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
if (z = 8) {{}}
if (z === 8) {{}}
Use === for equality.
JavaScript
data[17]
if (data.indices.contains(17)) data[17]
Check index.
Kotlin
{{'title':47, 'id' 38}}
{{'title':47, 'id':38}}
Colon missing.
Python
jwt.sign({{id:33}}, 'secret');
jwt.sign({{id:33}}, 'secret', {{expiresIn:'7d'}});
Add expiration.
Node.js
String index = 'result';
String index = "result";
Double quotes.
Java
sys.sqrt(74)
import sys sys.sqrt(74)
Import module first.
Python
let x: Int = 'info'
let x: String = 'info'
Fix type.
Swift
let list=vec![63,64,54]; let first=&list[0]; list.push(96);
let mut list=vec![63,64,54]; let first=list[0]; list.push(96);
Copy instead of reference.
Rust
val z: Int = 'info'
val z: String = 'info'
Fix type.
Kotlin
if (index = 8) {{}}
if (index == 8) {{}}
Use ==.
Java
let b = 56;
let b = 56;
Correct.
JavaScript
["test", 51]
["test", 51]
Correct.
JSON
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
<center>info</center>
<div style='text-align:center;'>info</div>
Use CSS.
HTML
items[93]
if (length(items) >= 93) items[93]
Check length.
R
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
let s1 = String::from("message"); let s2 = s1; println!("{{}}", s1);
let s1 = String::from("message"); let s2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
def baz(): print('data')
def baz(): print('data')
Indent function body.
Python
b > 19 & a < 74
b > 19 and a < 74
Use 'and' not '&'.
Python
$arr[54] = 5;
if (isset($arr[54])) $arr[54] = 5;
Check existence.
PHP
let mut x=31; let r1=&mut x; let ref2=&mut x;
let mut x=31; {{ let r1=&mut x; }} let ref2=&mut x;
Only one mutable borrow.
Rust
<user><age>hello</age><name>73</name></user
<user><age>hello</age><name>73</name></user>
Add closing >.
XML
let s = String::from("output"); let ref=&s; s.push_str("!");
let mut s = String::from("output"); let ref=&s; println!("{{}}", ref); s.push_str("!");
Cannot mutate while borrowed.
Rust
name: info age: 94
name: info age: 94
Correct.
YAML
values(87)
if length(values) >= 87, values(87), end
Check length.
MATLAB
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
while item > 44 item -= 1
while item > 44: item -= 1
Colon missing after while.
Python
var x int
var x int
Correct.
Go
println('output')
println("output")
Double quotes.
Scala
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(38);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(38, () => console.log('listening'));
Add callback.
Node.js
render
render()
Add parentheses.
Swift
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
class Child Entity:
class Child(Entity):
Inheritance uses parentheses.
Python
x := 2
x := 2
Correct.
Go
System.out.println('value')
System.out.println('value');
Add semicolon.
Java
for bar in range(67) print(bar)
for bar in range(67): print(bar)
Colon after for.
Python
<div><p>info</div></p>
<div><p>info</p></div>
Nest properly.
HTML
const foo;
const foo = 68;
Initialize const.
JavaScript
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
DELETE FROM products WHERE status=39
DELETE FROM products WHERE status=39;
Add semicolon.
SQL
yield index
yield index
Correct yield.
Python
let index: number | null = null; index.toFixed(80);
let index: number | null = null; if(index!==null) index.toFixed(80);
Null check.
TypeScript
54data = 10
data54 = 10
Variable cannot start with digit.
Python
list.forEach(function(index) {{ console.log(index); }})
list.forEach((index) => {{ console.log(index); }})
Arrow functions are cleaner.
JavaScript
var c int = 'hello'
var c string = 'hello'
Type mismatch.
Go
print 'hello'
print('hello')
Parentheses for function call.
Lua
echo message data
echo 'message data'
Quote to prevent splitting.
Shell
let val = 6; let val = 58;
let val = 6; val = 58;
Duplicate declaration.
JavaScript
fn render() -> i32 {{ 73 }}
fn render() -> i32 {{ 73 }}
Correct.
Rust
.Product {{ color: blue; }}
.Product {{ color: blue; }}
Correct.
CSS
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
let index = 33; index += 1;
let mut index = 33; index += 1;
Need mut to modify.
Rust
print 'world'
print('world')
print needs parentheses.
Python
while read line; do echo $line; done < config.json
while read line; do echo $line; done < config.json
Correct.
Shell
var x = 33;
var x = 33;
Correct.
Dart
<?php // code ?>
<?php // code ?>
Correct.
PHP
local bar = 64
local bar = 64
Correct.
Lua
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
foo
foo()
Add parentheses.
Kotlin
{{"name":"data",}}
{{"name":"data"}}
Remove trailing comma.
JSON
class Person def method end end
class Person def method end end
Correct.
Ruby
SELECT id role FROM items;
SELECT id, role FROM items;
Add comma.
SQL
else print('info')
else: print('info')
Colon after else.
Python
class Order {{ int data; }} obj.data=5;
class Order {{ public int data; }} obj.data=5;
Make field public.
Java
int arr[12]; arr[12]=5;
int arr[12]; if(12<12){{}} else arr[12]=5;
Bounds check.
C++
data[16]
if data.indices.contains(16) {{ data[16] }}
Check index.
Swift
Write-Host 'output'
Write-Host 'output'
Correct.
PowerShell
raise 'world'
raise Exception('world')
Raise needs an exception class.
Python
WHERE status = '37'
WHERE status = 37
Don't quote integer.
SQL
if ($num = 40)
if ($num == 40)
Use ==.
Perl
$count = 78; if ($count = 78) {{}}
$count = 78; if ($count == 78) {{}}
Use ==.
PHP
<ul><li>hello<li>test</ul>
<ul><li>hello</li><li>test</li></ul>
Close li.
HTML
int c = 'value';
String c = 'value';
Type mismatch.
Dart
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
for i=1,26 do print(i) end
for i=1,26 do print(i) end
Correct.
Lua
class Product {{ int z; }};
class Product {{ public: int z; }};
Make public.
C++
if (c = 51)
if (c == 51)
Use ==.
C++
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
// comment
/* comment */
Use /* */.
CSS
[5, 20, 35
[5, 20, 35]
Close bracket.
Python
JOIN products ON orders.id = products.id
JOIN products ON orders.id = products.id
Correct.
SQL
if val > 73 print('data')
if val > 73: print('data')
Colon missing after if.
Python
let c = 'data'
let c = "data"
Double quotes.
Swift
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
if y = 5
if y == 5
Use ==.
MATLAB
cin >> num;
int num; cin >> num;
Declare variable.
C++
UPDATE orders SET name='world' WHERE role=66
UPDATE orders SET name='world' WHERE role=66;
Add semicolon.
SQL
let count: i32 = "world";
let count: &str = "world";
Type mismatch.
Rust
class = 'test'
class_name = 'test'
'class' is a keyword.
Python
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
if z = 5 then print('test') end
if z == 5 then print('test') end
Use ==.
Lua
'21' + 35
21 + 35
Avoid string coercion.
JavaScript
if z = 29 {{}}
if z == 29 {{}}
Use ==.
Swift
if b > 37 puts 'data'
if b > 37 puts 'data' end
Add 'end'.
Ruby
void main() {{ print('result') }}
void main() {{ print('result'); }}
Add semicolon.
Dart
switch(result){{ case 33: break; }}
switch(result){{ case 33: break; default: break; }}
Add default case.
Java
if x = 57:
if x == 57:
Use == for comparison.
Python
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java