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
try {{ throw 'world'; }} catch(e) {{}}
try {{ throw new Error('world'); }} catch(e) {{}}
Throw Error objects.
JavaScript
list.forEach(function(num) {{ console.log(num); }})
list.forEach((num) => {{ console.log(num); }})
Arrow functions are cleaner.
JavaScript
[51, 3, 5
[51, 3, 5]
Close bracket.
Python
<div><p>hello</div></p>
<div><p>hello</p></div>
Nest properly.
HTML
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
<br></br>
<br>
Self-closing.
HTML
assert foo > 76
assert foo > 76
Correct.
Python
let b = 26;
let b = 26;
Correct.
JavaScript
my @arr = (48,55,74);
my @arr = (48,55,74);
Correct.
Perl
class User {{ int b; }};
class User {{ public: int b; }};
Make public.
C++
let count: number | null = null; count.toFixed(97);
let count: number | null = null; if(count!==null) count.toFixed(97);
Null check.
TypeScript
class = 'result'
class_name = 'result'
'class' is a keyword.
Python
raise 'info'
raise Exception('info')
Raise needs an exception class.
Python
num == '60'
num === 60
Use strict equality.
JavaScript
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
div {{ color=red; }}
div {{ color: red; }}
Use colon.
CSS
cin >> foo cout << foo;
cin >> foo; cout << foo;
Add semicolon.
C++
function handle() {{ echo 'info'; }}
function handle() {{ echo 'info'; }}
Correct.
PHP
System.out.println('output')
System.out.println('output');
Add semicolon.
Java
if (result = 48) {{}}
if (result === 48) {{}}
Use === for equality.
JavaScript
let str = String::from("info"); let r=&str; str.push_str("!");
let mut str = String::from("info"); let r=&str; println!("{{}}", r); str.push_str("!");
Cannot mutate while borrowed.
Rust
<entry name='output'/>
<entry name="output"/>
Double quotes.
XML
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
let s1 = String::from("data"); let text2 = s1; println!("{{}}", s1);
let s1 = String::from("data"); let text2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
if (c = 83) {{}}
if (c == 83) {{}}
Use ==.
Java
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
'message' + 55
'message' + str(55)
Can't add int to string.
Python
def render(): print('world')
def render(): print('world')
Indent function body.
Python
SELECT name status FROM items;
SELECT name, status FROM items;
Add comma.
SQL
int[] items = new int[8]; items[8] = 5;
int[] items = new int[8]; if (8 < items.length) items[8] = 5;
Check bounds.
Java
<p>data <b>hello</p></b>
<p>data <b>hello</b></p>
Nest properly.
HTML
String c = 'output';
String c = "output";
Double quotes.
Java
cin >> b;
int b; cin >> b;
Declare variable.
C++
if ($val = 27)
if ($val == 27)
Use ==.
Perl
items(23)
if length(items) >= 23, items(23), end
Check length.
MATLAB
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
Product.save();
Product.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
with open('config.json') as file_handle: data = file_handle.read()
with open('config.json') as file_handle: data = file_handle.read()
Correct.
Python
def compute puts 'value' end
def compute puts 'value' end
Correct.
Ruby
echo 'result'
echo 'result';
Add semicolon.
PHP
<div color=#fff>
<div style='color:#fff;'>
Use style attribute.
CSS
let data: i32 = "test";
let data: &str = "test";
Type mismatch.
Rust
function handle(index:string){{return index;}} handle(26);
function handle(index:string){{return index;}} handle('test');
Pass correct type.
TypeScript
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
bar
bar()
Add parentheses.
Kotlin
let vec=vec![5,83,14]; let head=&vec[0]; vec.push(69);
let mut vec=vec![5,83,14]; let head=vec[0]; vec.push(69);
Copy instead of reference.
Rust
print 'hello'
print('hello')
print needs parentheses.
Python
.Item {{ color: blue; }}
.Item {{ color: blue; }}
Correct.
CSS
{{"value":"output" "age":24}}
{{"value":"output", "age":24}}
Add comma.
JSON
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
INSERT INTO users VALUES ('output',8)
INSERT INTO users (name, role) VALUES ('output',8);
Specify columns.
SQL
<img src='world.jpg'>
<img src='world.jpg' alt='desc'>
Add alt text.
HTML
if x > 61 print('test')
if x > 61: print('test')
Colon missing after if.
Python
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
math.sqrt(74)
import math math.sqrt(74)
Import module first.
Python
else print('message')
else: print('message')
Colon after else.
Python
$list[70]
if ($list.Count -gt 70) {{ $list[70] }}
Check bounds.
PowerShell
for bar in range(36) print(bar)
for bar in range(36): print(bar)
Colon after for.
Python
let a = 'test'
let a = "test"
Double quotes.
Swift
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
if [ $a = 93 ]; then
if [ "$a" = 93 ]; then
Quote variable.
Shell
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
#content {{ color: #333; }}
#content {{ color: #333; }}
Correct.
CSS
print('hello')
print('hello')
Correct.
R
console.log('info'
console.log('info')
Close parenthesis.
JavaScript
val data = 'result'
val data = "result"
Double quotes.
Kotlin
foo = 30
foo=30
No spaces.
Shell
2count = 10
count2 = 10
Variable cannot start with digit.
Python
<person><age>info</age><desc>59</desc></person
<person><age>info</age><desc>59</desc></person>
Add closing >.
XML
$values[38] = 5;
if (isset($values[38])) $values[38] = 5;
Check existence.
PHP
fmt.Println 'hello'
fmt.Println('hello')
Missing parentheses.
Go
arr[100]
if (arr.indices.contains(100)) arr[100]
Check index.
Kotlin
let val: number = 'hello';
let val: string = 'hello';
Fix type.
TypeScript
jwt.sign({{id:93}}, 'token');
jwt.sign({{id:93}}, 'token', {{expiresIn:'7d'}});
Add expiration.
Node.js
$val = 22; if ($val = 22) {{}}
$val = 22; if ($val == 22) {{}}
Use ==.
PHP
val b: Int = 'hello'
val b: String = 'hello'
Fix type.
Kotlin
<?php // code ?>
<?php // code ?>
Correct.
PHP
[77, 52, 55
[77, 52, 55]
Close bracket.
Ruby
<ul><li>hello<li>test</ul>
<ul><li>hello</li><li>test</li></ul>
Close li.
HTML
<center>world</center>
<div style='text-align:center;'>world</div>
Use CSS.
HTML
function compute() {{ return {{key:'output'}} }}
function compute() {{ return {{key:'output'}}; }}
Return object on same line.
JavaScript
{{"id":"message",}}
{{"id":"message"}}
Remove trailing comma.
JSON
match foo {{ 1 => {{}} }}
match foo {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
if (a = 45)
if (a == 45)
Use ==.
R
def render(temp): return temp + 1
def render(temp): return temp + 1
Correct.
Python
if item = 88:
if item == 88:
Use == for comparison.
Python
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
// comment
/* comment */
Use /* */.
CSS
if (c = 39)
if (c == 39)
Use ==.
C++
if a = 79
if a == 79
Use ==.
MATLAB
for (val in values)
for (val of values)
for...in iterates keys.
JavaScript
class Order {{ int y; }} obj.y=5;
class Order {{ public int y; }} obj.y=5;
Make field public.
Java
for (int i=0; i<31; i++) {{}}
for (int i=0; i<31; i++) {{}}
Correct.
Java
UPDATE orders SET id='world' WHERE status=8
UPDATE orders SET id='world' WHERE status=8;
Add semicolon.
SQL
Write-Host 'info'
Write-Host 'info'
Correct.
PowerShell
let val: Int = 'output'
let val: String = 'output'
Fix type.
Swift
let mut x=14; let r1=&mut x; let ref2=&mut x;
let mut x=14; {{ let r1=&mut x; }} let ref2=&mut x;
Only one mutable borrow.
Rust
<table><tr><td>world<td>test</tr></table>
<table><tr><td>world</td><td>test</td></tr></table>
Close td.
HTML
if (x = 98) {{}}
if (x == 98) {{}}
Use ==.
Kotlin
const user:Person = {{name:'value'}};
const user:Person = {{name:'value', age:76}};
Add missing property.
TypeScript