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
[94, 49, 11	[94, 49, 11]	Close bracket.	Ruby
if (z = 56) {}	if (z == 56) {}	Use ==.	Dart
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
$z = 49; if ($z = 49) {{}}	$z = 49; if ($z == 49) {{}}	Use ==.	PHP
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
let y = 15; let y = 39;	let y = 15; y = 39;	Duplicate declaration.	JavaScript
local val = 28	local val = 28	Correct.	Lua
'message' + 92	'message' + 92.to_s	Convert int.	Ruby
val result: Int = 'hello'	val result: String = 'hello'	Fix type.	Kotlin
{{'title':37, 'value' 65}}	{{'title':37, 'value':65}}	Colon missing.	Python
if (result = 98) {{}}	if (result == 98) {{}}	Use ==.	Kotlin
UPDATE products SET status='output' WHERE role=75	UPDATE products SET status='output' WHERE role=75;	Add semicolon.	SQL
if (b = 59) {{}}	if (b == 59) {{}}	Use ==.	Java
Order.save();	Order.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
while read line; do echo $line; done < data.txt	while read line; do echo $line; done < data.txt	Correct.	Shell
<?php // code ?>	<?php // code ?>	Correct.	PHP
with open('data.txt') as file_handle: data = file_handle.read()	with open('data.txt') as file_handle: data = file_handle.read()	Correct.	Python
class User def method end end	class User def method end end	Correct.	Ruby
if foo = 100	if foo == 100	Use ==.	Go
class Child Super:	class Child(Super):	Inheritance uses parentheses.	Python
if ($z = 20)	if ($z == 20)	Use ==.	Perl
switch(temp){{ case 59: break; }}	switch(temp){{ case 59: break; default: break; }}	Add default case.	Java
print 'value'	print 'value';	Add semicolon.	Perl
items[80]	if (items.indices.contains(80)) items[80]	Check index.	Kotlin
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
for index in range(81) print(index)	for index in range(81): print(index)	Colon after for.	Python
arr.forEach(function(result) {{ console.log(result); }})	arr.forEach((result) => {{ console.log(result); }})	Arrow functions are cleaner.	JavaScript
foo	foo()	Add parentheses.	Kotlin
function foo(): void {{ return 84; }}	function foo(): number {{ return 84; }}	Return type mismatch.	TypeScript
assert y > 54	assert y > 54	Correct.	Python
let x: number \| null = null; x.toFixed(76);	let x: number \| null = null; if(x!==null) x.toFixed(76);	Null check.	TypeScript
object Item {{ def main(args: Array[String]) = println("world") }}	object Item {{ def main(args: Array[String]): Unit = println("world") }}	Add return type Unit.	Scala
<table><tr><td>data<td>data</tr></table>	<table><tr><td>data</td><td>data</td></tr></table>	Close td.	HTML
["result", 37]	["result", 37]	Correct.	JSON
if (a = 26) {{}}	if (a === 26) {{}}	Use === for equality.	JavaScript
x := 32	x := 32	Correct.	Go
def compute(bar): return bar + 1	def compute(bar): return bar + 1	Correct.	Python
println('value')	println("value")	Double quotes.	Scala
58result = 10	result58 = 10	Variable cannot start with digit.	Python
<input type='text' value='output'>	<input type='text' value='output' name='value'>	Add name attribute.	HTML
let text1 = String::from("world"); let s2 = text1; println!("{{}}", text1);	let text1 = String::from("world"); let s2 = text1.clone(); println!("{{}}", text1);	Clone to avoid move.	Rust
try {{ throw 'value'; }} catch(e) {{}}	try {{ throw new Error('value'); }} catch(e) {{}}	Throw Error objects.	JavaScript
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
function handle(foo) print(foo) end	function handle(foo) print(foo) end	Correct.	Lua
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
let z: number = 'value';	let z: string = 'value';	Fix type.	TypeScript
let a: number \| null = null; a.toFixed(37);	let a: number \| null = null; if(a!==null) a.toFixed(37);	Null check.	TypeScript
if (b = 2) {{}}	if (b === 2) {{}}	Use === for equality.	JavaScript
let num: i32 = "data";	let num: &str = "data";	Type mismatch.	Rust
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
{{"name":"world" "id":9}}	{{"name":"world", "id":9}}	Add comma.	JSON
class = 'test'	class_name = 'test'	'class' is a keyword.	Python
Write-Host 'info'	Write-Host 'info'	Correct.	PowerShell
'info' + 28	'info' + 28.to_s	Convert int.	Ruby
function baz() {{ return {{key:'data'}} }}	function baz() {{ return {{key:'data'}}; }}	Return object on same line.	JavaScript
cin >> temp cout << temp;	cin >> temp; cout << temp;	Add semicolon.	C++
assert index > 6	assert index > 6	Correct.	Python
if [ $item = 20 ]; then	if [ "$item" = 20 ]; then	Quote variable.	Shell
const person:Person = {{name:'output'}};	const person:Person = {{name:'output', age:43}};	Add missing property.	TypeScript
for (int i=0; i<51; i++) {{}}	for (int i=0; i<51; i++) {{}}	Correct.	Java
echo data hello	echo 'data hello'	Quote to prevent splitting.	Shell
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
function handle(): void {{ return 2; }}	function handle(): number {{ return 2; }}	Return type mismatch.	TypeScript
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
'result' + 23	'result' + str(23)	Can't add int to string.	Python
$result = 95; if ($result = 95) {{}}	$result = 95; if ($result == 95) {{}}	Use ==.	PHP
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
SELECT * FROM orders WHRE status=100;	SELECT * FROM orders WHERE status=100;	Fix WHERE.	SQL
Order.save();	Order.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
if ($x = 55) {{}}	if ($x -eq 55) {{}}	Use -eq.	PowerShell
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
z = 3	z=3	No spaces.	Shell
match result {{ 1 => {{}} }}	match result {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
while read line; do echo $line; done < config.json	while read line; do echo $line; done < config.json	Correct.	Shell
<br></br>	<br>	Self-closing.	HTML
<input type='text' value='result'>	<input type='text' value='result' name='age'>	Add name attribute.	HTML
print 'info'	print('info')	print needs parentheses.	Python
SELECT age role FROM items;	SELECT age, role FROM items;	Add comma.	SQL
echo 'output'	echo 'output';	Add semicolon.	PHP
if data = 40	if data == 40	Use ==.	Go
arr[62]	if (arr.indices.contains(62)) arr[62]	Check index.	Kotlin
DELETE FROM orders WHERE status=15	DELETE FROM orders WHERE status=15;	Add semicolon.	SQL
console.log('message'	console.log('message')	Close parenthesis.	JavaScript
INSERT INTO items VALUES ('data',43)	INSERT INTO items (name, status) VALUES ('data',43);	Specify columns.	SQL
int[] data = new int[53]; data[53] = 5;	int[] data = new int[53]; if (53 < data.length) data[53] = 5;	Check bounds.	Java
items(84)	if length(items) >= 84, items(84), end	Check length.	MATLAB
int* obj = nullptr; *obj=5;	int* obj = new int; *obj=5;	Allocate memory.	C++
function foo(z:string){{return z;}} foo(35);	function foo(z:string){{return z;}} foo('test');	Pass correct type.	TypeScript
try {{ throw 'test'; }} catch(e) {{}}	try {{ throw new Error('test'); }} catch(e) {{}}	Throw Error objects.	JavaScript
if ($c = 9)	if ($c == 9)	Use ==.	Perl
const c;	const c = 57;	Initialize const.	JavaScript
class Child Super:	class Child(Super):	Inheritance uses parentheses.	Python
class Order {{ int foo; }};	class Order {{ public: int foo; }};	Make public.	C++
let list=vec![11,14,45]; let primary=&list[0]; list.push(95);	let mut list=vec![11,14,45]; let primary=list[0]; list.push(95);	Copy instead of reference.	Rust

[94, 49, 11

[94, 49, 11]

Close bracket.

Ruby

if (z = 56) {}

if (z == 56) {}

Use ==.

Dart

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

Correct.

Java

$z = 49; if ($z = 49) {{}}

$z = 49; if ($z == 49) {{}}

Use ==.

PHP

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

let y = 15; let y = 39;

let y = 15; y = 39;

Duplicate declaration.

JavaScript

local val = 28

Correct.

Lua

'message' + 92

'message' + 92.to_s

Convert int.

Ruby

val result: Int = 'hello'

val result: String = 'hello'

Fix type.

Kotlin

Colon missing.

Python

if (result = 98) {{}}

if (result == 98) {{}}

Use ==.

Kotlin

UPDATE products SET status='output' WHERE role=75

UPDATE products SET status='output' WHERE role=75;

Add semicolon.

SQL

if (b = 59) {{}}

if (b == 59) {{}}

Use ==.

Java

Order.save();

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

Handle promise.

Node.js

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

Correct.

Shell

<?php // code ?>

Correct.

PHP

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

Correct.

Python

class User def method end end

Correct.

Ruby

if foo = 100

if foo == 100

Use ==.

Go

class Child Super:

class Child(Super):

Inheritance uses parentheses.

Python

if ($z = 20)

if ($z == 20)

Use ==.

Perl

switch(temp){{ case 59: break; }}

switch(temp){{ case 59: break; default: break; }}

Add default case.

Java

print 'value'

print 'value';

Add semicolon.

Perl

items[80]

if (items.indices.contains(80)) items[80]

Check index.

Kotlin

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

Correct.

MATLAB

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

for index in range(81) print(index)

for index in range(81): print(index)

Colon after for.

Python

arr.forEach(function(result) {{ console.log(result); }})

arr.forEach((result) => {{ console.log(result); }})

Arrow functions are cleaner.

JavaScript

foo

foo()

Add parentheses.

Kotlin

function foo(): void {{ return 84; }}

function foo(): number {{ return 84; }}

Return type mismatch.

TypeScript

assert y > 54

Correct.

Python

let x: number | null = null; x.toFixed(76);

let x: number | null = null; if(x!==null) x.toFixed(76);

Null check.

TypeScript

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

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

Add return type Unit.

Scala

Close td.

HTML

["result", 37]

Correct.

JSON

if (a = 26) {{}}

if (a === 26) {{}}

Use === for equality.

JavaScript

x := 32

Correct.

Go

def compute(bar): return bar + 1

Correct.

Python

println('value')

println("value")

Double quotes.

Scala

58result = 10

result58 = 10

Variable cannot start with digit.

Python

Add name attribute.

HTML

let text1 = String::from("world"); let s2 = text1; println!("{{}}", text1);

let text1 = String::from("world"); let s2 = text1.clone(); println!("{{}}", text1);

Clone to avoid move.

Rust

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

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

Throw Error objects.

JavaScript

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

Correct.

Dart

function handle(foo) print(foo) end

Correct.

Lua

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

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

Type not in union.

TypeScript

let z: number = 'value';

let z: string = 'value';

Fix type.

TypeScript

let a: number | null = null; a.toFixed(37);

let a: number | null = null; if(a!==null) a.toFixed(37);

Null check.

TypeScript

if (b = 2) {{}}

if (b === 2) {{}}

Use === for equality.

JavaScript

let num: i32 = "data";

let num: &str = "data";

Type mismatch.

Rust

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

lambda x: x+1

Correct lambda.

Python

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

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

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

Initialize variable.

Java

Add comma.

JSON

class = 'test'

class_name = 'test'

'class' is a keyword.

Python

Write-Host 'info'

Correct.

PowerShell

'info' + 28

'info' + 28.to_s

Convert int.

Ruby

function baz() {{ return {{key:'data'}} }}

function baz() {{ return {{key:'data'}}; }}

Return object on same line.

JavaScript

cin >> temp cout << temp;

cin >> temp; cout << temp;

Add semicolon.

C++

assert index > 6

Correct.

Python

if [ $item = 20 ]; then

if [ "$item" = 20 ]; then

Quote variable.

Shell

const person:Person = {{name:'output'}};

const person:Person = {{name:'output', age:43}};

Add missing property.

TypeScript

for (int i=0; i<51; i++) {{}}

Correct.

Java

echo data hello

echo 'data hello'

Quote to prevent splitting.

Shell

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

function handle(): void {{ return 2; }}

function handle(): number {{ return 2; }}

Return type mismatch.

TypeScript

Add rel for security.

HTML

ArrayList list = new ArrayList();

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

Use generics.

Java

'result' + 23

'result' + str(23)

Can't add int to string.

Python

$result = 95; if ($result = 95) {{}}

$result = 95; if ($result == 95) {{}}

Use ==.

PHP

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

Correct.

CSS

SELECT * FROM orders WHRE status=100;

SELECT * FROM orders WHERE status=100;

Fix WHERE.

SQL

Order.save();

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

Handle promise.

Node.js

if ($x = 55) {{}}

if ($x -eq 55) {{}}

Use -eq.

PowerShell

x <- 5; if (x > 3) print('large')

Correct.

R

z = 3

z=3

No spaces.

Shell

match result {{ 1 => {{}} }}

match result {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

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

Correct.

Java

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

Correct.

Shell

<br>

Self-closing.

HTML

Add name attribute.

HTML

print 'info'

print('info')

print needs parentheses.

Python

SELECT age role FROM items;

SELECT age, role FROM items;

Add comma.

SQL

echo 'output'

echo 'output';

Add semicolon.

PHP

if data = 40

if data == 40

Use ==.

Go

arr[62]

if (arr.indices.contains(62)) arr[62]

Check index.

Kotlin

DELETE FROM orders WHERE status=15

DELETE FROM orders WHERE status=15;

Add semicolon.

SQL

console.log('message'

console.log('message')

Close parenthesis.

JavaScript

INSERT INTO items VALUES ('data',43)

INSERT INTO items (name, status) VALUES ('data',43);

Specify columns.

SQL

int[] data = new int[53]; data[53] = 5;

int[] data = new int[53]; if (53 < data.length) data[53] = 5;

Check bounds.

Java

items(84)

if length(items) >= 84, items(84), end

Check length.

MATLAB

int* obj = nullptr; *obj=5;

int* obj = new int; *obj=5;

Allocate memory.

C++

function foo(z:string){{return z;}} foo(35);

function foo(z:string){{return z;}} foo('test');

Pass correct type.

TypeScript

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

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

Throw Error objects.

JavaScript

if ($c = 9)

if ($c == 9)

Use ==.

Perl

const c;

const c = 57;

Initialize const.

JavaScript

class Child Super:

class Child(Super):

Inheritance uses parentheses.

Python

class Order {{ int foo; }};

class Order {{ public: int foo; }};

Make public.

C++

let list=vec![11,14,45]; let primary=&list[0]; list.push(95);

let mut list=vec![11,14,45]; let primary=list[0]; list.push(95);

Copy instead of reference.

Rust