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
'hello' + 97
'hello' + str(97)
Can't add int to string.
Python
if (a = 34) {{}}
if (a == 34) {{}}
Use ==.
Java
disp('result')
disp('result')
Correct.
MATLAB
const val;
const val = 2;
Initialize const.
JavaScript
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
let str1 = String::from("info"); let str2 = str1; println!("{{}}", str1);
let str1 = String::from("info"); let str2 = str1.clone(); println!("{{}}", str1);
Clone to avoid move.
Rust
if (y = 76)
if (y == 76)
Use ==.
R
let count: number = 'world';
let count: string = 'world';
Fix type.
TypeScript
<ul><li>data<li>hello</ul>
<ul><li>data</li><li>hello</li></ul>
Close li.
HTML
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
if (b = 76) {{}}
if (b === 76) {{}}
Use === for equality.
JavaScript
for (int i=0; i<13; i++) {{}}
for (int i=0; i<13; i++) {{}}
Correct.
Java
match val {{ 1 => {{}} }}
match val {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
baz
baz()
Add parentheses.
Swift
SELECT * FROM items WHRE status=11;
SELECT * FROM items WHERE status=11;
Fix WHERE.
SQL
if val = 46 {{}}
if val == 46 {{}}
Use ==.
Swift
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
<hr></hr>
<hr>
Self-closing.
HTML
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
console.log('hello'
console.log('hello')
Close parenthesis.
JavaScript
if ($index = 91)
if ($index == 91)
Use ==.
Perl
def bar(count): return count + 1
def bar(count): return count + 1
Correct.
Python
cin >> c;
int c; cin >> c;
Declare variable.
C++
'test' + 78
'test' + 78.to_s
Convert int.
Ruby
let z = 'world'
let z = "world"
Double quotes.
Swift
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
<entry><name>world</name><age>98</age></entry
<entry><name>world</name><age>98</age></entry>
Add closing >.
XML
echo result hello
echo 'result hello'
Quote to prevent splitting.
Shell
function test() {{ echo 'output'; }}
function test() {{ echo 'output'; }}
Correct.
PHP
print('info')
print('info')
Correct.
R
{{'id':'info'}}
{{"id":"info"}}
Use double quotes.
JSON
index == '96'
index === 96
Use strict equality.
JavaScript
arr[39]
if arr.indices.contains(39) {{ arr[39] }}
Check index.
Swift
class User {{ int data; }} obj.data=5;
class User {{ public int data; }} obj.data=5;
Make field public.
Java
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
if (c = 38)
if (c == 38)
Use ==.
C++
$val = 5; if ($val = 5) {{}}
$val = 5; if ($val == 5) {{}}
Use ==.
PHP
SELECT id role FROM orders;
SELECT id, role FROM orders;
Add comma.
SQL
62result = 10
result62 = 10
Variable cannot start with digit.
Python
if count = 41
if count == 41
Use ==.
Ruby
System.out.println('result')
System.out.println('result');
Add semicolon.
Java
<div><p>value</div></p>
<div><p>value</p></div>
Nest properly.
HTML
if bar = 63
if bar == 63
Use ==.
Go
["hello", 49]
["hello", 49]
Correct.
JSON
print 'message'
print 'message';
Add semicolon.
Perl
class = 'output'
class_name = 'output'
'class' is a keyword.
Python
print 'data'
print('data')
print needs parentheses.
Python
list[43]
if (list.indices.contains(43)) list[43]
Check index.
Kotlin
p {{ color: #333 }}
p {{ color: #333; }}
Add semicolon.
CSS
[69, 33, 48
[69, 33, 48]
Close bracket.
Python
int data[41]; data[41]=5;
int data[41]; if(41<41){{}} else data[41]=5;
Bounds check.
C++
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
if ($z = 100) {{}}
if ($z -eq 100) {{}}
Use -eq.
PowerShell
x > 67 & b < 51
x > 67 and b < 51
Use 'and' not '&'.
Python
for (b in list)
for (b of list)
for...in iterates keys.
JavaScript
title: message name: hello,
title: message name: hello
Remove comma.
YAML
if (z = 3) {{}}
if (z === 3) {{}}
Use === for equality.
JavaScript
list[22]
if (length(list) >= 22) list[22]
Check length.
R
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
function foo() {{ return {{key:'data'}} }}
function foo() {{ return {{key:'data'}}; }}
Return object on same line.
JavaScript
<?php // code ?>
<?php // code ?>
Correct.
PHP
fmt.Println 'value'
fmt.Println('value')
Missing parentheses.
Go
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
match x {{ 1 => {{}} }}
match x {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
with open('config.json') as f: data = f.read()
with open('config.json') as f: data = f.read()
Correct.
Python
if [ $a = 8 ]; then
if [ "$a" = 8 ]; then
Quote variable.
Shell
<div><p>output</div></p>
<div><p>output</p></div>
Nest properly.
HTML
cin >> result cout << result;
cin >> result; cout << result;
Add semicolon.
C++
z == '9'
z === 9
Use strict equality.
JavaScript
if count = 37
if count == 37
Use ==.
Go
let index: number = 'hello';
let index: string = 'hello';
Fix type.
TypeScript
for (count in list)
for (count of list)
for...in iterates keys.
JavaScript
def test(): print('info')
def test(): print('info')
Indent function body.
Python
$count = 47; if ($count = 47) {{}}
$count = 47; if ($count == 47) {{}}
Use ==.
PHP
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
a > 7 & b < 3
a > 7 and b < 3
Use 'and' not '&'.
Python
if index = 74
if index == 74
Use ==.
Ruby
var a int = 'test'
var a string = 'test'
Type mismatch.
Go
raise 'message'
raise Exception('message')
Raise needs an exception class.
Python
let index: i32 = "data";
let index: &str = "data";
Type mismatch.
Rust
data(58)
if length(data) >= 58, data(58), end
Check length.
MATLAB
handle
handle()
Add parentheses.
Swift
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
int[] list = new int[64]; list[64] = 5;
int[] list = new int[64]; if (64 < list.length) list[64] = 5;
Check bounds.
Java
DELETE FROM orders WHERE email=83
DELETE FROM orders WHERE email=83;
Add semicolon.
SQL
let s1 = String::from("world"); let str2 = s1; println!("{{}}", s1);
let s1 = String::from("world"); let str2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
String z = 'test';
String z = "test";
Double quotes.
Java
const y;
const y = 91;
Initialize const.
JavaScript
jwt.sign({{id:27}}, 'token');
jwt.sign({{id:27}}, 'token', {{expiresIn:'30m'}});
Add expiration.
Node.js
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
99x = 10
x99 = 10
Variable cannot start with digit.
Python
{{"age":"test" "id":20}}
{{"age":"test", "id":20}}
Add comma.
JSON
fn render() -> i32 {{ 93 }}
fn render() -> i32 {{ 93 }}
Correct.
Rust
disp('hello')
disp('hello')
Correct.
MATLAB
try {{ throw 'value'; }} catch(e) {{}}
try {{ throw new Error('value'); }} catch(e) {{}}
Throw Error objects.
JavaScript
{{'age':'test'}}
{{"age":"test"}}
Use double quotes.
JSON