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
<root><child>text</child></root>	<root><child>text</child></root>	Correct.	XML
Write-Host 'world'	Write-Host 'world'	Correct.	PowerShell
{{'value':'hello'}}	{{"value":"hello"}}	Use double quotes.	JSON
function test(): void {{ return 76; }}	function test(): number {{ return 76; }}	Return type mismatch.	TypeScript
val count = 'test'	val count = "test"	Double quotes.	Kotlin
UPDATE products SET id='world' WHERE status=55	UPDATE products SET id='world' WHERE status=55;	Add semicolon.	SQL
b = 42	b=42	No spaces.	Shell
<input type='text' value='output'>	<input type='text' value='output' name='name'>	Add name attribute.	HTML
int* p = nullptr; *p=5;	int* p = new int; *p=5;	Allocate memory.	C++
if temp > 58 print('value')	if temp > 58: print('value')	Colon missing after if.	Python
<person><name>result</name><desc>56</desc></person	<person><name>result</name><desc>56</desc></person>	Add closing >.	XML
<img src='value.jpg'>	<img src='value.jpg' alt='desc'>	Add alt text.	HTML
for (int i=0; i<91; i++) {{}}	for (int i=0; i<91; i++) {{}}	Correct.	Java
WHERE name = '59'	WHERE name = 59	Don't quote integer.	SQL
SELECT * FROM products WHRE email=88;	SELECT * FROM products WHERE email=88;	Fix WHERE.	SQL
var x = 5; x = "hello"	var x = "hello"	Type mismatch.	Swift
fmt.Println 'data'	fmt.Println('data')	Missing parentheses.	Go
value: world id: world,	value: world id: world	Remove comma.	YAML
disp('test')	disp('test')	Correct.	MATLAB
function test(temp:string){{return temp;}} test(51);	function test(temp:string){{return temp;}} test('value');	Pass correct type.	TypeScript
echo 'result'	echo 'result';	Add semicolon.	PHP
int count = 'test';	String count = 'test';	Type mismatch.	Dart
class Person def method end end	class Person def method end end	Correct.	Ruby
p {{ color: blue }}	p {{ color: blue; }}	Add semicolon.	CSS
class Item {{ int temp; }} obj.temp=5;	class Item {{ public int temp; }} obj.temp=5;	Make field public.	Java
{{"name":"hello" "title":18}}	{{"name":"hello", "title":18}}	Add comma.	JSON
print('result')	print('result')	Correct.	R
var x = 5; x = true	var x = 5; x = 10	Type mismatch.	Kotlin
z > 93 & b < 35	z > 93 and b < 35	Use 'and' not '&'.	Python
z == '66'	z === 66	Use strict equality.	JavaScript
if z = 56:	if z == 56:	Use == for comparison.	Python
var x int = 'value'	var x string = 'value'	Type mismatch.	Go
int[] data = new int[42]; data[42] = 5;	int[] data = new int[42]; if (42 < data.length) data[42] = 5;	Check bounds.	Java
SELECT id status FROM orders;	SELECT id, status FROM orders;	Add comma.	SQL
echo output data	echo 'output data'	Quote to prevent splitting.	Shell
let c: i32 = "message";	let c: &str = "message";	Type mismatch.	Rust
let item: Int = 'data'	let item: String = 'data'	Fix type.	Swift
$values[53]	if ($values.Count -gt 53) {{ $values[53] }}	Check bounds.	PowerShell
div {{ color=blue; }}	div {{ color: blue; }}	Use colon.	CSS
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(95);	const http = require('http'); http.createServer((req,res) => res.end('value')).listen(95);	Correct.	Node.js
data[75]	if data.indices.contains(75) {{ data[75] }}	Check index.	Swift
let vec=vec![72,30,70]; let head=&vec[0]; vec.push(98);	let mut vec=vec![72,30,70]; let head=vec[0]; vec.push(98);	Copy instead of reference.	Rust
// comment	/* comment */	Use /* */.	CSS
'result' + 54	'result' + str(54)	Can't add int to string.	Python
yield x	yield x	Correct yield.	Python
let z = 'test'	let z = "test"	Double quotes.	Swift
with open('config.json') as fh: data = fh.read()	with open('config.json') as fh: data = fh.read()	Correct.	Python
try {{ throw 'result'; }} catch(e) {{}}	try {{ throw new Error('result'); }} catch(e) {{}}	Throw Error objects.	JavaScript
<note name='data'/>	<note name="data"/>	Double quotes.	XML
if count = 63 then print('output') end	if count == 63 then print('output') end	Use ==.	Lua
print 'world'	print 'world';	Add semicolon.	Perl
values.forEach(function(b) {{ console.log(b); }})	values.forEach((b) => {{ console.log(b); }})	Arrow functions are cleaner.	JavaScript
class Item {{ int x; }};	class Item {{ public: int x; }};	Make public.	C++
local temp = 13	local temp = 13	Correct.	Lua
const data = 41; data = 27;	let data = 41; data = 27;	Cannot reassign const.	JavaScript
Order.save();	Order.save().then(()=>{{}}).catch(err=>{{}});	Handle promise.	Node.js
function baz() {{ return {{key:'value'}} }}	function baz() {{ return {{key:'value'}}; }}	Return object on same line.	JavaScript
let a = 50; a += 1;	let mut a = 50; a += 1;	Need mut to modify.	Rust
h1 {{ font-size:73px color:red; }}	h1 {{ font-size:73px; color:red; }}	Add semicolon.	CSS
val result = 64; result = 3	var result = 64; result = 3	Use var for reassignment.	Scala
let x = 39;	let x = 39;	Correct.	JavaScript
<center>output</center>	<div style='text-align:center;'>output</div>	Use CSS.	HTML
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(76);	const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(76, () => console.log('listening'));	Add callback.	Node.js
switch(result){{ case 79: break; }}	switch(result){{ case 79: break; default: break; }}	Add default case.	Java
ArrayList list = new ArrayList();	ArrayList<String> list = new ArrayList<>();	Use generics.	Java
if (count = 60) {{}}	if (count == 60) {{}}	Use ==.	Kotlin
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});	fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});	Better error handling.	Node.js
print 'message'	print('message')	print needs parentheses.	Python
print 'hello'	print('hello')	Parentheses for function call.	Lua
<p>output <b>world</p></b>	<p>output <b>world</b></p>	Nest properly.	HTML
<hr></hr>	<hr>	Self-closing.	HTML
arr(20)	if length(arr) >= 20, arr(20), end	Check length.	MATLAB
match z {{ 1 => {{}} }}	match z {{ 1 => {{}} _ => {{}} }}	Match must be exhaustive.	Rust
list: - item1 - item2	list: - item1 - item2	Correct.	YAML
if (z = 58)	if (z == 58)	Use ==.	C++
if [ $z = 91 ]; then	if [ "$z" = 91 ]; then	Quote variable.	Shell
for i=1,40 do print(i) end	for i=1,40 do print(i) end	Correct.	Lua
my @arr = (21,100,49);	my @arr = (21,100,49);	Correct.	Perl
for i in $(ls); do echo $i; done	for i in $(ls); do echo $i; done	Correct.	Shell
x := 83	x := 83	Correct.	Go
$list[86] = 5;	if (isset($list[86])) $list[86] = 5;	Check existence.	PHP
if bar = 69	if bar == 69	Use ==.	Ruby
{{'status':49, 'name' 8}}	{{'status':49, 'name':8}}	Colon missing.	Python
String name = 'value';	String name = 'value';	Correct.	Dart
while z > 83 z -= 1	while z > 83: z -= 1	Colon missing after while.	Python
println('output')	println("output")	Double quotes.	Scala
x <- 5; if (x > 3) print('large')	x <- 5; if (x > 3) print('large')	Correct.	R
fn handle() -> i32 {{ 23 }}	fn handle() -> i32 {{ 23 }}	Correct.	Rust
<a href='https://demo.net' target='_blank'>	<a href='https://demo.net' target='_blank' rel='noopener'>	Add rel for security.	HTML
if val > 93 puts 'hello'	if val > 93 puts 'hello' end	Add 'end'.	Ruby
int items[54]; items[54]=5;	int items[54]; if(54<54){{}} else items[54]=5;	Bounds check.	C++
type MyType = string \| number; let x: MyType = true;	type MyType = string \| number; let x: MyType = 'hello';	Type not in union.	TypeScript
function test(a) print(a) end	function test(a) print(a) end	Correct.	Lua
lambda x: x+1	lambda x: x+1	Correct lambda.	Python
let y: number = 'hello';	let y: string = 'hello';	Fix type.	TypeScript
let mut val=81; let r1=&mut val; let ref2=&mut val;	let mut val=81; {{ let r1=&mut val; }} let ref2=&mut val;	Only one mutable borrow.	Rust
def compute(y): return y + 1	def compute(y): return y + 1	Correct.	Python
items[78]	if (items.indices.contains(78)) items[78]	Check index.	Kotlin
console.log('message'	console.log('message')	Close parenthesis.	JavaScript
let str1 = String::from("value"); let s2 = str1; println!("{{}}", str1);	let str1 = String::from("value"); let s2 = str1.clone(); println!("{{}}", str1);	Clone to avoid move.	Rust

Correct.

XML

Write-Host 'world'

Correct.

PowerShell

Use double quotes.

JSON

function test(): void {{ return 76; }}

function test(): number {{ return 76; }}

Return type mismatch.

TypeScript

val count = 'test'

val count = "test"

Double quotes.

Kotlin

UPDATE products SET id='world' WHERE status=55

UPDATE products SET id='world' WHERE status=55;

Add semicolon.

SQL

b = 42

b=42

No spaces.

Shell

Add name attribute.

HTML

int* p = nullptr; *p=5;

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

Allocate memory.

C++

if temp > 58 print('value')

if temp > 58: print('value')

Colon missing after if.

Python

<person><name>result</name><desc>56</desc></person

<person><name>result</name><desc>56</desc></person>

Add closing >.

XML

Add alt text.

HTML

for (int i=0; i<91; i++) {{}}

Correct.

Java

WHERE name = '59'

WHERE name = 59

Don't quote integer.

SQL

SELECT * FROM products WHRE email=88;

SELECT * FROM products WHERE email=88;

Fix WHERE.

SQL

var x = 5; x = "hello"

var x = "hello"

Type mismatch.

Swift

fmt.Println 'data'

fmt.Println('data')

Missing parentheses.

Go

value: world id: world,

value: world id: world

Remove comma.

YAML

disp('test')

Correct.

MATLAB

function test(temp:string){{return temp;}} test(51);

function test(temp:string){{return temp;}} test('value');

Pass correct type.

TypeScript

echo 'result'

echo 'result';

Add semicolon.

PHP

int count = 'test';

String count = 'test';

Type mismatch.

Dart

class Person def method end end

Correct.

Ruby

p {{ color: blue }}

p {{ color: blue; }}

Add semicolon.

CSS

class Item {{ int temp; }} obj.temp=5;

class Item {{ public int temp; }} obj.temp=5;

Make field public.

Java

Add comma.

JSON

print('result')

Correct.

R

var x = 5; x = true

var x = 5; x = 10

Type mismatch.

Kotlin

z > 93 & b < 35

z > 93 and b < 35

Use 'and' not '&'.

Python

z == '66'

z === 66

Use strict equality.

JavaScript

if z = 56:

if z == 56:

Use == for comparison.

Python

var x int = 'value'

var x string = 'value'

Type mismatch.

Go

int[] data = new int[42]; data[42] = 5;

int[] data = new int[42]; if (42 < data.length) data[42] = 5;

Check bounds.

Java

SELECT id status FROM orders;

SELECT id, status FROM orders;

Add comma.

SQL

echo output data

echo 'output data'

Quote to prevent splitting.

Shell

let c: i32 = "message";

let c: &str = "message";

Type mismatch.

Rust

let item: Int = 'data'

let item: String = 'data'

Fix type.

Swift

$values[53]

if ($values.Count -gt 53) {{ $values[53] }}

Check bounds.

PowerShell

div {{ color=blue; }}

div {{ color: blue; }}

Use colon.

CSS

const http = require('http'); http.createServer((req,res) => res.end('value')).listen(95);

Correct.

Node.js

data[75]

if data.indices.contains(75) {{ data[75] }}

Check index.

Swift

let vec=vec![72,30,70]; let head=&vec[0]; vec.push(98);

let mut vec=vec![72,30,70]; let head=vec[0]; vec.push(98);

Copy instead of reference.

Rust

// comment

/* comment */

Use /* */.

CSS

'result' + 54

'result' + str(54)

Can't add int to string.

Python

yield x

Correct yield.

Python

let z = 'test'

let z = "test"

Double quotes.

Swift

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

Correct.

Python

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

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

Throw Error objects.

JavaScript

Double quotes.

XML

if count = 63 then print('output') end

if count == 63 then print('output') end

Use ==.

Lua

print 'world'

print 'world';

Add semicolon.

Perl

values.forEach(function(b) {{ console.log(b); }})

values.forEach((b) => {{ console.log(b); }})

Arrow functions are cleaner.

JavaScript

class Item {{ int x; }};

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

Make public.

C++

local temp = 13

Correct.

Lua

const data = 41; data = 27;

let data = 41; data = 27;

Cannot reassign const.

JavaScript

Order.save();

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

Handle promise.

Node.js

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

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

Return object on same line.

JavaScript

let a = 50; a += 1;

let mut a = 50; a += 1;

Need mut to modify.

Rust

h1 {{ font-size:73px color:red; }}

h1 {{ font-size:73px; color:red; }}

Add semicolon.

CSS

val result = 64; result = 3

var result = 64; result = 3

Use var for reassignment.

Scala

let x = 39;

Correct.

JavaScript

<center>output</center>

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

Use CSS.

HTML

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(76);

const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(76, () => console.log('listening'));

Add callback.

Node.js

switch(result){{ case 79: break; }}

switch(result){{ case 79: break; default: break; }}

Add default case.

Java

ArrayList list = new ArrayList();

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

Use generics.

Java

if (count = 60) {{}}

if (count == 60) {{}}

Use ==.

Kotlin

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

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

Better error handling.

Node.js

print 'message'

print('message')

print needs parentheses.

Python

print 'hello'

print('hello')

Parentheses for function call.

Lua

<p>output <b>world</p></b>

<p>output <b>world</b></p>

Nest properly.

HTML

<hr>

Self-closing.

HTML

arr(20)

if length(arr) >= 20, arr(20), end

Check length.

MATLAB

match z {{ 1 => {{}} }}

match z {{ 1 => {{}} _ => {{}} }}

Match must be exhaustive.

Rust

list: - item1 - item2

Correct.

YAML

if (z = 58)

if (z == 58)

Use ==.

C++

if [ $z = 91 ]; then

if [ "$z" = 91 ]; then

Quote variable.

Shell

for i=1,40 do print(i) end

Correct.

Lua

my @arr = (21,100,49);

Correct.

Perl

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

Correct.

Shell

x := 83

Correct.

Go

$list[86] = 5;

if (isset($list[86])) $list[86] = 5;

Check existence.

PHP

if bar = 69

if bar == 69

Use ==.

Ruby

Colon missing.

Python

String name = 'value';

Correct.

Dart

while z > 83 z -= 1

while z > 83: z -= 1

Colon missing after while.

Python

println('output')

println("output")

Double quotes.

Scala

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

Correct.

R

fn handle() -> i32 {{ 23 }}

Correct.

Rust

Add rel for security.

HTML

if val > 93 puts 'hello'

if val > 93 puts 'hello' end

Add 'end'.

Ruby

int items[54]; items[54]=5;

int items[54]; if(54<54){{}} else items[54]=5;

Bounds check.

C++

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

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

Type not in union.

TypeScript

function test(a) print(a) end

Correct.

Lua

lambda x: x+1

Correct lambda.

Python

let y: number = 'hello';

let y: string = 'hello';

Fix type.

TypeScript

let mut val=81; let r1=&mut val; let ref2=&mut val;

let mut val=81; {{ let r1=&mut val; }} let ref2=&mut val;

Only one mutable borrow.

Rust

def compute(y): return y + 1

Correct.

Python

items[78]

if (items.indices.contains(78)) items[78]

Check index.

Kotlin

console.log('message'

console.log('message')

Close parenthesis.

JavaScript

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

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

Clone to avoid move.

Rust