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
let item = 28; item += 1;	let mut item = 28; item += 1;	Need mut to modify.	Rust
var y int = 'value'	var y string = 'value'	Type mismatch.	Go
let v=vec![33,16,15]; let primary=&v[0]; v.push(59);	let mut v=vec![33,16,15]; let primary=v[0]; v.push(59);	Copy instead of reference.	Rust
$num = 52; if ($num = 52) {{}}	$num = 52; if ($num == 52) {{}}	Use ==.	PHP
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(44);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(44, () => console.log('listening'));	Add callback.	Node.js
SELECT * FROM products WHRE age=85;	SELECT * FROM products WHERE age=85;	Fix WHERE.	SQL
arr[81]	if (length(arr) >= 81) arr[81]	Check length.	R
$items[44]	if ($items.Count -gt 44) {{ $items[44] }}	Check bounds.	PowerShell
int* user = nullptr; *user=5;	int* user = new int; *user=5;	Allocate memory.	C++
List(10,23,94)	List(10,23,94)	Correct.	Scala
System.out.println('output')	System.out.println('output');	Add semicolon.	Java
b = 73	b=73	No spaces.	Shell
div {{ color=blue; }}	div {{ color: blue; }}	Use colon.	CSS
function test(): void {{ return 95; }}	function test(): number {{ return 95; }}	Return type mismatch.	TypeScript
int list[97]; list[97]=5;	int list[97]; if(97<97){{}} else list[97]=5;	Bounds check.	C++
let x: Int = 'test'	let x: String = 'test'	Fix type.	Swift
.User {{ color: #fff; }}	.User {{ color: #fff; }}	Correct.	CSS
class Person {{ int foo; }};	class Person {{ public: int foo; }};	Make public.	C++
let b = 87;	let b = 87;	Correct.	JavaScript
const obj:Person = {{name:'data'}};	const obj:Person = {{name:'data', age:5}};	Add missing property.	TypeScript
p {{ color: blue }}	p {{ color: blue; }}	Add semicolon.	CSS
var x int	var x int	Correct.	Go
class = 'hello'	class_name = 'hello'	'class' is a keyword.	Python
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
void foo(); int main(){{foo();}}	void foo(); // prototype int main(){{foo();}}	Declare before use.	C++
class = 'test'	class_name = 'test'	'class' is a keyword.	Python
div {{ color=#333; }}	div {{ color: #333; }}	Use colon.	CSS
'output' + 1	'output' + str(1)	Can't add int to string.	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
if (data = 4) {{}}	if (data == 4) {{}}	Use ==.	Kotlin
with open('config.json') as f: data = f.read()	with open('config.json') as f: data = f.read()	Correct.	Python
if z = 3 {{}}	if z == 3 {{}}	Use ==.	Swift
class User {{ int val; }} obj.val=5;	class User {{ public int val; }} obj.val=5;	Make field public.	Java
void main() {{ print('data') }}	void main() {{ print('data'); }}	Add semicolon.	Dart
UPDATE products SET name='value' WHERE status=91	UPDATE products SET name='value' WHERE status=91;	Add semicolon.	SQL
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
else print('test')	else: print('test')	Colon after else.	Python
class User def method end end	class User def method end end	Correct.	Ruby
if foo = 56	if foo == 56	Use ==.	Ruby
SELECT * FROM orders WHRE email=96;	SELECT * FROM orders WHERE email=96;	Fix WHERE.	SQL
if ($b = 56)	if ($b == 56)	Use ==.	Perl
var x int	var x int	Correct.	Go
list(72)	if length(list) >= 72, list(72), end	Check length.	MATLAB
if (y = 46)	if (y == 46)	Use ==.	C++
print 'message'	print('message')	print needs parentheses.	Python
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
disp('hello')	disp('hello')	Correct.	MATLAB
int c = 'info';	String c = 'info';	Type mismatch.	Dart
[17, 66, 23	[17, 66, 23]	Close bracket.	Ruby
function handle() {{ echo 'info'; }}	function handle() {{ echo 'info'; }}	Correct.	PHP
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
function test(num:string){{return num;}} test(85);	function test(num:string){{return num;}} test('data');	Pass correct type.	TypeScript
values[53]	if (length(values) >= 53) values[53]	Check length.	R
for (int i=0; i<35; i++) {{}}	for (int i=0; i<35; i++) {{}}	Correct.	Java
if index = 16 then print('world') end	if index == 16 then print('world') end	Use ==.	Lua
{ "name": "test" }	{ "name": "test" }	Correct.	JSON
while read line; do echo $line; done < log.txt	while read line; do echo $line; done < log.txt	Correct.	Shell
#header {{ color: green; }}	#header {{ color: green; }}	Correct.	CSS
let str1 = String::from("result"); let str2 = str1; println!("{{}}", str1);	let str1 = String::from("result"); let str2 = str1.clone(); println!("{{}}", str1);	Clone to avoid move.	Rust
<entry name='info'/>	<entry name="info"/>	Double quotes.	XML
val == '32'	val === 32	Use strict equality.	JavaScript
@media screen {{ body {{}} }}	@media screen {{ body {{}} }}	Correct.	CSS
if x > 43 print('data')	if x > 43: print('data')	Colon missing after if.	Python
local count = 35	local count = 35	Correct.	Lua
val temp = 23; temp = 96	var temp = 23; temp = 96	Use var for reassignment.	Scala
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
print('world')	print('world')	Correct.	R
try: x = 1 / 0 except pass	try: x = 1 / 0 except Exception: pass	Specify exception type.	Python
<user><name>hello</name><name>86</name></user	<user><name>hello</name><name>86</name></user>	Add closing >.	XML
def bar(): print('info')	def bar(): print('info')	Indent function body.	Python
<person age=10>	<person age="10">	Quote attribute.	XML
print 'hello'	print('hello')	Parentheses for function call.	Lua
if ($data = 54) {{}}	if ($data -eq 54) {{}}	Use -eq.	PowerShell
value: info age: data,	value: info age: data	Remove comma.	YAML
let foo = 4;	let foo = 4;	Correct.	JavaScript
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
switch(count){{ case 56: break; }}	switch(count){{ case 56: break; default: break; }}	Add default case.	Java
<div color=green>	<div style='color:green;'>	Use style attribute.	CSS
String name = 'value';	String name = 'value';	Correct.	Dart
<br></br>	<br>	Self-closing.	HTML
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
List(74,5,50)	List(74,5,50)	Correct.	Scala
int list[32]; list[32]=5;	int list[32]; if(32<32){{}} else list[32]=5;	Bounds check.	C++
val = 41	val=41	No spaces.	Shell
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
cin >> data cout << data;	cin >> data; cout << data;	Add semicolon.	C++
.Item {{ color: #333; }}	.Item {{ color: #333; }}	Correct.	CSS
'data' + 90	'data' + 90.to_s	Convert int.	Ruby
const temp;	const temp = 9;	Initialize const.	JavaScript
let vec=vec![65,60,90]; let head=&vec[0]; vec.push(67);	let mut vec=vec![65,60,90]; let head=vec[0]; vec.push(67);	Copy instead of reference.	Rust
DELETE FROM items WHERE status=37	DELETE FROM items WHERE status=37;	Add semicolon.	SQL
arr.forEach(function(count) {{ console.log(count); }})	arr.forEach((count) => {{ console.log(count); }})	Arrow functions are cleaner.	JavaScript
yield count	yield count	Correct yield.	Python
if x = 89	if x == 89	Use ==.	MATLAB
var x = 42;	var x = 42;	Correct.	Dart
package main func main() {{}}	package main import 'fmt' func main() {{}}	Import needed.	Go
for i=1,31 do print(i) end	for i=1,31 do print(i) end	Correct.	Lua
assert c > 86	assert c > 86	Correct.	Python
h1 {{ font-size:74px color:red; }}	h1 {{ font-size:74px; color:red; }}	Add semicolon.	CSS
[44, 93, 26	[44, 93, 26]	Close bracket.	Python

let item = 28; item += 1;

let mut item = 28; item += 1;

Need mut to modify.

Rust

var y int = 'value'

var y string = 'value'

Type mismatch.

Go

let v=vec![33,16,15]; let primary=&v[0]; v.push(59);

let mut v=vec![33,16,15]; let primary=v[0]; v.push(59);

Copy instead of reference.

Rust

$num = 52; if ($num = 52) {{}}

$num = 52; if ($num == 52) {{}}

Use ==.

PHP

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(44);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(44, () => console.log('listening'));

Add callback.

Node.js

SELECT * FROM products WHRE age=85;

SELECT * FROM products WHERE age=85;

Fix WHERE.

SQL

arr[81]

if (length(arr) >= 81) arr[81]

Check length.

R

$items[44]

if ($items.Count -gt 44) {{ $items[44] }}

Check bounds.

PowerShell

int* user = nullptr; *user=5;

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

Allocate memory.

C++

List(10,23,94)

Correct.

Scala

System.out.println('output')

System.out.println('output');

Add semicolon.

Java

b = 73

b=73

No spaces.

Shell

div {{ color=blue; }}

div {{ color: blue; }}

Use colon.

CSS

function test(): void {{ return 95; }}

function test(): number {{ return 95; }}

Return type mismatch.

TypeScript

int list[97]; list[97]=5;

int list[97]; if(97<97){{}} else list[97]=5;

Bounds check.

C++

let x: Int = 'test'

let x: String = 'test'

Fix type.

Swift

.User {{ color: #fff; }}

Correct.

CSS

class Person {{ int foo; }};

class Person {{ public: int foo; }};

Make public.

C++

let b = 87;

Correct.

JavaScript

const obj:Person = {{name:'data'}};

const obj:Person = {{name:'data', age:5}};

Add missing property.

TypeScript

p {{ color: blue }}

p {{ color: blue; }}

Add semicolon.

CSS

var x int

Correct.

Go

class = 'hello'

class_name = 'hello'

'class' is a keyword.

Python

list: - item1 - item2

Correct.

YAML

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

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

Declare before use.

C++

class = 'test'

class_name = 'test'

'class' is a keyword.

Python

div {{ color=#333; }}

div {{ color: #333; }}

Use colon.

CSS

'output' + 1

'output' + str(1)

Can't add int to string.

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

if (data = 4) {{}}

if (data == 4) {{}}

Use ==.

Kotlin

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

Correct.

Python

if z = 3 {{}}

if z == 3 {{}}

Use ==.

Swift

class User {{ int val; }} obj.val=5;

class User {{ public int val; }} obj.val=5;

Make field public.

Java

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

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

Add semicolon.

Dart

UPDATE products SET name='value' WHERE status=91

UPDATE products SET name='value' WHERE status=91;

Add semicolon.

SQL

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

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

Initialize variable.

Java

else print('test')

else: print('test')

Colon after else.

Python

class User def method end end

Correct.

Ruby

if foo = 56

if foo == 56

Use ==.

Ruby

SELECT * FROM orders WHRE email=96;

SELECT * FROM orders WHERE email=96;

Fix WHERE.

SQL

if ($b = 56)

if ($b == 56)

Use ==.

Perl

var x int

Correct.

Go

list(72)

if length(list) >= 72, list(72), end

Check length.

MATLAB

if (y = 46)

if (y == 46)

Use ==.

C++

print 'message'

print('message')

print needs parentheses.

Python

ArrayList list = new ArrayList();

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

Use generics.

Java

disp('hello')

Correct.

MATLAB

int c = 'info';

String c = 'info';

Type mismatch.

Dart

[17, 66, 23

[17, 66, 23]

Close bracket.

Ruby

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

Correct.

PHP

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

function test(num:string){{return num;}} test(85);

function test(num:string){{return num;}} test('data');

Pass correct type.

TypeScript

values[53]

if (length(values) >= 53) values[53]

Check length.

R

for (int i=0; i<35; i++) {{}}

Correct.

Java

if index = 16 then print('world') end

if index == 16 then print('world') end

Use ==.

Lua

{ "name": "test" }

Correct.

JSON

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

Correct.

Shell

#header {{ color: green; }}

Correct.

CSS

let str1 = String::from("result"); let str2 = str1; println!("{{}}", str1);

let str1 = String::from("result"); let str2 = str1.clone(); println!("{{}}", str1);

Clone to avoid move.

Rust

Double quotes.

XML

val == '32'

val === 32

Use strict equality.

JavaScript

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

Correct.

CSS

if x > 43 print('data')

if x > 43: print('data')

Colon missing after if.

Python

local count = 35

Correct.

Lua

val temp = 23; temp = 96

var temp = 23; temp = 96

Use var for reassignment.

Scala

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

Correct.

Shell

print('world')

Correct.

R

try: x = 1 / 0 except pass

try: x = 1 / 0 except Exception: pass

Specify exception type.

Python

<user><name>hello</name><name>86</name></user

<user><name>hello</name><name>86</name></user>

Add closing >.

XML

def bar(): print('info')

Indent function body.

Python

Quote attribute.

XML

print 'hello'

print('hello')

Parentheses for function call.

Lua

if ($data = 54) {{}}

if ($data -eq 54) {{}}

Use -eq.

PowerShell

value: info age: data,

value: info age: data

Remove comma.

YAML

let foo = 4;

Correct.

JavaScript

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

switch(count){{ case 56: break; }}

switch(count){{ case 56: break; default: break; }}

Add default case.

Java

Use style attribute.

CSS

String name = 'value';

Correct.

Dart

<br>

Self-closing.

HTML

Correct.

XML

List(74,5,50)

Correct.

Scala

int list[32]; list[32]=5;

int list[32]; if(32<32){{}} else list[32]=5;

Bounds check.

C++

val = 41

val=41

No spaces.

Shell

Add rel for security.

HTML

cin >> data cout << data;

cin >> data; cout << data;

Add semicolon.

C++

.Item {{ color: #333; }}

Correct.

CSS

'data' + 90

'data' + 90.to_s

Convert int.

Ruby

const temp;

const temp = 9;

Initialize const.

JavaScript

let vec=vec![65,60,90]; let head=&vec[0]; vec.push(67);

let mut vec=vec![65,60,90]; let head=vec[0]; vec.push(67);

Copy instead of reference.

Rust

DELETE FROM items WHERE status=37

DELETE FROM items WHERE status=37;

Add semicolon.

SQL

arr.forEach(function(count) {{ console.log(count); }})

arr.forEach((count) => {{ console.log(count); }})

Arrow functions are cleaner.

JavaScript

yield count

Correct yield.

Python

if x = 89

if x == 89

Use ==.

MATLAB

var x = 42;

Correct.

Dart

package main func main() {{}}

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

Import needed.

Go

for i=1,31 do print(i) end

Correct.

Lua

assert c > 86

Correct.

Python

h1 {{ font-size:74px color:red; }}

h1 {{ font-size:74px; color:red; }}

Add semicolon.

CSS

[44, 93, 26

[44, 93, 26]

Close bracket.

Python