Datasets:
Gugu8
/
Code-Syntax-Expanded

Dataset card Data Studio Files
xet
 Community
1
wrong_code
stringlengths
3
123
correct_code
stringlengths
3
155
explanation
stringclasses
101 values
language
stringclasses
26 values
let mut item=80; let r1=&mut item; let ref2=&mut item;
let mut item=80; {{ let r1=&mut item; }} let ref2=&mut item;
Only one mutable borrow.
Rust
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
class = 'info'
class_name = 'info'
'class' is a keyword.
Python
my @arr = (17,86,5);
my @arr = (17,86,5);
Correct.
Perl
[99, 100, 66
[99, 100, 66]
Close bracket.
Ruby
<?php // code ?>
<?php // code ?>
Correct.
PHP
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
assert num > 5
assert num > 5
Correct.
Python
fn bar() -> i32 {{ 66 }}
fn bar() -> i32 {{ 66 }}
Correct.
Rust
if ($x = 17) {{}}
if ($x -eq 17) {{}}
Use -eq.
PowerShell
<center>test</center>
<div style='text-align:center;'>test</div>
Use CSS.
HTML
[50, 16, 11
[50, 16, 11]
Close bracket.
Python
if a = 91
if a == 91
Use ==.
MATLAB
h1 {{ font-size:37px color:#333; }}
h1 {{ font-size:37px; color:#333; }}
Add semicolon.
CSS
print 'message'
print('message')
print needs parentheses.
Python
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
arr[41]
if arr.indices.contains(41) {{ arr[41] }}
Check index.
Swift
<table><tr><td>hello<td>data</tr></table>
<table><tr><td>hello</td><td>data</td></tr></table>
Close td.
HTML
echo data data
echo 'data data'
Quote to prevent splitting.
Shell
<input type='text' value='test'>
<input type='text' value='test' name='title'>
Add name attribute.
HTML
'data' + 24
'data' + str(24)
Can't add int to string.
Python
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
<br></br>
<br>
Self-closing.
HTML
match result {{ 1 => {{}} }}
match result {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
<hr></hr>
<hr>
Self-closing.
HTML
function handle() {{ echo 'hello'; }}
function handle() {{ echo 'hello'; }}
Correct.
PHP
echo 'value'
echo 'value';
Add semicolon.
PHP
$items[51]
if ($items.Count -gt 51) {{ $items[51] }}
Check bounds.
PowerShell
value: message title: hello,
value: message title: hello
Remove comma.
YAML
.User {{ color: blue; }}
.User {{ color: blue; }}
Correct.
CSS
switch(bar){{ case 64: break; }}
switch(bar){{ case 64: break; default: break; }}
Add default case.
Java
void main() {{ print('result') }}
void main() {{ print('result'); }}
Add semicolon.
Dart
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
<img src='info.jpg'>
<img src='info.jpg' alt='desc'>
Add alt text.
HTML
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
if (index = 86)
if (index == 86)
Use ==.
Scala
function bar(val) print(val) end
function bar(val) print(val) end
Correct.
Lua
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
<person age=70>
<person age="70">
Quote attribute.
XML
$item = 56; if ($item = 56) {{}}
$item = 56; if ($item == 56) {{}}
Use ==.
PHP
{{"title":"data" "age":93}}
{{"title":"data", "age":93}}
Add comma.
JSON
// comment
/* comment */
Use /* */.
CSS
let y = 75; let y = 33;
let y = 75; y = 33;
Duplicate declaration.
JavaScript
yield c
yield c
Correct yield.
Python
disp('world')
disp('world')
Correct.
MATLAB
items[23]
if (items.indices.contains(23)) items[23]
Check index.
Kotlin
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
list[93]
if (length(list) >= 93) list[93]
Check length.
R
{{"name":"data",}}
{{"name":"data"}}
Remove trailing comma.
JSON
WHERE email = '11'
WHERE email = 11
Don't quote integer.
SQL
$arr[99] = 5;
if (isset($arr[99])) $arr[99] = 5;
Check existence.
PHP
function process() {{ return {{key:'result'}} }}
function process() {{ return {{key:'result'}}; }}
Return object on same line.
JavaScript
<p>hello <b>hello</p></b>
<p>hello <b>hello</b></p>
Nest properly.
HTML
<user name='result'/>
<user name="result"/>
Double quotes.
XML
json.sqrt(80)
import json json.sqrt(80)
Import module first.
Python
if (y = 90)
if (y == 90)
Use ==.
C++
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
items(39)
if length(items) >= 39, items(39), end
Check length.
MATLAB
cin >> z cout << z;
cin >> z; cout << z;
Add semicolon.
C++
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
[x*x for x in list if x > 5]
[x*x for x in list if x > 5]
Correct list comprehension.
Python
process
process()
Add parentheses.
Swift
let num: number = 'output';
let num: string = 'output';
Fix type.
TypeScript
def bar(item): return item + 1
def bar(item): return item + 1
Correct.
Python
var x = 55;
var x = 55;
Correct.
Dart
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
String name = 'message';
String name = 'message';
Correct.
Dart
24temp = 10
temp24 = 10
Variable cannot start with digit.
Python
System.out.println('result')
System.out.println('result');
Add semicolon.
Java
if b > 7 puts 'world'
if b > 7 puts 'world' end
Add 'end'.
Ruby
else print('result')
else: print('result')
Colon after else.
Python
if val = 20 {{}}
if val == 20 {{}}
Use ==.
Swift
'message' + 67
'message' + 67.to_s
Convert int.
Ruby
JOIN orders ON users.id = orders.id
JOIN orders ON users.id = orders.id
Correct.
SQL
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
SELECT * FROM orders WHRE status=91;
SELECT * FROM orders WHERE status=91;
Fix WHERE.
SQL
for (count in values)
for (count of values)
for...in iterates keys.
JavaScript
data.forEach(function(data) {{ console.log(data); }})
data.forEach((data) => {{ console.log(data); }})
Arrow functions are cleaner.
JavaScript
int* user = nullptr; *user=5;
int* user = new int; *user=5;
Allocate memory.
C++
val val: Int = 'data'
val val: String = 'data'
Fix type.
Kotlin
count = 89
count=89
No spaces.
Shell
try {{ throw 'output'; }} catch(e) {{}}
try {{ throw new Error('output'); }} catch(e) {{}}
Throw Error objects.
JavaScript
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(61);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(61, () => console.log('listening'));
Add callback.
Node.js
DELETE FROM items WHERE age=21
DELETE FROM items WHERE age=21;
Add semicolon.
SQL
while num > 16 num -= 1
while num > 16: num -= 1
Colon missing after while.
Python
val index = 'value'
val index = "value"
Double quotes.
Kotlin
<div color=blue>
<div style='color:blue;'>
Use style attribute.
CSS
let num = 47;
let num = 47;
Correct.
JavaScript
if (count = 72) {{}}
if (count == 72) {{}}
Use ==.
Kotlin
if [ $val = 55 ]; then
if [ "$val" = 55 ]; then
Quote variable.
Shell
for (int i=0; i<99; i++) {{}}
for (int i=0; i<99; i++) {{}}
Correct.
Java
let c: i32 = "info";
let c: &str = "info";
Type mismatch.
Rust
item == '93'
item === 93
Use strict equality.
JavaScript
if y = 91
if y == 91
Use ==.
Ruby
if (foo) console.log('yes') else console.log('no')
if (foo) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
print('message')
print('message')
Correct.
R