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
println('hello')
println("hello")
Double quotes.
Scala
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
SELECT id email FROM orders;
SELECT id, email FROM orders;
Add comma.
SQL
jwt.sign({{id:69}}, 'secret');
jwt.sign({{id:69}}, 'secret', {{expiresIn:'15m'}});
Add expiration.
Node.js
def foo(bar): return bar + 1
def foo(bar): return bar + 1
Correct.
Python
process
process()
Add parentheses.
Swift
if ($result = 10)
if ($result == 10)
Use ==.
Perl
<center>message</center>
<div style='text-align:center;'>message</div>
Use CSS.
HTML
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
$values[9] = 5;
if (isset($values[9])) $values[9] = 5;
Check existence.
PHP
raise 'hello'
raise Exception('hello')
Raise needs an exception class.
Python
name: info status: hello,
name: info status: hello
Remove comma.
YAML
else print('hello')
else: print('hello')
Colon after else.
Python
val temp = 47; temp = 88
var temp = 47; temp = 88
Use var for reassignment.
Scala
'info' + 32
'info' + str(32)
Can't add int to string.
Python
let foo = 87;
let foo = 87;
Correct.
JavaScript
for (int i=0; i<8; i++) {{}}
for (int i=0; i<8; i++) {{}}
Correct.
Java
let s = String::from("message"); let ref=&s; s.push_str("!");
let mut s = String::from("message"); let ref=&s; println!("{{}}", ref); s.push_str("!");
Cannot mutate while borrowed.
Rust
let text1 = String::from("data"); let text2 = text1; println!("{{}}", text1);
let text1 = String::from("data"); let text2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
JOIN products ON users.id = products.name
JOIN products ON users.id = products.name
Correct.
SQL
function process() {{ return {{key:'test'}} }}
function process() {{ return {{key:'test'}}; }}
Return object on same line.
JavaScript
function render(): void {{ return 34; }}
function render(): number {{ return 34; }}
Return type mismatch.
TypeScript
Write-Host 'result'
Write-Host 'result'
Correct.
PowerShell
if x = 54
if x == 54
Use ==.
Go
const result;
const result = 1;
Initialize const.
JavaScript
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
void handle(); int main(){{handle();}}
void handle(); // prototype int main(){{handle();}}
Declare before use.
C++
// comment
/* comment */
Use /* */.
CSS
<person age=56>
<person age="56">
Quote attribute.
XML
$items[8]
if ($items.Count -gt 8) {{ $items[8] }}
Check bounds.
PowerShell
if foo = 65:
if foo == 65:
Use == for comparison.
Python
{{"title":"hello",}}
{{"title":"hello"}}
Remove trailing comma.
JSON
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
void main() {{ print('data') }}
void main() {{ print('data'); }}
Add semicolon.
Dart
x := 62
x := 62
Correct.
Go
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
var x int
var x int
Correct.
Go
<br></br>
<br>
Self-closing.
HTML
<div><p>data</div></p>
<div><p>data</p></div>
Nest properly.
HTML
fn process() -> i32 {{ 80 }}
fn process() -> i32 {{ 80 }}
Correct.
Rust
for i=1,88 do print(i) end
for i=1,88 do print(i) end
Correct.
Lua
cin >> temp cout << temp;
cin >> temp; cout << temp;
Add semicolon.
C++
function handle(): void {{ return 39; }}
function handle(): number {{ return 39; }}
Return type mismatch.
TypeScript
<?php // code ?>
<?php // code ?>
Correct.
PHP
let s1 = String::from("test"); let s2 = s1; println!("{{}}", s1);
let s1 = String::from("test"); let s2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
while foo > 15 foo -= 1
while foo > 15: foo -= 1
Colon missing after while.
Python
list.forEach(function(z) {{ console.log(z); }})
list.forEach((z) => {{ console.log(z); }})
Arrow functions are cleaner.
JavaScript
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
<person><name>result</name><age>10</age></person
<person><name>result</name><age>10</age></person>
Add closing >.
XML
if data > 71 puts 'value'
if data > 71 puts 'value' end
Add 'end'.
Ruby
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
Product.save();
Product.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
'44' + 92
44 + 92
Avoid string coercion.
JavaScript
if (x) console.log('yes') else console.log('no')
if (x) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
let num: i32 = "world";
let num: &str = "world";
Type mismatch.
Rust
function baz(index:string){{return index;}} baz(57);
function baz(index:string){{return index;}} baz('result');
Pass correct type.
TypeScript
y == '76'
y === 76
Use strict equality.
JavaScript
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
title: value name: data,
title: value name: data
Remove comma.
YAML
List(68,26,97)
List(68,26,97)
Correct.
Scala
val y = 26; y = 44
var y = 26; y = 44
Use var for reassignment.
Scala
if a = 34
if a == 34
Use ==.
Ruby
<p>world <b>test</p></b>
<p>world <b>test</b></p>
Nest properly.
HTML
print('output')
print('output')
Correct.
R
let item: Int = 'result'
let item: String = 'result'
Fix type.
Swift
assert item > 20
assert item > 20
Correct.
Python
DELETE FROM orders WHERE name=23
DELETE FROM orders WHERE name=23;
Add semicolon.
SQL
const z = 46; z = 82;
let z = 46; z = 82;
Cannot reassign const.
JavaScript
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
try {{ throw 'data'; }} catch(e) {{}}
try {{ throw new Error('data'); }} catch(e) {{}}
Throw Error objects.
JavaScript
{{"title":"message" "name":38}}
{{"title":"message", "name":38}}
Add comma.
JSON
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
["test", 33]
["test", 33]
Correct.
JSON
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
[25, 88, 74
[25, 88, 74]
Close bracket.
Python
// comment
/* comment */
Use /* */.
CSS
int b = 'world';
String b = 'world';
Type mismatch.
Dart
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
[23, 47, 84
[23, 47, 84]
Close bracket.
Ruby
const obj:Person = {{name:'world'}};
const obj:Person = {{name:'world', age:12}};
Add missing property.
TypeScript
WHERE id = '32'
WHERE id = 32
Don't quote integer.
SQL
div {{ color=#fff; }}
div {{ color: #fff; }}
Use colon.
CSS
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
jwt.sign({{id:15}}, 'password');
jwt.sign({{id:15}}, 'password', {{expiresIn:'15m'}});
Add expiration.
Node.js
bar = 68
bar=68
No spaces.
Shell
$y = 74; if ($y = 74) {{}}
$y = 74; if ($y == 74) {{}}
Use ==.
PHP
for val in range(21) print(val)
for val in range(21): print(val)
Colon after for.
Python
with open('data.txt') as fh: data = fh.read()
with open('data.txt') as fh: data = fh.read()
Correct.
Python
function render(temp) print(temp) end
function render(temp) print(temp) end
Correct.
Lua
'value' + 92
'value' + 92.to_s
Convert int.
Ruby
<hr></hr>
<hr>
Self-closing.
HTML
b > 17 & x < 46
b > 17 and x < 46
Use 'and' not '&'.
Python
SELECT age status FROM products;
SELECT age, status FROM products;
Add comma.
SQL
class = 'data'
class_name = 'data'
'class' is a keyword.
Python
const x;
const x = 68;
Initialize const.
JavaScript
val item = 'value'
val item = "value"
Double quotes.
Kotlin
Write-Host 'message'
Write-Host 'message'
Correct.
PowerShell
if x > 41 print('result')
if x > 41: print('result')
Colon missing after if.
Python