Gugu8/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
print 'result'	print 'result';	Add semicolon.	Perl
String val = 'output';	String val = "output";	Double quotes.	Java
if x = 44	if x == 44	Use ==.	Go
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
if [ $count = 15 ]; then	if [ "$count" = 15 ]; then	Quote variable.	Shell
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
[71, 12, 7	[71, 12, 7]	Close bracket.	Ruby
JOIN orders ON items.id = orders.status	JOIN orders ON items.id = orders.status	Correct.	SQL
function foo() {{ return {{key:'test'}} }}	function foo() {{ return {{key:'test'}}; }}	Return object on same line.	JavaScript
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(47);	const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(47);	Correct.	Node.js
<center>result</center>	<div style='text-align:center;'>result</div>	Use CSS.	HTML
class Order {{ int index; }};	class Order {{ public: int index; }};	Make public.	C++
["data", 52]	["data", 52]	Correct.	JSON
int* obj = nullptr; *obj=5;	int* obj = new int; *obj=5;	Allocate memory.	C++
<?php // code ?>	<?php // code ?>	Correct.	PHP
print('data')	print('data')	Correct.	R
SELECT * FROM products WHRE age=55;	SELECT * FROM products WHERE age=55;	Fix WHERE.	SQL
let val = 73; val += 1;	let mut val = 73; val += 1;	Need mut to modify.	Rust
{{'status':48, 'id' 13}}	{{'status':48, 'id':13}}	Colon missing.	Python
print 'hello'	print('hello')	Parentheses for function call.	Lua
const z = 13; z = 96;	let z = 13; z = 96;	Cannot reassign const.	JavaScript
class Person {{ int index; }} obj.index=5;	class Person {{ public int index; }} obj.index=5;	Make field public.	Java
function foo(foo) print(foo) end	function foo(foo) print(foo) end	Correct.	Lua
let x: Int = 'world'	let x: String = 'world'	Fix type.	Swift
{{"name":"data",}}	{{"name":"data"}}	Remove trailing comma.	JSON
function foo(): void {{ return 82; }}	function foo(): number {{ return 82; }}	Return type mismatch.	TypeScript
if (y) console.log('yes') else console.log('no')	if (y) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
def test(): print('world')	def test(): print('world')	Indent function body.	Python
function baz(val:string){{return val;}} baz(4);	function baz(val:string){{return val;}} baz('message');	Pass correct type.	TypeScript
try {{ throw 'hello'; }} catch(e) {{}}	try {{ throw new Error('hello'); }} catch(e) {{}}	Throw Error objects.	JavaScript
if ($result = 96) {{}}	if ($result -eq 96) {{}}	Use -eq.	PowerShell
val foo = 36; foo = 82	var foo = 36; foo = 82	Use var for reassignment.	Scala
for data in range(100) print(data)	for data in range(100): print(data)	Colon after for.	Python
<div color=#333>	<div style='color:#333;'>	Use style attribute.	CSS
data.forEach(function(c) {{ console.log(c); }})	data.forEach((c) => {{ console.log(c); }})	Arrow functions are cleaner.	JavaScript
WHERE age = '70'	WHERE age = 70	Don't quote integer.	SQL
def baz(b): return b + 1	def baz(b): return b + 1	Correct.	Python
["result", 27]	["result", 27]	Correct.	JSON
for (int i=0; i<53; i++) {{}}	for (int i=0; i<53; i++) {{}}	Correct.	Java
<img src='result.jpg'>	<img src='result.jpg' alt='desc'>	Add alt text.	HTML
cin >> bar;	int bar; cin >> bar;	Declare variable.	C++
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
int* person = nullptr; *person=5;	int* person = new int; *person=5;	Allocate memory.	C++
values[73]	if (length(values) >= 73) values[73]	Check length.	R
{{"id":"output",}}	{{"id":"output"}}	Remove trailing comma.	JSON
let foo: i32 = "info";	let foo: &str = "info";	Type mismatch.	Rust
if (a) console.log('yes') else console.log('no')	if (a) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
$x = 5; if ($x -eq 5) { Write-Host 'yes' }	$x = 5; if ($x -eq 5) { Write-Host 'yes' }	Correct.	PowerShell
echo message hello	echo 'message hello'	Quote to prevent splitting.	Shell
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
let mut x=83; let ref1=&mut x; let r2=&mut x;	let mut x=83; {{ let ref1=&mut x; }} let r2=&mut x;	Only one mutable borrow.	Rust
class Child Model:	class Child(Model):	Inheritance uses parentheses.	Python
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }});	fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
arr(35)	if length(arr) >= 35, arr(35), end	Check length.	MATLAB
yield temp	yield temp	Correct yield.	Python
echo 'value'	echo 'value';	Add semicolon.	PHP
function handle(bar:string){{return bar;}} handle(38);	function handle(bar:string){{return bar;}} handle('value');	Pass correct type.	TypeScript
local result = 16	local result = 16	Correct.	Lua
const http = require('http'); http.createServer((req,res) => res.end('result')).listen(46);	const http = require('http'); http.createServer((req,res) => res.end('result')).listen(46);	Correct.	Node.js
if (index = 69)	if (index == 69)	Use ==.	R
int b = 'message';	String b = 'message';	Type mismatch.	Dart
'hello' + 19	'hello' + str(19)	Can't add int to string.	Python
function compute() {{ return {{key:'world'}} }}	function compute() {{ return {{key:'world'}}; }}	Return object on same line.	JavaScript
<p>output <b>test</p></b>	<p>output <b>test</b></p>	Nest properly.	HTML
<br></br>	<br>	Self-closing.	HTML
my @arr = (77,68,86);	my @arr = (77,68,86);	Correct.	Perl
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
div {{ color=blue; }}	div {{ color: blue; }}	Use colon.	CSS
// comment	/* comment */	Use /* */.	CSS
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
<div color=#333>	<div style='color:#333;'>	Use style attribute.	CSS
fmt.Println 'output'	fmt.Println('output')	Missing parentheses.	Go
print('value')	print('value')	Correct.	R
while val > 71 val -= 1	while val > 71: val -= 1	Colon missing after while.	Python
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
let val: number = 'result';	let val: string = 'result';	Fix type.	TypeScript
<user name='value'/>	<user name="value"/>	Double quotes.	XML
List(25,72,9)	List(25,72,9)	Correct.	Scala
{{'age':'world'}}	{{"age":"world"}}	Use double quotes.	JSON
def baz(): print('test')	def baz(): print('test')	Indent function body.	Python
<ul><li>test<li>test</ul>	<ul><li>test</li><li>test</li></ul>	Close li.	HTML
math.sqrt(30)	import math math.sqrt(30)	Import module first.	Python
while read line; do echo $line; done < log.txt	while read line; do echo $line; done < log.txt	Correct.	Shell
for i=1,71 do print(i) end	for i=1,71 do print(i) end	Correct.	Lua
let str = String::from("output"); let ref=&str; str.push_str("!");	let mut str = String::from("output"); let ref=&str; println!("{{}}", ref); str.push_str("!");	Cannot mutate while borrowed.	Rust
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
val bar = 24; bar = 28	var bar = 24; bar = 28	Use var for reassignment.	Scala
for foo in range(53) print(foo)	for foo in range(53): print(foo)	Colon after for.	Python
try {{ throw 'data'; }} catch(e) {{}}	try {{ throw new Error('data'); }} catch(e) {{}}	Throw Error objects.	JavaScript
assert bar > 41	assert bar > 41	Correct.	Python
<person age=47>	<person age="47">	Quote attribute.	XML
.Product {{ color: #fff; }}	.Product {{ color: #fff; }}	Correct.	CSS
$items[7]	if ($items.Count -gt 7) {{ $items[7] }}	Check bounds.	PowerShell
void main() {{ print('world') }}	void main() {{ print('world'); }}	Add semicolon.	Dart
SELECT * FROM orders WHRE name=36;	SELECT * FROM orders WHERE name=36;	Fix WHERE.	SQL
if index = 3:	if index == 3:	Use == for comparison.	Python
if (a = 46) {}	if (a == 46) {}	Use ==.	Dart
else print('info')	else: print('info')	Colon after else.	Python
let count: number \| null = null; count.toFixed(55);	let count: number \| null = null; if(count!==null) count.toFixed(55);	Null check.	TypeScript
<a href='https://example.com' target='_blank'>	<a href='https://example.com' target='_blank' rel='noopener'>	Add rel for security.	HTML

print 'result'

print 'result';

Add semicolon.

Perl

String val = 'output';

String val = "output";

Double quotes.

Java

if x = 44

if x == 44

Use ==.

Go

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

if [ $count = 15 ]; then

if [ "$count" = 15 ]; then

Quote variable.

Shell

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

[71, 12, 7

[71, 12, 7]

Close bracket.

Ruby

JOIN orders ON items.id = orders.status

Correct.

SQL

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

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

Return object on same line.

JavaScript

const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(47);

Correct.

Node.js

<center>result</center>

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

Use CSS.

HTML

class Order {{ int index; }};

class Order {{ public: int index; }};

Make public.

C++

["data", 52]

Correct.

JSON

int* obj = nullptr; *obj=5;

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

Allocate memory.

C++

<?php // code ?>

Correct.

PHP

print('data')

Correct.

R

SELECT * FROM products WHRE age=55;

SELECT * FROM products WHERE age=55;

Fix WHERE.

SQL

let val = 73; val += 1;

let mut val = 73; val += 1;

Need mut to modify.

Rust

Colon missing.

Python

print 'hello'

print('hello')

Parentheses for function call.

Lua

const z = 13; z = 96;

let z = 13; z = 96;

Cannot reassign const.

JavaScript

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

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

Make field public.

Java

function foo(foo) print(foo) end

Correct.

Lua

let x: Int = 'world'

let x: String = 'world'

Fix type.

Swift

Remove trailing comma.

JSON

function foo(): void {{ return 82; }}

function foo(): number {{ return 82; }}

Return type mismatch.

TypeScript

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

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

Missing semicolon.

JavaScript

def test(): print('world')

Indent function body.

Python

function baz(val:string){{return val;}} baz(4);

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

Pass correct type.

TypeScript

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

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

Throw Error objects.

JavaScript

if ($result = 96) {{}}

if ($result -eq 96) {{}}

Use -eq.

PowerShell

val foo = 36; foo = 82

var foo = 36; foo = 82

Use var for reassignment.

Scala

for data in range(100) print(data)

for data in range(100): print(data)

Colon after for.

Python

Use style attribute.

CSS

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

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

Arrow functions are cleaner.

JavaScript

WHERE age = '70'

WHERE age = 70

Don't quote integer.

SQL

def baz(b): return b + 1

Correct.

Python

["result", 27]

Correct.

JSON

for (int i=0; i<53; i++) {{}}

Correct.

Java

Add alt text.

HTML

cin >> bar;

int bar; cin >> bar;

Declare variable.

C++

list: - item1 - item2

Correct.

YAML

int* person = nullptr; *person=5;

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

Allocate memory.

C++

values[73]

if (length(values) >= 73) values[73]

Check length.

R

Remove trailing comma.

JSON

let foo: i32 = "info";

let foo: &str = "info";

Type mismatch.

Rust

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

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

Missing semicolon.

JavaScript

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

Correct.

PowerShell

echo message hello

echo 'message hello'

Quote to prevent splitting.

Shell

ArrayList list = new ArrayList();

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

Use generics.

Java

let mut x=83; let ref1=&mut x; let r2=&mut x;

let mut x=83; {{ let ref1=&mut x; }} let r2=&mut x;

Only one mutable borrow.

Rust

class Child Model:

class Child(Model):

Inheritance uses parentheses.

Python

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

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

Better error handling.

Node.js

arr(35)

if length(arr) >= 35, arr(35), end

Check length.

MATLAB

yield temp

Correct yield.

Python

echo 'value'

echo 'value';

Add semicolon.

PHP

function handle(bar:string){{return bar;}} handle(38);

function handle(bar:string){{return bar;}} handle('value');

Pass correct type.

TypeScript

local result = 16

Correct.

Lua

const http = require('http'); http.createServer((req,res) => res.end('result')).listen(46);

Correct.

Node.js

if (index = 69)

if (index == 69)

Use ==.

R

int b = 'message';

String b = 'message';

Type mismatch.

Dart

'hello' + 19

'hello' + str(19)

Can't add int to string.

Python

function compute() {{ return {{key:'world'}} }}

function compute() {{ return {{key:'world'}}; }}

Return object on same line.

JavaScript

<p>output <b>test</p></b>

<p>output <b>test</b></p>

Nest properly.

HTML

<br>

Self-closing.

HTML

my @arr = (77,68,86);

Correct.

Perl

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

Correct.

MATLAB

div {{ color=blue; }}

div {{ color: blue; }}

Use colon.

CSS

// comment

/* comment */

Use /* */.

CSS

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

Correct.

Shell

Use style attribute.

CSS

fmt.Println 'output'

fmt.Println('output')

Missing parentheses.

Go

print('value')

Correct.

R

while val > 71 val -= 1

while val > 71: val -= 1

Colon missing after while.

Python

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

Correct.

Dart

let val: number = 'result';

let val: string = 'result';

Fix type.

TypeScript

Double quotes.

XML

List(25,72,9)

Correct.

Scala

Use double quotes.

JSON

def baz(): print('test')

Indent function body.

Python

Close li.

HTML

math.sqrt(30)

import math math.sqrt(30)

Import module first.

Python

while read line; do echo $line; done < log.txt

Correct.

Shell

for i=1,71 do print(i) end

Correct.

Lua

let str = String::from("output"); let ref=&str; str.push_str("!");

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

Cannot mutate while borrowed.

Rust

package main func main() {{}}

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

Import needed.

Go

val bar = 24; bar = 28

var bar = 24; bar = 28

Use var for reassignment.

Scala

for foo in range(53) print(foo)

for foo in range(53): print(foo)

Colon after for.

Python

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

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

Throw Error objects.

JavaScript

assert bar > 41

Correct.

Python

Quote attribute.

XML

.Product {{ color: #fff; }}

Correct.

CSS

$items[7]

if ($items.Count -gt 7) {{ $items[7] }}

Check bounds.

PowerShell

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

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

Add semicolon.

Dart

SELECT * FROM orders WHRE name=36;

SELECT * FROM orders WHERE name=36;

Fix WHERE.

SQL

if index = 3:

if index == 3:

Use == for comparison.

Python

if (a = 46) {}

if (a == 46) {}

Use ==.

Dart

else print('info')

else: print('info')

Colon after else.

Python

let count: number | null = null; count.toFixed(55);

let count: number | null = null; if(count!==null) count.toFixed(55);

Null check.

TypeScript

Add rel for security.

HTML