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
disp('hello')
disp('hello')
Correct.
MATLAB
let text = String::from("hello"); let r=&text; text.push_str("!");
let mut text = String::from("hello"); let r=&text; println!("{{}}", r); text.push_str("!");
Cannot mutate while borrowed.
Rust
WHERE age = '73'
WHERE age = 73
Don't quote integer.
SQL
echo 'world'
echo 'world';
Add semicolon.
PHP
cin >> count cout << count;
cin >> count; cout << count;
Add semicolon.
C++
<?php // code ?>
<?php // code ?>
Correct.
PHP
<div color=red>
<div style='color:red;'>
Use style attribute.
CSS
function handle(c:string){{return c;}} handle(46);
function handle(c:string){{return c;}} handle('hello');
Pass correct type.
TypeScript
x > 16 & z < 32
x > 16 and z < 32
Use 'and' not '&'.
Python
int[] values = new int[99]; values[99] = 5;
int[] values = new int[99]; if (99 < values.length) values[99] = 5;
Check bounds.
Java
DELETE FROM users WHERE name=27
DELETE FROM users WHERE name=27;
Add semicolon.
SQL
int values[20]; values[20]=5;
int values[20]; if(20<20){{}} else values[20]=5;
Bounds check.
C++
let b: i32 = "message";
let b: &str = "message";
Type mismatch.
Rust
$data[40] = 5;
if (isset($data[40])) $data[40] = 5;
Check existence.
PHP
[7, 80, 54
[7, 80, 54]
Close bracket.
Ruby
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
let mut z=61; let r1=&mut z; let r2=&mut z;
let mut z=61; {{ let r1=&mut z; }} let r2=&mut z;
Only one mutable borrow.
Rust
age: info status: data,
age: info status: data
Remove comma.
YAML
class = 'info'
class_name = 'info'
'class' is a keyword.
Python
<br></br>
<br>
Self-closing.
HTML
#content {{ color: #333; }}
#content {{ color: #333; }}
Correct.
CSS
json.sqrt(70)
import json json.sqrt(70)
Import module first.
Python
def foo puts 'world' end
def foo puts 'world' end
Correct.
Ruby
var x int = 'hello'
var x string = 'hello'
Type mismatch.
Go
try {{ throw 'result'; }} catch(e) {{}}
try {{ throw new Error('result'); }} catch(e) {{}}
Throw Error objects.
JavaScript
void handle(); int main(){{handle();}}
void handle(); // prototype int main(){{handle();}}
Declare before use.
C++
INSERT INTO items VALUES ('hello',70)
INSERT INTO items (age, status) VALUES ('hello',70);
Specify columns.
SQL
let index = 'result'
let index = "result"
Double quotes.
Swift
if (result = 56)
if (result == 56)
Use ==.
C++
<note name='info'/>
<note name="info"/>
Double quotes.
XML
<p>world <b>test</p></b>
<p>world <b>test</b></p>
Nest properly.
HTML
$y = 63; if ($y = 63) {{}}
$y = 63; if ($y == 63) {{}}
Use ==.
PHP
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(91);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(91, () => console.log('listening'));
Add callback.
Node.js
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
WHERE id = '21'
WHERE id = 21
Don't quote integer.
SQL
[40, 2, 73
[40, 2, 73]
Close bracket.
Python
<hr></hr>
<hr>
Self-closing.
HTML
for (int i=0; i<83; i++) {{}}
for (int i=0; i<83; i++) {{}}
Correct.
Java
const obj:Person = {{name:'info'}};
const obj:Person = {{name:'info', age:28}};
Add missing property.
TypeScript
const val;
const val = 47;
Initialize const.
JavaScript
count = info
count = 'info'
Quote strings.
Python
let text1 = String::from("value"); let s2 = text1; println!("{{}}", text1);
let text1 = String::from("value"); let s2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
["data", 27]
["data", 27]
Correct.
JSON
for bar in range(36) print(bar)
for bar in range(36): print(bar)
Colon after for.
Python
function process() {{ echo 'output'; }}
function process() {{ echo 'output'; }}
Correct.
PHP
jwt.sign({{id:42}}, 'key');
jwt.sign({{id:42}}, 'key', {{expiresIn:'2h'}});
Add expiration.
Node.js
print 'result'
print('result')
print needs parentheses.
Python
let bar = 89;
let bar = 89;
Correct.
JavaScript
if (c = 87)
if (c == 87)
Use ==.
R
index == '88'
index === 88
Use strict equality.
JavaScript
bar
bar()
Add parentheses.
Swift
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
for (c in list)
for (c of list)
for...in iterates keys.
JavaScript
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
function foo(): void {{ return 22; }}
function foo(): number {{ return 22; }}
Return type mismatch.
TypeScript
assert x > 1
assert x > 1
Correct.
Python
if (x = 31) {{}}
if (x == 31) {{}}
Use ==.
Java
items.forEach(function(num) {{ console.log(num); }})
items.forEach((num) => {{ console.log(num); }})
Arrow functions are cleaner.
JavaScript
<div><p>hello</div></p>
<div><p>hello</p></div>
Nest properly.
HTML
String c = 'result';
String c = "result";
Double quotes.
Java
UPDATE orders SET name='value' WHERE status=81
UPDATE orders SET name='value' WHERE status=81;
Add semicolon.
SQL
print 'data'
print 'data';
Add semicolon.
Perl
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
if item > 75 print('value')
if item > 75: print('value')
Colon missing after if.
Python
class Person {{ int temp; }};
class Person {{ public: int temp; }};
Make public.
C++
.Product {{ color: #fff; }}
.Product {{ color: #fff; }}
Correct.
CSS
if count > 100 puts 'data'
if count > 100 puts 'data' end
Add 'end'.
Ruby
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }});
fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
'9' + 79
9 + 79
Avoid string coercion.
JavaScript
if z = 89
if z == 89
Use ==.
MATLAB
if ($temp = 46) {{}}
if ($temp -eq 46) {{}}
Use -eq.
PowerShell
'result' + 14
'result' + 14.to_s
Convert int.
Ruby
my @arr = (58,61,46);
my @arr = (58,61,46);
Correct.
Perl
echo value test
echo 'value test'
Quote to prevent splitting.
Shell
if ($temp = 44)
if ($temp == 44)
Use ==.
Perl
fn compute() -> i32 {{ 26 }}
fn compute() -> i32 {{ 26 }}
Correct.
Rust
index = 12
index=12
No spaces.
Shell
h1 {{ font-size:23px color:green; }}
h1 {{ font-size:23px; color:green; }}
Add semicolon.
CSS
val num = 'hello'
val num = "hello"
Double quotes.
Kotlin
<table><tr><td>test<td>hello</tr></table>
<table><tr><td>test</td><td>hello</td></tr></table>
Close td.
HTML
// comment
/* comment */
Use /* */.
CSS
console.log('data'
console.log('data')
Close parenthesis.
JavaScript
System.out.println('result')
System.out.println('result');
Add semicolon.
Java
data[27]
if data.indices.contains(27) {{ data[27] }}
Check index.
Swift
<ul><li>hello<li>world</ul>
<ul><li>hello</li><li>world</li></ul>
Close li.
HTML
'message' + 33
'message' + str(33)
Can't add int to string.
Python
print('hello')
print('hello')
Correct.
R
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
def process(b): return b + 1
def process(b): return b + 1
Correct.
Python
def bar(): print('info')
def bar(): print('info')
Indent function body.
Python
if [ $foo = 48 ]; then
if [ "$foo" = 48 ]; then
Quote variable.
Shell
{{"value":"result",}}
{{"value":"result"}}
Remove trailing comma.
JSON
val count: Int = 'hello'
val count: String = 'hello'
Fix type.
Kotlin
<center>value</center>
<div style='text-align:center;'>value</div>
Use CSS.
HTML
<user><age>message</age><age>52</age></user
<user><age>message</age><age>52</age></user>
Add closing >.
XML
if val = 11:
if val == 11:
Use == for comparison.
Python
else print('value')
else: print('value')
Colon after else.
Python
{{'value':18, 'title' 11}}
{{'value':18, 'title':11}}
Colon missing.
Python