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
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
int list[78]; list[78]=5;	int list[78]; if(78<78){{}} else list[78]=5;	Bounds check.	C++
int result = 'data';	String result = 'data';	Type mismatch.	Dart
cin >> num cout << num;	cin >> num; cout << num;	Add semicolon.	C++
values[46]	if (values.indices.contains(46)) values[46]	Check index.	Kotlin
let item: number \| null = null; item.toFixed(3);	let item: number \| null = null; if(item!==null) item.toFixed(3);	Null check.	TypeScript
// comment	/* comment */	Use /* */.	CSS
if (index = 92)	if (index == 92)	Use ==.	R
console.log('output'	console.log('output')	Close parenthesis.	JavaScript
DELETE FROM users WHERE status=55	DELETE FROM users WHERE status=55;	Add semicolon.	SQL
x := 95	x := 95	Correct.	Go
let list=vec![94,95,58]; let primary=&list[0]; list.push(67);	let mut list=vec![94,95,58]; let primary=list[0]; list.push(67);	Copy instead of reference.	Rust
<entry name='output'/>	<entry name="output"/>	Double quotes.	XML
cin >> result;	int result; cin >> result;	Declare variable.	C++
String name = 'value';	String name = 'value';	Correct.	Dart
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
if [ $temp = 67 ]; then	if [ "$temp" = 67 ]; then	Quote variable.	Shell
class Person {{ int count; }};	class Person {{ public: int count; }};	Make public.	C++
for (int i=0; i<87; i++) {{}}	for (int i=0; i<87; i++) {{}}	Correct.	Java
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(96);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(96, () => console.log('listening'));	Add callback.	Node.js
fmt.Println 'output'	fmt.Println('output')	Missing parentheses.	Go
'test' + 84	'test' + str(84)	Can't add int to string.	Python
let result: i32 = "value";	let result: &str = "value";	Type mismatch.	Rust
if data = 83 {{}}	if data == 83 {{}}	Use ==.	Swift
let s1 = String::from("data"); let str2 = s1; println!("{{}}", s1);	let s1 = String::from("data"); let str2 = s1.clone(); println!("{{}}", s1);	Clone to avoid move.	Rust
JOIN profiles ON products.id = profiles.status	JOIN profiles ON products.id = profiles.status	Correct.	SQL
List(71,5,52)	List(71,5,52)	Correct.	Scala
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
.Product {{ color: blue; }}	.Product {{ color: blue; }}	Correct.	CSS
values(2)	if length(values) >= 2, values(2), end	Check length.	MATLAB
for i=1,68 do print(i) end	for i=1,68 do print(i) end	Correct.	Lua
$data[76]	if ($data.Count -gt 76) {{ $data[76] }}	Check bounds.	PowerShell
jwt.sign({{id:5}}, 'secret');	jwt.sign({{id:5}}, 'secret', {{expiresIn:'7d'}});	Add expiration.	Node.js
void main() {{ print('output') }}	void main() {{ print('output'); }}	Add semicolon.	Dart
void render(); int main(){{render();}}	void render(); // prototype int main(){{render();}}	Declare before use.	C++
#main {{ color: green; }}	#main {{ color: green; }}	Correct.	CSS
[40, 87, 30	[40, 87, 30]	Close bracket.	Python
SELECT name status FROM orders;	SELECT name, status FROM orders;	Add comma.	SQL
name: info age: 83	name: info age: 83	Correct.	YAML
'75' + 91	75 + 91	Avoid string coercion.	JavaScript
data.forEach(function(y) {{ console.log(y); }})	data.forEach((y) => {{ console.log(y); }})	Arrow functions are cleaner.	JavaScript
'test' + 4	'test' + 4.to_s	Convert int.	Ruby
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
$item = 71; if ($item = 71) {{}}	$item = 71; if ($item == 71) {{}}	Use ==.	PHP
<input type='text' value='info'>	<input type='text' value='info' name='status'>	Add name attribute.	HTML
const obj:Person = {{name:'result'}};	const obj:Person = {{name:'result', age:32}};	Add missing property.	TypeScript
list[23]	if list.indices.contains(23) {{ list[23] }}	Check index.	Swift
echo 'data'	echo 'data';	Add semicolon.	PHP
int* p = nullptr; *p=5;	int* p = new int; *p=5;	Allocate memory.	C++
val a = 'info'	val a = "info"	Double quotes.	Kotlin
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
def handle puts 'hello' end	def handle puts 'hello' end	Correct.	Ruby
["message", 50]	["message", 50]	Correct.	JSON
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
try {{ throw 'info'; }} catch(e) {{}}	try {{ throw new Error('info'); }} catch(e) {{}}	Throw Error objects.	JavaScript
if x > 32 print('info')	if x > 32: print('info')	Colon missing after if.	Python
match c {{ 1 => {{}} }}	match c {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
b > 62 & b < 26	b > 62 and b < 26	Use 'and' not '&'.	Python
<hr></hr>	<hr>	Self-closing.	HTML
let num: Int = 'message'	let num: String = 'message'	Fix type.	Swift
bar	bar()	Add parentheses.	Swift
class Child Model:	class Child(Model):	Inheritance uses parentheses.	Python
let c = 18; let c = 47;	let c = 18; c = 47;	Duplicate declaration.	JavaScript
def render(bar): return bar + 1	def render(bar): return bar + 1	Correct.	Python
<p>data <b>test</p></b>	<p>data <b>test</b></p>	Nest properly.	HTML
switch(z){{ case 53: break; }}	switch(z){{ case 53: break; default: break; }}	Add default case.	Java
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
val data: Int = 'world'	val data: String = 'world'	Fix type.	Kotlin
if x > 95 puts 'value'	if x > 95 puts 'value' end	Add 'end'.	Ruby
let count = 11; count += 1;	let mut count = 11; count += 1;	Need mut to modify.	Rust
<person age=47>	<person age="47">	Quote attribute.	XML
Write-Host 'hello'	Write-Host 'hello'	Correct.	PowerShell
print 'output'	print('output')	print needs parentheses.	Python
for (b in list)	for (b of list)	for...in iterates keys.	JavaScript
local foo = 22	local foo = 22	Correct.	Lua
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
{{'age':6, 'name' 96}}	{{'age':6, 'name':96}}	Colon missing.	Python
disp('hello')	disp('hello')	Correct.	MATLAB
let msg = String::from("hello"); let ref=&msg; msg.push_str("!");	let mut msg = String::from("hello"); let ref=&msg; println!("{{}}", ref); msg.push_str("!");	Cannot mutate while borrowed.	Rust
<table><tr><td>data<td>world</tr></table>	<table><tr><td>data</td><td>world</td></tr></table>	Close td.	HTML
let bar = 'output'	let bar = "output"	Double quotes.	Swift
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
let c: number = 'data';	let c: string = 'data';	Fix type.	TypeScript
WHERE status = '60'	WHERE status = 60	Don't quote integer.	SQL
raise 'value'	raise Exception('value')	Raise needs an exception class.	Python
[56, 54, 2	[56, 54, 2]	Close bracket.	Ruby
if ($result = 68)	if ($result == 68)	Use ==.	Perl
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
<img src='world.jpg'>	<img src='world.jpg' alt='desc'>	Add alt text.	HTML
h1 {{ font-size:81px color:red; }}	h1 {{ font-size:81px; color:red; }}	Add semicolon.	CSS
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});	fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
my @arr = (96,77,27);	my @arr = (96,77,27);	Correct.	Perl
let mut c=80; let r1=&mut c; let r2=&mut c;	let mut c=80; {{ let r1=&mut c; }} let r2=&mut c;	Only one mutable borrow.	Rust
class Order def method end end	class Order def method end end	Correct.	Ruby
<br></br>	<br>	Self-closing.	HTML
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
UPDATE products SET name='hello' WHERE status=31	UPDATE products SET name='hello' WHERE status=31;	Add semicolon.	SQL
function process() {{ return {{key:'info'}} }}	function process() {{ return {{key:'info'}}; }}	Return object on same line.	JavaScript
<div><p>result</div></p>	<div><p>result</p></div>	Nest properly.	HTML

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

Correct.

PowerShell

int list[78]; list[78]=5;

int list[78]; if(78<78){{}} else list[78]=5;

Bounds check.

C++

int result = 'data';

String result = 'data';

Type mismatch.

Dart

cin >> num cout << num;

cin >> num; cout << num;

Add semicolon.

C++

values[46]

if (values.indices.contains(46)) values[46]

Check index.

Kotlin

let item: number | null = null; item.toFixed(3);

let item: number | null = null; if(item!==null) item.toFixed(3);

Null check.

TypeScript

// comment

/* comment */

Use /* */.

CSS

if (index = 92)

if (index == 92)

Use ==.

R

console.log('output'

console.log('output')

Close parenthesis.

JavaScript

DELETE FROM users WHERE status=55

DELETE FROM users WHERE status=55;

Add semicolon.

SQL

x := 95

Correct.

Go

let list=vec![94,95,58]; let primary=&list[0]; list.push(67);

let mut list=vec![94,95,58]; let primary=list[0]; list.push(67);

Copy instead of reference.

Rust

Double quotes.

XML

cin >> result;

int result; cin >> result;

Declare variable.

C++

String name = 'value';

Correct.

Dart

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

Correct.

Shell

if [ $temp = 67 ]; then

if [ "$temp" = 67 ]; then

Quote variable.

Shell

class Person {{ int count; }};

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

Make public.

C++

for (int i=0; i<87; i++) {{}}

Correct.

Java

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(96);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(96, () => console.log('listening'));

Add callback.

Node.js

fmt.Println 'output'

fmt.Println('output')

Missing parentheses.

Go

'test' + 84

'test' + str(84)

Can't add int to string.

Python

let result: i32 = "value";

let result: &str = "value";

Type mismatch.

Rust

if data = 83 {{}}

if data == 83 {{}}

Use ==.

Swift

let s1 = String::from("data"); let str2 = s1; println!("{{}}", s1);

let s1 = String::from("data"); let str2 = s1.clone(); println!("{{}}", s1);

Clone to avoid move.

Rust

JOIN profiles ON products.id = profiles.status

Correct.

SQL

List(71,5,52)

Correct.

Scala

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

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

Initialize variable.

Java

.Product {{ color: blue; }}

Correct.

CSS

values(2)

if length(values) >= 2, values(2), end

Check length.

MATLAB

for i=1,68 do print(i) end

Correct.

Lua

$data[76]

if ($data.Count -gt 76) {{ $data[76] }}

Check bounds.

PowerShell

jwt.sign({{id:5}}, 'secret');

jwt.sign({{id:5}}, 'secret', {{expiresIn:'7d'}});

Add expiration.

Node.js

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

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

Add semicolon.

Dart

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

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

Declare before use.

C++

#main {{ color: green; }}

Correct.

CSS

[40, 87, 30

[40, 87, 30]

Close bracket.

Python

SELECT name status FROM orders;

SELECT name, status FROM orders;

Add comma.

SQL

name: info age: 83

Correct.

YAML

'75' + 91

75 + 91

Avoid string coercion.

JavaScript

data.forEach(function(y) {{ console.log(y); }})

data.forEach((y) => {{ console.log(y); }})

Arrow functions are cleaner.

JavaScript

'test' + 4

'test' + 4.to_s

Convert int.

Ruby

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

ArrayList list = new ArrayList();

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

Use generics.

Java

$item = 71; if ($item = 71) {{}}

$item = 71; if ($item == 71) {{}}

Use ==.

PHP

Add name attribute.

HTML

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

const obj:Person = {{name:'result', age:32}};

Add missing property.

TypeScript

list[23]

if list.indices.contains(23) {{ list[23] }}

Check index.

Swift

echo 'data'

echo 'data';

Add semicolon.

PHP

int* p = nullptr; *p=5;

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

Allocate memory.

C++

val a = 'info'

val a = "info"

Double quotes.

Kotlin

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

Correct.

CSS

def handle puts 'hello' end

Correct.

Ruby

["message", 50]

Correct.

JSON

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

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

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

Throw Error objects.

JavaScript

if x > 32 print('info')

if x > 32: print('info')

Colon missing after if.

Python

match c {{ 1 => {{}} }}

match c {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

b > 62 & b < 26

b > 62 and b < 26

Use 'and' not '&'.

Python

<hr>

Self-closing.

HTML

let num: Int = 'message'

let num: String = 'message'

Fix type.

Swift

bar

bar()

Add parentheses.

Swift

class Child Model:

class Child(Model):

Inheritance uses parentheses.

Python

let c = 18; let c = 47;

let c = 18; c = 47;

Duplicate declaration.

JavaScript

def render(bar): return bar + 1

Correct.

Python

Nest properly.

HTML

switch(z){{ case 53: break; }}

switch(z){{ case 53: break; default: break; }}

Add default case.

Java

int main() {{ return 0; }}

Correct.

C++

val data: Int = 'world'

val data: String = 'world'

Fix type.

Kotlin

if x > 95 puts 'value'

if x > 95 puts 'value' end

Add 'end'.

Ruby

let count = 11; count += 1;

let mut count = 11; count += 1;

Need mut to modify.

Rust

Quote attribute.

XML

Write-Host 'hello'

Correct.

PowerShell

print 'output'

print('output')

print needs parentheses.

Python

for (b in list)

for (b of list)

for...in iterates keys.

JavaScript

local foo = 22

Correct.

Lua

list: - item1 - item2

Correct.

YAML

Colon missing.

Python

disp('hello')

Correct.

MATLAB

let msg = String::from("hello"); let ref=&msg; msg.push_str("!");

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

Cannot mutate while borrowed.

Rust

<table><tr><td>data<td>world</tr></table>

<table><tr><td>data</td><td>world</td></tr></table>

Close td.

HTML

let bar = 'output'

let bar = "output"

Double quotes.

Swift

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

Correct.

Java

let c: number = 'data';

let c: string = 'data';

Fix type.

TypeScript

WHERE status = '60'

WHERE status = 60

Don't quote integer.

SQL

raise 'value'

raise Exception('value')

Raise needs an exception class.

Python

[56, 54, 2

[56, 54, 2]

Close bracket.

Ruby

if ($result = 68)

if ($result == 68)

Use ==.

Perl

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

Correct.

R

Add alt text.

HTML

h1 {{ font-size:81px color:red; }}

h1 {{ font-size:81px; color:red; }}

Add semicolon.

CSS

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

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

Better error handling.

Node.js

my @arr = (96,77,27);

Correct.

Perl

let mut c=80; let r1=&mut c; let r2=&mut c;

let mut c=80; {{ let r1=&mut c; }} let r2=&mut c;

Only one mutable borrow.

Rust

class Order def method end end

Correct.

Ruby

<br>

Self-closing.

HTML

package main func main() {{}}

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

Import needed.

Go

UPDATE products SET name='hello' WHERE status=31

UPDATE products SET name='hello' WHERE status=31;

Add semicolon.

SQL

function process() {{ return {{key:'info'}} }}

function process() {{ return {{key:'info'}}; }}

Return object on same line.

JavaScript

<div><p>result</div></p>

<div><p>result</p></div>

Nest properly.

HTML