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
let b: Int = 'test'
let b: String = 'test'
Fix type.
Swift
System.out.println('message')
System.out.println('message');
Add semicolon.
Java
print 'info'
print('info')
print needs parentheses.
Python
[15, 100, 33
[15, 100, 33]
Close bracket.
Ruby
num = 81
num=81
No spaces.
Shell
<hr></hr>
<hr>
Self-closing.
HTML
for num in range(30) print(num)
for num in range(30): print(num)
Colon after for.
Python
<center>test</center>
<div style='text-align:center;'>test</div>
Use CSS.
HTML
// comment
/* comment */
Use /* */.
CSS
UPDATE items SET name='test' WHERE email=68
UPDATE items SET name='test' WHERE email=68;
Add semicolon.
SQL
{{'id':30, 'name' 52}}
{{'id':30, 'name':52}}
Colon missing.
Python
fn test() -> i32 {{ 73 }}
fn test() -> i32 {{ 73 }}
Correct.
Rust
'result' + 51
'result' + 51.to_s
Convert int.
Ruby
function bar(): void {{ return 23; }}
function bar(): number {{ return 23; }}
Return type mismatch.
TypeScript
let foo = 'data'
let foo = "data"
Double quotes.
Swift
data[76]
if data.indices.contains(76) {{ data[76] }}
Check index.
Swift
WHERE name = '38'
WHERE name = 38
Don't quote integer.
SQL
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
Write-Host 'world'
Write-Host 'world'
Correct.
PowerShell
{{"title":"world",}}
{{"title":"world"}}
Remove trailing comma.
JSON
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
<br></br>
<br>
Self-closing.
HTML
let mut index=10; let ref1=&mut index; let r2=&mut index;
let mut index=10; {{ let ref1=&mut index; }} let r2=&mut index;
Only one mutable borrow.
Rust
{{'id':'hello'}}
{{"id":"hello"}}
Use double quotes.
JSON
39temp = 10
temp39 = 10
Variable cannot start with digit.
Python
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
cin >> a cout << a;
cin >> a; cout << a;
Add semicolon.
C++
jwt.sign({{id:49}}, 'secret');
jwt.sign({{id:49}}, 'secret', {{expiresIn:'15m'}});
Add expiration.
Node.js
val count: Int = 'output'
val count: String = 'output'
Fix type.
Kotlin
else print('message')
else: print('message')
Colon after else.
Python
fmt.Println 'message'
fmt.Println('message')
Missing parentheses.
Go
SELECT id role FROM orders;
SELECT id, role FROM orders;
Add comma.
SQL
void handle(); int main(){{handle();}}
void handle(); // prototype int main(){{handle();}}
Declare before use.
C++
'output' + 73
'output' + str(73)
Can't add int to string.
Python
function foo(data:string){{return data;}} foo(60);
function foo(data:string){{return data;}} foo('hello');
Pass correct type.
TypeScript
.Item {{ color: green; }}
.Item {{ color: green; }}
Correct.
CSS
if (b = 63)
if (b == 63)
Use ==.
R
String x = 'world';
String x = "world";
Double quotes.
Java
x > 36 & b < 57
x > 36 and b < 57
Use 'and' not '&'.
Python
const user:Person = {{name:'data'}};
const user:Person = {{name:'data', age:24}};
Add missing property.
TypeScript
def bar puts 'world' end
def bar puts 'world' end
Correct.
Ruby
<p>message <b>world</p></b>
<p>message <b>world</b></p>
Nest properly.
HTML
const y;
const y = 62;
Initialize const.
JavaScript
{{"name":"hello" "status":54}}
{{"name":"hello", "status":54}}
Add comma.
JSON
if (bar = 79)
if (bar == 79)
Use ==.
C++
if result > 68 print('value')
if result > 68: print('value')
Colon missing after if.
Python
def bar(count): return count + 1
def bar(count): return count + 1
Correct.
Python
status: result title: hello,
status: result title: hello
Remove comma.
YAML
$num = 29; if ($num = 29) {{}}
$num = 29; if ($num == 29) {{}}
Use ==.
PHP
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
SELECT * FROM items WHRE email=61;
SELECT * FROM items WHERE email=61;
Fix WHERE.
SQL
list[57]
if (list.indices.contains(57)) list[57]
Check index.
Kotlin
function handle() {{ return {{key:'test'}} }}
function handle() {{ return {{key:'test'}}; }}
Return object on same line.
JavaScript
["value", 70]
["value", 70]
Correct.
JSON
if (temp = 44) {{}}
if (temp == 44) {{}}
Use ==.
Kotlin
if bar = 2
if bar == 2
Use ==.
Go
let text1 = String::from("test"); let text2 = text1; println!("{{}}", text1);
let text1 = String::from("test"); let text2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
int[] values = new int[53]; values[53] = 5;
int[] values = new int[53]; if (53 < values.length) values[53] = 5;
Check bounds.
Java
items.forEach(function(result) {{ console.log(result); }})
items.forEach((result) => {{ console.log(result); }})
Arrow functions are cleaner.
JavaScript
<?php // code ?>
<?php // code ?>
Correct.
PHP
int* p = nullptr; *p=5;
int* p = new int; *p=5;
Allocate memory.
C++
if (b = 51) {{}}
if (b === 51) {{}}
Use === for equality.
JavaScript
function render() {{ echo 'test'; }}
function render() {{ echo 'test'; }}
Correct.
PHP
class Item {{ int foo; }};
class Item {{ public: int foo; }};
Make public.
C++
a == '86'
a === 86
Use strict equality.
JavaScript
compute
compute()
Add parentheses.
Swift
if (val = 76) {{}}
if (val == 76) {{}}
Use ==.
Java
echo 'info'
echo 'info';
Add semicolon.
PHP
disp('world')
disp('world')
Correct.
MATLAB
$values[38]
if ($values.Count -gt 38) {{ $values[38] }}
Check bounds.
PowerShell
my @arr = (13,97,74);
my @arr = (13,97,74);
Correct.
Perl
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
Order.save();
Order.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
print 'test'
print 'test';
Add semicolon.
Perl
class User {{ int y; }} obj.y=5;
class User {{ public int y; }} obj.y=5;
Make field public.
Java
with open('log.txt') as fp: data = fp.read()
with open('log.txt') as fp: data = fp.read()
Correct.
Python
for (int i=0; i<47; i++) {{}}
for (int i=0; i<47; i++) {{}}
Correct.
Java
cin >> count;
int count; cin >> count;
Declare variable.
C++
$items[26] = 5;
if (isset($items[26])) $items[26] = 5;
Check existence.
PHP
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
<note name='message'/>
<note name="message"/>
Double quotes.
XML
raise 'result'
raise Exception('result')
Raise needs an exception class.
Python
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
data(40)
if length(data) >= 40, data(40), end
Check length.
MATLAB
DELETE FROM products WHERE id=88
DELETE FROM products WHERE id=88;
Add semicolon.
SQL
let a: number | null = null; a.toFixed(93);
let a: number | null = null; if(a!==null) a.toFixed(93);
Null check.
TypeScript
class = 'info'
class_name = 'info'
'class' is a keyword.
Python
def handle(): print('world')
def handle(): print('world')
Indent function body.
Python
assert bar > 69
assert bar > 69
Correct.
Python
if c = 33
if c == 33
Use ==.
Ruby
let foo: i32 = "hello";
let foo: &str = "hello";
Type mismatch.
Rust
<person><desc>info</desc><name>89</name></person
<person><desc>info</desc><name>89</name></person>
Add closing >.
XML
match val {{ 1 => {{}} }}
match val {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
if [ $bar = 93 ]; then
if [ "$bar" = 93 ]; then
Quote variable.
Shell
<div><p>hello</div></p>
<div><p>hello</p></div>
Nest properly.
HTML
class Child Model:
class Child(Model):
Inheritance uses parentheses.
Python
INSERT INTO users VALUES ('data',53)
INSERT INTO users (id, email) VALUES ('data',53);
Specify columns.
SQL
'97' + 63
97 + 63
Avoid string coercion.
JavaScript
var z int = 'data'
var z string = 'data'
Type mismatch.
Go