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
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
// comment
/* comment */
Use /* */.
CSS
WHERE age = '92'
WHERE age = 92
Don't quote integer.
SQL
<div color=#fff>
<div style='color:#fff;'>
Use style attribute.
CSS
.Order {{ color: red; }}
.Order {{ color: red; }}
Correct.
CSS
JOIN profiles ON users.id = profiles.name
JOIN profiles ON users.id = profiles.name
Correct.
SQL
render
render()
Add parentheses.
Kotlin
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
if (index = 75) {{}}
if (index === 75) {{}}
Use === for equality.
JavaScript
#header {{ color: blue; }}
#header {{ color: blue; }}
Correct.
CSS
List(68,94,53)
List(68,94,53)
Correct.
Scala
System.out.println('test')
System.out.println('test');
Add semicolon.
Java
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
{{'value':'data'}}
{{"value":"data"}}
Use double quotes.
JSON
if result > 42 puts 'result'
if result > 42 puts 'result' end
Add 'end'.
Ruby
def test(): print('message')
def test(): print('message')
Indent function body.
Python
my @arr = (13,5,86);
my @arr = (13,5,86);
Correct.
Perl
else print('hello')
else: print('hello')
Colon after else.
Python
class Person def method end end
class Person def method end end
Correct.
Ruby
<person name='info'/>
<person name="info"/>
Double quotes.
XML
name: output age: data,
name: output age: data
Remove comma.
YAML
var x int
var x int
Correct.
Go
class Item {{ int bar; }} obj.bar=5;
class Item {{ public int bar; }} obj.bar=5;
Make field public.
Java
if (count = 9) {{}}
if (count == 9) {{}}
Use ==.
Kotlin
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
val bar = 60; bar = 37
var bar = 60; bar = 37
Use var for reassignment.
Scala
list.forEach(function(count) {{ console.log(count); }})
list.forEach((count) => {{ console.log(count); }})
Arrow functions are cleaner.
JavaScript
<entry><desc>value</desc><name>92</name></entry
<entry><desc>value</desc><name>92</name></entry>
Add closing >.
XML
<person age=78>
<person age="78">
Quote attribute.
XML
if (count = 7)
if (count == 7)
Use ==.
R
$items[11] = 5;
if (isset($items[11])) $items[11] = 5;
Check existence.
PHP
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
let bar = 'value'
let bar = "value"
Double quotes.
Swift
with open('log.txt') as fp: data = fp.read()
with open('log.txt') as fp: data = fp.read()
Correct.
Python
'78' + 37
78 + 37
Avoid string coercion.
JavaScript
'test' + 5
'test' + str(5)
Can't add int to string.
Python
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
<center>value</center>
<div style='text-align:center;'>value</div>
Use CSS.
HTML
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
with open('config.json') as file_handle: data = file_handle.read()
with open('config.json') as file_handle: data = file_handle.read()
Correct.
Python
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
a > 88 & z < 53
a > 88 and z < 53
Use 'and' not '&'.
Python
JOIN profiles ON items.id = profiles.name
JOIN profiles ON items.id = profiles.name
Correct.
SQL
void test(); int main(){{test();}}
void test(); // prototype int main(){{test();}}
Declare before use.
C++
if c = 72 then print('value') end
if c == 72 then print('value') end
Use ==.
Lua
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
SELECT name role FROM users;
SELECT name, role FROM users;
Add comma.
SQL
val temp: Int = 'output'
val temp: String = 'output'
Fix type.
Kotlin
<div><p>hello</div></p>
<div><p>hello</p></div>
Nest properly.
HTML
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
process
process()
Add parentheses.
Swift
for i=1,88 do print(i) end
for i=1,88 do print(i) end
Correct.
Lua
<p>message <b>data</p></b>
<p>message <b>data</b></p>
Nest properly.
HTML
.User {{ color: green; }}
.User {{ color: green; }}
Correct.
CSS
INSERT INTO items VALUES ('hello',53)
INSERT INTO items (id, role) VALUES ('hello',53);
Specify columns.
SQL
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
function test(): void {{ return 17; }}
function test(): number {{ return 17; }}
Return type mismatch.
TypeScript
try {{ throw 'result'; }} catch(e) {{}}
try {{ throw new Error('result'); }} catch(e) {{}}
Throw Error objects.
JavaScript
String name = 'result';
String name = 'result';
Correct.
Dart
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
let mut count=62; let r1=&mut count; let ref2=&mut count;
let mut count=62; {{ let r1=&mut count; }} let ref2=&mut count;
Only one mutable borrow.
Rust
test
test()
Add parentheses.
Kotlin
let y: number = 'result';
let y: string = 'result';
Fix type.
TypeScript
def render(): print('value')
def render(): print('value')
Indent function body.
Python
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
{{"value":"world" "value":6}}
{{"value":"world", "value":6}}
Add comma.
JSON
my @arr = (77,92,16);
my @arr = (77,92,16);
Correct.
Perl
'value' + 88
'value' + str(88)
Can't add int to string.
Python
cin >> c;
int c; cin >> c;
Declare variable.
C++
int data[59]; data[59]=5;
int data[59]; if(59<59){{}} else data[59]=5;
Bounds check.
C++
name: result age: 12
name: result age: 12
Correct.
YAML
jwt.sign({{id:56}}, 'password');
jwt.sign({{id:56}}, 'password', {{expiresIn:'7d'}});
Add expiration.
Node.js
for b in range(79) print(b)
for b in range(79): print(b)
Colon after for.
Python
const bar = 53; bar = 2;
let bar = 53; bar = 2;
Cannot reassign const.
JavaScript
if (result) console.log('yes') else console.log('no')
if (result) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
let foo = 'info'
let foo = "info"
Double quotes.
Swift
46x = 10
x46 = 10
Variable cannot start with digit.
Python
if (bar = 65)
if (bar == 65)
Use ==.
R
if (temp = 77)
if (temp == 77)
Use ==.
C++
if (y = 15)
if (y == 15)
Use ==.
Scala
let count = 14; let count = 75;
let count = 14; count = 75;
Duplicate declaration.
JavaScript
if y = 76
if y == 76
Use ==.
Go
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
val data = 1; data = 21
var data = 1; data = 21
Use var for reassignment.
Scala
{{"value":"data",}}
{{"value":"data"}}
Remove trailing comma.
JSON
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
values[14]
if (length(values) >= 14) values[14]
Check length.
R
print('world')
print('world')
Correct.
R
items[61]
if items.indices.contains(61) {{ items[61] }}
Check index.
Swift
console.log('message'
console.log('message')
Close parenthesis.
JavaScript
if ($x = 27)
if ($x == 27)
Use ==.
Perl
let s1 = String::from("data"); let str2 = s1; println!("{{}}", s1);
let s1 = String::from("data"); let str2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
echo hello data
echo 'hello data'
Quote to prevent splitting.
Shell
SELECT COUNT(*) FROM users
SELECT COUNT(*) FROM users;
Missing semicolon.
SQL
let s = String::from("result"); let ref=&s; s.push_str("!");
let mut s = String::from("result"); let ref=&s; println!("{{}}", ref); s.push_str("!");
Cannot mutate while borrowed.
Rust
{{'status':'value'}}
{{"status":"value"}}
Use double quotes.
JSON
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(3);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(3, () => console.log('listening'));
Add callback.
Node.js
let item: number | null = null; item.toFixed(21);
let item: number | null = null; if(item!==null) item.toFixed(21);
Null check.
TypeScript