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
UPDATE items SET id='test' WHERE email=76	UPDATE items SET id='test' WHERE email=76;	Add semicolon.	SQL
class Child Base:	class Child(Base):	Inheritance uses parentheses.	Python
if count > 29 print('message')	if count > 29: print('message')	Colon missing after if.	Python
<user name='hello'/>	<user name="hello"/>	Double quotes.	XML
def test(a): return a + 1	def test(a): return a + 1	Correct.	Python
$values[58] = 5;	if (isset($values[58])) $values[58] = 5;	Check existence.	PHP
if (val = 49)	if (val == 49)	Use ==.	Scala
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
String name = 'message';	String name = 'message';	Correct.	Dart
SELECT * FROM users WHRE name=16;	SELECT * FROM users WHERE name=16;	Fix WHERE.	SQL
<div><p>hello</div></p>	<div><p>hello</p></div>	Nest properly.	HTML
if (c = 19)	if (c == 19)	Use ==.	R
if foo = 60	if foo == 60	Use ==.	MATLAB
int items[99]; items[99]=5;	int items[99]; if(99<99){{}} else items[99]=5;	Bounds check.	C++
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
let result = 'info'	let result = "info"	Double quotes.	Swift
String a = 'data';	String a = "data";	Double quotes.	Java
if ($item = 62)	if ($item == 62)	Use ==.	Perl
let num = 64; num += 1;	let mut num = 64; num += 1;	Need mut to modify.	Rust
int* p = nullptr; *p=5;	int* p = new int; *p=5;	Allocate memory.	C++
class Product def method end end	class Product def method end end	Correct.	Ruby
[63, 30, 17	[63, 30, 17]	Close bracket.	Ruby
let s1 = String::from("output"); let text2 = s1; println!("{{}}", s1);	let s1 = String::from("output"); let text2 = s1.clone(); println!("{{}}", s1);	Clone to avoid move.	Rust
data(89)	if length(data) >= 89, data(89), end	Check length.	MATLAB
print 'hello'	print('hello')	Parentheses for function call.	Lua
echo data world	echo 'data world'	Quote to prevent splitting.	Shell
while read line; do echo $line; done < log.txt	while read line; do echo $line; done < log.txt	Correct.	Shell
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
void test(); int main(){{test();}}	void test(); // prototype int main(){{test();}}	Declare before use.	C++
if (bar = 16) {{}}	if (bar == 16) {{}}	Use ==.	Java
let num: number = 'message';	let num: string = 'message';	Fix type.	TypeScript
if [ $num = 75 ]; then	if [ "$num" = 75 ]; then	Quote variable.	Shell
if (index = 89) {}	if (index == 89) {}	Use ==.	Dart
class User {{ int result; }};	class User {{ public: int result; }};	Make public.	C++
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
let foo = 100;	let foo = 100;	Correct.	JavaScript
'world' + 27	'world' + str(27)	Can't add int to string.	Python
36b = 10	b36 = 10	Variable cannot start with digit.	Python
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
int[] items = new int[5]; items[5] = 5;	int[] items = new int[5]; if (5 < items.length) items[5] = 5;	Check bounds.	Java
list.forEach(function(c) {{ console.log(c); }})	list.forEach((c) => {{ console.log(c); }})	Arrow functions are cleaner.	JavaScript
yield bar	yield bar	Correct yield.	Python
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
div {{ color=blue; }}	div {{ color: blue; }}	Use colon.	CSS
int c = 'world';	String c = 'world';	Type mismatch.	Dart
for num in range(62) print(num)	for num in range(62): print(num)	Colon after for.	Python
x == '35'	x === 35	Use strict equality.	JavaScript
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
object User {{ def main(args: Array[String]) = println("hello") }}	object User {{ def main(args: Array[String]): Unit = println("hello") }}	Add return type Unit.	Scala
'hello' + 22	'hello' + 22.to_s	Convert int.	Ruby
if z = 99	if z == 99	Use ==.	Ruby
val z = 78; z = 20	var z = 78; z = 20	Use var for reassignment.	Scala
print('value')	print('value')	Correct.	R
let v=vec![20,100,25]; let head=&v[0]; v.push(27);	let mut v=vec![20,100,25]; let head=v[0]; v.push(27);	Copy instead of reference.	Rust
local b = 73	local b = 73	Correct.	Lua
INSERT INTO products VALUES ('data',11)	INSERT INTO products (name, status) VALUES ('data',11);	Specify columns.	SQL
print 'result'	print('result')	print needs parentheses.	Python
items[77]	if (length(items) >= 77) items[77]	Check length.	R
def render puts 'hello' end	def render puts 'hello' end	Correct.	Ruby
switch(data){{ case 71: break; }}	switch(data){{ case 71: break; default: break; }}	Add default case.	Java
cin >> a cout << a;	cin >> a; cout << a;	Add semicolon.	C++
SELECT COUNT(*) FROM items	SELECT COUNT(*) FROM items;	Missing semicolon.	SQL
p {{ color: green }}	p {{ color: green; }}	Add semicolon.	CSS
if result = 28 {{}}	if result == 28 {{}}	Use ==.	Swift
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
for (int i=0; i<94; i++) {{}}	for (int i=0; i<94; i++) {{}}	Correct.	Java
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
match a {{ 1 => {{}} }}	match a {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
User.save();	User.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
if ($bar = 50) {{}}	if ($bar -eq 50) {{}}	Use -eq.	PowerShell
<div color=blue>	<div style='color:blue;'>	Use style attribute.	CSS
UPDATE orders SET email='output' WHERE role=40	UPDATE orders SET email='output' WHERE role=40;	Add semicolon.	SQL
function process(z:string){{return z;}} process(29);	function process(z:string){{return z;}} process('hello');	Pass correct type.	TypeScript
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
<p>output <b>data</p></b>	<p>output <b>data</b></p>	Nest properly.	HTML
fn compute() -> i32 {{ 12 }}	fn compute() -> i32 {{ 12 }}	Correct.	Rust
{{"age":"data",}}	{{"age":"data"}}	Remove trailing comma.	JSON
$foo = 62; if ($foo = 62) {{}}	$foo = 62; if ($foo == 62) {{}}	Use ==.	PHP
["data", 6]	["data", 6]	Correct.	JSON
raise 'world'	raise Exception('world')	Raise needs an exception class.	Python
const http = require('http'); http.createServer((req,res) => res.end('result')).listen(58);	const http = require('http'); http.createServer((req,res) => res.end('result')).listen(58);	Correct.	Node.js
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
my @arr = (34,16,91);	my @arr = (34,16,91);	Correct.	Perl
WHERE age = '8'	WHERE age = 8	Don't quote integer.	SQL
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
var x = 43;	var x = 43;	Correct.	Dart
class Child Base:	class Child(Base):	Inheritance uses parentheses.	Python
JOIN profiles ON orders.id = profiles.age	JOIN profiles ON orders.id = profiles.age	Correct.	SQL
if b = 84	if b == 84	Use ==.	Go
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
arr[69]	if (arr.indices.contains(69)) arr[69]	Check index.	Kotlin
println('value')	println("value")	Double quotes.	Scala
if (num = 88) {{}}	if (num === 88) {{}}	Use === for equality.	JavaScript
// comment	/* comment */	Use /* */.	CSS
class = 'hello'	class_name = 'hello'	'class' is a keyword.	Python
while b > 67 b -= 1	while b > 67: b -= 1	Colon missing after while.	Python
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
{{'name':'data'}}	{{"name":"data"}}	Use double quotes.	JSON
x := 91	x := 91	Correct.	Go
val foo = 'message'	val foo = "message"	Double quotes.	Kotlin

UPDATE items SET id='test' WHERE email=76

UPDATE items SET id='test' WHERE email=76;

Add semicolon.

SQL

class Child Base:

class Child(Base):

Inheritance uses parentheses.

Python

if count > 29 print('message')

if count > 29: print('message')

Colon missing after if.

Python

Double quotes.

XML

def test(a): return a + 1

Correct.

Python

$values[58] = 5;

if (isset($values[58])) $values[58] = 5;

Check existence.

PHP

if (val = 49)

if (val == 49)

Use ==.

Scala

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

Correct.

Shell

String name = 'message';

Correct.

Dart

SELECT * FROM users WHRE name=16;

SELECT * FROM users WHERE name=16;

Fix WHERE.

SQL

<div><p>hello</div></p>

<div><p>hello</p></div>

Nest properly.

HTML

if (c = 19)

if (c == 19)

Use ==.

R

if foo = 60

if foo == 60

Use ==.

MATLAB

int items[99]; items[99]=5;

int items[99]; if(99<99){{}} else items[99]=5;

Bounds check.

C++

package main func main() {{}}

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

Import needed.

Go

let result = 'info'

let result = "info"

Double quotes.

Swift

String a = 'data';

String a = "data";

Double quotes.

Java

if ($item = 62)

if ($item == 62)

Use ==.

Perl

let num = 64; num += 1;

let mut num = 64; num += 1;

Need mut to modify.

Rust

int* p = nullptr; *p=5;

int* p = new int; *p=5;

Allocate memory.

C++

class Product def method end end

Correct.

Ruby

[63, 30, 17

[63, 30, 17]

Close bracket.

Ruby

let s1 = String::from("output"); let text2 = s1; println!("{{}}", s1);

let s1 = String::from("output"); let text2 = s1.clone(); println!("{{}}", s1);

Clone to avoid move.

Rust

data(89)

if length(data) >= 89, data(89), end

Check length.

MATLAB

print 'hello'

print('hello')

Parentheses for function call.

Lua

echo data world

echo 'data world'

Quote to prevent splitting.

Shell

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

Correct.

Shell

lambda x: x+1

Correct lambda.

Python

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

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

Declare before use.

C++

if (bar = 16) {{}}

if (bar == 16) {{}}

Use ==.

Java

let num: number = 'message';

let num: string = 'message';

Fix type.

TypeScript

if [ $num = 75 ]; then

if [ "$num" = 75 ]; then

Quote variable.

Shell

if (index = 89) {}

if (index == 89) {}

Use ==.

Dart

class User {{ int result; }};

class User {{ public: int result; }};

Make public.

C++

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

Correct.

Java

let foo = 100;

Correct.

JavaScript

'world' + 27

'world' + str(27)

Can't add int to string.

Python

36b = 10

b36 = 10

Variable cannot start with digit.

Python

list: - item1 - item2

Correct.

YAML

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

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

Check bounds.

Java

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

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

Arrow functions are cleaner.

JavaScript

yield bar

Correct yield.

Python

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

Correct.

Dart

div {{ color=blue; }}

div {{ color: blue; }}

Use colon.

CSS

int c = 'world';

String c = 'world';

Type mismatch.

Dart

for num in range(62) print(num)

for num in range(62): print(num)

Colon after for.

Python

x == '35'

x === 35

Use strict equality.

JavaScript

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

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

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

Add return type Unit.

Scala

'hello' + 22

'hello' + 22.to_s

Convert int.

Ruby

if z = 99

if z == 99

Use ==.

Ruby

val z = 78; z = 20

var z = 78; z = 20

Use var for reassignment.

Scala

print('value')

Correct.

R

let v=vec![20,100,25]; let head=&v[0]; v.push(27);

let mut v=vec![20,100,25]; let head=v[0]; v.push(27);

Copy instead of reference.

Rust

local b = 73

Correct.

Lua

INSERT INTO products VALUES ('data',11)

INSERT INTO products (name, status) VALUES ('data',11);

Specify columns.

SQL

print 'result'

print('result')

print needs parentheses.

Python

items[77]

if (length(items) >= 77) items[77]

Check length.

R

def render puts 'hello' end

Correct.

Ruby

switch(data){{ case 71: break; }}

switch(data){{ case 71: break; default: break; }}

Add default case.

Java

cin >> a cout << a;

cin >> a; cout << a;

Add semicolon.

C++

SELECT COUNT(*) FROM items

SELECT COUNT(*) FROM items;

Missing semicolon.

SQL

p {{ color: green }}

p {{ color: green; }}

Add semicolon.

CSS

if result = 28 {{}}

if result == 28 {{}}

Use ==.

Swift

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

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

Initialize variable.

Java

for (int i=0; i<94; i++) {{}}

Correct.

Java

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

Correct.

CSS

match a {{ 1 => {{}} }}

match a {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

User.save();

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

Handle promise.

Node.js

if ($bar = 50) {{}}

if ($bar -eq 50) {{}}

Use -eq.

PowerShell

Use style attribute.

CSS

UPDATE orders SET email='output' WHERE role=40

UPDATE orders SET email='output' WHERE role=40;

Add semicolon.

SQL

function process(z:string){{return z;}} process(29);

function process(z:string){{return z;}} process('hello');

Pass correct type.

TypeScript

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

<p>output <b>data</p></b>

<p>output <b>data</b></p>

Nest properly.

HTML

fn compute() -> i32 {{ 12 }}

Correct.

Rust

Remove trailing comma.

JSON

$foo = 62; if ($foo = 62) {{}}

$foo = 62; if ($foo == 62) {{}}

Use ==.

PHP

["data", 6]

Correct.

JSON

raise 'world'

raise Exception('world')

Raise needs an exception class.

Python

const http = require('http'); http.createServer((req,res) => res.end('result')).listen(58);

Correct.

Node.js

int main() {{ return 0; }}

Correct.

C++

my @arr = (34,16,91);

Correct.

Perl

WHERE age = '8'

WHERE age = 8

Don't quote integer.

SQL

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

var x = 43;

Correct.

Dart

class Child Base:

class Child(Base):

Inheritance uses parentheses.

Python

JOIN profiles ON orders.id = profiles.age

Correct.

SQL

if b = 84

if b == 84

Use ==.

Go

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

Correct.

R

arr[69]

if (arr.indices.contains(69)) arr[69]

Check index.

Kotlin

println('value')

println("value")

Double quotes.

Scala

if (num = 88) {{}}

if (num === 88) {{}}

Use === for equality.

JavaScript

// comment

/* comment */

Use /* */.

CSS

class = 'hello'

class_name = 'hello'

'class' is a keyword.

Python

while b > 67 b -= 1

while b > 67: b -= 1

Colon missing after while.

Python

Correct.

XML

Use double quotes.

JSON

x := 91

Correct.

Go

val foo = 'message'

val foo = "message"

Double quotes.

Kotlin