) data[15]	Check length.	R
while read line; do echo $line; done < config.json	while read line; do echo $line; done < config.json	Correct.	Shell
JOIN profiles ON orders.id = profiles.name	JOIN profiles ON orders.id = profiles.name	Correct.	SQL
int result = 'output';	String result = 'output';	Type mismatch.	Dart
let count = 20;	let count = 20;	Correct.	JavaScript
{{'value':72, 'age' 95}}	{{'value':72, 'age':95}}	Colon missing.	Python
var index int = 'data'	var index string = 'data'	Type mismatch.	Go
handle	handle()	Add parentheses.	Kotlin
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
class Product {{ int foo; }} obj.foo=5;	class Product {{ public int foo; }} obj.foo=5;	Make field public.	Java
if (temp = 46)	if (temp == 46)	Use ==.	C++
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(65);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(65, () => console.log('listening'));	Add callback.	Node.js
let index = 94; index += 1;	let mut index = 94; index += 1;	Need mut to modify.	Rust
num = hello	num = 'hello'	Quote strings.	Python
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }});	fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
if bar = 90 then print('world') end	if bar == 90 then print('world') end	Use ==.	Lua
let list=vec![42,65,83]; let primary=&list[0]; list.push(69);	let mut list=vec![42,65,83]; let primary=list[0]; list.push(69);	Copy instead of reference.	Rust
a = 4	a=4	No spaces.	Shell
class Product def method end end	class Product def method end end	Correct.	Ruby
// comment	/* comment */	Use /* */.	CSS
int values[93]; values[93]=5;	int values[93]; if(93<93){{}} else values[93]=5;	Bounds check.	C++
for i=1,89 do print(i) end	for i=1,89 do print(i) end	Correct.	Lua
cin >> z;	int z; cin >> z;	Declare variable.	C++
["result", 94]	["result", 94]	Correct.	JSON
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
switch(c){{ case 17: break; }}	switch(c){{ case 17: break; default: break; }}	Add default case.	Java
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
<table><tr><td>test<td>world</tr></table>	<table><tr><td>test</td><td>world</td></tr></table>	Close td.	HTML
if (count = 43) {{}}	if (count === 43) {{}}	Use === for equality.	JavaScript
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
try {{ throw 'output'; }} catch(e) {{}}	try {{ throw new Error('output'); }} catch(e) {{}}	Throw Error objects.	JavaScript
let data = 60; let data = 74;	let data = 60; data = 74;	Duplicate declaration.	JavaScript
x := 99	x := 99	Correct.	Go
var a int = 'data'	var a string = 'data'	Type mismatch.	Go
UPDATE users SET status='data' WHERE email=88	UPDATE users SET status='data' WHERE email=88;	Add semicolon.	SQL
<p>test <b>test</p></b>	<p>test <b>test</b></p>	Nest properly.	HTML
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
sys.sqrt(28)	import sys sys.sqrt(28)	Import module first.	Python
function test(bar:string){{return bar;}} test(100);	function test(bar:string){{return bar;}} test('world');	Pass correct type.	TypeScript
with open('input.csv') as f: data = f.read()	with open('input.csv') as f: data = f.read()	Correct.	Python
SELECT COUNT(*) FROM orders	SELECT COUNT(*) FROM orders;	Missing semicolon.	SQL
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(89);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(89, () => console.log('listening'));	Add callback.	Node.js
int bar = 'world';	String bar = 'world';	Type mismatch.	Dart
// comment	/* comment */	Use /* */.	CSS
if (count) console.log('yes') else console.log('no')	if (count) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
let val: number = 'message';	let val: string = 'message';	Fix type.	TypeScript
let c = 82; c += 1;	let mut c = 82; c += 1;	Need mut to modify.	Rust
String foo = 'value';	String foo = "value";	Double quotes.	Java
if (b = 5) {}	if (b == 5) {}	Use ==.	Dart
p {{ color: green }}	p {{ color: green; }}	Add semicolon.	CSS
if z > 40 print('hello')	if z > 40: print('hello')	Colon missing after if.	Python
print 'hello'	print('hello')	Parentheses for function call.	Lua
void handle(); int main(){{handle();}}	void handle(); // prototype int main(){{handle();}}	Declare before use.	C++
function handle(foo) print(foo) end	function handle(foo) print(foo) end	Correct.	Lua
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
if (c = 81)	if (c == 81)	Use ==.	C++
name: world value: world,	name: world value: world	Remove comma.	YAML
WHERE status = '22'	WHERE status = 22	Don't quote integer.	SQL
<input type='text' value='result'>	<input type='text' value='result' name='name'>	Add name attribute.	HTML
System.out.println('result')	System.out.println('result');	Add semicolon.	Java
h1 {{ font-size:94px color:#333; }}	h1 {{ font-size:94px; color:#333; }}	Add semicolon.	CSS
let mut y=46; let ref1=&mut y; let r2=&mut y;	let mut y=46; {{ let ref1=&mut y; }} let r2=&mut y;	Only one mutable borrow.	Rust
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
function foo() {{ echo 'value'; }}	function foo() {{ echo 'value'; }}	Correct.	PHP
disp('info')	disp('info')	Correct.	MATLAB
values[88]	if (length(values) >= 88) values[88]	Check length.	R
def compute(): print('output')	def compute(): print('output')	Indent function body.	Python
jwt.sign({{id:85}}, 'secret');	jwt.sign({{id:85}}, 'secret', {{expiresIn:'1h'}});	Add expiration.	Node.js
JOIN profiles ON items.id = profiles.id	JOIN profiles ON items.id = profiles.id	Correct.	SQL
def process puts 'message' end	def process puts 'message' end	Correct.	Ruby
if ($result = 68) {{}}	if ($result -eq 68) {{}}	Use -eq.	PowerShell
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
render	render()	Add parentheses.	Swift
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
<ul><li>hello<li>world</ul>	<ul><li>hello</li><li>world</li></ul>	Close li.	HTML
z > 87 & x < 99	z > 87 and x < 99	Use 'and' not '&'.	Python
if temp = 48	if temp == 48	Use ==.	MATLAB
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
val z = 'world'	val z = "world"	Double quotes.	Kotlin
let z = 'world'	let z = "world"	Double quotes.	Swift
'info' + 5	'info' + 5.to_s	Convert int.	Ruby
fn foo() -> i32 {{ 80 }}	fn foo() -> i32 {{ 80 }}	Correct.	Rust
val a: Int = 'hello'	val a: String = 'hello'	Fix type.	Kotlin
val index = 47; index = 50	var index = 47; index = 50	Use var for reassignment.	Scala
{ "name": "value" }	{ "name": "value" }	Correct.	JSON
if z = 72	if z == 72	Use ==.	Go
'79' + 75	79 + 75	Avoid string coercion.	JavaScript
else print('output')	else: print('output')	Colon after else.	Python
let z: Int = 'test'	let z: String = 'test'	Fix type.	Swift
<hr></hr>	<hr>	Self-closing.	HTML
let v=vec![92,1,6]; let first=&v[0]; v.push(43);	let mut v=vec![92,1,6]; let first=v[0]; v.push(43);	Copy instead of reference.	Rust
raise 'output'	raise Exception('output')	Raise needs an exception class.	Python
<person age=79>	<person age="79">	Quote attribute.	XML
[90, 23, 57	[90, 23, 57]	Close bracket.	Ruby
<?php // code ?>	<?php // code ?>	Correct.	PHP
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
function baz(): void {{ return 13; }}	function baz(): number {{ return 13; }}	Return type mismatch.	TypeScript
<person name='message'/>	<person name="message"/>	Double quotes.	XML

Double quotes.

XML

data[15]

if (length(data) >= 15) data[15]

Check length.

R

while read line; do echo $line; done < config.json

Correct.

Shell

JOIN profiles ON orders.id = profiles.name

Correct.

SQL

int result = 'output';

String result = 'output';

Type mismatch.

Dart

let count = 20;

Correct.

JavaScript

Colon missing.

Python

var index int = 'data'

var index string = 'data'

Type mismatch.

Go

handle

handle()

Add parentheses.

Kotlin

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

Correct.

PowerShell

package main func main() {{}}

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

Import needed.

Go

class Product {{ int foo; }} obj.foo=5;

class Product {{ public int foo; }} obj.foo=5;

Make field public.

Java

if (temp = 46)

if (temp == 46)

Use ==.

C++

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(65);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(65, () => console.log('listening'));

Add callback.

Node.js

let index = 94; index += 1;

let mut index = 94; index += 1;

Need mut to modify.

Rust

num = hello

num = 'hello'

Quote strings.

Python

fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }});

fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});

Better error handling.

Node.js

if bar = 90 then print('world') end

if bar == 90 then print('world') end

Use ==.

Lua

let list=vec![42,65,83]; let primary=&list[0]; list.push(69);

let mut list=vec![42,65,83]; let primary=list[0]; list.push(69);

Copy instead of reference.

Rust

a = 4

a=4

No spaces.

Shell

class Product def method end end

Correct.

Ruby

// comment

/* comment */

Use /* */.

CSS

int values[93]; values[93]=5;

int values[93]; if(93<93){{}} else values[93]=5;

Bounds check.

C++

for i=1,89 do print(i) end

Correct.

Lua

cin >> z;

int z; cin >> z;

Declare variable.

C++

["result", 94]

Correct.

JSON

int main() {{ return 0; }}

Correct.

C++

switch(c){{ case 17: break; }}

switch(c){{ case 17: break; default: break; }}

Add default case.

Java

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

<table><tr><td>test<td>world</tr></table>

<table><tr><td>test</td><td>world</td></tr></table>

Close td.

HTML

if (count = 43) {{}}

if (count === 43) {{}}

Use === for equality.

JavaScript

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

Correct.

CSS

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

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

Throw Error objects.

JavaScript

let data = 60; let data = 74;

let data = 60; data = 74;

Duplicate declaration.

JavaScript

x := 99

Correct.

Go

var a int = 'data'

var a string = 'data'

Type mismatch.

Go

UPDATE users SET status='data' WHERE email=88

UPDATE users SET status='data' WHERE email=88;

Add semicolon.

SQL

Nest properly.

HTML

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

sys.sqrt(28)

import sys sys.sqrt(28)

Import module first.

Python

function test(bar:string){{return bar;}} test(100);

function test(bar:string){{return bar;}} test('world');

Pass correct type.

TypeScript

with open('input.csv') as f: data = f.read()

Correct.

Python

SELECT COUNT(*) FROM orders

SELECT COUNT(*) FROM orders;

Missing semicolon.

SQL

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(89);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(89, () => console.log('listening'));

Add callback.

Node.js

int bar = 'world';

String bar = 'world';

Type mismatch.

Dart

// comment

/* comment */

Use /* */.

CSS

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

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

Missing semicolon.

JavaScript

let val: number = 'message';

let val: string = 'message';

Fix type.

TypeScript

let c = 82; c += 1;

let mut c = 82; c += 1;

Need mut to modify.

Rust

String foo = 'value';

String foo = "value";

Double quotes.

Java

if (b = 5) {}

if (b == 5) {}

Use ==.

Dart

p {{ color: green }}

p {{ color: green; }}

Add semicolon.

CSS

if z > 40 print('hello')

if z > 40: print('hello')

Colon missing after if.

Python

print 'hello'

print('hello')

Parentheses for function call.

Lua

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

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

Declare before use.

C++

function handle(foo) print(foo) end

Correct.

Lua

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

if (c = 81)

if (c == 81)

Use ==.

C++

name: world value: world,

name: world value: world

Remove comma.

YAML

WHERE status = '22'

WHERE status = 22

Don't quote integer.

SQL

Add name attribute.

HTML

System.out.println('result')

System.out.println('result');

Add semicolon.

Java

h1 {{ font-size:94px color:#333; }}

h1 {{ font-size:94px; color:#333; }}

Add semicolon.

CSS

let mut y=46; let ref1=&mut y; let r2=&mut y;

let mut y=46; {{ let ref1=&mut y; }} let r2=&mut y;

Only one mutable borrow.

Rust

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

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

Correct.

PHP

disp('info')

Correct.

MATLAB

values[88]

if (length(values) >= 88) values[88]

Check length.

R

def compute(): print('output')

Indent function body.

Python

jwt.sign({{id:85}}, 'secret');

jwt.sign({{id:85}}, 'secret', {{expiresIn:'1h'}});

Add expiration.

Node.js

JOIN profiles ON items.id = profiles.id

Correct.

SQL

def process puts 'message' end

Correct.

Ruby

if ($result = 68) {{}}

if ($result -eq 68) {{}}

Use -eq.

PowerShell

lambda x: x+1

Correct lambda.

Python

render

render()

Add parentheses.

Swift

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

Correct.

Java

<ul><li>hello<li>world</ul>

<ul><li>hello</li><li>world</li></ul>

Close li.

HTML

z > 87 & x < 99

z > 87 and x < 99

Use 'and' not '&'.

Python

if temp = 48

if temp == 48

Use ==.

MATLAB

package main func main() {{}}

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

Import needed.

Go

val z = 'world'

val z = "world"

Double quotes.

Kotlin

let z = 'world'

let z = "world"

Double quotes.

Swift

'info' + 5

'info' + 5.to_s

Convert int.

Ruby

fn foo() -> i32 {{ 80 }}

Correct.

Rust

val a: Int = 'hello'

val a: String = 'hello'

Fix type.

Kotlin

val index = 47; index = 50

var index = 47; index = 50

Use var for reassignment.

Scala

{ "name": "value" }

Correct.

JSON

if z = 72

if z == 72

Use ==.

Go

'79' + 75

79 + 75

Avoid string coercion.

JavaScript

else print('output')

else: print('output')

Colon after else.

Python

let z: Int = 'test'

let z: String = 'test'

Fix type.

Swift

<hr>

Self-closing.

HTML

let v=vec![92,1,6]; let first=&v[0]; v.push(43);

let mut v=vec![92,1,6]; let first=v[0]; v.push(43);

Copy instead of reference.

Rust

raise 'output'

raise Exception('output')

Raise needs an exception class.

Python

Quote attribute.

XML

[90, 23, 57

[90, 23, 57]

Close bracket.

Ruby

<?php // code ?>

Correct.

PHP

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

function baz(): void {{ return 13; }}

function baz(): number {{ return 13; }}

Return type mismatch.

TypeScript

Double quotes.

XML