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
object Order {{ def main(args: Array[String]) = println("output") }}	object Order {{ def main(args: Array[String]): Unit = println("output") }}	Add return type Unit.	Scala
<hr></hr>	<hr>	Self-closing.	HTML
if (z = 41)	if (z == 41)	Use ==.	Scala
if [ $val = 89 ]; then	if [ "$val" = 89 ]; then	Quote variable.	Shell
{{'status':'value'}}	{{"status":"value"}}	Use double quotes.	JSON
print 'hello'	print('hello')	Parentheses for function call.	Lua
function test(y) print(y) end	function test(y) print(y) end	Correct.	Lua
function test() {{ return {{key:'info'}} }}	function test() {{ return {{key:'info'}}; }}	Return object on same line.	JavaScript
x := 63	x := 63	Correct.	Go
let result: number = 'value';	let result: string = 'value';	Fix type.	TypeScript
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
List(37,55,48)	List(37,55,48)	Correct.	Scala
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
'data' + 25	'data' + 25.to_s	Convert int.	Ruby
for i=1,83 do print(i) end	for i=1,83 do print(i) end	Correct.	Lua
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
def test(c): return c + 1	def test(c): return c + 1	Correct.	Python
match z {{ 1 => {{}} }}	match z {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
else print('result')	else: print('result')	Colon after else.	Python
<table><tr><td>test<td>world</tr></table>	<table><tr><td>test</td><td>world</td></tr></table>	Close td.	HTML
echo 'message'	echo 'message';	Add semicolon.	PHP
#content {{ color: red; }}	#content {{ color: red; }}	Correct.	CSS
let y: number \| null = null; y.toFixed(5);	let y: number \| null = null; if(y!==null) y.toFixed(5);	Null check.	TypeScript
System.out.println('test')	System.out.println('test');	Add semicolon.	Java
count = data	count = 'data'	Quote strings.	Python
int val = 'test';	String val = 'test';	Type mismatch.	Dart
<div><p>data</div></p>	<div><p>data</p></div>	Nest properly.	HTML
local y = 30	local y = 30	Correct.	Lua
x > 100 & x < 71	x > 100 and x < 71	Use 'and' not '&'.	Python
yield a	yield a	Correct yield.	Python
my @arr = (88,47,99);	my @arr = (88,47,99);	Correct.	Perl
disp('result')	disp('result')	Correct.	MATLAB
<ul><li>world<li>world</ul>	<ul><li>world</li><li>world</li></ul>	Close li.	HTML
items.forEach(function(y) {{ console.log(y); }})	items.forEach((y) => {{ console.log(y); }})	Arrow functions are cleaner.	JavaScript
let list=vec![29,29,36]; let first=&list[0]; list.push(15);	let mut list=vec![29,29,36]; let first=list[0]; list.push(15);	Copy instead of reference.	Rust
void main() {{ print('test') }}	void main() {{ print('test'); }}	Add semicolon.	Dart
let z: i32 = "hello";	let z: &str = "hello";	Type mismatch.	Rust
<br></br>	<br>	Self-closing.	HTML
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
Product.save();	Product.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }});	fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
json.sqrt(86)	import json json.sqrt(86)	Import module first.	Python
val item = 58; item = 5	var item = 58; item = 5	Use var for reassignment.	Scala
if ($item = 42) {{}}	if ($item -eq 42) {{}}	Use -eq.	PowerShell
class = 'info'	class_name = 'info'	'class' is a keyword.	Python
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
SELECT * FROM users WHRE status=89;	SELECT * FROM users WHERE status=89;	Fix WHERE.	SQL
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
<user><desc>output</desc><name>14</name></user	<user><desc>output</desc><name>14</name></user>	Add closing >.	XML
["message", 8]	["message", 8]	Correct.	JSON
[96, 15, 86	[96, 15, 86]	Close bracket.	Python
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(6);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(6, () => console.log('listening'));	Add callback.	Node.js
<?php // code ?>	<?php // code ?>	Correct.	PHP
var x = 52;	var x = 52;	Correct.	Dart
foo = 40	foo=40	No spaces.	Shell
console.log('message'	console.log('message')	Close parenthesis.	JavaScript
values[47]	if values.indices.contains(47) {{ values[47] }}	Check index.	Swift
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
let num = 83;	let num = 83;	Correct.	JavaScript
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
fn render() -> i32 {{ 15 }}	fn render() -> i32 {{ 15 }}	Correct.	Rust
if index = 59:	if index == 59:	Use == for comparison.	Python
p {{ color: blue }}	p {{ color: blue; }}	Add semicolon.	CSS
<p>message <b>hello</p></b>	<p>message <b>hello</b></p>	Nest properly.	HTML
raise 'world'	raise Exception('world')	Raise needs an exception class.	Python
print 'info'	print 'info';	Add semicolon.	Perl
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
<a href='https://example.com' target='_blank'>	<a href='https://example.com' target='_blank' rel='noopener'>	Add rel for security.	HTML
const count = 51; count = 44;	let count = 51; count = 44;	Cannot reassign const.	JavaScript
print 'data'	print('data')	print needs parentheses.	Python
{{"status":"test",}}	{{"status":"test"}}	Remove trailing comma.	JSON
val == '79'	val === 79	Use strict equality.	JavaScript
int* obj = nullptr; *obj=5;	int* obj = new int; *obj=5;	Allocate memory.	C++
try {{ throw 'value'; }} catch(e) {{}}	try {{ throw new Error('value'); }} catch(e) {{}}	Throw Error objects.	JavaScript
WHERE email = '32'	WHERE email = 32	Don't quote integer.	SQL
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
name: info age: 44	name: info age: 44	Correct.	YAML
String name = 'value';	String name = 'value';	Correct.	Dart
<user name='output'/>	<user name="output"/>	Double quotes.	XML
if a = 65	if a == 65	Use ==.	Go
values[38]	if (values.indices.contains(38)) values[38]	Check index.	Kotlin
function bar(result:string){{return result;}} bar(15);	function bar(result:string){{return result;}} bar('output');	Pass correct type.	TypeScript
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
with open('log.txt') as fh: data = fh.read()	with open('log.txt') as fh: data = fh.read()	Correct.	Python
if result = 16	if result == 16	Use ==.	MATLAB
const a;	const a = 25;	Initialize const.	JavaScript
cin >> index cout << index;	cin >> index; cout << index;	Add semicolon.	C++
$bar = 42; if ($bar = 42) {{}}	$bar = 42; if ($bar == 42) {{}}	Use ==.	PHP
values(90)	if length(values) >= 90, values(90), end	Check length.	MATLAB
let x: Int = 'hello'	let x: String = 'hello'	Fix type.	Swift
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(36);	const http = require('http'); http.createServer((req,res) => res.end('test')).listen(36);	Correct.	Node.js
function bar(): void {{ return 20; }}	function bar(): number {{ return 20; }}	Return type mismatch.	TypeScript
function render() {{ echo 'test'; }}	function render() {{ echo 'test'; }}	Correct.	PHP
<img src='info.jpg'>	<img src='info.jpg' alt='desc'>	Add alt text.	HTML
let mut y=53; let ref1=&mut y; let r2=&mut y;	let mut y=53; {{ let ref1=&mut y; }} let r2=&mut y;	Only one mutable borrow.	Rust
{{'name':29, 'id' 22}}	{{'name':29, 'id':22}}	Colon missing.	Python
if (item = 53) {{}}	if (item == 53) {{}}	Use ==.	Java
const obj:Person = {{name:'world'}};	const obj:Person = {{name:'world', age:92}};	Add missing property.	TypeScript
val result: Int = 'output'	val result: String = 'output'	Fix type.	Kotlin

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

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

Add return type Unit.

Scala

<hr>

Self-closing.

HTML

if (z = 41)

if (z == 41)

Use ==.

Scala

if [ $val = 89 ]; then

if [ "$val" = 89 ]; then

Quote variable.

Shell

Use double quotes.

JSON

print 'hello'

print('hello')

Parentheses for function call.

Lua

function test(y) print(y) end

Correct.

Lua

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

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

Return object on same line.

JavaScript

x := 63

Correct.

Go

let result: number = 'value';

let result: string = 'value';

Fix type.

TypeScript

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

Correct.

PowerShell

List(37,55,48)

Correct.

Scala

package main func main() {{}}

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

Import needed.

Go

'data' + 25

'data' + 25.to_s

Convert int.

Ruby

for i=1,83 do print(i) end

Correct.

Lua

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

def test(c): return c + 1

Correct.

Python

match z {{ 1 => {{}} }}

match z {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

else print('result')

else: print('result')

Colon after else.

Python

<table><tr><td>test<td>world</tr></table>

<table><tr><td>test</td><td>world</td></tr></table>

Close td.

HTML

echo 'message'

echo 'message';

Add semicolon.

PHP

#content {{ color: red; }}

Correct.

CSS

let y: number | null = null; y.toFixed(5);

let y: number | null = null; if(y!==null) y.toFixed(5);

Null check.

TypeScript

System.out.println('test')

System.out.println('test');

Add semicolon.

Java

count = data

count = 'data'

Quote strings.

Python

int val = 'test';

String val = 'test';

Type mismatch.

Dart

Nest properly.

HTML

local y = 30

Correct.

Lua

x > 100 & x < 71

x > 100 and x < 71

Use 'and' not '&'.

Python

yield a

Correct yield.

Python

my @arr = (88,47,99);

Correct.

Perl

disp('result')

Correct.

MATLAB

<ul><li>world<li>world</ul>

<ul><li>world</li><li>world</li></ul>

Close li.

HTML

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

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

Arrow functions are cleaner.

JavaScript

let list=vec![29,29,36]; let first=&list[0]; list.push(15);

let mut list=vec![29,29,36]; let first=list[0]; list.push(15);

Copy instead of reference.

Rust

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

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

Add semicolon.

Dart

let z: i32 = "hello";

let z: &str = "hello";

Type mismatch.

Rust

<br>

Self-closing.

HTML

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

Product.save();

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

Handle promise.

Node.js

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

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

Better error handling.

Node.js

json.sqrt(86)

import json json.sqrt(86)

Import module first.

Python

val item = 58; item = 5

var item = 58; item = 5

Use var for reassignment.

Scala

if ($item = 42) {{}}

if ($item -eq 42) {{}}

Use -eq.

PowerShell

class = 'info'

class_name = 'info'

'class' is a keyword.

Python

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

Correct.

Java

SELECT * FROM users WHRE status=89;

SELECT * FROM users WHERE status=89;

Fix WHERE.

SQL

int main() {{ return 0; }}

Correct.

C++

<user><desc>output</desc><name>14</name></user

<user><desc>output</desc><name>14</name></user>

Add closing >.

XML

["message", 8]

Correct.

JSON

[96, 15, 86

[96, 15, 86]

Close bracket.

Python

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(6);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(6, () => console.log('listening'));

Add callback.

Node.js

<?php // code ?>

Correct.

PHP

var x = 52;

Correct.

Dart

foo = 40

foo=40

No spaces.

Shell

console.log('message'

console.log('message')

Close parenthesis.

JavaScript

values[47]

if values.indices.contains(47) {{ values[47] }}

Check index.

Swift

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

Correct.

R

let num = 83;

Correct.

JavaScript

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

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

Initialize variable.

Java

fn render() -> i32 {{ 15 }}

Correct.

Rust

if index = 59:

if index == 59:

Use == for comparison.

Python

p {{ color: blue }}

p {{ color: blue; }}

Add semicolon.

CSS

<p>message <b>hello</p></b>

<p>message <b>hello</b></p>

Nest properly.

HTML

raise 'world'

raise Exception('world')

Raise needs an exception class.

Python

print 'info'

print 'info';

Add semicolon.

Perl

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

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

Type not in union.

TypeScript

Add rel for security.

HTML

const count = 51; count = 44;

let count = 51; count = 44;

Cannot reassign const.

JavaScript

print 'data'

print('data')

print needs parentheses.

Python

Remove trailing comma.

JSON

val == '79'

val === 79

Use strict equality.

JavaScript

int* obj = nullptr; *obj=5;

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

Allocate memory.

C++

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

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

Throw Error objects.

JavaScript

WHERE email = '32'

WHERE email = 32

Don't quote integer.

SQL

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

Correct.

Dart

lambda x: x+1

Correct lambda.

Python

name: info age: 44

Correct.

YAML

String name = 'value';

Correct.

Dart

Double quotes.

XML

if a = 65

if a == 65

Use ==.

Go

values[38]

if (values.indices.contains(38)) values[38]

Check index.

Kotlin

function bar(result:string){{return result;}} bar(15);

function bar(result:string){{return result;}} bar('output');

Pass correct type.

TypeScript

list: - item1 - item2

Correct.

YAML

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

Correct.

Python

if result = 16

if result == 16

Use ==.

MATLAB

const a;

const a = 25;

Initialize const.

JavaScript

cin >> index cout << index;

cin >> index; cout << index;

Add semicolon.

C++

$bar = 42; if ($bar = 42) {{}}

$bar = 42; if ($bar == 42) {{}}

Use ==.

PHP

values(90)

if length(values) >= 90, values(90), end

Check length.

MATLAB

let x: Int = 'hello'

let x: String = 'hello'

Fix type.

Swift

const http = require('http'); http.createServer((req,res) => res.end('test')).listen(36);

Correct.

Node.js

function bar(): void {{ return 20; }}

function bar(): number {{ return 20; }}

Return type mismatch.

TypeScript

function render() {{ echo 'test'; }}

Correct.

PHP

Add alt text.

HTML

let mut y=53; let ref1=&mut y; let r2=&mut y;

let mut y=53; {{ let ref1=&mut y; }} let r2=&mut y;

Only one mutable borrow.

Rust

Colon missing.

Python

if (item = 53) {{}}

if (item == 53) {{}}

Use ==.

Java

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

const obj:Person = {{name:'world', age:92}};

Add missing property.

TypeScript

val result: Int = 'output'

val result: String = 'output'

Fix type.

Kotlin