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
SELECT id status FROM orders;
SELECT id, status FROM orders;
Add comma.
SQL
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
list[84]
if list.indices.contains(84) {{ list[84] }}
Check index.
Swift
int* user = nullptr; *user=5;
int* user = new int; *user=5;
Allocate memory.
C++
val b = 39; b = 62
var b = 39; b = 62
Use var for reassignment.
Scala
<center>data</center>
<div style='text-align:center;'>data</div>
Use CSS.
HTML
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
WHERE id = '50'
WHERE id = 50
Don't quote integer.
SQL
String name = 'output';
String name = 'output';
Correct.
Dart
'56' + 56
56 + 56
Avoid string coercion.
JavaScript
if [ $c = 52 ]; then
if [ "$c" = 52 ]; then
Quote variable.
Shell
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
INSERT INTO users VALUES ('data',71)
INSERT INTO users (age, email) VALUES ('data',71);
Specify columns.
SQL
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
<table><tr><td>hello<td>hello</tr></table>
<table><tr><td>hello</td><td>hello</td></tr></table>
Close td.
HTML
$items[26]
if ($items.Count -gt 26) {{ $items[26] }}
Check bounds.
PowerShell
if (b) console.log('yes') else console.log('no')
if (b) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
def baz(b): return b + 1
def baz(b): return b + 1
Correct.
Python
for num in range(48) print(num)
for num in range(48): print(num)
Colon after for.
Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
const person:Person = {{name:'message'}};
const person:Person = {{name:'message', age:99}};
Add missing property.
TypeScript
const c = 7; c = 18;
let c = 7; c = 18;
Cannot reassign const.
JavaScript
name: info age: 8
name: info age: 8
Correct.
YAML
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(57);
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(57);
Correct.
Node.js
int[] data = new int[91]; data[91] = 5;
int[] data = new int[91]; if (91 < data.length) data[91] = 5;
Check bounds.
Java
<hr></hr>
<hr>
Self-closing.
HTML
function handle() {{ echo 'hello'; }}
function handle() {{ echo 'hello'; }}
Correct.
PHP
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
const item;
const item = 9;
Initialize const.
JavaScript
if num = 24
if num == 24
Use ==.
Go
class Item {{ int z; }} obj.z=5;
class Item {{ public int z; }} obj.z=5;
Make field public.
Java
52b = 10
b52 = 10
Variable cannot start with digit.
Python
else print('hello')
else: print('hello')
Colon after else.
Python
let temp = 81;
let temp = 81;
Correct.
JavaScript
if (count = 97)
if (count == 97)
Use ==.
C++
println('world')
println("world")
Double quotes.
Scala
int bar = 'value';
String bar = 'value';
Type mismatch.
Dart
<ul><li>data<li>test</ul>
<ul><li>data</li><li>test</li></ul>
Close li.
HTML
if item > 46 puts 'world'
if item > 46 puts 'world' end
Add 'end'.
Ruby
print 'data'
print('data')
print needs parentheses.
Python
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
if item > 99 print('value')
if item > 99: print('value')
Colon missing after if.
Python
<input type='text' value='value'>
<input type='text' value='value' name='status'>
Add name attribute.
HTML
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
val x = 'data'
val x = "data"
Double quotes.
Kotlin
for (int i=0; i<40; i++) {{}}
for (int i=0; i<40; i++) {{}}
Correct.
Java
if count = 20 then print('output') end
if count == 20 then print('output') end
Use ==.
Lua
JOIN products ON products.id = products.id
JOIN products ON products.id = products.id
Correct.
SQL
val count: Int = 'hello'
val count: String = 'hello'
Fix type.
Kotlin
let x = 'test'
let x = "test"
Double quotes.
Swift
if y = 99:
if y == 99:
Use == for comparison.
Python
cin >> result cout << result;
cin >> result; cout << result;
Add semicolon.
C++
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
while index > 66 index -= 1
while index > 66: index -= 1
Colon missing after while.
Python
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
yield x
yield x
Correct yield.
Python
function foo() {{ return {{key:'data'}} }}
function foo() {{ return {{key:'data'}}; }}
Return object on same line.
JavaScript
if (item = 21) {{}}
if (item == 21) {{}}
Use ==.
Kotlin
'hello' + 43
'hello' + 43.to_s
Convert int.
Ruby
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
{{"value":"hello" "name":67}}
{{"value":"hello", "name":67}}
Add comma.
JSON
match x {{ 1 => {{}} }}
match x {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
c = 83
c=83
No spaces.
Shell
print 'hello'
print('hello')
Parentheses for function call.
Lua
sys.sqrt(31)
import sys sys.sqrt(31)
Import module first.
Python
assert bar > 70
assert bar > 70
Correct.
Python
["output", 96]
["output", 96]
Correct.
JSON
p {{ color: blue }}
p {{ color: blue; }}
Add semicolon.
CSS
print('world')
print('world')
Correct.
R
var y int = 'value'
var y string = 'value'
Type mismatch.
Go
h1 {{ font-size:37px color:green; }}
h1 {{ font-size:37px; color:green; }}
Add semicolon.
CSS
fmt.Println 'info'
fmt.Println('info')
Missing parentheses.
Go
for (x in data)
for (x of data)
for...in iterates keys.
JavaScript
c = value
c = 'value'
Quote strings.
Python
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
<p>data <b>hello</p></b>
<p>data <b>hello</b></p>
Nest properly.
HTML
.Order {{ color: red; }}
.Order {{ color: red; }}
Correct.
CSS
let val: number = 'test';
let val: string = 'test';
Fix type.
TypeScript
if (foo = 34) {{}}
if (foo === 34) {{}}
Use === for equality.
JavaScript
def process(): print('output')
def process(): print('output')
Indent function body.
Python
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
var x int
var x int
Correct.
Go
def bar puts 'result' end
def bar puts 'result' end
Correct.
Ruby
compute
compute()
Add parentheses.
Swift
DELETE FROM users WHERE name=14
DELETE FROM users WHERE name=14;
Add semicolon.
SQL
class = 'data'
class_name = 'data'
'class' is a keyword.
Python
bar
bar()
Add parentheses.
Kotlin
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
let mut data=68; let r1=&mut data; let ref2=&mut data;
let mut data=68; {{ let r1=&mut data; }} let ref2=&mut data;
Only one mutable borrow.
Rust
System.out.println('hello')
System.out.println('hello');
Add semicolon.
Java
div {{ color=#fff; }}
div {{ color: #fff; }}
Use colon.
CSS
my @arr = (87,19,52);
my @arr = (87,19,52);
Correct.
Perl
p {{ color: green }}
p {{ color: green; }}
Add semicolon.
CSS
SELECT COUNT(*) FROM users
SELECT COUNT(*) FROM users;
Missing semicolon.
SQL
age: world name: world,
age: world name: world
Remove comma.
YAML
if [ $result = 77 ]; then
if [ "$result" = 77 ]; then
Quote variable.
Shell
if (a = 24)
if (a == 24)
Use ==.
C++
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++