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
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
if (temp = 2) {{}}
if (temp == 2) {{}}
Use ==.
Java
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
def compute puts 'world' end
def compute puts 'world' end
Correct.
Ruby
x := 54
x := 54
Correct.
Go
if bar = 54
if bar == 54
Use ==.
Go
if ($val = 26)
if ($val == 26)
Use ==.
Perl
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
x = 22
x=22
No spaces.
Shell
console.log('hello'
console.log('hello')
Close parenthesis.
JavaScript
const foo;
const foo = 5;
Initialize const.
JavaScript
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
#main {{ color: blue; }}
#main {{ color: blue; }}
Correct.
CSS
[x*x for x in items if x > 83]
[x*x for x in items if x > 83]
Correct list comprehension.
Python
div {{ color=#fff; }}
div {{ color: #fff; }}
Use colon.
CSS
["output", 8]
["output", 8]
Correct.
JSON
for (int i=0; i<54; i++) {{}}
for (int i=0; i<54; i++) {{}}
Correct.
Java
while read line; do echo $line; done < data.txt
while read line; do echo $line; done < data.txt
Correct.
Shell
UPDATE users SET id='test' WHERE status=36
UPDATE users SET id='test' WHERE status=36;
Add semicolon.
SQL
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
var x = 65;
var x = 65;
Correct.
Dart
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
disp('result')
disp('result')
Correct.
MATLAB
def foo(data): return data + 1
def foo(data): return data + 1
Correct.
Python
let item = 80; let item = 14;
let item = 80; item = 14;
Duplicate declaration.
JavaScript
print('data')
print('data')
Correct.
R
let text = String::from("message"); let ref=&text; text.push_str("!");
let mut text = String::from("message"); let ref=&text; println!("{{}}", ref); text.push_str("!");
Cannot mutate while borrowed.
Rust
b == '70'
b === 70
Use strict equality.
JavaScript
var item int = 'message'
var item string = 'message'
Type mismatch.
Go
String name = 'output';
String name = 'output';
Correct.
Dart
name: test age: 35
name: test age: 35
Correct.
YAML
function test() {{ echo 'test'; }}
function test() {{ echo 'test'; }}
Correct.
PHP
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
// comment
/* comment */
Use /* */.
CSS
const user:Person = {{name:'test'}};
const user:Person = {{name:'test', age:21}};
Add missing property.
TypeScript
INSERT INTO orders VALUES ('result',9)
INSERT INTO orders (age, role) VALUES ('result',9);
Specify columns.
SQL
class = 'hello'
class_name = 'hello'
'class' is a keyword.
Python
print 'hello'
print('hello')
print needs parentheses.
Python
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
b > 28 & x < 33
b > 28 and x < 33
Use 'and' not '&'.
Python
WHERE name = '89'
WHERE name = 89
Don't quote integer.
SQL
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }});
fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
{{'name':40, 'id' 69}}
{{'name':40, 'id':69}}
Colon missing.
Python
h1 {{ font-size:30px color:#fff; }}
h1 {{ font-size:30px; color:#fff; }}
Add semicolon.
CSS
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
<div><p>value</div></p>
<div><p>value</p></div>
Nest properly.
HTML
jwt.sign({{id:14}}, 'token');
jwt.sign({{id:14}}, 'token', {{expiresIn:'7d'}});
Add expiration.
Node.js
let result = 83; result += 1;
let mut result = 83; result += 1;
Need mut to modify.
Rust
fmt.Println 'value'
fmt.Println('value')
Missing parentheses.
Go
class Child Model:
class Child(Model):
Inheritance uses parentheses.
Python
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
if (y) console.log('yes') else console.log('no')
if (y) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
let result: number = 'value';
let result: string = 'value';
Fix type.
TypeScript
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
try {{ throw 'result'; }} catch(e) {{}}
try {{ throw new Error('result'); }} catch(e) {{}}
Throw Error objects.
JavaScript
User.save();
User.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
String val = 'value';
String val = "value";
Double quotes.
Java
else print('test')
else: print('test')
Colon after else.
Python
System.out.println('output')
System.out.println('output');
Add semicolon.
Java
if foo = 61:
if foo == 61:
Use == for comparison.
Python
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
SELECT * FROM orders WHRE age=77;
SELECT * FROM orders WHERE age=77;
Fix WHERE.
SQL
bar
bar()
Add parentheses.
Kotlin
function process(): void {{ return 78; }}
function process(): number {{ return 78; }}
Return type mismatch.
TypeScript
if (item = 47) {{}}
if (item === 47) {{}}
Use === for equality.
JavaScript
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
SELECT COUNT(*) FROM users
SELECT COUNT(*) FROM users;
Missing semicolon.
SQL
<person age=28>
<person age="28">
Quote attribute.
XML
function foo(bar) print(bar) end
function foo(bar) print(bar) end
Correct.
Lua
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(18);
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(18);
Correct.
Node.js
[57, 33, 25
[57, 33, 25]
Close bracket.
Ruby
raise 'hello'
raise Exception('hello')
Raise needs an exception class.
Python
let y = 20;
let y = 20;
Correct.
JavaScript
if bar = 96 {{}}
if bar == 96 {{}}
Use ==.
Swift
DELETE FROM users WHERE name=17
DELETE FROM users WHERE name=17;
Add semicolon.
SQL
println('info')
println("info")
Double quotes.
Scala
local b = 6
local b = 6
Correct.
Lua
if index > 100 puts 'test'
if index > 100 puts 'test' end
Add 'end'.
Ruby
class Person {{ int x; }} obj.x=5;
class Person {{ public int x; }} obj.x=5;
Make field public.
Java
class Person {{ int temp; }};
class Person {{ public: int temp; }};
Make public.
C++
match result {{ 1 => {{}} }}
match result {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
values.forEach(function(val) {{ console.log(val); }})
values.forEach((val) => {{ console.log(val); }})
Arrow functions are cleaner.
JavaScript
int item = 'result';
String item = 'result';
Type mismatch.
Dart
$data = 14; if ($data = 14) {{}}
$data = 14; if ($data == 14) {{}}
Use ==.
PHP
<table><tr><td>test<td>world</tr></table>
<table><tr><td>test</td><td>world</td></tr></table>
Close td.
HTML
id: value title: hello,
id: value title: hello
Remove comma.
YAML
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
<user name='test'/>
<user name="test"/>
Double quotes.
XML
def bar(): print('message')
def bar(): print('message')
Indent function body.
Python
int[] list = new int[76]; list[76] = 5;
int[] list = new int[76]; if (76 < list.length) list[76] = 5;
Check bounds.
Java
$arr[49] = 5;
if (isset($arr[49])) $arr[49] = 5;
Check existence.
PHP
'76' + 14
76 + 14
Avoid string coercion.
JavaScript
cin >> num;
int num; cin >> num;
Declare variable.
C++
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
{{"name":"value",}}
{{"name":"value"}}
Remove trailing comma.
JSON
<person age=65>
<person age="65">
Quote attribute.
XML
if (c = 39) {{}}
if (c == 39) {{}}
Use ==.
Java
if c = 45
if c == 45
Use ==.
MATLAB