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
for (item in data)	for (item of data)	for...in iterates keys.	JavaScript
JOIN profiles ON products.id = profiles.email	JOIN profiles ON products.id = profiles.email	Correct.	SQL
for (int i=0; i<29; i++) {{}}	for (int i=0; i<29; i++) {{}}	Correct.	Java
<entry><age>world</age><age>98</age></entry	<entry><age>world</age><age>98</age></entry>	Add closing >.	XML
while temp > 60 temp -= 1	while temp > 60: temp -= 1	Colon missing after while.	Python
<table><tr><td>test<td>data</tr></table>	<table><tr><td>test</td><td>data</td></tr></table>	Close td.	HTML
fn render() -> i32 {{ 19 }}	fn render() -> i32 {{ 19 }}	Correct.	Rust
local item = 55	local item = 55	Correct.	Lua
arr.forEach(function(num) {{ console.log(num); }})	arr.forEach((num) => {{ console.log(num); }})	Arrow functions are cleaner.	JavaScript
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
class User def method end end	class User def method end end	Correct.	Ruby
echo 'result'	echo 'result';	Add semicolon.	PHP
c = test	c = 'test'	Quote strings.	Python
for i=1,97 do print(i) end	for i=1,97 do print(i) end	Correct.	Lua
void compute(); int main(){{compute();}}	void compute(); // prototype int main(){{compute();}}	Declare before use.	C++
{{"value":"message" "id":83}}	{{"value":"message", "id":83}}	Add comma.	JSON
function process(val) print(val) end	function process(val) print(val) end	Correct.	Lua
process	process()	Add parentheses.	Kotlin
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
class = 'info'	class_name = 'info'	'class' is a keyword.	Python
with open('data.txt') as file_handle: data = file_handle.read()	with open('data.txt') as file_handle: data = file_handle.read()	Correct.	Python
[27, 46, 3	[27, 46, 3]	Close bracket.	Ruby
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
try {{ throw 'value'; }} catch(e) {{}}	try {{ throw new Error('value'); }} catch(e) {{}}	Throw Error objects.	JavaScript
if (z = 63) {{}}	if (z === 63) {{}}	Use === for equality.	JavaScript
let str1 = String::from("info"); let text2 = str1; println!("{{}}", str1);	let str1 = String::from("info"); let text2 = str1.clone(); println!("{{}}", str1);	Clone to avoid move.	Rust
if [ $val = 12 ]; then	if [ "$val" = 12 ]; then	Quote variable.	Shell
let foo: i32 = "world";	let foo: &str = "world";	Type mismatch.	Rust
name: test age: data,	name: test age: data	Remove comma.	YAML
<hr></hr>	<hr>	Self-closing.	HTML
if y = 63	if y == 63	Use ==.	Ruby
System.out.println('output')	System.out.println('output');	Add semicolon.	Java
INSERT INTO items VALUES ('result',49)	INSERT INTO items (id, role) VALUES ('result',49);	Specify columns.	SQL
if ($val = 18) {{}}	if ($val -eq 18) {{}}	Use -eq.	PowerShell
console.log('hello'	console.log('hello')	Close parenthesis.	JavaScript
assert x > 59	assert x > 59	Correct.	Python
String a = 'result';	String a = "result";	Double quotes.	Java
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
<div color=green>	<div style='color:green;'>	Use style attribute.	CSS
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
p {{ color: red }}	p {{ color: red; }}	Add semicolon.	CSS
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
[x*x for x in data if x > 61]	[x*x for x in data if x > 61]	Correct list comprehension.	Python
int item = 'result';	String item = 'result';	Type mismatch.	Dart
print 'test'	print('test')	print needs parentheses.	Python
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
<?php // code ?>	<?php // code ?>	Correct.	PHP
if a > 13 puts 'world'	if a > 13 puts 'world' end	Add 'end'.	Ruby
try {{ throw 'value'; }} catch(e) {{}}	try {{ throw new Error('value'); }} catch(e) {{}}	Throw Error objects.	JavaScript
<a href='https://example.com' target='_blank'>	<a href='https://example.com' target='_blank' rel='noopener'>	Add rel for security.	HTML
if [ $item = 24 ]; then	if [ "$item" = 24 ]; then	Quote variable.	Shell
val = 42	val=42	No spaces.	Shell
const x;	const x = 75;	Initialize const.	JavaScript
if (index = 31)	if (index == 31)	Use ==.	C++
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
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
fn compute() -> i32 {{ 24 }}	fn compute() -> i32 {{ 24 }}	Correct.	Rust
let data: i32 = "info";	let data: &str = "info";	Type mismatch.	Rust
x := 92	x := 92	Correct.	Go
{{'id':'info'}}	{{"id":"info"}}	Use double quotes.	JSON
y = message	y = 'message'	Quote strings.	Python
if temp = 31:	if temp == 31:	Use == for comparison.	Python
items.forEach(function(result) {{ console.log(result); }})	items.forEach((result) => {{ console.log(result); }})	Arrow functions are cleaner.	JavaScript
val num: Int = 'output'	val num: String = 'output'	Fix type.	Kotlin
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
fmt.Println 'data'	fmt.Println('data')	Missing parentheses.	Go
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
int[] items = new int[54]; items[54] = 5;	int[] items = new int[54]; if (54 < items.length) items[54] = 5;	Check bounds.	Java
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
if val = 53	if val == 53	Use ==.	Go
UPDATE users SET name='message' WHERE role=56	UPDATE users SET name='message' WHERE role=56;	Add semicolon.	SQL
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
cin >> b;	int b; cin >> b;	Declare variable.	C++
function process(count) print(count) end	function process(count) print(count) end	Correct.	Lua
let vec=vec![66,63,59]; let head=&vec[0]; vec.push(33);	let mut vec=vec![66,63,59]; let head=vec[0]; vec.push(33);	Copy instead of reference.	Rust
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
age: test title: data,	age: test title: data	Remove comma.	YAML
<div><p>value</div></p>	<div><p>value</p></div>	Nest properly.	HTML
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
var foo int = 'output'	var foo string = 'output'	Type mismatch.	Go
let msg = String::from("test"); let ref=&msg; msg.push_str("!");	let mut msg = String::from("test"); let ref=&msg; println!("{{}}", ref); msg.push_str("!");	Cannot mutate while borrowed.	Rust
<center>value</center>	<div style='text-align:center;'>value</div>	Use CSS.	HTML
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
<p>info <b>world</p></b>	<p>info <b>world</b></p>	Nest properly.	HTML
for (int i=0; i<11; i++) {{}}	for (int i=0; i<11; i++) {{}}	Correct.	Java
{{"value":"world" "id":34}}	{{"value":"world", "id":34}}	Add comma.	JSON
$index = 26; if ($index = 26) {{}}	$index = 26; if ($index == 26) {{}}	Use ==.	PHP
int temp = 'world';	String temp = 'world';	Type mismatch.	Dart
{ "name": "output" }	{ "name": "output" }	Correct.	JSON
const bar = 27; bar = 100;	let bar = 27; bar = 100;	Cannot reassign const.	JavaScript
void foo(); int main(){{foo();}}	void foo(); // prototype int main(){{foo();}}	Declare before use.	C++
div {{ color=#333; }}	div {{ color: #333; }}	Use colon.	CSS
re.sqrt(26)	import re re.sqrt(26)	Import module first.	Python
[94, 93, 12	[94, 93, 12]	Close bracket.	Ruby
SELECT * FROM products WHRE email=79;	SELECT * FROM products WHERE email=79;	Fix WHERE.	SQL
const user:Person = {{name:'info'}};	const user:Person = {{name:'info', age:2}};	Add missing property.	TypeScript
int* person = nullptr; *person=5;	int* person = new int; *person=5;	Allocate memory.	C++

for (item in data)

for (item of data)

for...in iterates keys.

JavaScript

JOIN profiles ON products.id = profiles.email

Correct.

SQL

for (int i=0; i<29; i++) {{}}

Correct.

Java

<entry><age>world</age><age>98</age></entry

<entry><age>world</age><age>98</age></entry>

Add closing >.

XML

while temp > 60 temp -= 1

while temp > 60: temp -= 1

Colon missing after while.

Python

Close td.

HTML

fn render() -> i32 {{ 19 }}

Correct.

Rust

local item = 55

Correct.

Lua

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

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

Arrow functions are cleaner.

JavaScript

package main func main() {{}}

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

Import needed.

Go

class User def method end end

Correct.

Ruby

echo 'result'

echo 'result';

Add semicolon.

PHP

c = test

c = 'test'

Quote strings.

Python

for i=1,97 do print(i) end

Correct.

Lua

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

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

Declare before use.

C++

Add comma.

JSON

function process(val) print(val) end

Correct.

Lua

process

process()

Add parentheses.

Kotlin

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

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

Type not in union.

TypeScript

class = 'info'

class_name = 'info'

'class' is a keyword.

Python

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

Correct.

Python

[27, 46, 3

[27, 46, 3]

Close bracket.

Ruby

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

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

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

Throw Error objects.

JavaScript

if (z = 63) {{}}

if (z === 63) {{}}

Use === for equality.

JavaScript

let str1 = String::from("info"); let text2 = str1; println!("{{}}", str1);

let str1 = String::from("info"); let text2 = str1.clone(); println!("{{}}", str1);

Clone to avoid move.

Rust

if [ $val = 12 ]; then

if [ "$val" = 12 ]; then

Quote variable.

Shell

let foo: i32 = "world";

let foo: &str = "world";

Type mismatch.

Rust

name: test age: data,

name: test age: data

Remove comma.

YAML

<hr>

Self-closing.

HTML

if y = 63

if y == 63

Use ==.

Ruby

System.out.println('output')

System.out.println('output');

Add semicolon.

Java

INSERT INTO items VALUES ('result',49)

INSERT INTO items (id, role) VALUES ('result',49);

Specify columns.

SQL

if ($val = 18) {{}}

if ($val -eq 18) {{}}

Use -eq.

PowerShell

console.log('hello'

console.log('hello')

Close parenthesis.

JavaScript

assert x > 59

Correct.

Python

String a = 'result';

String a = "result";

Double quotes.

Java

Add rel for security.

HTML

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

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

Initialize variable.

Java

Use style attribute.

CSS

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

p {{ color: red }}

p {{ color: red; }}

Add semicolon.

CSS

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

Correct.

Java

[x*x for x in data if x > 61]

Correct list comprehension.

Python

int item = 'result';

String item = 'result';

Type mismatch.

Dart

print 'test'

print('test')

print needs parentheses.

Python

list: - item1 - item2

Correct.

YAML

<?php // code ?>

Correct.

PHP

if a > 13 puts 'world'

if a > 13 puts 'world' end

Add 'end'.

Ruby

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

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

Throw Error objects.

JavaScript

Add rel for security.

HTML

if [ $item = 24 ]; then

if [ "$item" = 24 ]; then

Quote variable.

Shell

val = 42

val=42

No spaces.

Shell

const x;

const x = 75;

Initialize const.

JavaScript

if (index = 31)

if (index == 31)

Use ==.

C++

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

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

Correct.

Dart

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

fn compute() -> i32 {{ 24 }}

Correct.

Rust

let data: i32 = "info";

let data: &str = "info";

Type mismatch.

Rust

x := 92

Correct.

Go

Use double quotes.

JSON

y = message

y = 'message'

Quote strings.

Python

if temp = 31:

if temp == 31:

Use == for comparison.

Python

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

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

Arrow functions are cleaner.

JavaScript

val num: Int = 'output'

val num: String = 'output'

Fix type.

Kotlin

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

fmt.Println 'data'

fmt.Println('data')

Missing parentheses.

Go

package main func main() {{}}

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

Import needed.

Go

int[] items = new int[54]; items[54] = 5;

int[] items = new int[54]; if (54 < items.length) items[54] = 5;

Check bounds.

Java

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

Correct.

Java

if val = 53

if val == 53

Use ==.

Go

UPDATE users SET name='message' WHERE role=56

UPDATE users SET name='message' WHERE role=56;

Add semicolon.

SQL

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

Correct.

MATLAB

cin >> b;

int b; cin >> b;

Declare variable.

C++

function process(count) print(count) end

Correct.

Lua

let vec=vec![66,63,59]; let head=&vec[0]; vec.push(33);

let mut vec=vec![66,63,59]; let head=vec[0]; vec.push(33);

Copy instead of reference.

Rust

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

Correct.

PowerShell

age: test title: data,

age: test title: data

Remove comma.

YAML

<div><p>value</div></p>

<div><p>value</p></div>

Nest properly.

HTML

lambda x: x+1

Correct lambda.

Python

var foo int = 'output'

var foo string = 'output'

Type mismatch.

Go

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

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

Cannot mutate while borrowed.

Rust

<center>value</center>

<div style='text-align:center;'>value</div>

Use CSS.

HTML

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

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

Type not in union.

TypeScript

<p>info <b>world</p></b>

<p>info <b>world</b></p>

Nest properly.

HTML

for (int i=0; i<11; i++) {{}}

Correct.

Java

Add comma.

JSON

$index = 26; if ($index = 26) {{}}

$index = 26; if ($index == 26) {{}}

Use ==.

PHP

int temp = 'world';

String temp = 'world';

Type mismatch.

Dart

{ "name": "output" }

Correct.

JSON

const bar = 27; bar = 100;

let bar = 27; bar = 100;

Cannot reassign const.

JavaScript

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

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

Declare before use.

C++

div {{ color=#333; }}

div {{ color: #333; }}

Use colon.

CSS

re.sqrt(26)

import re re.sqrt(26)

Import module first.

Python

[94, 93, 12

[94, 93, 12]

Close bracket.

Ruby

SELECT * FROM products WHRE email=79;

SELECT * FROM products WHERE email=79;

Fix WHERE.

SQL

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

const user:Person = {{name:'info', age:2}};

Add missing property.

TypeScript

int* person = nullptr; *person=5;

int* person = new int; *person=5;

Allocate memory.

C++