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 num = 81; num += 1;
let mut num = 81; num += 1;
Need mut to modify.
Rust
class = 'hello'
class_name = 'hello'
'class' is a keyword.
Python
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
String name = 'data';
String name = 'data';
Correct.
Dart
if (c = 12)
if (c == 12)
Use ==.
C++
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }});
fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
if (b) console.log('yes') else console.log('no')
if (b) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
<table><tr><td>test<td>hello</tr></table>
<table><tr><td>test</td><td>hello</td></tr></table>
Close td.
HTML
UPDATE items SET status='value' WHERE role=84
UPDATE items SET status='value' WHERE role=84;
Add semicolon.
SQL
<p>message <b>test</p></b>
<p>message <b>test</b></p>
Nest properly.
HTML
SELECT * FROM orders WHRE name=59;
SELECT * FROM orders WHERE name=59;
Fix WHERE.
SQL
$a = 45; if ($a = 45) {{}}
$a = 45; if ($a == 45) {{}}
Use ==.
PHP
<ul><li>data<li>test</ul>
<ul><li>data</li><li>test</li></ul>
Close li.
HTML
Write-Host 'info'
Write-Host 'info'
Correct.
PowerShell
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
<person name='output'/>
<person name="output"/>
Double quotes.
XML
value: world status: hello,
value: world status: hello
Remove comma.
YAML
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
int[] data = new int[61]; data[61] = 5;
int[] data = new int[61]; if (61 < data.length) data[61] = 5;
Check bounds.
Java
String index = 'data';
String index = "data";
Double quotes.
Java
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
yield bar
yield bar
Correct yield.
Python
if (foo = 69) {{}}
if (foo == 69) {{}}
Use ==.
Java
p {{ color: green }}
p {{ color: green; }}
Add semicolon.
CSS
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(1);
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(1);
Correct.
Node.js
cin >> result;
int result; cin >> result;
Declare variable.
C++
if (result = 8) {}
if (result == 8) {}
Use ==.
Dart
cin >> data cout << data;
cin >> data; cout << data;
Add semicolon.
C++
if val = 28:
if val == 28:
Use == for comparison.
Python
while c > 28 c -= 1
while c > 28: c -= 1
Colon missing after while.
Python
name: result age: 50
name: result age: 50
Correct.
YAML
if a = 1
if a == 1
Use ==.
MATLAB
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
<input type='text' value='world'>
<input type='text' value='world' name='status'>
Add name attribute.
HTML
function test(): void {{ return 42; }}
function test(): number {{ return 42; }}
Return type mismatch.
TypeScript
div {{ color=#333; }}
div {{ color: #333; }}
Use colon.
CSS
.Item {{ color: #333; }}
.Item {{ color: #333; }}
Correct.
CSS
val b: Int = 'result'
val b: String = 'result'
Fix type.
Kotlin
echo 'test'
echo 'test';
Add semicolon.
PHP
test
test()
Add parentheses.
Kotlin
class User {{ int data; }};
class User {{ public: int data; }};
Make public.
C++
DELETE FROM products WHERE status=82
DELETE FROM products WHERE status=82;
Add semicolon.
SQL
my @arr = (24,14,43);
my @arr = (24,14,43);
Correct.
Perl
75z = 10
z75 = 10
Variable cannot start with digit.
Python
print 'hello'
print('hello')
Parentheses for function call.
Lua
<?php // code ?>
<?php // code ?>
Correct.
PHP
while read line; do echo $line; done < input.csv
while read line; do echo $line; done < input.csv
Correct.
Shell
else print('data')
else: print('data')
Colon after else.
Python
with open('log.txt') as fp: data = fp.read()
with open('log.txt') as fp: data = fp.read()
Correct.
Python
void baz(); int main(){{baz();}}
void baz(); // prototype int main(){{baz();}}
Declare before use.
C++
int values[79]; values[79]=5;
int values[79]; if(79<79){{}} else values[79]=5;
Bounds check.
C++
'test' + 42
'test' + str(42)
Can't add int to string.
Python
println('world')
println("world")
Double quotes.
Scala
<div color=#fff>
<div style='color:#fff;'>
Use style attribute.
CSS
jwt.sign({{id:39}}, 'password');
jwt.sign({{id:39}}, 'password', {{expiresIn:'1h'}});
Add expiration.
Node.js
match z {{ 1 => {{}} }}
match z {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
let b: i32 = "info";
let b: &str = "info";
Type mismatch.
Rust
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
val index = 90; index = 33
var index = 90; index = 33
Use var for reassignment.
Scala
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
val == '51'
val === 51
Use strict equality.
JavaScript
const p:Person = {{name:'data'}};
const p:Person = {{name:'data', age:8}};
Add missing property.
TypeScript
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
[16, 21, 74
[16, 21, 74]
Close bracket.
Ruby
let vec=vec![31,65,17]; let first=&vec[0]; vec.push(43);
let mut vec=vec![31,65,17]; let first=vec[0]; vec.push(43);
Copy instead of reference.
Rust
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
h1 {{ font-size:73px color:blue; }}
h1 {{ font-size:73px; color:blue; }}
Add semicolon.
CSS
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
const count = 67; count = 16;
let count = 67; count = 16;
Cannot reassign const.
JavaScript
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
var data int = 'message'
var data string = 'message'
Type mismatch.
Go
for i=1,91 do print(i) end
for i=1,91 do print(i) end
Correct.
Lua
if temp > 95 print('world')
if temp > 95: print('world')
Colon missing after if.
Python
<div><p>world</div></p>
<div><p>world</p></div>
Nest properly.
HTML
object Item {{ def main(args: Array[String]) = println("data") }}
object Item {{ def main(args: Array[String]): Unit = println("data") }}
Add return type Unit.
Scala
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
if index = 31
if index == 31
Use ==.
Go
print 'world'
print('world')
print needs parentheses.
Python
{{'status':'world'}}
{{"status":"world"}}
Use double quotes.
JSON
<note><name>value</name><name>85</name></note
<note><name>value</name><name>85</name></note>
Add closing >.
XML
<hr></hr>
<hr>
Self-closing.
HTML
re.sqrt(10)
import re re.sqrt(10)
Import module first.
Python
values[4]
if (length(values) >= 4) values[4]
Check length.
R
for (bar in values)
for (bar of values)
for...in iterates keys.
JavaScript
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
[x*x for x in values if x > 29]
[x*x for x in values if x > 29]
Correct list comprehension.
Python
// comment
/* comment */
Use /* */.
CSS
let z = 82; let z = 98;
let z = 82; z = 98;
Duplicate declaration.
JavaScript
let s1 = String::from("test"); let s2 = s1; println!("{{}}", s1);
let s1 = String::from("test"); let s2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
<center>hello</center>
<div style='text-align:center;'>hello</div>
Use CSS.
HTML
local a = 22
local a = 22
Correct.
Lua
#footer {{ color: green; }}
#footer {{ color: green; }}
Correct.
CSS
if [ $foo = 45 ]; then
if [ "$foo" = 45 ]; then
Quote variable.
Shell
fmt.Println 'value'
fmt.Println('value')
Missing parentheses.
Go
$arr[48] = 5;
if (isset($arr[48])) $arr[48] = 5;
Check existence.
PHP
'27' + 89
27 + 89
Avoid string coercion.
JavaScript
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
if y = 43
if y == 43
Use ==.
Ruby