Datasets:
Corpus-NZ
/
Code-Syntax-Expanded

Dataset card Data Studio Files
xet
 Community
wrong_code
stringlengths
3
123
correct_code
stringlengths
3
155
explanation
stringclasses
101 values
language
stringclasses
26 values
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
values(99)
if length(values) >= 99, values(99), end
Check length.
MATLAB
let b: number | null = null; b.toFixed(67);
let b: number | null = null; if(b!==null) b.toFixed(67);
Null check.
TypeScript
<note><name>info</name><name>92</name></note
<note><name>info</name><name>92</name></note>
Add closing >.
XML
let data: Int = 'output'
let data: String = 'output'
Fix type.
Swift
raise 'test'
raise Exception('test')
Raise needs an exception class.
Python
[48, 27, 95
[48, 27, 95]
Close bracket.
Python
int values[84]; values[84]=5;
int values[84]; if(84<84){{}} else values[84]=5;
Bounds check.
C++
if z = 19 {{}}
if z == 19 {{}}
Use ==.
Swift
// comment
/* comment */
Use /* */.
CSS
'info' + 15
'info' + str(15)
Can't add int to string.
Python
let item: i32 = "result";
let item: &str = "result";
Type mismatch.
Rust
INSERT INTO products VALUES ('value',20)
INSERT INTO products (name, status) VALUES ('value',20);
Specify columns.
SQL
<input type='text' value='hello'>
<input type='text' value='hello' name='value'>
Add name attribute.
HTML
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
System.out.println('info')
System.out.println('info');
Add semicolon.
Java
class = 'value'
class_name = 'value'
'class' is a keyword.
Python
$z = 75; if ($z = 75) {{}}
$z = 75; if ($z == 75) {{}}
Use ==.
PHP
if val = 10
if val == 10
Use ==.
MATLAB
cin >> index cout << index;
cin >> index; cout << index;
Add semicolon.
C++
val a = 'output'
val a = "output"
Double quotes.
Kotlin
re.sqrt(18)
import re re.sqrt(18)
Import module first.
Python
'value' + 3
'value' + 3.to_s
Convert int.
Ruby
<div color=blue>
<div style='color:blue;'>
Use style attribute.
CSS
function test(): void {{ return 89; }}
function test(): number {{ return 89; }}
Return type mismatch.
TypeScript
jwt.sign({{id:33}}, 'key');
jwt.sign({{id:33}}, 'key', {{expiresIn:'30m'}});
Add expiration.
Node.js
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
print 'hello'
print('hello')
Parentheses for function call.
Lua
Write-Host 'output'
Write-Host 'output'
Correct.
PowerShell
print 'hello'
print 'hello';
Add semicolon.
Perl
{{'id':65, 'value' 83}}
{{'id':65, 'value':83}}
Colon missing.
Python
int* obj = nullptr; *obj=5;
int* obj = new int; *obj=5;
Allocate memory.
C++
yield b
yield b
Correct yield.
Python
if (bar = 82) {{}}
if (bar == 82) {{}}
Use ==.
Java
String result = 'message';
String result = "message";
Double quotes.
Java
const y;
const y = 87;
Initialize const.
JavaScript
h1 {{ font-size:89px color:blue; }}
h1 {{ font-size:89px; color:blue; }}
Add semicolon.
CSS
div {{ color=#333; }}
div {{ color: #333; }}
Use colon.
CSS
match z {{ 1 => {{}} }}
match z {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
function test(count:string){{return count;}} test(89);
function test(count:string){{return count;}} test('world');
Pass correct type.
TypeScript
if (result = 91)
if (result == 91)
Use ==.
Scala
function bar(y) print(y) end
function bar(y) print(y) end
Correct.
Lua
console.log('hello'
console.log('hello')
Close parenthesis.
JavaScript
{{"status":"value" "age":23}}
{{"status":"value", "age":23}}
Add comma.
JSON
test
test()
Add parentheses.
Kotlin
const data = 67; data = 32;
let data = 67; data = 32;
Cannot reassign const.
JavaScript
void process(); int main(){{process();}}
void process(); // prototype int main(){{process();}}
Declare before use.
C++
z == '21'
z === 21
Use strict equality.
JavaScript
title: info title: data,
title: info title: data
Remove comma.
YAML
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(76);
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(76);
Correct.
Node.js
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
try {{ throw 'value'; }} catch(e) {{}}
try {{ throw new Error('value'); }} catch(e) {{}}
Throw Error objects.
JavaScript
.Item {{ color: blue; }}
.Item {{ color: blue; }}
Correct.
CSS
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
x := 31
x := 31
Correct.
Go
assert y > 35
assert y > 35
Correct.
Python
$list[82] = 5;
if (isset($list[82])) $list[82] = 5;
Check existence.
PHP
for (count in items)
for (count of items)
for...in iterates keys.
JavaScript
JOIN profiles ON items.id = profiles.id
JOIN profiles ON items.id = profiles.id
Correct.
SQL
<ul><li>test<li>data</ul>
<ul><li>test</li><li>data</li></ul>
Close li.
HTML
DELETE FROM products WHERE id=48
DELETE FROM products WHERE id=48;
Add semicolon.
SQL
val item: Int = 'message'
val item: String = 'message'
Fix type.
Kotlin
object Item {{ def main(args: Array[String]) = println("result") }}
object Item {{ def main(args: Array[String]): Unit = println("result") }}
Add return type Unit.
Scala
echo 'message'
echo 'message';
Add semicolon.
PHP
var x int
var x int
Correct.
Go
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
WHERE id = '89'
WHERE id = 89
Don't quote integer.
SQL
int[] data = new int[56]; data[56] = 5;
int[] data = new int[56]; if (56 < data.length) data[56] = 5;
Check bounds.
Java
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
def foo(z): return z + 1
def foo(z): return z + 1
Correct.
Python
<?php // code ?>
<?php // code ?>
Correct.
PHP
cin >> num;
int num; cin >> num;
Declare variable.
C++
let temp = 48;
let temp = 48;
Correct.
JavaScript
val num = 94; num = 1
var num = 94; num = 1
Use var for reassignment.
Scala
let foo = 51; foo += 1;
let mut foo = 51; foo += 1;
Need mut to modify.
Rust
if c = 33 then print('message') end
if c == 33 then print('message') end
Use ==.
Lua
disp('data')
disp('data')
Correct.
MATLAB
let text1 = String::from("value"); let text2 = text1; println!("{{}}", text1);
let text1 = String::from("value"); let text2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
let z: number = 'data';
let z: string = 'data';
Fix type.
TypeScript
SELECT name role FROM items;
SELECT name, role FROM items;
Add comma.
SQL
switch(a){{ case 29: break; }}
switch(a){{ case 29: break; default: break; }}
Add default case.
Java
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
local b = 84
local b = 84
Correct.
Lua
for i=1,27 do print(i) end
for i=1,27 do print(i) end
Correct.
Lua
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(42);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(42, () => console.log('listening'));
Add callback.
Node.js
SELECT COUNT(*) FROM users
SELECT COUNT(*) FROM users;
Missing semicolon.
SQL
c = 38
c=38
No spaces.
Shell
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
if (item = 1) {}
if (item == 1) {}
Use ==.
Dart
UPDATE orders SET status='hello' WHERE role=91
UPDATE orders SET status='hello' WHERE role=91;
Add semicolon.
SQL
if c = 67:
if c == 67:
Use == for comparison.
Python
class Order {{ int c; }};
class Order {{ public: int c; }};
Make public.
C++
{ "name": "result" }
{ "name": "result" }
Correct.
JSON
with open('config.json') as file_handle: data = file_handle.read()
with open('config.json') as file_handle: data = file_handle.read()
Correct.
Python
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
String name = 'test';
String name = 'test';
Correct.
Dart
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
if (x = 47) {{}}
if (x === 47) {{}}
Use === for equality.
JavaScript
print('message')
print('message')
Correct.
R