Corpus-NZ/Code-Syntax-Expanded · Datasets at Hugging Face

wrong_code stringlengths 3 123	correct_code stringlengths 3 155	explanation stringclasses 101 values	language stringclasses 26 values
echo 'hello'	echo 'hello';	Add semicolon.	PHP
$values[81] = 5;	if (isset($values[81])) $values[81] = 5;	Check existence.	PHP
<br></br>	<br>	Self-closing.	HTML
int[] values = new int[90]; values[90] = 5;	int[] values = new int[90]; if (90 < values.length) values[90] = 5;	Check bounds.	Java
assert item > 15	assert item > 15	Correct.	Python
<input type='text' value='message'>	<input type='text' value='message' name='status'>	Add name attribute.	HTML
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
for a in range(13) print(a)	for a in range(13): print(a)	Colon after for.	Python
while read line; do echo $line; done < config.json	while read line; do echo $line; done < config.json	Correct.	Shell
System.out.println('data')	System.out.println('data');	Add semicolon.	Java
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
let val: number = 'world';	let val: string = 'world';	Fix type.	TypeScript
p {{ color: red }}	p {{ color: red; }}	Add semicolon.	CSS
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
'message' + 90	'message' + str(90)	Can't add int to string.	Python
local num = 44	local num = 44	Correct.	Lua
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
function baz() {{ return {{key:'output'}} }}	function baz() {{ return {{key:'output'}}; }}	Return object on same line.	JavaScript
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
h1 {{ font-size:81px color:green; }}	h1 {{ font-size:81px; color:green; }}	Add semicolon.	CSS
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
print('value')	print('value')	Correct.	R
String c = 'world';	String c = "world";	Double quotes.	Java
disp('world')	disp('world')	Correct.	MATLAB
fmt.Println 'data'	fmt.Println('data')	Missing parentheses.	Go
let msg = String::from("message"); let borrow=&msg; msg.push_str("!");	let mut msg = String::from("message"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!");	Cannot mutate while borrowed.	Rust
match count {{ 1 => {{}} }}	match count {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
random.sqrt(21)	import random random.sqrt(21)	Import module first.	Python
div {{ color=green; }}	div {{ color: green; }}	Use colon.	CSS
function handle() {{ echo 'output'; }}	function handle() {{ echo 'output'; }}	Correct.	PHP
value: info id: test,	value: info id: test	Remove comma.	YAML
function bar(z) print(z) end	function bar(z) print(z) end	Correct.	Lua
function render(): void {{ return 83; }}	function render(): number {{ return 83; }}	Return type mismatch.	TypeScript
JOIN products ON products.id = products.status	JOIN products ON products.id = products.status	Correct.	SQL
var bar int = 'test'	var bar string = 'test'	Type mismatch.	Go
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(94);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(94, () => console.log('listening'));	Add callback.	Node.js
$data[3]	if ($data.Count -gt 3) {{ $data[3] }}	Check bounds.	PowerShell
if (count = 29) {{}}	if (count == 29) {{}}	Use ==.	Java
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
DELETE FROM orders WHERE email=64	DELETE FROM orders WHERE email=64;	Add semicolon.	SQL
if (result = 7)	if (result == 7)	Use ==.	Scala
'value' + 1	'value' + 1.to_s	Convert int.	Ruby
<note name='output'/>	<note name="output"/>	Double quotes.	XML
const result;	const result = 62;	Initialize const.	JavaScript
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
List(25,5,9)	List(25,5,9)	Correct.	Scala
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(31);	const http = require('http'); http.createServer((req,res) => res.end('data')).listen(31);	Correct.	Node.js
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
my @arr = (68,59,62);	my @arr = (68,59,62);	Correct.	Perl
Write-Host 'message'	Write-Host 'message'	Correct.	PowerShell
["message", 71]	["message", 71]	Correct.	JSON
yield val	yield val	Correct yield.	Python
<person><name>message</name><desc>45</desc></person	<person><name>message</name><desc>45</desc></person>	Add closing >.	XML
if val = 74	if val == 74	Use ==.	MATLAB
<table><tr><td>world<td>data</tr></table>	<table><tr><td>world</td><td>data</td></tr></table>	Close td.	HTML
if c > 64 puts 'result'	if c > 64 puts 'result' end	Add 'end'.	Ruby
WHERE age = '10'	WHERE age = 10	Don't quote integer.	SQL
if (result) console.log('yes') else console.log('no')	if (result) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
int b = 'data';	String b = 'data';	Type mismatch.	Dart
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
print 'output'	print 'output';	Add semicolon.	Perl
let x: i32 = "test";	let x: &str = "test";	Type mismatch.	Rust
if (c = 61) {}	if (c == 61) {}	Use ==.	Dart
def foo(): print('result')	def foo(): print('result')	Indent function body.	Python
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
let str1 = String::from("message"); let text2 = str1; println!("{{}}", str1);	let str1 = String::from("message"); let text2 = str1.clone(); println!("{{}}", str1);	Clone to avoid move.	Rust
if [ $z = 97 ]; then	if [ "$z" = 97 ]; then	Quote variable.	Shell
<p>world <b>world</p></b>	<p>world <b>world</b></p>	Nest properly.	HTML
arr[72]	if (arr.indices.contains(72)) arr[72]	Check index.	Kotlin
int* user = nullptr; *user=5;	int* user = new int; *user=5;	Allocate memory.	C++
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
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
<div color=green>	<div style='color:green;'>	Use style attribute.	CSS
void main() {{ print('result') }}	void main() {{ print('result'); }}	Add semicolon.	Dart
let foo: number \| null = null; foo.toFixed(60);	let foo: number \| null = null; if(foo!==null) foo.toFixed(60);	Null check.	TypeScript
$c = 94; if ($c = 94) {{}}	$c = 94; if ($c == 94) {{}}	Use ==.	PHP
if ($index = 64) {{}}	if ($index -eq 64) {{}}	Use -eq.	PowerShell
var x int	var x int	Correct.	Go
class Person {{ int result; }} obj.result=5;	class Person {{ public int result; }} obj.result=5;	Make field public.	Java
handle	handle()	Add parentheses.	Kotlin
if count = 80	if count == 80	Use ==.	Ruby
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
{{'value':17, 'status' 28}}	{{'value':17, 'status':28}}	Colon missing.	Python
function compute(result:string){{return result;}} compute(36);	function compute(result:string){{return result;}} compute('world');	Pass correct type.	TypeScript
for (int i=0; i<52; i++) {{}}	for (int i=0; i<52; i++) {{}}	Correct.	Java
process	process()	Add parentheses.	Swift
print 'test'	print('test')	print needs parentheses.	Python
switch(index){{ case 93: break; }}	switch(index){{ case 93: break; default: break; }}	Add default case.	Java
for (z in arr)	for (z of arr)	for...in iterates keys.	JavaScript
def baz puts 'world' end	def baz puts 'world' end	Correct.	Ruby
cin >> val;	int val; cin >> val;	Declare variable.	C++
{{"id":"value" "age":83}}	{{"id":"value", "age":83}}	Add comma.	JSON
x > 87 & y < 44	x > 87 and y < 44	Use 'and' not '&'.	Python
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
items[71]	if (length(items) >= 71) items[71]	Check length.	R
for i=1,7 do print(i) end	for i=1,7 do print(i) end	Correct.	Lua
.Order {{ color: blue; }}	.Order {{ color: blue; }}	Correct.	CSS
String name = 'value';	String name = 'value';	Correct.	Dart

echo 'hello'

echo 'hello';

Add semicolon.

PHP

$values[81] = 5;

if (isset($values[81])) $values[81] = 5;

Check existence.

PHP

<br>

Self-closing.

HTML

int[] values = new int[90]; values[90] = 5;

int[] values = new int[90]; if (90 < values.length) values[90] = 5;

Check bounds.

Java

assert item > 15

Correct.

Python

Add name attribute.

HTML

package main func main() {{}}

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

Import needed.

Go

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

Correct.

Shell

for a in range(13) print(a)

for a in range(13): print(a)

Colon after for.

Python

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

Correct.

Shell

System.out.println('data')

System.out.println('data');

Add semicolon.

Java

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

Correct.

MATLAB

let val: number = 'world';

let val: string = 'world';

Fix type.

TypeScript

p {{ color: red }}

p {{ color: red; }}

Add semicolon.

CSS

ArrayList list = new ArrayList();

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

Use generics.

Java

'message' + 90

'message' + str(90)

Can't add int to string.

Python

local num = 44

Correct.

Lua

lambda x: x+1

Correct lambda.

Python

function baz() {{ return {{key:'output'}} }}

function baz() {{ return {{key:'output'}}; }}

Return object on same line.

JavaScript

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

Correct.

CSS

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

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

Add semicolon.

CSS

int main() {{ return 0; }}

Correct.

C++

print('value')

Correct.

R

String c = 'world';

String c = "world";

Double quotes.

Java

disp('world')

Correct.

MATLAB

fmt.Println 'data'

fmt.Println('data')

Missing parentheses.

Go

let msg = String::from("message"); let borrow=&msg; msg.push_str("!");

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

Cannot mutate while borrowed.

Rust

match count {{ 1 => {{}} }}

match count {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

random.sqrt(21)

import random random.sqrt(21)

Import module first.

Python

div {{ color=green; }}

div {{ color: green; }}

Use colon.

CSS

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

Correct.

PHP

value: info id: test,

value: info id: test

Remove comma.

YAML

function bar(z) print(z) end

Correct.

Lua

function render(): void {{ return 83; }}

function render(): number {{ return 83; }}

Return type mismatch.

TypeScript

JOIN products ON products.id = products.status

Correct.

SQL

var bar int = 'test'

var bar string = 'test'

Type mismatch.

Go

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(94);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(94, () => console.log('listening'));

Add callback.

Node.js

$data[3]

if ($data.Count -gt 3) {{ $data[3] }}

Check bounds.

PowerShell

if (count = 29) {{}}

if (count == 29) {{}}

Use ==.

Java

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

DELETE FROM orders WHERE email=64

DELETE FROM orders WHERE email=64;

Add semicolon.

SQL

if (result = 7)

if (result == 7)

Use ==.

Scala

'value' + 1

'value' + 1.to_s

Convert int.

Ruby

Double quotes.

XML

const result;

const result = 62;

Initialize const.

JavaScript

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

List(25,5,9)

Correct.

Scala

const http = require('http'); http.createServer((req,res) => res.end('data')).listen(31);

Correct.

Node.js

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

Correct.

PowerShell

my @arr = (68,59,62);

Correct.

Perl

Write-Host 'message'

Correct.

PowerShell

["message", 71]

Correct.

JSON

yield val

Correct yield.

Python

<person><name>message</name><desc>45</desc></person

<person><name>message</name><desc>45</desc></person>

Add closing >.

XML

if val = 74

if val == 74

Use ==.

MATLAB

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

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

Close td.

HTML

if c > 64 puts 'result'

if c > 64 puts 'result' end

Add 'end'.

Ruby

WHERE age = '10'

WHERE age = 10

Don't quote integer.

SQL

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

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

Missing semicolon.

JavaScript

int b = 'data';

String b = 'data';

Type mismatch.

Dart

Correct.

XML

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

print 'output'

print 'output';

Add semicolon.

Perl

let x: i32 = "test";

let x: &str = "test";

Type mismatch.

Rust

if (c = 61) {}

if (c == 61) {}

Use ==.

Dart

def foo(): print('result')

Indent function body.

Python

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

Correct.

R

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

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

Clone to avoid move.

Rust

if [ $z = 97 ]; then

if [ "$z" = 97 ]; then

Quote variable.

Shell

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

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

Nest properly.

HTML

arr[72]

if (arr.indices.contains(72)) arr[72]

Check index.

Kotlin

int* user = nullptr; *user=5;

int* user = new int; *user=5;

Allocate memory.

C++

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

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

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

Type not in union.

TypeScript

Use style attribute.

CSS

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

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

Add semicolon.

Dart

let foo: number | null = null; foo.toFixed(60);

let foo: number | null = null; if(foo!==null) foo.toFixed(60);

Null check.

TypeScript

$c = 94; if ($c = 94) {{}}

$c = 94; if ($c == 94) {{}}

Use ==.

PHP

if ($index = 64) {{}}

if ($index -eq 64) {{}}

Use -eq.

PowerShell

var x int

Correct.

Go

class Person {{ int result; }} obj.result=5;

class Person {{ public int result; }} obj.result=5;

Make field public.

Java

handle

handle()

Add parentheses.

Kotlin

if count = 80

if count == 80

Use ==.

Ruby

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

Colon missing.

Python

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

function compute(result:string){{return result;}} compute('world');

Pass correct type.

TypeScript

for (int i=0; i<52; i++) {{}}

Correct.

Java

process

process()

Add parentheses.

Swift

print 'test'

print('test')

print needs parentheses.

Python

switch(index){{ case 93: break; }}

switch(index){{ case 93: break; default: break; }}

Add default case.

Java

for (z in arr)

for (z of arr)

for...in iterates keys.

JavaScript

def baz puts 'world' end

Correct.

Ruby

cin >> val;

int val; cin >> val;

Declare variable.

C++

Add comma.

JSON

x > 87 & y < 44

x > 87 and y < 44

Use 'and' not '&'.

Python

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

items[71]

if (length(items) >= 71) items[71]

Check length.

R

for i=1,7 do print(i) end

Correct.

Lua

.Order {{ color: blue; }}

Correct.

CSS

String name = 'value';

Correct.

Dart