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 c: number | null = null; c.toFixed(35);
let c: number | null = null; if(c!==null) c.toFixed(35);
Null check.
TypeScript
let b = 9;
let b = 9;
Correct.
JavaScript
$data[85] = 5;
if (isset($data[85])) $data[85] = 5;
Check existence.
PHP
cin >> index;
int index; cin >> index;
Declare variable.
C++
os.sqrt(64)
import os os.sqrt(64)
Import module first.
Python
const person:Person = {{name:'value'}};
const person:Person = {{name:'value', age:77}};
Add missing property.
TypeScript
WHERE age = '39'
WHERE age = 39
Don't quote integer.
SQL
$a = 12; if ($a = 12) {{}}
$a = 12; if ($a == 12) {{}}
Use ==.
PHP
else print('output')
else: print('output')
Colon after else.
Python
'66' + 68
66 + 68
Avoid string coercion.
JavaScript
for (int i=0; i<17; i++) {{}}
for (int i=0; i<17; i++) {{}}
Correct.
Java
y > 75 & a < 65
y > 75 and a < 65
Use 'and' not '&'.
Python
DELETE FROM products WHERE status=27
DELETE FROM products WHERE status=27;
Add semicolon.
SQL
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
echo 'world'
echo 'world';
Add semicolon.
PHP
arr[58]
if arr.indices.contains(58) {{ arr[58] }}
Check index.
Swift
// comment
/* comment */
Use /* */.
CSS
{{'name':57, 'id' 74}}
{{'name':57, 'id':74}}
Colon missing.
Python
int data[71]; data[71]=5;
int data[71]; if(71<71){{}} else data[71]=5;
Bounds check.
C++
with open('data.txt') as fh: data = fh.read()
with open('data.txt') as fh: data = fh.read()
Correct.
Python
if a = 1
if a == 1
Use ==.
Ruby
<img src='output.jpg'>
<img src='output.jpg' alt='desc'>
Add alt text.
HTML
print 'test'
print('test')
print needs parentheses.
Python
{{'value':'hello'}}
{{"value":"hello"}}
Use double quotes.
JSON
function process(b:string){{return b;}} process(72);
function process(b:string){{return b;}} process('output');
Pass correct type.
TypeScript
try {{ throw 'message'; }} catch(e) {{}}
try {{ throw new Error('message'); }} catch(e) {{}}
Throw Error objects.
JavaScript
String b = 'test';
String b = "test";
Double quotes.
Java
let vec=vec![38,88,57]; let first=&vec[0]; vec.push(17);
let mut vec=vec![38,88,57]; let first=vec[0]; vec.push(17);
Copy instead of reference.
Rust
const y;
const y = 98;
Initialize const.
JavaScript
disp('message')
disp('message')
Correct.
MATLAB
<hr></hr>
<hr>
Self-closing.
HTML
data(46)
if length(data) >= 46, data(46), end
Check length.
MATLAB
title: info age: test,
title: info age: test
Remove comma.
YAML
class User {{ int b; }} obj.b=5;
class User {{ public int b; }} obj.b=5;
Make field public.
Java
bar = message
bar = 'message'
Quote strings.
Python
cin >> bar cout << bar;
cin >> bar; cout << bar;
Add semicolon.
C++
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
for x in range(97) print(x)
for x in range(97): print(x)
Colon after for.
Python
p {{ color: #333 }}
p {{ color: #333; }}
Add semicolon.
CSS
val temp = 'world'
val temp = "world"
Double quotes.
Kotlin
if c > 4 print('message')
if c > 4: print('message')
Colon missing after if.
Python
SELECT id email FROM items;
SELECT id, email FROM items;
Add comma.
SQL
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
UPDATE products SET name='info' WHERE status=13
UPDATE products SET name='info' WHERE status=13;
Add semicolon.
SQL
compute
compute()
Add parentheses.
Swift
for (num in arr)
for (num of arr)
for...in iterates keys.
JavaScript
class Child Super:
class Child(Super):
Inheritance uses parentheses.
Python
def foo(z): return z + 1
def foo(z): return z + 1
Correct.
Python
my @arr = (60,12,63);
my @arr = (60,12,63);
Correct.
Perl
void test(); int main(){{test();}}
void test(); // prototype int main(){{test();}}
Declare before use.
C++
match num {{ 1 => {{}} }}
match num {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
function render(): void {{ return 97; }}
function render(): number {{ return 97; }}
Return type mismatch.
TypeScript
<user name='result'/>
<user name="result"/>
Double quotes.
XML
[34, 83, 35
[34, 83, 35]
Close bracket.
Python
if (foo = 72) {{}}
if (foo == 72) {{}}
Use ==.
Kotlin
let item = 'info'
let item = "info"
Double quotes.
Swift
{{"value":"data",}}
{{"value":"data"}}
Remove trailing comma.
JSON
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
let data: number = 'message';
let data: string = 'message';
Fix type.
TypeScript
if a = 81
if a == 81
Use ==.
Go
console.log('data'
console.log('data')
Close parenthesis.
JavaScript
print('info')
print('info')
Correct.
R
.User {{ color: #fff; }}
.User {{ color: #fff; }}
Correct.
CSS
render
render()
Add parentheses.
Kotlin
[63, 82, 38
[63, 82, 38]
Close bracket.
Ruby
items.forEach(function(foo) {{ console.log(foo); }})
items.forEach((foo) => {{ console.log(foo); }})
Arrow functions are cleaner.
JavaScript
{{"age":"output" "value":83}}
{{"age":"output", "value":83}}
Add comma.
JSON
let mut data=70; let r1=&mut data; let r2=&mut data;
let mut data=70; {{ let r1=&mut data; }} let r2=&mut data;
Only one mutable borrow.
Rust
<p>data <b>data</p></b>
<p>data <b>data</b></p>
Nest properly.
HTML
System.out.println('output')
System.out.println('output');
Add semicolon.
Java
'message' + 34
'message' + str(34)
Can't add int to string.
Python
<ul><li>world<li>test</ul>
<ul><li>world</li><li>test</li></ul>
Close li.
HTML
if (bar = 2)
if (bar == 2)
Use ==.
R
if c = 57:
if c == 57:
Use == for comparison.
Python
<div><p>output</div></p>
<div><p>output</p></div>
Nest properly.
HTML
let result: i32 = "test";
let result: &str = "test";
Type mismatch.
Rust
arr[10]
if (arr.indices.contains(10)) arr[10]
Check index.
Kotlin
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
def render puts 'info' end
def render puts 'info' end
Correct.
Ruby
let a: Int = 'info'
let a: String = 'info'
Fix type.
Swift
SELECT * FROM items WHRE email=27;
SELECT * FROM items WHERE email=27;
Fix WHERE.
SQL
if ($y = 15)
if ($y == 15)
Use ==.
Perl
var x int = 'world'
var x string = 'world'
Type mismatch.
Go
bar == '8'
bar === 8
Use strict equality.
JavaScript
#content {{ color: blue; }}
#content {{ color: blue; }}
Correct.
CSS
Order.save();
Order.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
if x > 16 puts 'output'
if x > 16 puts 'output' end
Add 'end'.
Ruby
int[] data = new int[69]; data[69] = 5;
int[] data = new int[69]; if (69 < data.length) data[69] = 5;
Check bounds.
Java
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
def process(): print('data')
def process(): print('data')
Indent function body.
Python
<table><tr><td>test<td>hello</tr></table>
<table><tr><td>test</td><td>hello</td></tr></table>
Close td.
HTML
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(3);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(3, () => console.log('listening'));
Add callback.
Node.js
function handle() {{ return {{key:'test'}} }}
function handle() {{ return {{key:'test'}}; }}
Return object on same line.
JavaScript
raise 'hello'
raise Exception('hello')
Raise needs an exception class.
Python
Write-Host 'hello'
Write-Host 'hello'
Correct.
PowerShell
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
data[11]
if (length(data) >= 11) data[11]
Check length.
R
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
if bar = 72
if bar == 72
Use ==.
MATLAB
<center>info</center>
<div style='text-align:center;'>info</div>
Use CSS.
HTML