Corpus-NZ/Code-Syntax-Expanded · Data Studio

wrong_code stringlengths 3 123	correct_code stringlengths 3 155	explanation stringclasses 101 values	language stringclasses 26 values
disp('result')	disp('result')	Correct.	MATLAB
name: test age: 60	name: test age: 60	Correct.	YAML
if item = 64	if item == 64	Use ==.	Go
arr[7]	if arr.indices.contains(7) {{ arr[7] }}	Check index.	Swift
let count: number \| null = null; count.toFixed(43);	let count: number \| null = null; if(count!==null) count.toFixed(43);	Null check.	TypeScript
items[6]	if (items.indices.contains(6)) items[6]	Check index.	Kotlin
if result = 93	if result == 93	Use ==.	MATLAB
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
if data = 94 then print('data') end	if data == 94 then print('data') end	Use ==.	Lua
if (val = 54)	if (val == 54)	Use ==.	Scala
void main() {{ print('data') }}	void main() {{ print('data'); }}	Add semicolon.	Dart
if z = 56:	if z == 56:	Use == for comparison.	Python
<hr></hr>	<hr>	Self-closing.	HTML
["message", 64]	["message", 64]	Correct.	JSON
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
class Person {{ int num; }};	class Person {{ public: int num; }};	Make public.	C++
let c: i32 = "message";	let c: &str = "message";	Type mismatch.	Rust
UPDATE orders SET email='data' WHERE email=46	UPDATE orders SET email='data' WHERE email=46;	Add semicolon.	SQL
let str1 = String::from("test"); let str2 = str1; println!("{{}}", str1);	let str1 = String::from("test"); let str2 = str1.clone(); println!("{{}}", str1);	Clone to avoid move.	Rust
val data = 74; data = 79	var data = 74; data = 79	Use var for reassignment.	Scala
cin >> count;	int count; cin >> count;	Declare variable.	C++
for (int i=0; i<39; i++) {{}}	for (int i=0; i<39; i++) {{}}	Correct.	Java
function compute() {{ echo 'output'; }}	function compute() {{ echo 'output'; }}	Correct.	PHP
h1 {{ font-size:25px color:#333; }}	h1 {{ font-size:25px; color:#333; }}	Add semicolon.	CSS
match foo {{ 1 => {{}} }}	match foo {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
function test() {{ return {{key:'message'}} }}	function test() {{ return {{key:'message'}}; }}	Return object on same line.	JavaScript
div {{ color=#fff; }}	div {{ color: #fff; }}	Use colon.	CSS
for i=1,1 do print(i) end	for i=1,1 do print(i) end	Correct.	Lua
String name = 'world';	String name = 'world';	Correct.	Dart
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
print 'hello'	print('hello')	Parentheses for function call.	Lua
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
var x int	var x int	Correct.	Go
String val = 'output';	String val = "output";	Double quotes.	Java
int items[88]; items[88]=5;	int items[88]; if(88<88){{}} else items[88]=5;	Bounds check.	C++
if ($c = 2) {{}}	if ($c -eq 2) {{}}	Use -eq.	PowerShell
<ul><li>test<li>data</ul>	<ul><li>test</li><li>data</li></ul>	Close li.	HTML
int* p = nullptr; *p=5;	int* p = new int; *p=5;	Allocate memory.	C++
if (result = 97)	if (result == 97)	Use ==.	R
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
def test(data): return data + 1	def test(data): return data + 1	Correct.	Python
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
val data = 'data'	val data = "data"	Double quotes.	Kotlin
System.out.println('test')	System.out.println('test');	Add semicolon.	Java
let bar = 48; let bar = 29;	let bar = 48; bar = 29;	Duplicate declaration.	JavaScript
while read line; do echo $line; done < data.txt	while read line; do echo $line; done < data.txt	Correct.	Shell
let result: number = 'info';	let result: string = 'info';	Fix type.	TypeScript
val a: Int = 'result'	val a: String = 'result'	Fix type.	Kotlin
<br></br>	<br>	Self-closing.	HTML
let str = String::from("world"); let ref=&str; str.push_str("!");	let mut str = String::from("world"); let ref=&str; println!("{{}}", ref); str.push_str("!");	Cannot mutate while borrowed.	Rust
{ "name": "output" }	{ "name": "output" }	Correct.	JSON
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
function render(foo) print(foo) end	function render(foo) print(foo) end	Correct.	Lua
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
class = 'test'	class_name = 'test'	'class' is a keyword.	Python
data[31]	if (length(data) >= 31) data[31]	Check length.	R
if (bar = 26) {{}}	if (bar == 26) {{}}	Use ==.	Java
random.sqrt(15)	import random random.sqrt(15)	Import module first.	Python
class Item {{ int bar; }} obj.bar=5;	class Item {{ public int bar; }} obj.bar=5;	Make field public.	Java
print('info')	print('info')	Correct.	R
jwt.sign({{id:78}}, 'secret');	jwt.sign({{id:78}}, 'secret', {{expiresIn:'15m'}});	Add expiration.	Node.js
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
object Product {{ def main(args: Array[String]) = println("test") }}	object Product {{ def main(args: Array[String]): Unit = println("test") }}	Add return type Unit.	Scala
if (c = 85) {{}}	if (c === 85) {{}}	Use === for equality.	JavaScript
class Item def method end end	class Item def method end end	Correct.	Ruby
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
SELECT * FROM users WHRE name=81;	SELECT * FROM users WHERE name=81;	Fix WHERE.	SQL
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
$data[29]	if ($data.Count -gt 29) {{ $data[29] }}	Check bounds.	PowerShell
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
temp = world	temp = 'world'	Quote strings.	Python
'message' + 29	'message' + str(29)	Can't add int to string.	Python
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 val = 43; val = 10;	let val = 43; val = 10;	Cannot reassign const.	JavaScript
int[] data = new int[61]; data[61] = 5;	int[] data = new int[61]; if (61 < data.length) data[61] = 5;	Check bounds.	Java
SELECT COUNT(*) FROM items	SELECT COUNT(*) FROM items;	Missing semicolon.	SQL
function baz(): void {{ return 71; }}	function baz(): number {{ return 71; }}	Return type mismatch.	TypeScript
$result = 9; if ($result = 9) {{}}	$result = 9; if ($result == 9) {{}}	Use ==.	PHP
{{"name":"result",}}	{{"name":"result"}}	Remove trailing comma.	JSON
<div><p>test</div></p>	<div><p>test</p></div>	Nest properly.	HTML
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
if (item = 65) {}	if (item == 65) {}	Use ==.	Dart
[52, 64, 23	[52, 64, 23]	Close bracket.	Ruby
if result = 51	if result == 51	Use ==.	Ruby
WHERE age = '23'	WHERE age = 23	Don't quote integer.	SQL
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
{{"status":"message" "title":41}}	{{"status":"message", "title":41}}	Add comma.	JSON
try {{ throw 'world'; }} catch(e) {{}}	try {{ throw new Error('world'); }} catch(e) {{}}	Throw Error objects.	JavaScript
console.log('output'	console.log('output')	Close parenthesis.	JavaScript
p {{ color: blue }}	p {{ color: blue; }}	Add semicolon.	CSS
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
SELECT id email FROM products;	SELECT id, email FROM products;	Add comma.	SQL
temp = 79	temp=79	No spaces.	Shell
let mut foo=31; let r1=&mut foo; let r2=&mut foo;	let mut foo=31; {{ let r1=&mut foo; }} let r2=&mut foo;	Only one mutable borrow.	Rust
[7, 39, 27	[7, 39, 27]	Close bracket.	Python
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
[x*x for x in items if x > 76]	[x*x for x in items if x > 76]	Correct list comprehension.	Python
let z = 'result'	let z = "result"	Double quotes.	Swift

disp('result')

Correct.

MATLAB

name: test age: 60

Correct.

YAML

if item = 64

if item == 64

Use ==.

Go

arr[7]

if arr.indices.contains(7) {{ arr[7] }}

Check index.

Swift

let count: number | null = null; count.toFixed(43);

let count: number | null = null; if(count!==null) count.toFixed(43);

Null check.

TypeScript

items[6]

if (items.indices.contains(6)) items[6]

Check index.

Kotlin

if result = 93

if result == 93

Use ==.

MATLAB

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

if data = 94 then print('data') end

if data == 94 then print('data') end

Use ==.

Lua

if (val = 54)

if (val == 54)

Use ==.

Scala

void main() {{ print('data') }}

void main() {{ print('data'); }}

Add semicolon.

Dart

if z = 56:

if z == 56:

Use == for comparison.

Python

<hr>

Self-closing.

HTML

["message", 64]

Correct.

JSON

package main func main() {{}}

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

Import needed.

Go

class Person {{ int num; }};

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

Make public.

C++

let c: i32 = "message";

let c: &str = "message";

Type mismatch.

Rust

UPDATE orders SET email='data' WHERE email=46

UPDATE orders SET email='data' WHERE email=46;

Add semicolon.

SQL

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

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

Clone to avoid move.

Rust

val data = 74; data = 79

var data = 74; data = 79

Use var for reassignment.

Scala

cin >> count;

int count; cin >> count;

Declare variable.

C++

for (int i=0; i<39; i++) {{}}

Correct.

Java

function compute() {{ echo 'output'; }}

Correct.

PHP

h1 {{ font-size:25px color:#333; }}

h1 {{ font-size:25px; color:#333; }}

Add semicolon.

CSS

match foo {{ 1 => {{}} }}

match foo {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

function test() {{ return {{key:'message'}} }}

function test() {{ return {{key:'message'}}; }}

Return object on same line.

JavaScript

div {{ color=#fff; }}

div {{ color: #fff; }}

Use colon.

CSS

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

Correct.

Lua

String name = 'world';

Correct.

Dart

ArrayList list = new ArrayList();

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

Use generics.

Java

print 'hello'

print('hello')

Parentheses for function call.

Lua

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

Correct.

Java

var x int

Correct.

Go

String val = 'output';

String val = "output";

Double quotes.

Java

int items[88]; items[88]=5;

int items[88]; if(88<88){{}} else items[88]=5;

Bounds check.

C++

if ($c = 2) {{}}

if ($c -eq 2) {{}}

Use -eq.

PowerShell

Close li.

HTML

int* p = nullptr; *p=5;

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

Allocate memory.

C++

if (result = 97)

if (result == 97)

Use ==.

R

lambda x: x+1

Correct lambda.

Python

def test(data): return data + 1

Correct.

Python

int main() {{ return 0; }}

Correct.

C++

val data = 'data'

val data = "data"

Double quotes.

Kotlin

System.out.println('test')

System.out.println('test');

Add semicolon.

Java

let bar = 48; let bar = 29;

let bar = 48; bar = 29;

Duplicate declaration.

JavaScript

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

Correct.

Shell

let result: number = 'info';

let result: string = 'info';

Fix type.

TypeScript

val a: Int = 'result'

val a: String = 'result'

Fix type.

Kotlin

<br>

Self-closing.

HTML

let str = String::from("world"); let ref=&str; str.push_str("!");

let mut str = String::from("world"); let ref=&str; println!("{{}}", ref); str.push_str("!");

Cannot mutate while borrowed.

Rust

{ "name": "output" }

Correct.

JSON

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

Correct.

PowerShell

function render(foo) print(foo) end

Correct.

Lua

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

class = 'test'

class_name = 'test'

'class' is a keyword.

Python

data[31]

if (length(data) >= 31) data[31]

Check length.

R

if (bar = 26) {{}}

if (bar == 26) {{}}

Use ==.

Java

random.sqrt(15)

import random random.sqrt(15)

Import module first.

Python

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

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

Make field public.

Java

print('info')

Correct.

R

jwt.sign({{id:78}}, 'secret');

jwt.sign({{id:78}}, 'secret', {{expiresIn:'15m'}});

Add expiration.

Node.js

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

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

Type not in union.

TypeScript

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

Correct.

CSS

list: - item1 - item2

Correct.

YAML

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

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

Add return type Unit.

Scala

if (c = 85) {{}}

if (c === 85) {{}}

Use === for equality.

JavaScript

class Item def method end end

Correct.

Ruby

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

Correct.

Dart

SELECT * FROM users WHRE name=81;

SELECT * FROM users WHERE name=81;

Fix WHERE.

SQL

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

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

Initialize variable.

Java

$data[29]

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

Check bounds.

PowerShell

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

Correct.

MATLAB

temp = world

temp = 'world'

Quote strings.

Python

'message' + 29

'message' + str(29)

Can't add int to string.

Python

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

Correct.

Python

const val = 43; val = 10;

let val = 43; val = 10;

Cannot reassign const.

JavaScript

int[] data = new int[61]; data[61] = 5;

int[] data = new int[61]; if (61 < data.length) data[61] = 5;

Check bounds.

Java

SELECT COUNT(*) FROM items

SELECT COUNT(*) FROM items;

Missing semicolon.

SQL

function baz(): void {{ return 71; }}

function baz(): number {{ return 71; }}

Return type mismatch.

TypeScript

$result = 9; if ($result = 9) {{}}

$result = 9; if ($result == 9) {{}}

Use ==.

PHP

Remove trailing comma.

JSON

Nest properly.

HTML

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

if (item = 65) {}

if (item == 65) {}

Use ==.

Dart

[52, 64, 23

[52, 64, 23]

Close bracket.

Ruby

if result = 51

if result == 51

Use ==.

Ruby

WHERE age = '23'

WHERE age = 23

Don't quote integer.

SQL

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

Add comma.

JSON

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

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

Throw Error objects.

JavaScript

console.log('output'

console.log('output')

Close parenthesis.

JavaScript

p {{ color: blue }}

p {{ color: blue; }}

Add semicolon.

CSS

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

Correct.

R

SELECT id email FROM products;

SELECT id, email FROM products;

Add comma.

SQL

temp = 79

temp=79

No spaces.

Shell

let mut foo=31; let r1=&mut foo; let r2=&mut foo;

let mut foo=31; {{ let r1=&mut foo; }} let r2=&mut foo;

Only one mutable borrow.

Rust

[7, 39, 27

[7, 39, 27]

Close bracket.

Python

Add rel for security.

HTML

[x*x for x in items if x > 76]

Correct list comprehension.

Python

let z = 'result'

let z = "result"

Double quotes.

Swift