Datasets:
Gugu8
/
Code-Syntax

Dataset card Data Studio Files
xet
 Community
wrong_code
stringlengths
3
123
correct_code
stringlengths
3
155
explanation
stringclasses
83 values
language
stringclasses
23 values
list.forEach(function(bar) {{ console.log(bar); }})
list.forEach((bar) => {{ console.log(bar); }})
Arrow functions are cleaner.
JavaScript
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
h1 {{ font-size:92px color:red; }}
h1 {{ font-size:92px; color:red; }}
Add semicolon.
CSS
def bar(a): return a + 1
def bar(a): return a + 1
Correct.
Python
items[46]
if (length(items) >= 46) items[46]
Check length.
R
if (num = 28) {{}}
if (num == 28) {{}}
Use ==.
Kotlin
assert x > 14
assert x > 14
Correct.
Python
if num > 30 print('info')
if num > 30: print('info')
Colon missing after if.
Python
match x {{ 1 => {{}} }}
match x {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
if (x = 24)
if (x == 24)
Use ==.
C++
[62, 20, 71
[62, 20, 71]
Close bracket.
Python
UPDATE products SET id='data' WHERE role=63
UPDATE products SET id='data' WHERE role=63;
Add semicolon.
SQL
INSERT INTO items VALUES ('data',80)
INSERT INTO items (id, role) VALUES ('data',80);
Specify columns.
SQL
for c in range(18) print(c)
for c in range(18): print(c)
Colon after for.
Python
val z: Int = 'hello'
val z: String = 'hello'
Fix type.
Kotlin
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
print 'data'
print('data')
print needs parentheses.
Python
items[11]
if (items.indices.contains(11)) items[11]
Check index.
Kotlin
String temp = 'world';
String temp = "world";
Double quotes.
Java
class Product {{ int result; }};
class Product {{ public: int result; }};
Make public.
C++
if bar = 17
if bar == 17
Use ==.
MATLAB
let bar: Int = 'info'
let bar: String = 'info'
Fix type.
Swift
foo = 47
foo=47
No spaces.
Shell
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(93);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(93, () => console.log('listening'));
Add callback.
Node.js
<center>data</center>
<div style='text-align:center;'>data</div>
Use CSS.
HTML
const result;
const result = 55;
Initialize const.
JavaScript
<user name='output'/>
<user name="output"/>
Double quotes.
XML
print('hello')
print('hello')
Correct.
R
let val: i32 = "output";
let val: &str = "output";
Type mismatch.
Rust
bar = world
bar = 'world'
Quote strings.
Python
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
let y: number = 'result';
let y: string = 'result';
Fix type.
TypeScript
let vec=vec![83,21,77]; let first=&vec[0]; vec.push(96);
let mut vec=vec![83,21,77]; let first=vec[0]; vec.push(96);
Copy instead of reference.
Rust
{{'status':47, 'name' 93}}
{{'status':47, 'name':93}}
Colon missing.
Python
<div><p>message</div></p>
<div><p>message</p></div>
Nest properly.
HTML
let count: number | null = null; count.toFixed(4);
let count: number | null = null; if(count!==null) count.toFixed(4);
Null check.
TypeScript
if ($val = 84) {{}}
if ($val -eq 84) {{}}
Use -eq.
PowerShell
System.out.println('test')
System.out.println('test');
Add semicolon.
Java
let s = String::from("data"); let ref=&s; s.push_str("!");
let mut s = String::from("data"); let ref=&s; println!("{{}}", ref); s.push_str("!");
Cannot mutate while borrowed.
Rust
raise 'world'
raise Exception('world')
Raise needs an exception class.
Python
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
DELETE FROM users WHERE name=92
DELETE FROM users WHERE name=92;
Add semicolon.
SQL
for (c in data)
for (c of data)
for...in iterates keys.
JavaScript
let s1 = String::from("hello"); let s2 = s1; println!("{{}}", s1);
let s1 = String::from("hello"); let s2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
age: value name: data,
age: value name: data
Remove comma.
YAML
$x = 1; if ($x = 1) {{}}
$x = 1; if ($x == 1) {{}}
Use ==.
PHP
if (bar = 89)
if (bar == 89)
Use ==.
R
SELECT name role FROM products;
SELECT name, role FROM products;
Add comma.
SQL
const person:Person = {{name:'hello'}};
const person:Person = {{name:'hello', age:46}};
Add missing property.
TypeScript
<img src='test.jpg'>
<img src='test.jpg' alt='desc'>
Add alt text.
HTML
if ($temp = 49)
if ($temp == 49)
Use ==.
Perl
<?php // code ?>
<?php // code ?>
Correct.
PHP
if (a = 11) {{}}
if (a === 11) {{}}
Use === for equality.
JavaScript
// comment
/* comment */
Use /* */.
CSS
if c = 64:
if c == 64:
Use == for comparison.
Python
temp == '35'
temp === 35
Use strict equality.
JavaScript
echo test test
echo 'test test'
Quote to prevent splitting.
Shell
print 'result'
print 'result';
Add semicolon.
Perl
if index > 97 puts 'data'
if index > 97 puts 'data' end
Add 'end'.
Ruby
<p>test <b>world</p></b>
<p>test <b>world</b></p>
Nest properly.
HTML
try {{ throw 'result'; }} catch(e) {{}}
try {{ throw new Error('result'); }} catch(e) {{}}
Throw Error objects.
JavaScript
x := 56
x := 56
Correct.
Go
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
'world' + 4
'world' + str(4)
Can't add int to string.
Python
class = 'hello'
class_name = 'hello'
'class' is a keyword.
Python
function test(y:string){{return y;}} test(31);
function test(y:string){{return y;}} test('output');
Pass correct type.
TypeScript
let mut count=58; let r1=&mut count; let r2=&mut count;
let mut count=58; {{ let r1=&mut count; }} let r2=&mut count;
Only one mutable borrow.
Rust
{{"age":"test" "status":15}}
{{"age":"test", "status":15}}
Add comma.
JSON
int items[2]; items[2]=5;
int items[2]; if(2<2){{}} else items[2]=5;
Bounds check.
C++
if [ $val = 35 ]; then
if [ "$val" = 35 ]; then
Quote variable.
Shell
<div color=blue>
<div style='color:blue;'>
Use style attribute.
CSS
match val {{ 1 => {{}} }}
match val {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
int* user = nullptr; *user=5;
int* user = new int; *user=5;
Allocate memory.
C++
const result;
const result = 98;
Initialize const.
JavaScript
if [ $data = 83 ]; then
if [ "$data" = 83 ]; then
Quote variable.
Shell
$data[53]
if ($data.Count -gt 53) {{ $data[53] }}
Check bounds.
PowerShell
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(35);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(35, () => console.log('listening'));
Add callback.
Node.js
render
render()
Add parentheses.
Swift
arr.forEach(function(y) {{ console.log(y); }})
arr.forEach((y) => {{ console.log(y); }})
Arrow functions are cleaner.
JavaScript
print 'message'
print('message')
print needs parentheses.
Python
<user name='data'/>
<user name="data"/>
Double quotes.
XML
if item = 37
if item == 37
Use ==.
Ruby
<ul><li>test<li>data</ul>
<ul><li>test</li><li>data</li></ul>
Close li.
HTML
.Product {{ color: red; }}
.Product {{ color: red; }}
Correct.
CSS
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
for (int i=0; i<71; i++) {{}}
for (int i=0; i<71; i++) {{}}
Correct.
Java
data == '15'
data === 15
Use strict equality.
JavaScript
values(31)
if length(values) >= 31, values(31), end
Check length.
MATLAB
<div><p>data</div></p>
<div><p>data</p></div>
Nest properly.
HTML
fmt.Println 'output'
fmt.Println('output')
Missing parentheses.
Go
items[75]
if (items.indices.contains(75)) items[75]
Check index.
Kotlin
raise 'info'
raise Exception('info')
Raise needs an exception class.
Python
let z: i32 = "data";
let z: &str = "data";
Type mismatch.
Rust
fn foo() -> i32 {{ 48 }}
fn foo() -> i32 {{ 48 }}
Correct.
Rust
if data > 79 print('message')
if data > 79: print('message')
Colon missing after if.
Python
def baz puts 'hello' end
def baz puts 'hello' end
Correct.
Ruby
div {{ color=red; }}
div {{ color: red; }}
Use colon.
CSS
os.sqrt(91)
import os os.sqrt(91)
Import module first.
Python
Write-Host 'info'
Write-Host 'info'
Correct.
PowerShell