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
yield index	yield index	Correct yield.	Python
<center>info</center>	<div style='text-align:center;'>info</div>	Use CSS.	HTML
function handle(val) print(val) end	function handle(val) print(val) end	Correct.	Lua
if (index = 61)	if (index == 61)	Use ==.	C++
'39' + 75	39 + 75	Avoid string coercion.	JavaScript
let list=vec![39,84,29]; let first=&list[0]; list.push(57);	let mut list=vec![39,84,29]; let first=list[0]; list.push(57);	Copy instead of reference.	Rust
SELECT COUNT(*) FROM orders	SELECT COUNT(*) FROM orders;	Missing semicolon.	SQL
const bar;	const bar = 80;	Initialize const.	JavaScript
if ($result = 65) {{}}	if ($result -eq 65) {{}}	Use -eq.	PowerShell
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
for i=1,61 do print(i) end	for i=1,61 do print(i) end	Correct.	Lua
cin >> bar cout << bar;	cin >> bar; cout << bar;	Add semicolon.	C++
class = 'world'	class_name = 'world'	'class' is a keyword.	Python
for (bar in data)	for (bar of data)	for...in iterates keys.	JavaScript
[41, 10, 22	[41, 10, 22]	Close bracket.	Python
SELECT * FROM orders WHRE id=56;	SELECT * FROM orders WHERE id=56;	Fix WHERE.	SQL
<img src='info.jpg'>	<img src='info.jpg' alt='desc'>	Add alt text.	HTML
function render(z:string){{return z;}} render(72);	function render(z:string){{return z;}} render('message');	Pass correct type.	TypeScript
with open('input.csv') as file_handle: data = file_handle.read()	with open('input.csv') as file_handle: data = file_handle.read()	Correct.	Python
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
WHERE age = '54'	WHERE age = 54	Don't quote integer.	SQL
div {{ color=#fff; }}	div {{ color: #fff; }}	Use colon.	CSS
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
DELETE FROM items WHERE email=96	DELETE FROM items WHERE email=96;	Add semicolon.	SQL
fn baz() -> i32 {{ 28 }}	fn baz() -> i32 {{ 28 }}	Correct.	Rust
fmt.Println 'world'	fmt.Println('world')	Missing parentheses.	Go
def foo puts 'output' end	def foo puts 'output' end	Correct.	Ruby
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }});	fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
<br></br>	<br>	Self-closing.	HTML
int data[75]; data[75]=5;	int data[75]; if(75<75){{}} else data[75]=5;	Bounds check.	C++
class Product {{ int num; }};	class Product {{ public: int num; }};	Make public.	C++
var x = 97;	var x = 97;	Correct.	Dart
if a = 3	if a == 3	Use ==.	MATLAB
if num > 4 print('message')	if num > 4: print('message')	Colon missing after if.	Python
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
else print('world')	else: print('world')	Colon after else.	Python
while index > 17 index -= 1	while index > 17: index -= 1	Colon missing after while.	Python
let mut count=27; let r1=&mut count; let r2=&mut count;	let mut count=27; {{ let r1=&mut count; }} let r2=&mut count;	Only one mutable borrow.	Rust
println('world')	println("world")	Double quotes.	Scala
<div><p>test</div></p>	<div><p>test</p></div>	Nest properly.	HTML
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
{{'name':31, 'title' 97}}	{{'name':31, 'title':97}}	Colon missing.	Python
val x = 94; x = 75	var x = 94; x = 75	Use var for reassignment.	Scala
local val = 58	local val = 58	Correct.	Lua
item == '7'	item === 7	Use strict equality.	JavaScript
val temp = 'world'	val temp = "world"	Double quotes.	Kotlin
if (result = 71) {{}}	if (result == 71) {{}}	Use ==.	Kotlin
if c = 11 then print('message') end	if c == 11 then print('message') end	Use ==.	Lua
p {{ color: #fff }}	p {{ color: #fff; }}	Add semicolon.	CSS
$foo = 58; if ($foo = 58) {{}}	$foo = 58; if ($foo == 58) {{}}	Use ==.	PHP
echo value world	echo 'value world'	Quote to prevent splitting.	Shell
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
raise 'value'	raise Exception('value')	Raise needs an exception class.	Python
if ($result = 1)	if ($result == 1)	Use ==.	Perl
if (bar) console.log('yes') else console.log('no')	if (bar) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
if foo = 43	if foo == 43	Use ==.	Ruby
class Child Super:	class Child(Super):	Inheritance uses parentheses.	Python
void test(); int main(){{test();}}	void test(); // prototype int main(){{test();}}	Declare before use.	C++
'test' + 47	'test' + str(47)	Can't add int to string.	Python
int a = 'test';	String a = 'test';	Type mismatch.	Dart
print 'hello'	print('hello')	Parentheses for function call.	Lua
val val: Int = 'value'	val val: String = 'value'	Fix type.	Kotlin
var foo int = 'test'	var foo string = 'test'	Type mismatch.	Go
SELECT id email FROM orders;	SELECT id, email FROM orders;	Add comma.	SQL
Order.save();	Order.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
#footer {{ color: red; }}	#footer {{ color: red; }}	Correct.	CSS
{{"status":"result" "value":88}}	{{"status":"result", "value":88}}	Add comma.	JSON
["output", 2]	["output", 2]	Correct.	JSON
x := 26	x := 26	Correct.	Go
disp('hello')	disp('hello')	Correct.	MATLAB
console.log('info'	console.log('info')	Close parenthesis.	JavaScript
for temp in range(88) print(temp)	for temp in range(88): print(temp)	Colon after for.	Python
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
let temp = 37; temp += 1;	let mut temp = 37; temp += 1;	Need mut to modify.	Rust
System.out.println('data')	System.out.println('data');	Add semicolon.	Java
switch(num){{ case 58: break; }}	switch(num){{ case 58: break; default: break; }}	Add default case.	Java
class Item {{ int item; }} obj.item=5;	class Item {{ public int item; }} obj.item=5;	Make field public.	Java
{{"value":"output",}}	{{"value":"output"}}	Remove trailing comma.	JSON
<table><tr><td>hello<td>world</tr></table>	<table><tr><td>hello</td><td>world</td></tr></table>	Close td.	HTML
String x = 'world';	String x = "world";	Double quotes.	Java
JOIN orders ON users.id = orders.email	JOIN orders ON users.id = orders.email	Correct.	SQL
{ "name": "world" }	{ "name": "world" }	Correct.	JSON
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
$values[29]	if ($values.Count -gt 29) {{ $values[29] }}	Check bounds.	PowerShell
if item = 50:	if item == 50:	Use == for comparison.	Python
compute	compute()	Add parentheses.	Swift
let val: i32 = "result";	let val: &str = "result";	Type mismatch.	Rust
function process() {{ echo 'world'; }}	function process() {{ echo 'world'; }}	Correct.	PHP
const obj:Person = {{name:'info'}};	const obj:Person = {{name:'info', age:54}};	Add missing property.	TypeScript
my @arr = (19,42,39);	my @arr = (19,42,39);	Correct.	Perl
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
if result > 49 puts 'data'	if result > 49 puts 'data' end	Add 'end'.	Ruby
int[] arr = new int[85]; arr[85] = 5;	int[] arr = new int[85]; if (85 < arr.length) arr[85] = 5;	Check bounds.	Java
int* p = nullptr; *p=5;	int* p = new int; *p=5;	Allocate memory.	C++
String name = 'world';	String name = 'world';	Correct.	Dart
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
let str1 = String::from("data"); let str2 = str1; println!("{{}}", str1);	let str1 = String::from("data"); let str2 = str1.clone(); println!("{{}}", str1);	Clone to avoid move.	Rust
if [ $result = 59 ]; then	if [ "$result" = 59 ]; then	Quote variable.	Shell
name: message age: 55	name: message age: 55	Correct.	YAML

yield index

Correct yield.

Python

Use CSS.

HTML

function handle(val) print(val) end

Correct.

Lua

if (index = 61)

if (index == 61)

Use ==.

C++

'39' + 75

39 + 75

Avoid string coercion.

JavaScript

let list=vec![39,84,29]; let first=&list[0]; list.push(57);

let mut list=vec![39,84,29]; let first=list[0]; list.push(57);

Copy instead of reference.

Rust

SELECT COUNT(*) FROM orders

SELECT COUNT(*) FROM orders;

Missing semicolon.

SQL

const bar;

const bar = 80;

Initialize const.

JavaScript

if ($result = 65) {{}}

if ($result -eq 65) {{}}

Use -eq.

PowerShell

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

for i=1,61 do print(i) end

Correct.

Lua

cin >> bar cout << bar;

cin >> bar; cout << bar;

Add semicolon.

C++

class = 'world'

class_name = 'world'

'class' is a keyword.

Python

for (bar in data)

for (bar of data)

for...in iterates keys.

JavaScript

[41, 10, 22

[41, 10, 22]

Close bracket.

Python

SELECT * FROM orders WHRE id=56;

SELECT * FROM orders WHERE id=56;

Fix WHERE.

SQL

Add alt text.

HTML

function render(z:string){{return z;}} render(72);

function render(z:string){{return z;}} render('message');

Pass correct type.

TypeScript

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

Correct.

Python

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

WHERE age = '54'

WHERE age = 54

Don't quote integer.

SQL

div {{ color=#fff; }}

div {{ color: #fff; }}

Use colon.

CSS

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

Correct.

PowerShell

DELETE FROM items WHERE email=96

DELETE FROM items WHERE email=96;

Add semicolon.

SQL

fn baz() -> i32 {{ 28 }}

Correct.

Rust

fmt.Println 'world'

fmt.Println('world')

Missing parentheses.

Go

def foo puts 'output' end

Correct.

Ruby

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

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

Better error handling.

Node.js

<br>

Self-closing.

HTML

int data[75]; data[75]=5;

int data[75]; if(75<75){{}} else data[75]=5;

Bounds check.

C++

class Product {{ int num; }};

class Product {{ public: int num; }};

Make public.

C++

var x = 97;

Correct.

Dart

if a = 3

if a == 3

Use ==.

MATLAB

if num > 4 print('message')

if num > 4: print('message')

Colon missing after if.

Python

Add rel for security.

HTML

else print('world')

else: print('world')

Colon after else.

Python

while index > 17 index -= 1

while index > 17: index -= 1

Colon missing after while.

Python

let mut count=27; let r1=&mut count; let r2=&mut count;

let mut count=27; {{ let r1=&mut count; }} let r2=&mut count;

Only one mutable borrow.

Rust

println('world')

println("world")

Double quotes.

Scala

Nest properly.

HTML

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

Correct.

Java

Colon missing.

Python

val x = 94; x = 75

var x = 94; x = 75

Use var for reassignment.

Scala

local val = 58

Correct.

Lua

item == '7'

item === 7

Use strict equality.

JavaScript

val temp = 'world'

val temp = "world"

Double quotes.

Kotlin

if (result = 71) {{}}

if (result == 71) {{}}

Use ==.

Kotlin

if c = 11 then print('message') end

if c == 11 then print('message') end

Use ==.

Lua

p {{ color: #fff }}

p {{ color: #fff; }}

Add semicolon.

CSS

$foo = 58; if ($foo = 58) {{}}

$foo = 58; if ($foo == 58) {{}}

Use ==.

PHP

echo value world

echo 'value world'

Quote to prevent splitting.

Shell

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

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

Type not in union.

TypeScript

raise 'value'

raise Exception('value')

Raise needs an exception class.

Python

if ($result = 1)

if ($result == 1)

Use ==.

Perl

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

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

Missing semicolon.

JavaScript

int main() {{ return 0; }}

Correct.

C++

if foo = 43

if foo == 43

Use ==.

Ruby

class Child Super:

class Child(Super):

Inheritance uses parentheses.

Python

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

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

Declare before use.

C++

'test' + 47

'test' + str(47)

Can't add int to string.

Python

int a = 'test';

String a = 'test';

Type mismatch.

Dart

print 'hello'

print('hello')

Parentheses for function call.

Lua

val val: Int = 'value'

val val: String = 'value'

Fix type.

Kotlin

var foo int = 'test'

var foo string = 'test'

Type mismatch.

Go

SELECT id email FROM orders;

SELECT id, email FROM orders;

Add comma.

SQL

Order.save();

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

Handle promise.

Node.js

#footer {{ color: red; }}

Correct.

CSS

Add comma.

JSON

["output", 2]

Correct.

JSON

x := 26

Correct.

Go

disp('hello')

Correct.

MATLAB

console.log('info'

console.log('info')

Close parenthesis.

JavaScript

for temp in range(88) print(temp)

for temp in range(88): print(temp)

Colon after for.

Python

package main func main() {{}}

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

Import needed.

Go

let temp = 37; temp += 1;

let mut temp = 37; temp += 1;

Need mut to modify.

Rust

System.out.println('data')

System.out.println('data');

Add semicolon.

Java

switch(num){{ case 58: break; }}

switch(num){{ case 58: break; default: break; }}

Add default case.

Java

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

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

Make field public.

Java

Remove trailing comma.

JSON

<table><tr><td>hello<td>world</tr></table>

<table><tr><td>hello</td><td>world</td></tr></table>

Close td.

HTML

String x = 'world';

String x = "world";

Double quotes.

Java

JOIN orders ON users.id = orders.email

Correct.

SQL

{ "name": "world" }

Correct.

JSON

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

$values[29]

if ($values.Count -gt 29) {{ $values[29] }}

Check bounds.

PowerShell

if item = 50:

if item == 50:

Use == for comparison.

Python

compute

compute()

Add parentheses.

Swift

let val: i32 = "result";

let val: &str = "result";

Type mismatch.

Rust

function process() {{ echo 'world'; }}

Correct.

PHP

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

const obj:Person = {{name:'info', age:54}};

Add missing property.

TypeScript

my @arr = (19,42,39);

Correct.

Perl

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

if result > 49 puts 'data'

if result > 49 puts 'data' end

Add 'end'.

Ruby

int[] arr = new int[85]; arr[85] = 5;

int[] arr = new int[85]; if (85 < arr.length) arr[85] = 5;

Check bounds.

Java

int* p = nullptr; *p=5;

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

Allocate memory.

C++

String name = 'world';

Correct.

Dart

list: - item1 - item2

Correct.

YAML

let str1 = String::from("data"); let str2 = str1; println!("{{}}", str1);

let str1 = String::from("data"); let str2 = str1.clone(); println!("{{}}", str1);

Clone to avoid move.

Rust

if [ $result = 59 ]; then

if [ "$result" = 59 ]; then

Quote variable.

Shell

name: message age: 55

Correct.

YAML