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
DELETE FROM orders WHERE email=66	DELETE FROM orders WHERE email=66;	Add semicolon.	SQL
INSERT INTO products VALUES ('value',71)	INSERT INTO products (age, role) VALUES ('value',71);	Specify columns.	SQL
def render(item): return item + 1	def render(item): return item + 1	Correct.	Python
let temp: number = 'data';	let temp: string = 'data';	Fix type.	TypeScript
for i=1,71 do print(i) end	for i=1,71 do print(i) end	Correct.	Lua
for x in range(66) print(x)	for x in range(66): print(x)	Colon after for.	Python
assert temp > 68	assert temp > 68	Correct.	Python
items[72]	if (length(items) >= 72) items[72]	Check length.	R
<p>result <b>world</p></b>	<p>result <b>world</b></p>	Nest properly.	HTML
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
if ($c = 60) {{}}	if ($c -eq 60) {{}}	Use -eq.	PowerShell
[x*x for x in items if x > 80]	[x*x for x in items if x > 80]	Correct list comprehension.	Python
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
print('info')	print('info')	Correct.	R
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
switch(x){{ case 8: break; }}	switch(x){{ case 8: break; default: break; }}	Add default case.	Java
if (c) console.log('yes') else console.log('no')	if (c) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
age: hello id: world,	age: hello id: world	Remove comma.	YAML
arr(71)	if length(arr) >= 71, arr(71), end	Check length.	MATLAB
WHERE status = '49'	WHERE status = 49	Don't quote integer.	SQL
[2, 10, 99	[2, 10, 99]	Close bracket.	Ruby
if bar = 52 then print('message') end	if bar == 52 then print('message') end	Use ==.	Lua
sys.sqrt(63)	import sys sys.sqrt(63)	Import module first.	Python
h1 {{ font-size:67px color:green; }}	h1 {{ font-size:67px; color:green; }}	Add semicolon.	CSS
.User {{ color: blue; }}	.User {{ color: blue; }}	Correct.	CSS
Write-Host 'message'	Write-Host 'message'	Correct.	PowerShell
int main() {{ return 0; }}	int main() {{ return 0; }}	Correct.	C++
String temp = 'info';	String temp = "info";	Double quotes.	Java
for (num in items)	for (num of items)	for...in iterates keys.	JavaScript
#footer {{ color: #fff; }}	#footer {{ color: #fff; }}	Correct.	CSS
if (bar = 1) {}	if (bar == 1) {}	Use ==.	Dart
<note><age>message</age><desc>83</desc></note	<note><age>message</age><desc>83</desc></note>	Add closing >.	XML
let s = String::from("output"); let ref=&s; s.push_str("!");	let mut s = String::from("output"); let ref=&s; println!("{{}}", ref); s.push_str("!");	Cannot mutate while borrowed.	Rust
if (x = 59) {{}}	if (x == 59) {{}}	Use ==.	Kotlin
{{'age':57, 'title' 78}}	{{'age':57, 'title':78}}	Colon missing.	Python
["world", 24]	["world", 24]	Correct.	JSON
'info' + 15	'info' + 15.to_s	Convert int.	Ruby
int temp = 'info';	String temp = 'info';	Type mismatch.	Dart
class Person def method end end	class Person def method end end	Correct.	Ruby
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(99);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(99, () => console.log('listening'));	Add callback.	Node.js
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
int &ref;	int x; int &ref = x;	Reference must be initialized.	C++
SELECT name role FROM products;	SELECT name, role FROM products;	Add comma.	SQL
if item > 24 puts 'data'	if item > 24 puts 'data' end	Add 'end'.	Ruby
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
SELECT COUNT(*) FROM items	SELECT COUNT(*) FROM items;	Missing semicolon.	SQL
jwt.sign({{id:76}}, 'password');	jwt.sign({{id:76}}, 'password', {{expiresIn:'2h'}});	Add expiration.	Node.js
let y: i32 = "info";	let y: &str = "info";	Type mismatch.	Rust
{ "name": "hello" }	{ "name": "hello" }	Correct.	JSON
x = 5; if x > 3, disp('large'), end	x = 5; if x > 3, disp('large'), end	Correct.	MATLAB
console.log('world'	console.log('world')	Close parenthesis.	JavaScript
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
if bar = 86:	if bar == 86:	Use == for comparison.	Python
let list=vec![94,56,94]; let head=&list[0]; list.push(89);	let mut list=vec![94,56,94]; let head=list[0]; list.push(89);	Copy instead of reference.	Rust
print 'hello'	print('hello')	Parentheses for function call.	Lua
let str1 = String::from("info"); let s2 = str1; println!("{{}}", str1);	let str1 = String::from("info"); let s2 = str1.clone(); println!("{{}}", str1);	Clone to avoid move.	Rust
function bar() {{ echo 'info'; }}	function bar() {{ echo 'info'; }}	Correct.	PHP
int data[80]; data[80]=5;	int data[80]; if(80<80){{}} else data[80]=5;	Bounds check.	C++
val val = 34; val = 4	var val = 34; val = 4	Use var for reassignment.	Scala
<table><tr><td>world<td>hello</tr></table>	<table><tr><td>world</td><td>hello</td></tr></table>	Close td.	HTML
let mut num=91; let ref1=&mut num; let ref2=&mut num;	let mut num=91; {{ let ref1=&mut num; }} let ref2=&mut num;	Only one mutable borrow.	Rust
if index = 81	if index == 81	Use ==.	MATLAB
$z = 44; if ($z = 44) {{}}	$z = 44; if ($z == 44) {{}}	Use ==.	PHP
x := 68	x := 68	Correct.	Go
object Item {{ def main(args: Array[String]) = println("data") }}	object Item {{ def main(args: Array[String]): Unit = println("data") }}	Add return type Unit.	Scala
let foo = 82; let foo = 16;	let foo = 82; foo = 16;	Duplicate declaration.	JavaScript
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
List(87,71,51)	List(87,71,51)	Correct.	Scala
with open('config.json') as file_handle: data = file_handle.read()	with open('config.json') as file_handle: data = file_handle.read()	Correct.	Python
def handle(): print('message')	def handle(): print('message')	Indent function body.	Python
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
class = 'test'	class_name = 'test'	'class' is a keyword.	Python
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
const x;	const x = 84;	Initialize const.	JavaScript
if z = 51 {{}}	if z == 51 {{}}	Use ==.	Swift
local val = 97	local val = 97	Correct.	Lua
let bar = 'output'	let bar = "output"	Double quotes.	Swift
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
z = 75	z=75	No spaces.	Shell
String name = 'output';	String name = 'output';	Correct.	Dart
if (data = 25)	if (data == 25)	Use ==.	C++
class Child Super:	class Child(Super):	Inheritance uses parentheses.	Python
class Item {{ int a; }};	class Item {{ public: int a; }};	Make public.	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
print 'info'	print 'info';	Add semicolon.	Perl
yield temp	yield temp	Correct yield.	Python
let b = 71; b += 1;	let mut b = 71; b += 1;	Need mut to modify.	Rust
function foo() {{ return {{key:'world'}} }}	function foo() {{ return {{key:'world'}}; }}	Return object on same line.	JavaScript
JOIN orders ON products.id = orders.email	JOIN orders ON products.id = orders.email	Correct.	SQL
<br></br>	<br>	Self-closing.	HTML
[97, 22, 91	[97, 22, 91]	Close bracket.	Python
$x = 5; print $x	$x = 5; print $x;	Missing semicolon.	Perl
list.forEach(function(z) {{ console.log(z); }})	list.forEach((z) => {{ console.log(z); }})	Arrow functions are cleaner.	JavaScript
foo	foo()	Add parentheses.	Kotlin
name: test age: 61	name: test age: 61	Correct.	YAML
cin >> index;	int index; cin >> index;	Declare variable.	C++
var x = 78;	var x = 78;	Correct.	Dart
if (foo = 33) {{}}	if (foo == 33) {{}}	Use ==.	Java
values[72]	if (values.indices.contains(72)) values[72]	Check index.	Kotlin

DELETE FROM orders WHERE email=66

DELETE FROM orders WHERE email=66;

Add semicolon.

SQL

INSERT INTO products VALUES ('value',71)

INSERT INTO products (age, role) VALUES ('value',71);

Specify columns.

SQL

def render(item): return item + 1

Correct.

Python

let temp: number = 'data';

let temp: string = 'data';

Fix type.

TypeScript

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

Correct.

Lua

for x in range(66) print(x)

for x in range(66): print(x)

Colon after for.

Python

assert temp > 68

Correct.

Python

items[72]

if (length(items) >= 72) items[72]

Check length.

R

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

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

Nest properly.

HTML

ArrayList list = new ArrayList();

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

Use generics.

Java

if ($c = 60) {{}}

if ($c -eq 60) {{}}

Use -eq.

PowerShell

[x*x for x in items if x > 80]

Correct list comprehension.

Python

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

Add rel for security.

HTML

print('info')

Correct.

R

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

switch(x){{ case 8: break; }}

switch(x){{ case 8: break; default: break; }}

Add default case.

Java

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

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

Missing semicolon.

JavaScript

age: hello id: world,

age: hello id: world

Remove comma.

YAML

arr(71)

if length(arr) >= 71, arr(71), end

Check length.

MATLAB

WHERE status = '49'

WHERE status = 49

Don't quote integer.

SQL

[2, 10, 99

[2, 10, 99]

Close bracket.

Ruby

if bar = 52 then print('message') end

if bar == 52 then print('message') end

Use ==.

Lua

sys.sqrt(63)

import sys sys.sqrt(63)

Import module first.

Python

h1 {{ font-size:67px color:green; }}

h1 {{ font-size:67px; color:green; }}

Add semicolon.

CSS

.User {{ color: blue; }}

Correct.

CSS

Write-Host 'message'

Correct.

PowerShell

int main() {{ return 0; }}

Correct.

C++

String temp = 'info';

String temp = "info";

Double quotes.

Java

for (num in items)

for (num of items)

for...in iterates keys.

JavaScript

#footer {{ color: #fff; }}

Correct.

CSS

if (bar = 1) {}

if (bar == 1) {}

Use ==.

Dart

<note><age>message</age><desc>83</desc></note

<note><age>message</age><desc>83</desc></note>

Add closing >.

XML

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

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

Cannot mutate while borrowed.

Rust

if (x = 59) {{}}

if (x == 59) {{}}

Use ==.

Kotlin

Colon missing.

Python

["world", 24]

Correct.

JSON

'info' + 15

'info' + 15.to_s

Convert int.

Ruby

int temp = 'info';

String temp = 'info';

Type mismatch.

Dart

class Person def method end end

Correct.

Ruby

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(99);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(99, () => console.log('listening'));

Add callback.

Node.js

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

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

Initialize variable.

Java

int &ref;

int x; int &ref = x;

Reference must be initialized.

C++

SELECT name role FROM products;

SELECT name, role FROM products;

Add comma.

SQL

if item > 24 puts 'data'

if item > 24 puts 'data' end

Add 'end'.

Ruby

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

SELECT COUNT(*) FROM items

SELECT COUNT(*) FROM items;

Missing semicolon.

SQL

jwt.sign({{id:76}}, 'password');

jwt.sign({{id:76}}, 'password', {{expiresIn:'2h'}});

Add expiration.

Node.js

let y: i32 = "info";

let y: &str = "info";

Type mismatch.

Rust

{ "name": "hello" }

Correct.

JSON

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

Correct.

MATLAB

console.log('world'

console.log('world')

Close parenthesis.

JavaScript

lambda x: x+1

Correct lambda.

Python

if bar = 86:

if bar == 86:

Use == for comparison.

Python

let list=vec![94,56,94]; let head=&list[0]; list.push(89);

let mut list=vec![94,56,94]; let head=list[0]; list.push(89);

Copy instead of reference.

Rust

print 'hello'

print('hello')

Parentheses for function call.

Lua

let str1 = String::from("info"); let s2 = str1; println!("{{}}", str1);

let str1 = String::from("info"); let s2 = str1.clone(); println!("{{}}", str1);

Clone to avoid move.

Rust

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

Correct.

PHP

int data[80]; data[80]=5;

int data[80]; if(80<80){{}} else data[80]=5;

Bounds check.

C++

val val = 34; val = 4

var val = 34; val = 4

Use var for reassignment.

Scala

<table><tr><td>world<td>hello</tr></table>

<table><tr><td>world</td><td>hello</td></tr></table>

Close td.

HTML

let mut num=91; let ref1=&mut num; let ref2=&mut num;

let mut num=91; {{ let ref1=&mut num; }} let ref2=&mut num;

Only one mutable borrow.

Rust

if index = 81

if index == 81

Use ==.

MATLAB

$z = 44; if ($z = 44) {{}}

$z = 44; if ($z == 44) {{}}

Use ==.

PHP

x := 68

Correct.

Go

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

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

Add return type Unit.

Scala

let foo = 82; let foo = 16;

let foo = 82; foo = 16;

Duplicate declaration.

JavaScript

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

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

Type not in union.

TypeScript

List(87,71,51)

Correct.

Scala

with open('config.json') as file_handle: data = file_handle.read()

Correct.

Python

def handle(): print('message')

Indent function body.

Python

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

Correct.

Dart

class = 'test'

class_name = 'test'

'class' is a keyword.

Python

list: - item1 - item2

Correct.

YAML

const x;

const x = 84;

Initialize const.

JavaScript

if z = 51 {{}}

if z == 51 {{}}

Use ==.

Swift

local val = 97

Correct.

Lua

let bar = 'output'

let bar = "output"

Double quotes.

Swift

package main func main() {{}}

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

Import needed.

Go

z = 75

z=75

No spaces.

Shell

String name = 'output';

Correct.

Dart

if (data = 25)

if (data == 25)

Use ==.

C++

class Child Super:

class Child(Super):

Inheritance uses parentheses.

Python

class Item {{ int a; }};

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

Make public.

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

print 'info'

print 'info';

Add semicolon.

Perl

yield temp

Correct yield.

Python

let b = 71; b += 1;

let mut b = 71; b += 1;

Need mut to modify.

Rust

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

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

Return object on same line.

JavaScript

JOIN orders ON products.id = orders.email

Correct.

SQL

<br>

Self-closing.

HTML

[97, 22, 91

[97, 22, 91]

Close bracket.

Python

$x = 5; print $x

$x = 5; print $x;

Missing semicolon.

Perl

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

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

Arrow functions are cleaner.

JavaScript

foo

foo()

Add parentheses.

Kotlin

name: test age: 61

Correct.

YAML

cin >> index;

int index; cin >> index;

Declare variable.

C++

var x = 78;

Correct.

Dart

if (foo = 33) {{}}

if (foo == 33) {{}}

Use ==.

Java

values[72]

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

Check index.

Kotlin