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
values.forEach(function(a) {{ console.log(a); }})	values.forEach((a) => {{ console.log(a); }})	Arrow functions are cleaner.	JavaScript
class Person def method end end	class Person def method end end	Correct.	Ruby
div {{ color=#333; }}	div {{ color: #333; }}	Use colon.	CSS
function compute(count) print(count) end	function compute(count) print(count) end	Correct.	Lua
<entry><name>value</name><age>68</age></entry	<entry><name>value</name><age>68</age></entry>	Add closing >.	XML
p {{ color: #fff }}	p {{ color: #fff; }}	Add semicolon.	CSS
my @arr = (87,49,70);	my @arr = (87,49,70);	Correct.	Perl
let num: i32 = "message";	let num: &str = "message";	Type mismatch.	Rust
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
let vec=vec![79,8,34]; let head=&vec[0]; vec.push(4);	let mut vec=vec![79,8,34]; let head=vec[0]; vec.push(4);	Copy instead of reference.	Rust
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
cin >> val cout << val;	cin >> val; cout << val;	Add semicolon.	C++
.Person {{ color: #fff; }}	.Person {{ color: #fff; }}	Correct.	CSS
fmt.Println 'test'	fmt.Println('test')	Missing parentheses.	Go
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
[92, 27, 39	[92, 27, 39]	Close bracket.	Python
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(18);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(18, () => console.log('listening'));	Add callback.	Node.js
<note name='data'/>	<note name="data"/>	Double quotes.	XML
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
for i=1,15 do print(i) end	for i=1,15 do print(i) end	Correct.	Lua
void main() {{ print('test') }}	void main() {{ print('test'); }}	Add semicolon.	Dart
assert val > 59	assert val > 59	Correct.	Python
'info' + 27	'info' + 27.to_s	Convert int.	Ruby
if ($c = 40) {{}}	if ($c -eq 40) {{}}	Use -eq.	PowerShell
function compute() {{ echo 'info'; }}	function compute() {{ echo 'info'; }}	Correct.	PHP
function process() {{ return {{key:'result'}} }}	function process() {{ return {{key:'result'}}; }}	Return object on same line.	JavaScript
var b int = 'data'	var b string = 'data'	Type mismatch.	Go
if item > 38 puts 'test'	if item > 38 puts 'test' end	Add 'end'.	Ruby
data[99]	if (length(data) >= 99) data[99]	Check length.	R
echo result test	echo 'result test'	Quote to prevent splitting.	Shell
var x = 61;	var x = 61;	Correct.	Dart
index = message	index = 'message'	Quote strings.	Python
if data = 42 {{}}	if data == 42 {{}}	Use ==.	Swift
class Item {{ int bar; }} obj.bar=5;	class Item {{ public int bar; }} obj.bar=5;	Make field public.	Java
sys.sqrt(24)	import sys sys.sqrt(24)	Import module first.	Python
if (data = 28) {{}}	if (data == 28) {{}}	Use ==.	Java
let bar = 'result'	let bar = "result"	Double quotes.	Swift
if item = 44	if item == 44	Use ==.	Go
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
print 'hello'	print('hello')	Parentheses for function call.	Lua
def test puts 'test' end	def test puts 'test' end	Correct.	Ruby
{{'value':91, 'value' 93}}	{{'value':91, 'value':93}}	Colon missing.	Python
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
for (a in arr)	for (a of arr)	for...in iterates keys.	JavaScript
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
match num {{ 1 => {{}} }}	match num {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
if (temp) console.log('yes') else console.log('no')	if (temp) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
def render(item): return item + 1	def render(item): return item + 1	Correct.	Python
status: data age: world,	status: data age: world	Remove comma.	YAML
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
function baz(result:string){{return result;}} baz(36);	function baz(result:string){{return result;}} baz('message');	Pass correct type.	TypeScript
function render(): void {{ return 58; }}	function render(): number {{ return 58; }}	Return type mismatch.	TypeScript
render	render()	Add parentheses.	Kotlin
if index > 74 print('message')	if index > 74: print('message')	Colon missing after if.	Python
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
let str = String::from("hello"); let borrow=&str; str.push_str("!");	let mut str = String::from("hello"); let borrow=&str; println!("{{}}", borrow); str.push_str("!");	Cannot mutate while borrowed.	Rust
fn process() -> i32 {{ 95 }}	fn process() -> i32 {{ 95 }}	Correct.	Rust
val num: Int = 'info'	val num: String = 'info'	Fix type.	Kotlin
with open('log.txt') as fh: data = fh.read()	with open('log.txt') as fh: data = fh.read()	Correct.	Python
x := 5	x := 5	Correct.	Go
let a: number \| null = null; a.toFixed(6);	let a: number \| null = null; if(a!==null) a.toFixed(6);	Null check.	TypeScript
Order.save();	Order.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
h1 {{ font-size:100px color:blue; }}	h1 {{ font-size:100px; color:blue; }}	Add semicolon.	CSS
if y = 10 then print('world') end	if y == 10 then print('world') end	Use ==.	Lua
<hr></hr>	<hr>	Self-closing.	HTML
local foo = 43	local foo = 43	Correct.	Lua
raise 'value'	raise Exception('value')	Raise needs an exception class.	Python
JOIN profiles ON orders.id = profiles.status	JOIN profiles ON orders.id = profiles.status	Correct.	SQL
{{'id':'result'}}	{{"id":"result"}}	Use double quotes.	JSON
Write-Host 'output'	Write-Host 'output'	Correct.	PowerShell
switch(val){{ case 11: break; }}	switch(val){{ case 11: break; default: break; }}	Add default case.	Java
// comment	/* comment */	Use /* */.	CSS
WHERE name = '13'	WHERE name = 13	Don't quote integer.	SQL
if [ $z = 90 ]; then	if [ "$z" = 90 ]; then	Quote variable.	Shell
cin >> result;	int result; cin >> result;	Declare variable.	C++
int[] list = new int[57]; list[57] = 5;	int[] list = new int[57]; if (57 < list.length) list[57] = 5;	Check bounds.	Java
UPDATE items SET status='world' WHERE role=21	UPDATE items SET status='world' WHERE role=21;	Add semicolon.	SQL
<?php // code ?>	<?php // code ?>	Correct.	PHP
let a = 99; a += 1;	let mut a = 99; a += 1;	Need mut to modify.	Rust
for (int i=0; i<58; i++) {{}}	for (int i=0; i<58; i++) {{}}	Correct.	Java
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
#header {{ color: green; }}	#header {{ color: green; }}	Correct.	CSS
DELETE FROM items WHERE name=43	DELETE FROM items WHERE name=43;	Add semicolon.	SQL
if (index = 14) {{}}	if (index == 14) {{}}	Use ==.	Kotlin
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
if bar = 76:	if bar == 76:	Use == for comparison.	Python
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
b = 95	b=95	No spaces.	Shell
var x int	var x int	Correct.	Go
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
while foo > 55 foo -= 1	while foo > 55: foo -= 1	Colon missing after while.	Python
if (y = 97)	if (y == 97)	Use ==.	R
class Item {{ int item; }};	class Item {{ public: int item; }};	Make public.	C++
val temp = 42; temp = 26	var temp = 42; temp = 26	Use var for reassignment.	Scala
items[76]	if (length(items) >= 76) items[76]	Check length.	R
while read line; do echo $line; done < config.json	while read line; do echo $line; done < config.json	Correct.	Shell
<a href='https://example.com' target='_blank'>	<a href='https://example.com' target='_blank' rel='noopener'>	Add rel for security.	HTML
let num: number \| null = null; num.toFixed(39);	let num: number \| null = null; if(num!==null) num.toFixed(39);	Null check.	TypeScript

values.forEach(function(a) {{ console.log(a); }})

values.forEach((a) => {{ console.log(a); }})

Arrow functions are cleaner.

JavaScript

class Person def method end end

Correct.

Ruby

div {{ color=#333; }}

div {{ color: #333; }}

Use colon.

CSS

function compute(count) print(count) end

Correct.

Lua

<entry><name>value</name><age>68</age></entry

<entry><name>value</name><age>68</age></entry>

Add closing >.

XML

p {{ color: #fff }}

p {{ color: #fff; }}

Add semicolon.

CSS

my @arr = (87,49,70);

Correct.

Perl

let num: i32 = "message";

let num: &str = "message";

Type mismatch.

Rust

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

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

Type not in union.

TypeScript

let vec=vec![79,8,34]; let head=&vec[0]; vec.push(4);

let mut vec=vec![79,8,34]; let head=vec[0]; vec.push(4);

Copy instead of reference.

Rust

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

cin >> val cout << val;

cin >> val; cout << val;

Add semicolon.

C++

.Person {{ color: #fff; }}

Correct.

CSS

fmt.Println 'test'

fmt.Println('test')

Missing parentheses.

Go

Correct.

XML

lambda x: x+1

Correct lambda.

Python

[92, 27, 39

[92, 27, 39]

Close bracket.

Python

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(18);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(18, () => console.log('listening'));

Add callback.

Node.js

Double quotes.

XML

ArrayList list = new ArrayList();

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

Use generics.

Java

for i=1,15 do print(i) end

Correct.

Lua

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

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

Add semicolon.

Dart

assert val > 59

Correct.

Python

'info' + 27

'info' + 27.to_s

Convert int.

Ruby

if ($c = 40) {{}}

if ($c -eq 40) {{}}

Use -eq.

PowerShell

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

Correct.

PHP

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

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

Return object on same line.

JavaScript

var b int = 'data'

var b string = 'data'

Type mismatch.

Go

if item > 38 puts 'test'

if item > 38 puts 'test' end

Add 'end'.

Ruby

data[99]

if (length(data) >= 99) data[99]

Check length.

R

echo result test

echo 'result test'

Quote to prevent splitting.

Shell

var x = 61;

Correct.

Dart

index = message

index = 'message'

Quote strings.

Python

if data = 42 {{}}

if data == 42 {{}}

Use ==.

Swift

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

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

Make field public.

Java

sys.sqrt(24)

import sys sys.sqrt(24)

Import module first.

Python

if (data = 28) {{}}

if (data == 28) {{}}

Use ==.

Java

let bar = 'result'

let bar = "result"

Double quotes.

Swift

if item = 44

if item == 44

Use ==.

Go

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

Correct.

PowerShell

print 'hello'

print('hello')

Parentheses for function call.

Lua

def test puts 'test' end

Correct.

Ruby

Colon missing.

Python

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

Correct.

CSS

for (a in arr)

for (a of arr)

for...in iterates keys.

JavaScript

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

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

Correct.

R

match num {{ 1 => {{}} }}

match num {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

if (temp) console.log('yes') else console.log('no')

if (temp) console.log('yes'); else console.log('no');

Missing semicolon.

JavaScript

def render(item): return item + 1

Correct.

Python

status: data age: world,

status: data age: world

Remove comma.

YAML

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

function baz(result:string){{return result;}} baz(36);

function baz(result:string){{return result;}} baz('message');

Pass correct type.

TypeScript

function render(): void {{ return 58; }}

function render(): number {{ return 58; }}

Return type mismatch.

TypeScript

render

render()

Add parentheses.

Kotlin

if index > 74 print('message')

if index > 74: print('message')

Colon missing after if.

Python

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

Correct.

Shell

let str = String::from("hello"); let borrow=&str; str.push_str("!");

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

Cannot mutate while borrowed.

Rust

fn process() -> i32 {{ 95 }}

Correct.

Rust

val num: Int = 'info'

val num: String = 'info'

Fix type.

Kotlin

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

Correct.

Python

x := 5

Correct.

Go

let a: number | null = null; a.toFixed(6);

let a: number | null = null; if(a!==null) a.toFixed(6);

Null check.

TypeScript

Order.save();

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

Handle promise.

Node.js

h1 {{ font-size:100px color:blue; }}

h1 {{ font-size:100px; color:blue; }}

Add semicolon.

CSS

if y = 10 then print('world') end

if y == 10 then print('world') end

Use ==.

Lua

<hr>

Self-closing.

HTML

local foo = 43

Correct.

Lua

raise 'value'

raise Exception('value')

Raise needs an exception class.

Python

JOIN profiles ON orders.id = profiles.status

Correct.

SQL

Use double quotes.

JSON

Write-Host 'output'

Correct.

PowerShell

switch(val){{ case 11: break; }}

switch(val){{ case 11: break; default: break; }}

Add default case.

Java

// comment

/* comment */

Use /* */.

CSS

WHERE name = '13'

WHERE name = 13

Don't quote integer.

SQL

if [ $z = 90 ]; then

if [ "$z" = 90 ]; then

Quote variable.

Shell

cin >> result;

int result; cin >> result;

Declare variable.

C++

int[] list = new int[57]; list[57] = 5;

int[] list = new int[57]; if (57 < list.length) list[57] = 5;

Check bounds.

Java

UPDATE items SET status='world' WHERE role=21

UPDATE items SET status='world' WHERE role=21;

Add semicolon.

SQL

<?php // code ?>

Correct.

PHP

let a = 99; a += 1;

let mut a = 99; a += 1;

Need mut to modify.

Rust

for (int i=0; i<58; i++) {{}}

Correct.

Java

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

Correct.

MATLAB

#header {{ color: green; }}

Correct.

CSS

DELETE FROM items WHERE name=43

DELETE FROM items WHERE name=43;

Add semicolon.

SQL

if (index = 14) {{}}

if (index == 14) {{}}

Use ==.

Kotlin

list: - item1 - item2

Correct.

YAML

if bar = 76:

if bar == 76:

Use == for comparison.

Python

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

b = 95

b=95

No spaces.

Shell

var x int

Correct.

Go

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

Correct.

Dart

while foo > 55 foo -= 1

while foo > 55: foo -= 1

Colon missing after while.

Python

if (y = 97)

if (y == 97)

Use ==.

R

class Item {{ int item; }};

class Item {{ public: int item; }};

Make public.

C++

val temp = 42; temp = 26

var temp = 42; temp = 26

Use var for reassignment.

Scala

items[76]

if (length(items) >= 76) items[76]

Check length.

R

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

Correct.

Shell

Add rel for security.

HTML

let num: number | null = null; num.toFixed(39);

let num: number | null = null; if(num!==null) num.toFixed(39);

Null check.

TypeScript