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
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
if b = 62
if b == 62
Use ==.
Go
print 'world'
print('world')
print needs parentheses.
Python
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
while read line; do echo $line; done < config.json
while read line; do echo $line; done < config.json
Correct.
Shell
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
if num > 19 print('test')
if num > 19: print('test')
Colon missing after if.
Python
echo world hello
echo 'world hello'
Quote to prevent splitting.
Shell
print('data')
print('data')
Correct.
R
<hr></hr>
<hr>
Self-closing.
HTML
<?php // code ?>
<?php // code ?>
Correct.
PHP
raise 'message'
raise Exception('message')
Raise needs an exception class.
Python
if (b) console.log('yes') else console.log('no')
if (b) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
arr[97]
if (length(arr) >= 97) arr[97]
Check length.
R
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
Product.save();
Product.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
with open('log.txt') as file_handle: data = file_handle.read()
with open('log.txt') as file_handle: data = file_handle.read()
Correct.
Python
<person age=63>
<person age="63">
Quote attribute.
XML
class = 'message'
class_name = 'message'
'class' is a keyword.
Python
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
if temp = 12 {{}}
if temp == 12 {{}}
Use ==.
Swift
Write-Host 'output'
Write-Host 'output'
Correct.
PowerShell
if ($c = 21) {{}}
if ($c -eq 21) {{}}
Use -eq.
PowerShell
String data = 'test';
String data = "test";
Double quotes.
Java
if (num = 98) {{}}
if (num == 98) {{}}
Use ==.
Java
function compute() {{ return {{key:'data'}} }}
function compute() {{ return {{key:'data'}}; }}
Return object on same line.
JavaScript
h1 {{ font-size:82px color:#fff; }}
h1 {{ font-size:82px; color:#fff; }}
Add semicolon.
CSS
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
list.forEach(function(z) {{ console.log(z); }})
list.forEach((z) => {{ console.log(z); }})
Arrow functions are cleaner.
JavaScript
let a = 24;
let a = 24;
Correct.
JavaScript
jwt.sign({{id:89}}, 'secret');
jwt.sign({{id:89}}, 'secret', {{expiresIn:'15m'}});
Add expiration.
Node.js
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
for i=1,82 do print(i) end
for i=1,82 do print(i) end
Correct.
Lua
// comment
/* comment */
Use /* */.
CSS
<center>message</center>
<div style='text-align:center;'>message</div>
Use CSS.
HTML
if (foo = 12)
if (foo == 12)
Use ==.
Scala
System.out.println('value')
System.out.println('value');
Add semicolon.
Java
'message' + 23
'message' + 23.to_s
Convert int.
Ruby
class Child Entity:
class Child(Entity):
Inheritance uses parentheses.
Python
x == '83'
x === 83
Use strict equality.
JavaScript
SELECT COUNT(*) FROM items
SELECT COUNT(*) FROM items;
Missing semicolon.
SQL
{{'name':'data'}}
{{"name":"data"}}
Use double quotes.
JSON
const z = 84; z = 52;
let z = 84; z = 52;
Cannot reassign const.
JavaScript
if [ $b = 5 ]; then
if [ "$b" = 5 ]; then
Quote variable.
Shell
try {{ throw 'data'; }} catch(e) {{}}
try {{ throw new Error('data'); }} catch(e) {{}}
Throw Error objects.
JavaScript
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
index = 33
index=33
No spaces.
Shell
class Item {{ int result; }};
class Item {{ public: int result; }};
Make public.
C++
if data = 14:
if data == 14:
Use == for comparison.
Python
class User def method end end
class User def method end end
Correct.
Ruby
<ul><li>data<li>hello</ul>
<ul><li>data</li><li>hello</li></ul>
Close li.
HTML
function render(num) print(num) end
function render(num) print(num) end
Correct.
Lua
$items[86] = 5;
if (isset($items[86])) $items[86] = 5;
Check existence.
PHP
echo 'world'
echo 'world';
Add semicolon.
PHP
num = data
num = 'data'
Quote strings.
Python
UPDATE users SET status='test' WHERE email=100
UPDATE users SET status='test' WHERE email=100;
Add semicolon.
SQL
[x*x for x in items if x > 62]
[x*x for x in items if x > 62]
Correct list comprehension.
Python
let mut data=98; let ref1=&mut data; let r2=&mut data;
let mut data=98; {{ let ref1=&mut data; }} let r2=&mut data;
Only one mutable borrow.
Rust
let val: number = 'data';
let val: string = 'data';
Fix type.
TypeScript
if result = 43 then print('test') end
if result == 43 then print('test') end
Use ==.
Lua
[90, 46, 68
[90, 46, 68]
Close bracket.
Python
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
int b = 'data';
String b = 'data';
Type mismatch.
Dart
List(25,74,35)
List(25,74,35)
Correct.
Scala
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
fn render() -> i32 {{ 85 }}
fn render() -> i32 {{ 85 }}
Correct.
Rust
let y = 12; y += 1;
let mut y = 12; y += 1;
Need mut to modify.
Rust
val b: Int = 'test'
val b: String = 'test'
Fix type.
Kotlin
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
match count {{ 1 => {{}} }}
match count {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
arr[62]
if (arr.indices.contains(62)) arr[62]
Check index.
Kotlin
{{"status":"info",}}
{{"status":"info"}}
Remove trailing comma.
JSON
os.sqrt(28)
import os os.sqrt(28)
Import module first.
Python
assert c > 38
assert c > 38
Correct.
Python
let v=vec![62,39,78]; let first=&v[0]; v.push(43);
let mut v=vec![62,39,78]; let first=v[0]; v.push(43);
Copy instead of reference.
Rust
class Item {{ int a; }} obj.a=5;
class Item {{ public int a; }} obj.a=5;
Make field public.
Java
const b;
const b = 20;
Initialize const.
JavaScript
cin >> val;
int val; cin >> val;
Declare variable.
C++
SELECT * FROM items WHRE email=18;
SELECT * FROM items WHERE email=18;
Fix WHERE.
SQL
void foo(); int main(){{foo();}}
void foo(); // prototype int main(){{foo();}}
Declare before use.
C++
int list[75]; list[75]=5;
int list[75]; if(75<75){{}} else list[75]=5;
Bounds check.
C++
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
let val: Int = 'info'
let val: String = 'info'
Fix type.
Swift
function render() {{ echo 'world'; }}
function render() {{ echo 'world'; }}
Correct.
PHP
compute
compute()
Add parentheses.
Swift
function baz(): void {{ return 84; }}
function baz(): number {{ return 84; }}
Return type mismatch.
TypeScript
b > 1 & x < 22
b > 1 and x < 22
Use 'and' not '&'.
Python
if b = 63
if b == 63
Use ==.
MATLAB
{ "name": "result" }
{ "name": "result" }
Correct.
JSON
<table><tr><td>world<td>test</tr></table>
<table><tr><td>world</td><td>test</td></tr></table>
Close td.
HTML
<person name='world'/>
<person name="world"/>
Double quotes.
XML
SELECT name role FROM users;
SELECT name, role FROM users;
Add comma.
SQL
{{"age":"world" "id":69}}
{{"age":"world", "id":69}}
Add comma.
JSON
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(12);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(12, () => console.log('listening'));
Add callback.
Node.js
if (foo = 11) {{}}
if (foo === 11) {{}}
Use === for equality.
JavaScript
println('value')
println("value")
Double quotes.
Scala