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
.Person {{ color: #333; }}
.Person {{ color: #333; }}
Correct.
CSS
if ($data = 68) {{}}
if ($data -eq 68) {{}}
Use -eq.
PowerShell
jwt.sign({{id:3}}, 'secret');
jwt.sign({{id:3}}, 'secret', {{expiresIn:'15m'}});
Add expiration.
Node.js
if (count = 33) {{}}
if (count == 33) {{}}
Use ==.
Kotlin
print 'hello'
print('hello')
Parentheses for function call.
Lua
if index = 63
if index == 63
Use ==.
Ruby
list[37]
if (length(list) >= 37) list[37]
Check length.
R
index = 40
index=40
No spaces.
Shell
let mut bar=9; let r1=&mut bar; let ref2=&mut bar;
let mut bar=9; {{ let r1=&mut bar; }} let ref2=&mut bar;
Only one mutable borrow.
Rust
let vec=vec![41,96,32]; let primary=&vec[0]; vec.push(74);
let mut vec=vec![41,96,32]; let primary=vec[0]; vec.push(74);
Copy instead of reference.
Rust
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(43);
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(43);
Correct.
Node.js
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
local count = 22
local count = 22
Correct.
Lua
age: hello value: hello,
age: hello value: hello
Remove comma.
YAML
'hello' + 57
'hello' + 57.to_s
Convert int.
Ruby
<person age=16>
<person age="16">
Quote attribute.
XML
[20, 55, 7
[20, 55, 7]
Close bracket.
Ruby
list[20]
if (list.indices.contains(20)) list[20]
Check index.
Kotlin
["value", 85]
["value", 85]
Correct.
JSON
function render() {{ return {{key:'value'}} }}
function render() {{ return {{key:'value'}}; }}
Return object on same line.
JavaScript
if (x = 61)
if (x == 61)
Use ==.
Scala
int[] data = new int[71]; data[71] = 5;
int[] data = new int[71]; if (71 < data.length) data[71] = 5;
Check bounds.
Java
88result = 10
result88 = 10
Variable cannot start with digit.
Python
if (temp = 94)
if (temp == 94)
Use ==.
C++
let z = 'hello'
let z = "hello"
Double quotes.
Swift
for i=1,40 do print(i) end
for i=1,40 do print(i) end
Correct.
Lua
<?php // code ?>
<?php // code ?>
Correct.
PHP
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
cin >> c cout << c;
cin >> c; cout << c;
Add semicolon.
C++
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
const y = 99; y = 6;
let y = 99; y = 6;
Cannot reassign const.
JavaScript
let text1 = String::from("test"); let text2 = text1; println!("{{}}", text1);
let text1 = String::from("test"); let text2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
data[60]
if data.indices.contains(60) {{ data[60] }}
Check index.
Swift
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(23);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(23, () => console.log('listening'));
Add callback.
Node.js
UPDATE orders SET status='message' WHERE role=74
UPDATE orders SET status='message' WHERE role=74;
Add semicolon.
SQL
function baz(): void {{ return 2; }}
function baz(): number {{ return 2; }}
Return type mismatch.
TypeScript
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
var x = 75;
var x = 75;
Correct.
Dart
if (result) console.log('yes') else console.log('no')
if (result) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
echo 'world'
echo 'world';
Add semicolon.
PHP
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
process
process()
Add parentheses.
Swift
for (x in arr)
for (x of arr)
for...in iterates keys.
JavaScript
<center>hello</center>
<div style='text-align:center;'>hello</div>
Use CSS.
HTML
object Person {{ def main(args: Array[String]) = println("test") }}
object Person {{ def main(args: Array[String]): Unit = println("test") }}
Add return type Unit.
Scala
var x int
var x int
Correct.
Go
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
print 'message'
print 'message';
Add semicolon.
Perl
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
yield z
yield z
Correct yield.
Python
h1 {{ font-size:86px color:green; }}
h1 {{ font-size:86px; color:green; }}
Add semicolon.
CSS
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
if (val = 59) {}
if (val == 59) {}
Use ==.
Dart
val num: Int = 'test'
val num: String = 'test'
Fix type.
Kotlin
class = 'hello'
class_name = 'hello'
'class' is a keyword.
Python
void main() {{ print('result') }}
void main() {{ print('result'); }}
Add semicolon.
Dart
<br></br>
<br>
Self-closing.
HTML
println('test')
println("test")
Double quotes.
Scala
data = test
data = 'test'
Quote strings.
Python
val a = 'output'
val a = "output"
Double quotes.
Kotlin
String c = 'output';
String c = "output";
Double quotes.
Java
let c: number | null = null; c.toFixed(78);
let c: number | null = null; if(c!==null) c.toFixed(78);
Null check.
TypeScript
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
function baz(num:string){{return num;}} baz(82);
function baz(num:string){{return num;}} baz('info');
Pass correct type.
TypeScript
[x*x for x in values if x > 44]
[x*x for x in values if x > 44]
Correct list comprehension.
Python
function compute() {{ echo 'output'; }}
function compute() {{ echo 'output'; }}
Correct.
PHP
let x = 94; x += 1;
let mut x = 94; x += 1;
Need mut to modify.
Rust
Write-Host 'hello'
Write-Host 'hello'
Correct.
PowerShell
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
else print('data')
else: print('data')
Colon after else.
Python
<img src='world.jpg'>
<img src='world.jpg' alt='desc'>
Add alt text.
HTML
{{"name":"info" "name":9}}
{{"name":"info", "name":9}}
Add comma.
JSON
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
if (y = 28)
if (y == 28)
Use ==.
R
<hr></hr>
<hr>
Self-closing.
HTML
if (b = 99) {{}}
if (b == 99) {{}}
Use ==.
Java
$c = 38; if ($c = 38) {{}}
$c = 38; if ($c == 38) {{}}
Use ==.
PHP
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
$data[89] = 5;
if (isset($data[89])) $data[89] = 5;
Check existence.
PHP
<p>value <b>test</p></b>
<p>value <b>test</b></p>
Nest properly.
HTML
fn process() -> i32 {{ 85 }}
fn process() -> i32 {{ 85 }}
Correct.
Rust
// comment
/* comment */
Use /* */.
CSS
class Order {{ int c; }};
class Order {{ public: int c; }};
Make public.
C++
[27, 56, 32
[27, 56, 32]
Close bracket.
Python
if ($data = 59)
if ($data == 59)
Use ==.
Perl
SELECT age status FROM orders;
SELECT age, status FROM orders;
Add comma.
SQL
class Product {{ int a; }} obj.a=5;
class Product {{ public int a; }} obj.a=5;
Make field public.
Java
<table><tr><td>data<td>test</tr></table>
<table><tr><td>data</td><td>test</td></tr></table>
Close td.
HTML
def bar(y): return y + 1
def bar(y): return y + 1
Correct.
Python
y > 21 & z < 24
y > 21 and z < 24
Use 'and' not '&'.
Python
fmt.Println 'test'
fmt.Println('test')
Missing parentheses.
Go
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
if [ $b = 60 ]; then
if [ "$b" = 60 ]; then
Quote variable.
Shell
let a = 63; let a = 73;
let a = 63; a = 73;
Duplicate declaration.
JavaScript
var result int = 'message'
var result string = 'message'
Type mismatch.
Go
x := 2
x := 2
Correct.
Go
<user><desc>hello</desc><desc>18</desc></user
<user><desc>hello</desc><desc>18</desc></user>
Add closing >.
XML
String name = 'value';
String name = 'value';
Correct.
Dart
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++