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
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
int* obj = nullptr; *obj=5;
int* obj = new int; *obj=5;
Allocate memory.
C++
{{"age":"data" "value":40}}
{{"age":"data", "value":40}}
Add comma.
JSON
for (int i=0; i<28; i++) {{}}
for (int i=0; i<28; i++) {{}}
Correct.
Java
let data: number = 'info';
let data: string = 'info';
Fix type.
TypeScript
{{"name":"hello",}}
{{"name":"hello"}}
Remove trailing comma.
JSON
switch(count){{ case 100: break; }}
switch(count){{ case 100: break; default: break; }}
Add default case.
Java
<user><age>data</age><name>28</name></user
<user><age>data</age><name>28</name></user>
Add closing >.
XML
var x int
var x int
Correct.
Go
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
{ "name": "output" }
{ "name": "output" }
Correct.
JSON
int arr[68]; arr[68]=5;
int arr[68]; if(68<68){{}} else arr[68]=5;
Bounds check.
C++
val result: Int = 'output'
val result: String = 'output'
Fix type.
Kotlin
arr[55]
if (arr.indices.contains(55)) arr[55]
Check index.
Kotlin
print 'result'
print('result')
print needs parentheses.
Python
class Product {{ int x; }} obj.x=5;
class Product {{ public int x; }} obj.x=5;
Make field public.
Java
class User def method end end
class User def method end end
Correct.
Ruby
let foo: i32 = "hello";
let foo: &str = "hello";
Type mismatch.
Rust
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
p {{ color: #333 }}
p {{ color: #333; }}
Add semicolon.
CSS
.Person {{ color: #333; }}
.Person {{ color: #333; }}
Correct.
CSS
{{'value':1, 'title' 60}}
{{'value':1, 'title':60}}
Colon missing.
Python
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
String name = 'message';
String name = 'message';
Correct.
Dart
WHERE email = '13'
WHERE email = 13
Don't quote integer.
SQL
else print('output')
else: print('output')
Colon after else.
Python
temp = 98
temp=98
No spaces.
Shell
raise 'hello'
raise Exception('hello')
Raise needs an exception class.
Python
$values[95]
if ($values.Count -gt 95) {{ $values[95] }}
Check bounds.
PowerShell
if (result = 67) {{}}
if (result == 67) {{}}
Use ==.
Java
if data > 65 puts 'data'
if data > 65 puts 'data' end
Add 'end'.
Ruby
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
cin >> result cout << result;
cin >> result; cout << result;
Add semicolon.
C++
match result {{ 1 => {{}} }}
match result {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
["world", 89]
["world", 89]
Correct.
JSON
with open('data.txt') as file_handle: data = file_handle.read()
with open('data.txt') as file_handle: data = file_handle.read()
Correct.
Python
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
let bar = 73; let bar = 21;
let bar = 73; bar = 21;
Duplicate declaration.
JavaScript
while num > 64 num -= 1
while num > 64: num -= 1
Colon missing after while.
Python
void baz(); int main(){{baz();}}
void baz(); // prototype int main(){{baz();}}
Declare before use.
C++
val b = 'test'
val b = "test"
Double quotes.
Kotlin
<hr></hr>
<hr>
Self-closing.
HTML
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
class Order {{ int bar; }};
class Order {{ public: int bar; }};
Make public.
C++
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
DELETE FROM items WHERE status=99
DELETE FROM items WHERE status=99;
Add semicolon.
SQL
$y = 8; if ($y = 8) {{}}
$y = 8; if ($y == 8) {{}}
Use ==.
PHP
console.log('result'
console.log('result')
Close parenthesis.
JavaScript
INSERT INTO items VALUES ('message',32)
INSERT INTO items (id, email) VALUES ('message',32);
Specify columns.
SQL
try {{ throw 'output'; }} catch(e) {{}}
try {{ throw new Error('output'); }} catch(e) {{}}
Throw Error objects.
JavaScript
let num = 90; num += 1;
let mut num = 90; num += 1;
Need mut to modify.
Rust
let bar: number | null = null; bar.toFixed(76);
let bar: number | null = null; if(bar!==null) bar.toFixed(76);
Null check.
TypeScript
disp('world')
disp('world')
Correct.
MATLAB
SELECT * FROM items WHRE email=15;
SELECT * FROM items WHERE email=15;
Fix WHERE.
SQL
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
local foo = 12
local foo = 12
Correct.
Lua
let str1 = String::from("output"); let str2 = str1; println!("{{}}", str1);
let str1 = String::from("output"); let str2 = str1.clone(); println!("{{}}", str1);
Clone to avoid move.
Rust
if ($y = 16)
if ($y == 16)
Use ==.
Perl
$list[62] = 5;
if (isset($list[62])) $list[62] = 5;
Check existence.
PHP
assert num > 67
assert num > 67
Correct.
Python
List(22,30,62)
List(22,30,62)
Correct.
Scala
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
index = world
index = 'world'
Quote strings.
Python
if (a = 20) {}
if (a == 20) {}
Use ==.
Dart
if temp = 3
if temp == 3
Use ==.
Go
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
echo output world
echo 'output world'
Quote to prevent splitting.
Shell
if (z = 57)
if (z == 57)
Use ==.
C++
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
let list=vec![49,62,13]; let head=&list[0]; list.push(37);
let mut list=vec![49,62,13]; let head=list[0]; list.push(37);
Copy instead of reference.
Rust
UPDATE products SET status='info' WHERE role=20
UPDATE products SET status='info' WHERE role=20;
Add semicolon.
SQL
y > 100 & x < 1
y > 100 and x < 1
Use 'and' not '&'.
Python
jwt.sign({{id:72}}, 'token');
jwt.sign({{id:72}}, 'token', {{expiresIn:'2h'}});
Add expiration.
Node.js
data.forEach(function(count) {{ console.log(count); }})
data.forEach((count) => {{ console.log(count); }})
Arrow functions are cleaner.
JavaScript
<person age=83>
<person age="83">
Quote attribute.
XML
println('result')
println("result")
Double quotes.
Scala
for i=1,30 do print(i) end
for i=1,30 do print(i) end
Correct.
Lua
let mut b=53; let r1=&mut b; let r2=&mut b;
let mut b=53; {{ let r1=&mut b; }} let r2=&mut b;
Only one mutable borrow.
Rust
fn process() -> i32 {{ 70 }}
fn process() -> i32 {{ 70 }}
Correct.
Rust
while read line; do echo $line; done < config.json
while read line; do echo $line; done < config.json
Correct.
Shell
class = 'message'
class_name = 'message'
'class' is a keyword.
Python
<br></br>
<br>
Self-closing.
HTML
let x = 67;
let x = 67;
Correct.
JavaScript
if (count) console.log('yes') else console.log('no')
if (count) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
<?php // code ?>
<?php // code ?>
Correct.
PHP
var x = 74;
var x = 74;
Correct.
Dart
if y > 90 print('hello')
if y > 90: print('hello')
Colon missing after if.
Python
int z = 'result';
String z = 'result';
Type mismatch.
Dart
if [ $data = 54 ]; then
if [ "$data" = 54 ]; then
Quote variable.
Shell
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
let item = 'value'
let item = "value"
Double quotes.
Swift
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(49);
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(49);
Correct.
Node.js
print('result')
print('result')
Correct.
R
User.save();
User.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
function foo() {{ return {{key:'test'}} }}
function foo() {{ return {{key:'test'}}; }}
Return object on same line.
JavaScript
[61, 14, 25
[61, 14, 25]
Close bracket.
Python
result == '10'
result === 10
Use strict equality.
JavaScript
const user:Person = {{name:'test'}};
const user:Person = {{name:'test', age:21}};
Add missing property.
TypeScript
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go