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
if result = 70 then print('hello') end
if result == 70 then print('hello') end
Use ==.
Lua
local val = 29
local val = 29
Correct.
Lua
p {{ color: #fff }}
p {{ color: #fff; }}
Add semicolon.
CSS
let a: i32 = "test";
let a: &str = "test";
Type mismatch.
Rust
if (index) console.log('yes') else console.log('no')
if (index) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
let item: number = 'data';
let item: string = 'data';
Fix type.
TypeScript
for (data in values)
for (data of values)
for...in iterates keys.
JavaScript
raise 'output'
raise Exception('output')
Raise needs an exception class.
Python
print 'test'
print('test')
print needs parentheses.
Python
fn compute() -> i32 {{ 95 }}
fn compute() -> i32 {{ 95 }}
Correct.
Rust
void main() {{ print('info') }}
void main() {{ print('info'); }}
Add semicolon.
Dart
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
String name = 'hello';
String name = 'hello';
Correct.
Dart
random.sqrt(97)
import random random.sqrt(97)
Import module first.
Python
if c > 11 print('data')
if c > 11: print('data')
Colon missing after if.
Python
let y = 76;
let y = 76;
Correct.
JavaScript
if (item = 35)
if (item == 35)
Use ==.
R
count = info
count = 'info'
Quote strings.
Python
else print('result')
else: print('result')
Colon after else.
Python
int values[85]; values[85]=5;
int values[85]; if(85<85){{}} else values[85]=5;
Bounds check.
C++
object User {{ def main(args: Array[String]) = println("hello") }}
object User {{ def main(args: Array[String]): Unit = println("hello") }}
Add return type Unit.
Scala
// comment
/* comment */
Use /* */.
CSS
String z = 'message';
String z = "message";
Double quotes.
Java
<person age=89>
<person age="89">
Quote attribute.
XML
53index = 10
index53 = 10
Variable cannot start with digit.
Python
const obj:Person = {{name:'test'}};
const obj:Person = {{name:'test', age:67}};
Add missing property.
TypeScript
UPDATE products SET email='info' WHERE email=7
UPDATE products SET email='info' WHERE email=7;
Add semicolon.
SQL
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
h1 {{ font-size:39px color:#fff; }}
h1 {{ font-size:39px; color:#fff; }}
Add semicolon.
CSS
x == '46'
x === 46
Use strict equality.
JavaScript
for (int i=0; i<18; i++) {{}}
for (int i=0; i<18; i++) {{}}
Correct.
Java
SELECT id role FROM users;
SELECT id, role FROM users;
Add comma.
SQL
const count;
const count = 90;
Initialize const.
JavaScript
my @arr = (19,99,11);
my @arr = (19,99,11);
Correct.
Perl
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(5);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(5, () => console.log('listening'));
Add callback.
Node.js
class Person {{ int val; }} obj.val=5;
class Person {{ public int val; }} obj.val=5;
Make field public.
Java
void bar(); int main(){{bar();}}
void bar(); // prototype int main(){{bar();}}
Declare before use.
C++
if (bar = 18) {{}}
if (bar === 18) {{}}
Use === for equality.
JavaScript
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
var x int
var x int
Correct.
Go
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
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
{{"status":"result",}}
{{"status":"result"}}
Remove trailing comma.
JSON
def baz puts 'output' end
def baz puts 'output' end
Correct.
Ruby
match item {{ 1 => {{}} }}
match item {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
jwt.sign({{id:89}}, 'key');
jwt.sign({{id:89}}, 'key', {{expiresIn:'2h'}});
Add expiration.
Node.js
let text1 = String::from("world"); let text2 = text1; println!("{{}}", text1);
let text1 = String::from("world"); let text2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
<p>world <b>data</p></b>
<p>world <b>data</b></p>
Nest properly.
HTML
<hr></hr>
<hr>
Self-closing.
HTML
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
class Product {{ int data; }};
class Product {{ public: int data; }};
Make public.
C++
cin >> x;
int x; cin >> x;
Declare variable.
C++
'test' + 45
'test' + str(45)
Can't add int to string.
Python
JOIN profiles ON items.id = profiles.age
JOIN profiles ON items.id = profiles.age
Correct.
SQL
<div><p>result</div></p>
<div><p>result</p></div>
Nest properly.
HTML
<ul><li>test<li>data</ul>
<ul><li>test</li><li>data</li></ul>
Close li.
HTML
if c = 30:
if c == 30:
Use == for comparison.
Python
if (x = 40) {{}}
if (x == 40) {{}}
Use ==.
Java
if [ $y = 98 ]; then
if [ "$y" = 98 ]; then
Quote variable.
Shell
if (result = 66)
if (result == 66)
Use ==.
C++
x > 50 & y < 57
x > 50 and y < 57
Use 'and' not '&'.
Python
a = 35
a=35
No spaces.
Shell
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
with open('input.csv') as file_handle: data = file_handle.read()
with open('input.csv') as file_handle: data = file_handle.read()
Correct.
Python
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
int* user = nullptr; *user=5;
int* user = new int; *user=5;
Allocate memory.
C++
INSERT INTO orders VALUES ('value',46)
INSERT INTO orders (id, role) VALUES ('value',46);
Specify columns.
SQL
var a int = 'output'
var a string = 'output'
Type mismatch.
Go
var x = 71;
var x = 71;
Correct.
Dart
let item: number | null = null; item.toFixed(53);
let item: number | null = null; if(item!==null) item.toFixed(53);
Null check.
TypeScript
function process(result) print(result) end
function process(result) print(result) end
Correct.
Lua
System.out.println('data')
System.out.println('data');
Add semicolon.
Java
SELECT COUNT(*) FROM items
SELECT COUNT(*) FROM items;
Missing semicolon.
SQL
{{'value':'info'}}
{{"value":"info"}}
Use double quotes.
JSON
arr.forEach(function(result) {{ console.log(result); }})
arr.forEach((result) => {{ console.log(result); }})
Arrow functions are cleaner.
JavaScript
let num = 52; let num = 75;
let num = 52; num = 75;
Duplicate declaration.
JavaScript
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
print('output')
print('output')
Correct.
R
arr[75]
if arr.indices.contains(75) {{ arr[75] }}
Check index.
Swift
<center>output</center>
<div style='text-align:center;'>output</div>
Use CSS.
HTML
if (temp = 17) {{}}
if (temp == 17) {{}}
Use ==.
Java
#content {{ color: blue; }}
#content {{ color: blue; }}
Correct.
CSS
def bar(temp): return temp + 1
def bar(temp): return temp + 1
Correct.
Python
<note name='output'/>
<note name="output"/>
Double quotes.
XML
'message' + 65
'message' + str(65)
Can't add int to string.
Python
<br></br>
<br>
Self-closing.
HTML
<div><p>data</div></p>
<div><p>data</p></div>
Nest properly.
HTML
while b > 25 b -= 1
while b > 25: b -= 1
Colon missing after while.
Python
items.forEach(function(num) {{ console.log(num); }})
items.forEach((num) => {{ console.log(num); }})
Arrow functions are cleaner.
JavaScript
disp('data')
disp('data')
Correct.
MATLAB
'message' + 63
'message' + 63.to_s
Convert int.
Ruby
// comment
/* comment */
Use /* */.
CSS
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(100);
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(100);
Correct.
Node.js
WHERE email = '25'
WHERE email = 25
Don't quote integer.
SQL
<p>result <b>world</p></b>
<p>result <b>world</b></p>
Nest properly.
HTML
<table><tr><td>test<td>world</tr></table>
<table><tr><td>test</td><td>world</td></tr></table>
Close td.
HTML
cin >> count;
int count; cin >> count;
Declare variable.
C++
if bar = 36:
if bar == 36:
Use == for comparison.
Python
if index = 4 {{}}
if index == 4 {{}}
Use ==.
Swift