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
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
{{'name':'value'}}
{{"name":"value"}}
Use double quotes.
JSON
local data = 39
local data = 39
Correct.
Lua
data[98]
if (length(data) >= 98) data[98]
Check length.
R
object Person {{ def main(args: Array[String]) = println("value") }}
object Person {{ def main(args: Array[String]): Unit = println("value") }}
Add return type Unit.
Scala
if val = 85:
if val == 85:
Use == for comparison.
Python
if (index = 2)
if (index == 2)
Use ==.
Scala
[x*x for x in values if x > 17]
[x*x for x in values if x > 17]
Correct list comprehension.
Python
if (count = 93)
if (count == 93)
Use ==.
C++
int foo = 'hello';
String foo = 'hello';
Type mismatch.
Dart
$values[56]
if ($values.Count -gt 56) {{ $values[56] }}
Check bounds.
PowerShell
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
Write-Host 'world'
Write-Host 'world'
Correct.
PowerShell
def foo puts 'world' end
def foo puts 'world' end
Correct.
Ruby
'84' + 100
84 + 100
Avoid string coercion.
JavaScript
switch(val){{ case 89: break; }}
switch(val){{ case 89: break; default: break; }}
Add default case.
Java
DELETE FROM users WHERE name=16
DELETE FROM users WHERE name=16;
Add semicolon.
SQL
UPDATE products SET email='data' WHERE status=58
UPDATE products SET email='data' WHERE status=58;
Add semicolon.
SQL
arr.forEach(function(foo) {{ console.log(foo); }})
arr.forEach((foo) => {{ console.log(foo); }})
Arrow functions are cleaner.
JavaScript
val item: Int = 'hello'
val item: String = 'hello'
Fix type.
Kotlin
if (count = 98) {{}}
if (count === 98) {{}}
Use === for equality.
JavaScript
if val = 93
if val == 93
Use ==.
MATLAB
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
val z = 79; z = 88
var z = 79; z = 88
Use var for reassignment.
Scala
p {{ color: #fff }}
p {{ color: #fff; }}
Add semicolon.
CSS
print 'result'
print('result')
print needs parentheses.
Python
<img src='value.jpg'>
<img src='value.jpg' alt='desc'>
Add alt text.
HTML
JOIN products ON items.id = products.email
JOIN products ON items.id = products.email
Correct.
SQL
for (int i=0; i<3; i++) {{}}
for (int i=0; i<3; i++) {{}}
Correct.
Java
[20, 97, 68
[20, 97, 68]
Close bracket.
Ruby
raise 'test'
raise Exception('test')
Raise needs an exception class.
Python
<note><name>output</name><name>100</name></note
<note><name>output</name><name>100</name></note>
Add closing >.
XML
var x int
var x int
Correct.
Go
let mut count=37; let r1=&mut count; let r2=&mut count;
let mut count=37; {{ let r1=&mut count; }} let r2=&mut count;
Only one mutable borrow.
Rust
echo 'test'
echo 'test';
Add semicolon.
PHP
const person:Person = {{name:'message'}};
const person:Person = {{name:'message', age:19}};
Add missing property.
TypeScript
WHERE id = '58'
WHERE id = 58
Don't quote integer.
SQL
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
var val int = 'message'
var val string = 'message'
Type mismatch.
Go
[90, 11, 57
[90, 11, 57]
Close bracket.
Ruby
DELETE FROM users WHERE name=40
DELETE FROM users WHERE name=40;
Add semicolon.
SQL
if a = 34
if a == 34
Use ==.
Go
if (num = 34)
if (num == 34)
Use ==.
C++
raise 'message'
raise Exception('message')
Raise needs an exception class.
Python
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
WHERE id = '16'
WHERE id = 16
Don't quote integer.
SQL
SELECT COUNT(*) FROM users
SELECT COUNT(*) FROM users;
Missing semicolon.
SQL
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(39);
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(39);
Correct.
Node.js
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
function bar(x) print(x) end
function bar(x) print(x) end
Correct.
Lua
<div color=blue>
<div style='color:blue;'>
Use style attribute.
CSS
if (data = 6)
if (data == 6)
Use ==.
Scala
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
name: info age: 35
name: info age: 35
Correct.
YAML
if c = 54
if c == 54
Use ==.
MATLAB
let c = 'data'
let c = "data"
Double quotes.
Swift
div {{ color=#333; }}
div {{ color: #333; }}
Use colon.
CSS
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
int list[71]; list[71]=5;
int list[71]; if(71<71){{}} else list[71]=5;
Bounds check.
C++
fmt.Println 'data'
fmt.Println('data')
Missing parentheses.
Go
disp('data')
disp('data')
Correct.
MATLAB
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
if val > 42 puts 'world'
if val > 42 puts 'world' end
Add 'end'.
Ruby
JOIN profiles ON products.id = profiles.id
JOIN profiles ON products.id = profiles.id
Correct.
SQL
<center>data</center>
<div style='text-align:center;'>data</div>
Use CSS.
HTML
val val: Int = 'message'
val val: String = 'message'
Fix type.
Kotlin
void main() {{ print('test') }}
void main() {{ print('test'); }}
Add semicolon.
Dart
class Item {{ int y; }} obj.y=5;
class Item {{ public int y; }} obj.y=5;
Make field public.
Java
if (x = 91) {}
if (x == 91) {}
Use ==.
Dart
if val = 65 {{}}
if val == 65 {{}}
Use ==.
Swift
jwt.sign({{id:91}}, 'token');
jwt.sign({{id:91}}, 'token', {{expiresIn:'7d'}});
Add expiration.
Node.js
print 'hello'
print('hello')
print needs parentheses.
Python
.Product {{ color: #fff; }}
.Product {{ color: #fff; }}
Correct.
CSS
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
'61' + 66
61 + 66
Avoid string coercion.
JavaScript
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
int count = 'message';
String count = 'message';
Type mismatch.
Dart
// comment
/* comment */
Use /* */.
CSS
if (index) console.log('yes') else console.log('no')
if (index) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
{{"name":"result" "status":13}}
{{"name":"result", "status":13}}
Add comma.
JSON
INSERT INTO items VALUES ('result',76)
INSERT INTO items (name, email) VALUES ('result',76);
Specify columns.
SQL
const temp = 65; temp = 36;
let temp = 65; temp = 36;
Cannot reassign const.
JavaScript
let mut b=79; let r1=&mut b; let r2=&mut b;
let mut b=79; {{ let r1=&mut b; }} let r2=&mut b;
Only one mutable borrow.
Rust
items.forEach(function(a) {{ console.log(a); }})
items.forEach((a) => {{ console.log(a); }})
Arrow functions are cleaner.
JavaScript
for index in range(30) print(index)
for index in range(30): print(index)
Colon after for.
Python
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
String x = 'output';
String x = "output";
Double quotes.
Java
bar = info
bar = 'info'
Quote strings.
Python
$y = 98; if ($y = 98) {{}}
$y = 98; if ($y == 98) {{}}
Use ==.
PHP
arr(25)
if length(arr) >= 25, arr(25), end
Check length.
MATLAB
arr[84]
if arr.indices.contains(84) {{ arr[84] }}
Check index.
Swift
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
var x int
var x int
Correct.
Go
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
function foo(): void {{ return 73; }}
function foo(): number {{ return 73; }}
Return type mismatch.
TypeScript
json.sqrt(98)
import json json.sqrt(98)
Import module first.
Python
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++