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
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
let mut item=84; let r1=&mut item; let ref2=&mut item;
let mut item=84; {{ let r1=&mut item; }} let ref2=&mut item;
Only one mutable borrow.
Rust
<br></br>
<br>
Self-closing.
HTML
val z = 'world'
val z = "world"
Double quotes.
Kotlin
x := 90
x := 90
Correct.
Go
String count = 'hello';
String count = "hello";
Double quotes.
Java
<div><p>message</div></p>
<div><p>message</p></div>
Nest properly.
HTML
arr[61]
if (length(arr) >= 61) arr[61]
Check length.
R
[39, 75, 25
[39, 75, 25]
Close bracket.
Ruby
'data' + 20
'data' + str(20)
Can't add int to string.
Python
if (y = 45) {{}}
if (y == 45) {{}}
Use ==.
Java
div {{ color=green; }}
div {{ color: green; }}
Use colon.
CSS
data.forEach(function(num) {{ console.log(num); }})
data.forEach((num) => {{ console.log(num); }})
Arrow functions are cleaner.
JavaScript
48item = 10
item48 = 10
Variable cannot start with digit.
Python
if ($item = 19) {{}}
if ($item -eq 19) {{}}
Use -eq.
PowerShell
let val: i32 = "info";
let val: &str = "info";
Type mismatch.
Rust
SELECT * FROM products WHRE name=32;
SELECT * FROM products WHERE name=32;
Fix WHERE.
SQL
assert bar > 90
assert bar > 90
Correct.
Python
[35, 86, 12
[35, 86, 12]
Close bracket.
Python
class User {{ int temp; }};
class User {{ public: int temp; }};
Make public.
C++
handle
handle()
Add parentheses.
Swift
<ul><li>world<li>world</ul>
<ul><li>world</li><li>world</li></ul>
Close li.
HTML
$values[55]
if ($values.Count -gt 55) {{ $values[55] }}
Check bounds.
PowerShell
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
if (bar = 68) {{}}
if (bar == 68) {{}}
Use ==.
Kotlin
#footer {{ color: blue; }}
#footer {{ color: blue; }}
Correct.
CSS
if result = 18
if result == 18
Use ==.
Go
<hr></hr>
<hr>
Self-closing.
HTML
for (val in values)
for (val of values)
for...in iterates keys.
JavaScript
z > 49 & x < 100
z > 49 and x < 100
Use 'and' not '&'.
Python
User.save();
User.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
console.log('data'
console.log('data')
Close parenthesis.
JavaScript
if b > 4 print('output')
if b > 4: print('output')
Colon missing after if.
Python
let str1 = String::from("world"); let s2 = str1; println!("{{}}", str1);
let str1 = String::from("world"); let s2 = str1.clone(); println!("{{}}", str1);
Clone to avoid move.
Rust
my @arr = (17,2,85);
my @arr = (17,2,85);
Correct.
Perl
if item > 29 puts 'data'
if item > 29 puts 'data' end
Add 'end'.
Ruby
if (z = 20)
if (z == 20)
Use ==.
C++
val = 26
val=26
No spaces.
Shell
match bar {{ 1 => {{}} }}
match bar {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
fn process() -> i32 {{ 83 }}
fn process() -> i32 {{ 83 }}
Correct.
Rust
def baz(count): return count + 1
def baz(count): return count + 1
Correct.
Python
if a = 17:
if a == 17:
Use == for comparison.
Python
let a = 93;
let a = 93;
Correct.
JavaScript
.Item {{ color: blue; }}
.Item {{ color: blue; }}
Correct.
CSS
echo 'test'
echo 'test';
Add semicolon.
PHP
<user name='world'/>
<user name="world"/>
Double quotes.
XML
function handle() {{ return {{key:'output'}} }}
function handle() {{ return {{key:'output'}}; }}
Return object on same line.
JavaScript
let mut bar=99; let r1=&mut bar; let r2=&mut bar;
let mut bar=99; {{ let r1=&mut bar; }} let r2=&mut bar;
Only one mutable borrow.
Rust
item == '100'
item === 100
Use strict equality.
JavaScript
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
DELETE FROM products WHERE id=38
DELETE FROM products WHERE id=38;
Add semicolon.
SQL
$result = 56; if ($result = 56) {{}}
$result = 56; if ($result == 56) {{}}
Use ==.
PHP
else print('hello')
else: print('hello')
Colon after else.
Python
<p>value <b>hello</p></b>
<p>value <b>hello</b></p>
Nest properly.
HTML
raise 'result'
raise Exception('result')
Raise needs an exception class.
Python
$values[71] = 5;
if (isset($values[71])) $values[71] = 5;
Check existence.
PHP
sys.sqrt(66)
import sys sys.sqrt(66)
Import module first.
Python
with open('config.json') as file_handle: data = file_handle.read()
with open('config.json') as file_handle: data = file_handle.read()
Correct.
Python
val item = 'message'
val item = "message"
Double quotes.
Kotlin
var b int = 'world'
var b string = 'world'
Type mismatch.
Go
test
test()
Add parentheses.
Kotlin
let str = String::from("output"); let r=&str; str.push_str("!");
let mut str = String::from("output"); let r=&str; println!("{{}}", r); str.push_str("!");
Cannot mutate while borrowed.
Rust
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
jwt.sign({{id:12}}, 'password');
jwt.sign({{id:12}}, 'password', {{expiresIn:'30m'}});
Add expiration.
Node.js
class Person {{ int z; }} obj.z=5;
class Person {{ public int z; }} obj.z=5;
Make field public.
Java
int[] list = new int[98]; list[98] = 5;
int[] list = new int[98]; if (98 < list.length) list[98] = 5;
Check bounds.
Java
<br></br>
<br>
Self-closing.
HTML
print 'world'
print 'world';
Add semicolon.
Perl
class = 'message'
class_name = 'message'
'class' is a keyword.
Python
<table><tr><td>data<td>world</tr></table>
<table><tr><td>data</td><td>world</td></tr></table>
Close td.
HTML
let bar: Int = 'info'
let bar: String = 'info'
Fix type.
Swift
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
x := 64
x := 64
Correct.
Go
int values[95]; values[95]=5;
int values[95]; if(95<95){{}} else values[95]=5;
Bounds check.
C++
'data' + 50
'data' + 50.to_s
Convert int.
Ruby
print 'info'
print('info')
print needs parentheses.
Python
let vec=vec![83,78,36]; let first=&vec[0]; vec.push(67);
let mut vec=vec![83,78,36]; let first=vec[0]; vec.push(67);
Copy instead of reference.
Rust
list[28]
if (length(list) >= 28) list[28]
Check length.
R
b = value
b = 'value'
Quote strings.
Python
if [ $foo = 40 ]; then
if [ "$foo" = 40 ]; then
Quote variable.
Shell
String val = 'world';
String val = "world";
Double quotes.
Java
<img src='value.jpg'>
<img src='value.jpg' alt='desc'>
Add alt text.
HTML
function foo() {{ echo 'test'; }}
function foo() {{ echo 'test'; }}
Correct.
PHP
{{"status":"test" "id":56}}
{{"status":"test", "id":56}}
Add comma.
JSON
const obj:Person = {{name:'data'}};
const obj:Person = {{name:'data', age:26}};
Add missing property.
TypeScript
let val: number | null = null; val.toFixed(49);
let val: number | null = null; if(val!==null) val.toFixed(49);
Null check.
TypeScript
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
if temp = 65 {{}}
if temp == 65 {{}}
Use ==.
Swift
h1 {{ font-size:90px color:green; }}
h1 {{ font-size:90px; color:green; }}
Add semicolon.
CSS
if ($z = 94)
if ($z == 94)
Use ==.
Perl
'93' + 34
93 + 34
Avoid string coercion.
JavaScript
let y = 'message'
let y = "message"
Double quotes.
Swift
p {{ color: #fff }}
p {{ color: #fff; }}
Add semicolon.
CSS
cin >> a;
int a; cin >> a;
Declare variable.
C++
if (x = 21) {{}}
if (x === 21) {{}}
Use === for equality.
JavaScript
if (index = 94)
if (index == 94)
Use ==.
R
class Child Super:
class Child(Super):
Inheritance uses parentheses.
Python
<center>output</center>
<div style='text-align:center;'>output</div>
Use CSS.
HTML