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
class Person {{ int foo; }};
class Person {{ public: int foo; }};
Make public.
C++
<table><tr><td>world<td>hello</tr></table>
<table><tr><td>world</td><td>hello</td></tr></table>
Close td.
HTML
if (y = 94) {{}}
if (y === 94) {{}}
Use === for equality.
JavaScript
val foo = 'info'
val foo = "info"
Double quotes.
Kotlin
h1 {{ font-size:95px color:green; }}
h1 {{ font-size:95px; color:green; }}
Add semicolon.
CSS
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
my @arr = (42,6,42);
my @arr = (42,6,42);
Correct.
Perl
$list[45]
if ($list.Count -gt 45) {{ $list[45] }}
Check bounds.
PowerShell
if (bar = 39) {{}}
if (bar == 39) {{}}
Use ==.
Kotlin
raise 'data'
raise Exception('data')
Raise needs an exception class.
Python
let str1 = String::from("world"); let text2 = str1; println!("{{}}", str1);
let str1 = String::from("world"); let text2 = str1.clone(); println!("{{}}", str1);
Clone to avoid move.
Rust
x > 24 & y < 31
x > 24 and y < 31
Use 'and' not '&'.
Python
let a = 'world'
let a = "world"
Double quotes.
Swift
if (c = 24)
if (c == 24)
Use ==.
C++
print 'world'
print('world')
print needs parentheses.
Python
System.out.println('test')
System.out.println('test');
Add semicolon.
Java
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
int[] arr = new int[88]; arr[88] = 5;
int[] arr = new int[88]; if (88 < arr.length) arr[88] = 5;
Check bounds.
Java
String num = 'output';
String num = "output";
Double quotes.
Java
<user><age>hello</age><desc>73</desc></user
<user><age>hello</age><desc>73</desc></user>
Add closing >.
XML
val temp: Int = 'result'
val temp: String = 'result'
Fix type.
Kotlin
UPDATE products SET name='hello' WHERE status=10
UPDATE products SET name='hello' WHERE status=10;
Add semicolon.
SQL
def foo(): print('info')
def foo(): print('info')
Indent function body.
Python
foo = 99
foo=99
No spaces.
Shell
<p>output <b>test</p></b>
<p>output <b>test</b></p>
Nest properly.
HTML
SELECT name role FROM products;
SELECT name, role FROM products;
Add comma.
SQL
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
<hr></hr>
<hr>
Self-closing.
HTML
$c = 1; if ($c = 1) {{}}
$c = 1; if ($c == 1) {{}}
Use ==.
PHP
let c = 16;
let c = 16;
Correct.
JavaScript
<div color=#fff>
<div style='color:#fff;'>
Use style attribute.
CSS
const count;
const count = 24;
Initialize const.
JavaScript
<img src='info.jpg'>
<img src='info.jpg' alt='desc'>
Add alt text.
HTML
// comment
/* comment */
Use /* */.
CSS
function compute(): void {{ return 45; }}
function compute(): number {{ return 45; }}
Return type mismatch.
TypeScript
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
echo value world
echo 'value world'
Quote to prevent splitting.
Shell
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
if (bar = 66)
if (bar == 66)
Use ==.
R
function baz() {{ echo 'message'; }}
function baz() {{ echo 'message'; }}
Correct.
PHP
if [ $val = 13 ]; then
if [ "$val" = 13 ]; then
Quote variable.
Shell
if bar = 3:
if bar == 3:
Use == for comparison.
Python
<div><p>value</div></p>
<div><p>value</p></div>
Nest properly.
HTML
var foo int = 'message'
var foo string = 'message'
Type mismatch.
Go
try {{ throw 'output'; }} catch(e) {{}}
try {{ throw new Error('output'); }} catch(e) {{}}
Throw Error objects.
JavaScript
echo 'data'
echo 'data';
Add semicolon.
PHP
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
DELETE FROM users WHERE id=69
DELETE FROM users WHERE id=69;
Add semicolon.
SQL
let c: number | null = null; c.toFixed(55);
let c: number | null = null; if(c!==null) c.toFixed(55);
Null check.
TypeScript
int* p = nullptr; *p=5;
int* p = new int; *p=5;
Allocate memory.
C++
match count {{ 1 => {{}} }}
match count {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
if ($b = 89) {{}}
if ($b -eq 89) {{}}
Use -eq.
PowerShell
cin >> item;
int item; cin >> item;
Declare variable.
C++
for (result in items)
for (result of items)
for...in iterates keys.
JavaScript
fmt.Println 'test'
fmt.Println('test')
Missing parentheses.
Go
let x: number = 'output';
let x: string = 'output';
Fix type.
TypeScript
if count = 82
if count == 82
Use ==.
Ruby
{{"id":"output",}}
{{"id":"output"}}
Remove trailing comma.
JSON
<center>data</center>
<div style='text-align:center;'>data</div>
Use CSS.
HTML
def process puts 'output' end
def process puts 'output' end
Correct.
Ruby
Write-Host 'output'
Write-Host 'output'
Correct.
PowerShell
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
index = world
index = 'world'
Quote strings.
Python
if x = 66
if x == 66
Use ==.
Go
test
test()
Add parentheses.
Swift
console.log('data'
console.log('data')
Close parenthesis.
JavaScript
disp('hello')
disp('hello')
Correct.
MATLAB
.Order {{ color: green; }}
.Order {{ color: green; }}
Correct.
CSS
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
jwt.sign({{id:20}}, 'key');
jwt.sign({{id:20}}, 'key', {{expiresIn:'30m'}});
Add expiration.
Node.js
class User {{ int bar; }} obj.bar=5;
class User {{ public int bar; }} obj.bar=5;
Make field public.
Java
if x = 50 {{}}
if x == 50 {{}}
Use ==.
Swift
cin >> c cout << c;
cin >> c; cout << c;
Add semicolon.
C++
if (bar = 1) {{}}
if (bar == 1) {{}}
Use ==.
Java
53temp = 10
temp53 = 10
Variable cannot start with digit.
Python
for result in range(52) print(result)
for result in range(52): print(result)
Colon after for.
Python
function process(result:string){{return result;}} process(29);
function process(result:string){{return result;}} process('message');
Pass correct type.
TypeScript
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
items[88]
if (items.indices.contains(88)) items[88]
Check index.
Kotlin
values(74)
if length(values) >= 74, values(74), end
Check length.
MATLAB
print 'output'
print 'output';
Add semicolon.
Perl
x := 85
x := 85
Correct.
Go
class = 'world'
class_name = 'world'
'class' is a keyword.
Python
$values[40] = 5;
if (isset($values[40])) $values[40] = 5;
Check existence.
PHP
{{"name":"hello" "age":39}}
{{"name":"hello", "age":39}}
Add comma.
JSON
'7' + 38
7 + 38
Avoid string coercion.
JavaScript
["hello", 76]
["hello", 76]
Correct.
JSON
age: value age: hello,
age: value age: hello
Remove comma.
YAML
with open('config.json') as file_handle: data = file_handle.read()
with open('config.json') as file_handle: data = file_handle.read()
Correct.
Python
#main {{ color: #333; }}
#main {{ color: #333; }}
Correct.
CSS
let num: i32 = "value";
let num: &str = "value";
Type mismatch.
Rust
bar
bar()
Add parentheses.
Kotlin
function render() {{ return {{key:'test'}} }}
function render() {{ return {{key:'test'}}; }}
Return object on same line.
JavaScript
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
int items[23]; items[23]=5;
int items[23]; if(23<23){{}} else items[23]=5;
Bounds check.
C++
values.forEach(function(temp) {{ console.log(temp); }})
values.forEach((temp) => {{ console.log(temp); }})
Arrow functions are cleaner.
JavaScript
def foo(a): return a + 1
def foo(a): return a + 1
Correct.
Python
let mut val=46; let ref1=&mut val; let ref2=&mut val;
let mut val=46; {{ let ref1=&mut val; }} let ref2=&mut val;
Only one mutable borrow.
Rust
for (int i=0; i<79; i++) {{}}
for (int i=0; i<79; i++) {{}}
Correct.
Java