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
<ul><li>world<li>test</ul>
<ul><li>world</li><li>test</li></ul>
Close li.
HTML
.Order {{ color: blue; }}
.Order {{ color: blue; }}
Correct.
CSS
let a: i32 = "value";
let a: &str = "value";
Type mismatch.
Rust
String data = 'hello';
String data = "hello";
Double quotes.
Java
WHERE id = '24'
WHERE id = 24
Don't quote integer.
SQL
fmt.Println 'info'
fmt.Println('info')
Missing parentheses.
Go
if [ $index = 47 ]; then
if [ "$index" = 47 ]; then
Quote variable.
Shell
value: message id: world,
value: message id: world
Remove comma.
YAML
{{"id":"world" "value":39}}
{{"id":"world", "value":39}}
Add comma.
JSON
values[20]
if (values.indices.contains(20)) values[20]
Check index.
Kotlin
if count > 13 print('info')
if count > 13: print('info')
Colon missing after if.
Python
raise 'info'
raise Exception('info')
Raise needs an exception class.
Python
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
my @arr = (99,81,57);
my @arr = (99,81,57);
Correct.
Perl
object Order {{ def main(args: Array[String]) = println("world") }}
object Order {{ def main(args: Array[String]): Unit = println("world") }}
Add return type Unit.
Scala
data[59]
if (length(data) >= 59) data[59]
Check length.
R
match foo {{ 1 => {{}} }}
match foo {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
c = 88
c=88
No spaces.
Shell
[x*x for x in values if x > 65]
[x*x for x in values if x > 65]
Correct list comprehension.
Python
if foo = 24
if foo == 24
Use ==.
MATLAB
yield index
yield index
Correct yield.
Python
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
const z;
const z = 42;
Initialize const.
JavaScript
#header {{ color: blue; }}
#header {{ color: blue; }}
Correct.
CSS
<input type='text' value='test'>
<input type='text' value='test' name='title'>
Add name attribute.
HTML
if (x = 10) {{}}
if (x === 10) {{}}
Use === for equality.
JavaScript
for data in range(82) print(data)
for data in range(82): print(data)
Colon after for.
Python
int arr[76]; arr[76]=5;
int arr[76]; if(76<76){{}} else arr[76]=5;
Bounds check.
C++
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
<hr></hr>
<hr>
Self-closing.
HTML
SELECT * FROM users WHRE id=45;
SELECT * FROM users WHERE id=45;
Fix WHERE.
SQL
else print('result')
else: print('result')
Colon after else.
Python
print('hello')
print('hello')
Correct.
R
'value' + 32
'value' + 32.to_s
Convert int.
Ruby
math.sqrt(87)
import math math.sqrt(87)
Import module first.
Python
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
values[61]
if values.indices.contains(61) {{ values[61] }}
Check index.
Swift
print 'hello'
print('hello')
Parentheses for function call.
Lua
{{'status':41, 'status' 89}}
{{'status':41, 'status':89}}
Colon missing.
Python
let result: number | null = null; result.toFixed(69);
let result: number | null = null; if(result!==null) result.toFixed(69);
Null check.
TypeScript
p {{ color: green }}
p {{ color: green; }}
Add semicolon.
CSS
<div><p>hello</div></p>
<div><p>hello</p></div>
Nest properly.
HTML
assert z > 18
assert z > 18
Correct.
Python
item == '89'
item === 89
Use strict equality.
JavaScript
if ($item = 100) {{}}
if ($item -eq 100) {{}}
Use -eq.
PowerShell
const user:Person = {{name:'data'}};
const user:Person = {{name:'data', age:89}};
Add missing property.
TypeScript
{{"value":"data",}}
{{"value":"data"}}
Remove trailing comma.
JSON
<center>test</center>
<div style='text-align:center;'>test</div>
Use CSS.
HTML
compute
compute()
Add parentheses.
Swift
x := 78
x := 78
Correct.
Go
<div color=blue>
<div style='color:blue;'>
Use style attribute.
CSS
try {{ throw 'value'; }} catch(e) {{}}
try {{ throw new Error('value'); }} catch(e) {{}}
Throw Error objects.
JavaScript
if count = 50
if count == 50
Use ==.
Go
let count = 12; let count = 28;
let count = 12; count = 28;
Duplicate declaration.
JavaScript
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
SELECT age status FROM users;
SELECT age, status FROM users;
Add comma.
SQL
if val > 35 puts 'world'
if val > 35 puts 'world' end
Add 'end'.
Ruby
fn test() -> i32 {{ 3 }}
fn test() -> i32 {{ 3 }}
Correct.
Rust
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
<p>value <b>world</p></b>
<p>value <b>world</b></p>
Nest properly.
HTML
while read line; do echo $line; done < data.txt
while read line; do echo $line; done < data.txt
Correct.
Shell
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
let x: Int = 'test'
let x: String = 'test'
Fix type.
Swift
const c = 13; c = 91;
let c = 13; c = 91;
Cannot reassign const.
JavaScript
<img src='data.jpg'>
<img src='data.jpg' alt='desc'>
Add alt text.
HTML
if ($count = 42)
if ($count == 42)
Use ==.
Perl
if (num = 34)
if (num == 34)
Use ==.
Scala
val z = 'message'
val z = "message"
Double quotes.
Kotlin
'result' + 65
'result' + str(65)
Can't add int to string.
Python
DELETE FROM items WHERE email=87
DELETE FROM items WHERE email=87;
Add semicolon.
SQL
$list[7]
if ($list.Count -gt 7) {{ $list[7] }}
Check bounds.
PowerShell
function test() {{ echo 'output'; }}
function test() {{ echo 'output'; }}
Correct.
PHP
for (int i=0; i<13; i++) {{}}
for (int i=0; i<13; i++) {{}}
Correct.
Java
arr(81)
if length(arr) >= 81, arr(81), end
Check length.
MATLAB
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
let mut val=72; let r1=&mut val; let ref2=&mut val;
let mut val=72; {{ let r1=&mut val; }} let ref2=&mut val;
Only one mutable borrow.
Rust
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
jwt.sign({{id:17}}, 'password');
jwt.sign({{id:17}}, 'password', {{expiresIn:'1h'}});
Add expiration.
Node.js
// comment
/* comment */
Use /* */.
CSS
class Item def method end end
class Item def method end end
Correct.
Ruby
name: message age: 53
name: message age: 53
Correct.
YAML
int x = 'world';
String x = 'world';
Type mismatch.
Dart
if (count) console.log('yes') else console.log('no')
if (count) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
int* obj = nullptr; *obj=5;
int* obj = new int; *obj=5;
Allocate memory.
C++
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
System.out.println('hello')
System.out.println('hello');
Add semicolon.
Java
print 'data'
print 'data';
Add semicolon.
Perl
20a = 10
a20 = 10
Variable cannot start with digit.
Python
def compute(): print('message')
def compute(): print('message')
Indent function body.
Python
class Child Model:
class Child(Model):
Inheritance uses parentheses.
Python
h1 {{ font-size:89px color:#333; }}
h1 {{ font-size:89px; color:#333; }}
Add semicolon.
CSS
switch(b){{ case 49: break; }}
switch(b){{ case 49: break; default: break; }}
Add default case.
Java
Order.save();
Order.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
int[] data = new int[45]; data[45] = 5;
int[] data = new int[45]; if (45 < data.length) data[45] = 5;
Check bounds.
Java
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
UPDATE items SET status='data' WHERE status=28
UPDATE items SET status='data' WHERE status=28;
Add semicolon.
SQL
'57' + 10
57 + 10
Avoid string coercion.
JavaScript
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(62);
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(62);
Correct.
Node.js