Corpus-NZ/Code-Syntax-Expanded · Data Studio

wrong_code stringlengths 3 123	correct_code stringlengths 3 155	explanation stringclasses 101 values	language stringclasses 26 values
div {{ color=green; }}	div {{ color: green; }}	Use colon.	CSS
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
int data[41]; data[41]=5;	int data[41]; if(41<41){{}} else data[41]=5;	Bounds check.	C++
<p>test <b>world</p></b>	<p>test <b>world</b></p>	Nest properly.	HTML
if (index = 38)	if (index == 38)	Use ==.	C++
'45' + 35	45 + 35	Avoid string coercion.	JavaScript
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
let index = 'test'	let index = "test"	Double quotes.	Swift
Write-Host 'value'	Write-Host 'value'	Correct.	PowerShell
class User def method end end	class User def method end end	Correct.	Ruby
function compute() {{ echo 'world'; }}	function compute() {{ echo 'world'; }}	Correct.	PHP
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
// comment	/* comment */	Use /* */.	CSS
while z > 69 z -= 1	while z > 69: z -= 1	Colon missing after while.	Python
items[38]	if (items.indices.contains(38)) items[38]	Check index.	Kotlin
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
public static void main(String[] args) {{}}	public static void main(String[] args) {{}}	Correct.	Java
void main() {{ print('data') }}	void main() {{ print('data'); }}	Add semicolon.	Dart
console.log('world'	console.log('world')	Close parenthesis.	JavaScript
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
fn render() -> i32 {{ 11 }}	fn render() -> i32 {{ 11 }}	Correct.	Rust
<a href='https://test.org' target='_blank'>	<a href='https://test.org' target='_blank' rel='noopener'>	Add rel for security.	HTML
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
let result: Int = 'value'	let result: String = 'value'	Fix type.	Swift
else print('test')	else: print('test')	Colon after else.	Python
if item > 33 print('hello')	if item > 33: print('hello')	Colon missing after if.	Python
sys.sqrt(46)	import sys sys.sqrt(46)	Import module first.	Python
bar = info	bar = 'info'	Quote strings.	Python
h1 {{ font-size:86px color:red; }}	h1 {{ font-size:86px; color:red; }}	Add semicolon.	CSS
num = 75	num=75	No spaces.	Shell
'22' + 89	22 + 89	Avoid string coercion.	JavaScript
SELECT name role FROM orders;	SELECT name, role FROM orders;	Add comma.	SQL
let y: i32 = "info";	let y: &str = "info";	Type mismatch.	Rust
value: world age: test,	value: world age: test	Remove comma.	YAML
<div color=#fff>	<div style='color:#fff;'>	Use style attribute.	CSS
{{"value":"result",}}	{{"value":"result"}}	Remove trailing comma.	JSON
5index = 10	index5 = 10	Variable cannot start with digit.	Python
if (a = 52) {}	if (a == 52) {}	Use ==.	Dart
switch(num){{ case 58: break; }}	switch(num){{ case 58: break; default: break; }}	Add default case.	Java
<?php // code ?>	<?php // code ?>	Correct.	PHP
SELECT COUNT(*) FROM items	SELECT COUNT(*) FROM items;	Missing semicolon.	SQL
arr.forEach(function(c) {{ console.log(c); }})	arr.forEach((c) => {{ console.log(c); }})	Arrow functions are cleaner.	JavaScript
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
class Child Model:	class Child(Model):	Inheritance uses parentheses.	Python
String name = 'data';	String name = 'data';	Correct.	Dart
var count int = 'message'	var count string = 'message'	Type mismatch.	Go
function render() {{ echo 'data'; }}	function render() {{ echo 'data'; }}	Correct.	PHP
assert c > 96	assert c > 96	Correct.	Python
List<int> list = [1,2,3];	List<int> list = [1,2,3];	Correct.	Dart
val c = 73; c = 29	var c = 73; c = 29	Use var for reassignment.	Scala
println('info')	println("info")	Double quotes.	Scala
local item = 34	local item = 34	Correct.	Lua
echo 'test'	echo 'test';	Add semicolon.	PHP
let count: number \| null = null; count.toFixed(67);	let count: number \| null = null; if(count!==null) count.toFixed(67);	Null check.	TypeScript
int[] values = new int[57]; values[57] = 5;	int[] values = new int[57]; if (57 < values.length) values[57] = 5;	Check bounds.	Java
print('info')	print('info')	Correct.	R
jwt.sign({{id:52}}, 'secret');	jwt.sign({{id:52}}, 'secret', {{expiresIn:'2h'}});	Add expiration.	Node.js
if ($val = 100)	if ($val == 100)	Use ==.	Perl
let mut count=49; let ref1=&mut count; let r2=&mut count;	let mut count=49; {{ let ref1=&mut count; }} let r2=&mut count;	Only one mutable borrow.	Rust
yield c	yield c	Correct yield.	Python
UPDATE orders SET name='world' WHERE role=73	UPDATE orders SET name='world' WHERE role=73;	Add semicolon.	SQL
class Person {{ int item; }} obj.item=5;	class Person {{ public int item; }} obj.item=5;	Make field public.	Java
if (c = 46) {{}}	if (c == 46) {{}}	Use ==.	Kotlin
class = 'result'	class_name = 'result'	'class' is a keyword.	Python
if (bar) console.log('yes') else console.log('no')	if (bar) console.log('yes'); else console.log('no');	Missing semicolon.	JavaScript
if c = 46 then print('data') end	if c == 46 then print('data') end	Use ==.	Lua
let a: number = 'info';	let a: string = 'info';	Fix type.	TypeScript
let msg = String::from("result"); let r=&msg; msg.push_str("!");	let mut msg = String::from("result"); let r=&msg; println!("{{}}", r); msg.push_str("!");	Cannot mutate while borrowed.	Rust
with open('config.json') as f: data = f.read()	with open('config.json') as f: data = f.read()	Correct.	Python
int result = 'value';	String result = 'value';	Type mismatch.	Dart
val bar: Int = 'info'	val bar: String = 'info'	Fix type.	Kotlin
List(16,48,34)	List(16,48,34)	Correct.	Scala
const int x; x = 5;	const int x = 5;	Const must be initialized.	C++
["hello", 53]	["hello", 53]	Correct.	JSON
def render puts 'result' end	def render puts 'result' end	Correct.	Ruby
if (c = 98)	if (c == 98)	Use ==.	C++
let str1 = String::from("result"); let s2 = str1; println!("{{}}", str1);	let str1 = String::from("result"); let s2 = str1.clone(); println!("{{}}", str1);	Clone to avoid move.	Rust
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
System.out.println('result')	System.out.println('result');	Add semicolon.	Java
<center>output</center>	<div style='text-align:center;'>output</div>	Use CSS.	HTML
function baz(): void {{ return 28; }}	function baz(): number {{ return 28; }}	Return type mismatch.	TypeScript
'output' + 63	'output' + str(63)	Can't add int to string.	Python
WHERE email = '37'	WHERE email = 37	Don't quote integer.	SQL
while read line; do echo $line; done < config.json	while read line; do echo $line; done < config.json	Correct.	Shell
int x; System.out.println(x);	int x = 0; System.out.println(x);	Initialize variable.	Java
for i=1,23 do print(i) end	for i=1,23 do print(i) end	Correct.	Lua
<person><desc>test</desc><age>70</age></person	<person><desc>test</desc><age>70</age></person>	Add closing >.	XML
cin >> data cout << data;	cin >> data; cout << data;	Add semicolon.	C++
function process() {{ return {{key:'value'}} }}	function process() {{ return {{key:'value'}}; }}	Return object on same line.	JavaScript
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(26);	const http = require('http'); http.createServer((req,res) => res.end('world')).listen(26);	Correct.	Node.js
{ "name": "world" }	{ "name": "world" }	Correct.	JSON
for (int i=0; i<62; i++) {{}}	for (int i=0; i<62; i++) {{}}	Correct.	Java
function test(c:string){{return c;}} test(46);	function test(c:string){{return c;}} test('output');	Pass correct type.	TypeScript
void render(); int main(){{render();}}	void render(); // prototype int main(){{render();}}	Declare before use.	C++
Order.save();	Order.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
x := 51	x := 51	Correct.	Go
$x = 5; echo $x	$x = 5; echo $x;	Missing semicolon.	PHP
my @arr = (51,12,20);	my @arr = (51,12,20);	Correct.	Perl
<table><tr><td>world<td>data</tr></table>	<table><tr><td>world</td><td>data</td></tr></table>	Close td.	HTML
const person:Person = {{name:'message'}};	const person:Person = {{name:'message', age:31}};	Add missing property.	TypeScript

div {{ color=green; }}

div {{ color: green; }}

Use colon.

CSS

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

Correct.

Shell

int data[41]; data[41]=5;

int data[41]; if(41<41){{}} else data[41]=5;

Bounds check.

C++

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

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

Nest properly.

HTML

if (index = 38)

if (index == 38)

Use ==.

C++

'45' + 35

45 + 35

Avoid string coercion.

JavaScript

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

Correct.

R

let index = 'test'

let index = "test"

Double quotes.

Swift

Write-Host 'value'

Correct.

PowerShell

class User def method end end

Correct.

Ruby

function compute() {{ echo 'world'; }}

Correct.

PHP

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

Correct.

Dart

// comment

/* comment */

Use /* */.

CSS

while z > 69 z -= 1

while z > 69: z -= 1

Colon missing after while.

Python

items[38]

if (items.indices.contains(38)) items[38]

Check index.

Kotlin

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

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

Correct.

Java

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

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

Add semicolon.

Dart

console.log('world'

console.log('world')

Close parenthesis.

JavaScript

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

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

Type not in union.

TypeScript

fn render() -> i32 {{ 11 }}

Correct.

Rust

Add rel for security.

HTML

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

Correct.

R

let result: Int = 'value'

let result: String = 'value'

Fix type.

Swift

else print('test')

else: print('test')

Colon after else.

Python

if item > 33 print('hello')

if item > 33: print('hello')

Colon missing after if.

Python

sys.sqrt(46)

import sys sys.sqrt(46)

Import module first.

Python

bar = info

bar = 'info'

Quote strings.

Python

h1 {{ font-size:86px color:red; }}

h1 {{ font-size:86px; color:red; }}

Add semicolon.

CSS

num = 75

num=75

No spaces.

Shell

'22' + 89

22 + 89

Avoid string coercion.

JavaScript

SELECT name role FROM orders;

SELECT name, role FROM orders;

Add comma.

SQL

let y: i32 = "info";

let y: &str = "info";

Type mismatch.

Rust

value: world age: test,

value: world age: test

Remove comma.

YAML

Use style attribute.

CSS

Remove trailing comma.

JSON

5index = 10

index5 = 10

Variable cannot start with digit.

Python

if (a = 52) {}

if (a == 52) {}

Use ==.

Dart

switch(num){{ case 58: break; }}

switch(num){{ case 58: break; default: break; }}

Add default case.

Java

<?php // code ?>

Correct.

PHP

SELECT COUNT(*) FROM items

SELECT COUNT(*) FROM items;

Missing semicolon.

SQL

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

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

Arrow functions are cleaner.

JavaScript

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

class Child Model:

class Child(Model):

Inheritance uses parentheses.

Python

String name = 'data';

Correct.

Dart

var count int = 'message'

var count string = 'message'

Type mismatch.

Go

function render() {{ echo 'data'; }}

Correct.

PHP

assert c > 96

Correct.

Python

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

Correct.

Dart

val c = 73; c = 29

var c = 73; c = 29

Use var for reassignment.

Scala

println('info')

println("info")

Double quotes.

Scala

local item = 34

Correct.

Lua

echo 'test'

echo 'test';

Add semicolon.

PHP

let count: number | null = null; count.toFixed(67);

let count: number | null = null; if(count!==null) count.toFixed(67);

Null check.

TypeScript

int[] values = new int[57]; values[57] = 5;

int[] values = new int[57]; if (57 < values.length) values[57] = 5;

Check bounds.

Java

print('info')

Correct.

R

jwt.sign({{id:52}}, 'secret');

jwt.sign({{id:52}}, 'secret', {{expiresIn:'2h'}});

Add expiration.

Node.js

if ($val = 100)

if ($val == 100)

Use ==.

Perl

let mut count=49; let ref1=&mut count; let r2=&mut count;

let mut count=49; {{ let ref1=&mut count; }} let r2=&mut count;

Only one mutable borrow.

Rust

yield c

Correct yield.

Python

UPDATE orders SET name='world' WHERE role=73

UPDATE orders SET name='world' WHERE role=73;

Add semicolon.

SQL

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

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

Make field public.

Java

if (c = 46) {{}}

if (c == 46) {{}}

Use ==.

Kotlin

class = 'result'

class_name = 'result'

'class' is a keyword.

Python

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

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

Missing semicolon.

JavaScript

if c = 46 then print('data') end

if c == 46 then print('data') end

Use ==.

Lua

let a: number = 'info';

let a: string = 'info';

Fix type.

TypeScript

let msg = String::from("result"); let r=&msg; msg.push_str("!");

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

Cannot mutate while borrowed.

Rust

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

Correct.

Python

int result = 'value';

String result = 'value';

Type mismatch.

Dart

val bar: Int = 'info'

val bar: String = 'info'

Fix type.

Kotlin

List(16,48,34)

Correct.

Scala

const int x; x = 5;

const int x = 5;

Const must be initialized.

C++

["hello", 53]

Correct.

JSON

def render puts 'result' end

Correct.

Ruby

if (c = 98)

if (c == 98)

Use ==.

C++

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

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

Clone to avoid move.

Rust

Correct.

XML

System.out.println('result')

System.out.println('result');

Add semicolon.

Java

<center>output</center>

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

Use CSS.

HTML

function baz(): void {{ return 28; }}

function baz(): number {{ return 28; }}

Return type mismatch.

TypeScript

'output' + 63

'output' + str(63)

Can't add int to string.

Python

WHERE email = '37'

WHERE email = 37

Don't quote integer.

SQL

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

Correct.

Shell

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

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

Initialize variable.

Java

for i=1,23 do print(i) end

Correct.

Lua

<person><desc>test</desc><age>70</age></person

Add closing >.

XML

cin >> data cout << data;

cin >> data; cout << data;

Add semicolon.

C++

function process() {{ return {{key:'value'}} }}

function process() {{ return {{key:'value'}}; }}

Return object on same line.

JavaScript

const http = require('http'); http.createServer((req,res) => res.end('world')).listen(26);

Correct.

Node.js

{ "name": "world" }

Correct.

JSON

for (int i=0; i<62; i++) {{}}

Correct.

Java

function test(c:string){{return c;}} test(46);

function test(c:string){{return c;}} test('output');

Pass correct type.

TypeScript

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

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

Declare before use.

C++

Order.save();

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

Handle promise.

Node.js

x := 51

Correct.

Go

$x = 5; echo $x

$x = 5; echo $x;

Missing semicolon.

PHP

my @arr = (51,12,20);

Correct.

Perl

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

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

Close td.

HTML

const person:Person = {{name:'message'}};

const person:Person = {{name:'message', age:31}};

Add missing property.

TypeScript