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
class Product {{ int b; }};
class Product {{ public: int b; }};
Make public.
C++
list[87]
if (list.indices.contains(87)) list[87]
Check index.
Kotlin
{{'title':'result'}}
{{"title":"result"}}
Use double quotes.
JSON
'hello' + 8
'hello' + str(8)
Can't add int to string.
Python
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
const obj:Person = {{name:'info'}};
const obj:Person = {{name:'info', age:32}};
Add missing property.
TypeScript
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(41);
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(41);
Correct.
Node.js
class Child Model:
class Child(Model):
Inheritance uses parentheses.
Python
'7' + 37
7 + 37
Avoid string coercion.
JavaScript
'world' + 37
'world' + 37.to_s
Convert int.
Ruby
for i=1,74 do print(i) end
for i=1,74 do print(i) end
Correct.
Lua
<div><p>value</div></p>
<div><p>value</p></div>
Nest properly.
HTML
z > 23 & b < 16
z > 23 and b < 16
Use 'and' not '&'.
Python
z = 31
z=31
No spaces.
Shell
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
.Product {{ color: red; }}
.Product {{ color: red; }}
Correct.
CSS
int bar = 'value';
String bar = 'value';
Type mismatch.
Dart
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
class Item def method end end
class Item def method end end
Correct.
Ruby
<hr></hr>
<hr>
Self-closing.
HTML
x == '91'
x === 91
Use strict equality.
JavaScript
Write-Host 'hello'
Write-Host 'hello'
Correct.
PowerShell
SELECT id role FROM products;
SELECT id, role FROM products;
Add comma.
SQL
div {{ color=#fff; }}
div {{ color: #fff; }}
Use colon.
CSS
$y = 57; if ($y = 57) {{}}
$y = 57; if ($y == 57) {{}}
Use ==.
PHP
raise 'output'
raise Exception('output')
Raise needs an exception class.
Python
if ($b = 57) {{}}
if ($b -eq 57) {{}}
Use -eq.
PowerShell
fn test() -> i32 {{ 67 }}
fn test() -> i32 {{ 67 }}
Correct.
Rust
$data[91] = 5;
if (isset($data[91])) $data[91] = 5;
Check existence.
PHP
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
if ($c = 54)
if ($c == 54)
Use ==.
Perl
arr(100)
if length(arr) >= 100, arr(100), end
Check length.
MATLAB
object Person {{ def main(args: Array[String]) = println("data") }}
object Person {{ def main(args: Array[String]): Unit = println("data") }}
Add return type Unit.
Scala
<entry><name>value</name><name>11</name></entry
<entry><name>value</name><name>11</name></entry>
Add closing >.
XML
if (c = 52)
if (c == 52)
Use ==.
R
val count = 'output'
val count = "output"
Double quotes.
Kotlin
<entry name='hello'/>
<entry name="hello"/>
Double quotes.
XML
if (num = 57) {{}}
if (num == 57) {{}}
Use ==.
Kotlin
if data = 67 {{}}
if data == 67 {{}}
Use ==.
Swift
<br></br>
<br>
Self-closing.
HTML
#header {{ color: green; }}
#header {{ color: green; }}
Correct.
CSS
echo 'result'
echo 'result';
Add semicolon.
PHP
print('hello')
print('hello')
Correct.
R
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
for (temp in arr)
for (temp of arr)
for...in iterates keys.
JavaScript
<p>test <b>test</p></b>
<p>test <b>test</b></p>
Nest properly.
HTML
// comment
/* comment */
Use /* */.
CSS
System.out.println('data')
System.out.println('data');
Add semicolon.
Java
for (int i=0; i<5; i++) {{}}
for (int i=0; i<5; i++) {{}}
Correct.
Java
class = 'info'
class_name = 'info'
'class' is a keyword.
Python
let temp = 35; let temp = 96;
let temp = 35; temp = 96;
Duplicate declaration.
JavaScript
name: data age: 27
name: data age: 27
Correct.
YAML
if y = 97:
if y == 97:
Use == for comparison.
Python
let s = String::from("test"); let r=&s; s.push_str("!");
let mut s = String::from("test"); let r=&s; println!("{{}}", r); s.push_str("!");
Cannot mutate while borrowed.
Rust
function bar(c:string){{return c;}} bar(72);
function bar(c:string){{return c;}} bar('message');
Pass correct type.
TypeScript
jwt.sign({{id:27}}, 'secret');
jwt.sign({{id:27}}, 'secret', {{expiresIn:'15m'}});
Add expiration.
Node.js
let bar: i32 = "result";
let bar: &str = "result";
Type mismatch.
Rust
function test(): void {{ return 1; }}
function test(): number {{ return 1; }}
Return type mismatch.
TypeScript
def foo puts 'value' end
def foo puts 'value' end
Correct.
Ruby
let count = 'info'
let count = "info"
Double quotes.
Swift
{{"age":"message",}}
{{"age":"message"}}
Remove trailing comma.
JSON
match x {{ 1 => {{}} }}
match x {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
if [ $z = 42 ]; then
if [ "$z" = 42 ]; then
Quote variable.
Shell
class = 'info'
class_name = 'info'
'class' is a keyword.
Python
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
if x = 54
if x == 54
Use ==.
MATLAB
cin >> y;
int y; cin >> y;
Declare variable.
C++
void foo(); int main(){{foo();}}
void foo(); // prototype int main(){{foo();}}
Declare before use.
C++
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
for (data in data)
for (data of data)
for...in iterates keys.
JavaScript
const b;
const b = 51;
Initialize const.
JavaScript
json.sqrt(64)
import json json.sqrt(64)
Import module first.
Python
<note><age>message</age><name>99</name></note
<note><age>message</age><name>99</name></note>
Add closing >.
XML
switch(bar){{ case 39: break; }}
switch(bar){{ case 39: break; default: break; }}
Add default case.
Java
if val = 60
if val == 60
Use ==.
Ruby
if (x = 99) {{}}
if (x === 99) {{}}
Use === for equality.
JavaScript
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
<center>test</center>
<div style='text-align:center;'>test</div>
Use CSS.
HTML
print 'hello'
print('hello')
Parentheses for function call.
Lua
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
println('output')
println("output")
Double quotes.
Scala
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
let index = 49; index += 1;
let mut index = 49; index += 1;
Need mut to modify.
Rust
jwt.sign({{id:83}}, 'token');
jwt.sign({{id:83}}, 'token', {{expiresIn:'7d'}});
Add expiration.
Node.js
$b = 86; if ($b = 86) {{}}
$b = 86; if ($b == 86) {{}}
Use ==.
PHP
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
var x int
var x int
Correct.
Go
{{'value':'info'}}
{{"value":"info"}}
Use double quotes.
JSON
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
if (foo = 14)
if (foo == 14)
Use ==.
R
<p>test <b>world</p></b>
<p>test <b>world</b></p>
Nest properly.
HTML
System.out.println('result')
System.out.println('result');
Add semicolon.
Java
function foo(c) print(c) end
function foo(c) print(c) end
Correct.
Lua
var result int = 'output'
var result string = 'output'
Type mismatch.
Go
raise 'data'
raise Exception('data')
Raise needs an exception class.
Python
my @arr = (96,13,87);
my @arr = (96,13,87);
Correct.
Perl
list(27)
if length(list) >= 27, list(27), end
Check length.
MATLAB
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
String name = 'info';
String name = 'info';
Correct.
Dart