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 text = String::from("world"); let borrow=&text; text.push_str("!");
let mut text = String::from("world"); let borrow=&text; println!("{{}}", borrow); text.push_str("!");
Cannot mutate while borrowed.
Rust
'world' + 4
'world' + 4.to_s
Convert int.
Ruby
fn bar() -> i32 {{ 36 }}
fn bar() -> i32 {{ 36 }}
Correct.
Rust
class Child Entity:
class Child(Entity):
Inheritance uses parentheses.
Python
var x int
var x int
Correct.
Go
println('message')
println("message")
Double quotes.
Scala
while foo > 68 foo -= 1
while foo > 68: foo -= 1
Colon missing after while.
Python
String b = 'test';
String b = "test";
Double quotes.
Java
items(48)
if length(items) >= 48, items(48), end
Check length.
MATLAB
DELETE FROM items WHERE id=81
DELETE FROM items WHERE id=81;
Add semicolon.
SQL
if (count = 71)
if (count == 71)
Use ==.
R
echo 'info'
echo 'info';
Add semicolon.
PHP
WHERE email = '37'
WHERE email = 37
Don't quote integer.
SQL
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
int[] items = new int[78]; items[78] = 5;
int[] items = new int[78]; if (78 < items.length) items[78] = 5;
Check bounds.
Java
fmt.Println 'world'
fmt.Println('world')
Missing parentheses.
Go
<div><p>hello</div></p>
<div><p>hello</p></div>
Nest properly.
HTML
if bar = 100:
if bar == 100:
Use == for comparison.
Python
const item;
const item = 82;
Initialize const.
JavaScript
num == '87'
num === 87
Use strict equality.
JavaScript
if ($num = 39) {{}}
if ($num -eq 39) {{}}
Use -eq.
PowerShell
def handle(): print('test')
def handle(): print('test')
Indent function body.
Python
val y: Int = 'data'
val y: String = 'data'
Fix type.
Kotlin
let val: number | null = null; val.toFixed(14);
let val: number | null = null; if(val!==null) val.toFixed(14);
Null check.
TypeScript
const b = 56; b = 43;
let b = 56; b = 43;
Cannot reassign const.
JavaScript
{{'value':'data'}}
{{"value":"data"}}
Use double quotes.
JSON
values[43]
if values.indices.contains(43) {{ values[43] }}
Check index.
Swift
if (y = 75)
if (y == 75)
Use ==.
Scala
var x = 35;
var x = 35;
Correct.
Dart
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
{{"id":"hello",}}
{{"id":"hello"}}
Remove trailing comma.
JSON
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(4);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(4, () => console.log('listening'));
Add callback.
Node.js
def render(bar): return bar + 1
def render(bar): return bar + 1
Correct.
Python
h1 {{ font-size:86px color:#fff; }}
h1 {{ font-size:86px; color:#fff; }}
Add semicolon.
CSS
if ($x = 47)
if ($x == 47)
Use ==.
Perl
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(31);
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(31);
Correct.
Node.js
<hr></hr>
<hr>
Self-closing.
HTML
item = hello
item = 'hello'
Quote strings.
Python
else print('test')
else: print('test')
Colon after else.
Python
items.forEach(function(index) {{ console.log(index); }})
items.forEach((index) => {{ console.log(index); }})
Arrow functions are cleaner.
JavaScript
List(91,64,6)
List(91,64,6)
Correct.
Scala
if data = 59
if data == 59
Use ==.
Go
let data = 'test'
let data = "test"
Double quotes.
Swift
if [ $x = 52 ]; then
if [ "$x" = 52 ]; then
Quote variable.
Shell
if x = 51
if x == 51
Use ==.
MATLAB
try {{ throw 'test'; }} catch(e) {{}}
try {{ throw new Error('test'); }} catch(e) {{}}
Throw Error objects.
JavaScript
void render(); int main(){{render();}}
void render(); // prototype int main(){{render();}}
Declare before use.
C++
if (result = 67)
if (result == 67)
Use ==.
C++
int c = 'world';
String c = 'world';
Type mismatch.
Dart
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
with open('log.txt') as file_handle: data = file_handle.read()
with open('log.txt') as file_handle: data = file_handle.read()
Correct.
Python
class = 'message'
class_name = 'message'
'class' is a keyword.
Python
cin >> a cout << a;
cin >> a; cout << a;
Add semicolon.
C++
if (result = 91) {}
if (result == 91) {}
Use ==.
Dart
// comment
/* comment */
Use /* */.
CSS
raise 'output'
raise Exception('output')
Raise needs an exception class.
Python
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
my @arr = (8,16,57);
my @arr = (8,16,57);
Correct.
Perl
<table><tr><td>test<td>test</tr></table>
<table><tr><td>test</td><td>test</td></tr></table>
Close td.
HTML
[80, 30, 96
[80, 30, 96]
Close bracket.
Ruby
int list[89]; list[89]=5;
int list[89]; if(89<89){{}} else list[89]=5;
Bounds check.
C++
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
print('data')
print('data')
Correct.
R
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
print 'message'
print('message')
print needs parentheses.
Python
String name = 'world';
String name = 'world';
Correct.
Dart
let x = 38; x += 1;
let mut x = 38; x += 1;
Need mut to modify.
Rust
System.out.println('world')
System.out.println('world');
Add semicolon.
Java
<person age=86>
<person age="86">
Quote attribute.
XML
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
jwt.sign({{id:16}}, 'token');
jwt.sign({{id:16}}, 'token', {{expiresIn:'15m'}});
Add expiration.
Node.js
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
if (c = 53) {{}}
if (c == 53) {{}}
Use ==.
Kotlin
switch(a){{ case 47: break; }}
switch(a){{ case 47: break; default: break; }}
Add default case.
Java
let list=vec![52,91,45]; let primary=&list[0]; list.push(96);
let mut list=vec![52,91,45]; let primary=list[0]; list.push(96);
Copy instead of reference.
Rust
for (item in arr)
for (item of arr)
for...in iterates keys.
JavaScript
{{'id':97, 'age' 86}}
{{'id':97, 'age':86}}
Colon missing.
Python
let str1 = String::from("hello"); let text2 = str1; println!("{{}}", str1);
let str1 = String::from("hello"); let text2 = str1.clone(); println!("{{}}", str1);
Clone to avoid move.
Rust
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
'world' + 84
'world' + str(84)
Can't add int to string.
Python
title: output value: data,
title: output value: data
Remove comma.
YAML
for (int i=0; i<92; i++) {{}}
for (int i=0; i<92; i++) {{}}
Correct.
Java
UPDATE orders SET age='test' WHERE role=65
UPDATE orders SET age='test' WHERE role=65;
Add semicolon.
SQL
$list[68]
if ($list.Count -gt 68) {{ $list[68] }}
Check bounds.
PowerShell
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
yield x
yield x
Correct yield.
Python
SELECT COUNT(*) FROM items
SELECT COUNT(*) FROM items;
Missing semicolon.
SQL
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
print 'info'
print 'info';
Add semicolon.
Perl
{ "name": "message" }
{ "name": "message" }
Correct.
JSON
SELECT * FROM orders WHRE id=9;
SELECT * FROM orders WHERE id=9;
Fix WHERE.
SQL
62temp = 10
temp62 = 10
Variable cannot start with digit.
Python
'20' + 15
20 + 15
Avoid string coercion.
JavaScript
let temp = 15; let temp = 8;
let temp = 15; temp = 8;
Duplicate declaration.
JavaScript
[23, 49, 95
[23, 49, 95]
Close bracket.
Python
random.sqrt(20)
import random random.sqrt(20)
Import module first.
Python
JOIN orders ON products.id = orders.name
JOIN orders ON products.id = orders.name
Correct.
SQL
{{"status":"world" "age":1}}
{{"status":"world", "age":1}}
Add comma.
JSON
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB