Datasets:
Gugu8
/
Code-Syntax

Dataset card Data Studio Files
xet
 Community
wrong_code
stringlengths
3
123
correct_code
stringlengths
3
155
explanation
stringclasses
83 values
language
stringclasses
23 values
{{"id":"hello",}}
{{"id":"hello"}}
Remove trailing comma.
JSON
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
for (int i=0; i<88; i++) {{}}
for (int i=0; i<88; i++) {{}}
Correct.
Java
'info' + 94
'info' + str(94)
Can't add int to string.
Python
INSERT INTO items VALUES ('data',54)
INSERT INTO items (id, role) VALUES ('data',54);
Specify columns.
SQL
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
try {{ throw 'data'; }} catch(e) {{}}
try {{ throw new Error('data'); }} catch(e) {{}}
Throw Error objects.
JavaScript
if ($count = 84) {{}}
if ($count -eq 84) {{}}
Use -eq.
PowerShell
System.out.println('result')
System.out.println('result');
Add semicolon.
Java
c == '55'
c === 55
Use strict equality.
JavaScript
arr(11)
if length(arr) >= 11, arr(11), end
Check length.
MATLAB
<user name='world'/>
<user name="world"/>
Double quotes.
XML
<table><tr><td>hello<td>world</tr></table>
<table><tr><td>hello</td><td>world</td></tr></table>
Close td.
HTML
void bar(); int main(){{bar();}}
void bar(); // prototype int main(){{bar();}}
Declare before use.
C++
let foo: Int = 'hello'
let foo: String = 'hello'
Fix type.
Swift
match b {{ 1 => {{}} }}
match b {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
$val = 69; if ($val = 69) {{}}
$val = 69; if ($val == 69) {{}}
Use ==.
PHP
function compute() {{ echo 'value'; }}
function compute() {{ echo 'value'; }}
Correct.
PHP
if (val = 32) {{}}
if (val == 32) {{}}
Use ==.
Java
["result", 86]
["result", 86]
Correct.
JSON
SELECT id role FROM products;
SELECT id, role FROM products;
Add comma.
SQL
int values[25]; values[25]=5;
int values[25]; if(25<25){{}} else values[25]=5;
Bounds check.
C++
num = test
num = 'test'
Quote strings.
Python
z > 77 & x < 74
z > 77 and x < 74
Use 'and' not '&'.
Python
def compute(): print('world')
def compute(): print('world')
Indent function body.
Python
if [ $result = 94 ]; then
if [ "$result" = 94 ]; then
Quote variable.
Shell
Product.save();
Product.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
val num = 'test'
val num = "test"
Double quotes.
Kotlin
raise 'world'
raise Exception('world')
Raise needs an exception class.
Python
if (item = 38) {{}}
if (item == 38) {{}}
Use ==.
Kotlin
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
p {{ color: blue }}
p {{ color: blue; }}
Add semicolon.
CSS
fn bar() -> i32 {{ 20 }}
fn bar() -> i32 {{ 20 }}
Correct.
Rust
function render() {{ return {{key:'data'}} }}
function render() {{ return {{key:'data'}}; }}
Return object on same line.
JavaScript
if count = 49
if count == 49
Use ==.
Go
const p:Person = {{name:'message'}};
const p:Person = {{name:'message', age:31}};
Add missing property.
TypeScript
class = 'hello'
class_name = 'hello'
'class' is a keyword.
Python
else print('message')
else: print('message')
Colon after else.
Python
'test' + 60
'test' + 60.to_s
Convert int.
Ruby
var val int = 'data'
var val string = 'data'
Type mismatch.
Go
if count = 21:
if count == 21:
Use == for comparison.
Python
def foo puts 'hello' end
def foo puts 'hello' end
Correct.
Ruby
<div><p>value</div></p>
<div><p>value</p></div>
Nest properly.
HTML
WHERE id = '76'
WHERE id = 76
Don't quote integer.
SQL
data[3]
if (length(data) >= 3) data[3]
Check length.
R
{{'age':'value'}}
{{"age":"value"}}
Use double quotes.
JSON
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
function process(foo:string){{return foo;}} process(19);
function process(foo:string){{return foo;}} process('test');
Pass correct type.
TypeScript
cin >> item cout << item;
cin >> item; cout << item;
Add semicolon.
C++
div {{ color=green; }}
div {{ color: green; }}
Use colon.
CSS
let result: number | null = null; result.toFixed(93);
let result: number | null = null; if(result!==null) result.toFixed(93);
Null check.
TypeScript
<p>hello <b>hello</p></b>
<p>hello <b>hello</b></p>
Nest properly.
HTML
$arr[43]
if ($arr.Count -gt 43) {{ $arr[43] }}
Check bounds.
PowerShell
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
.Item {{ color: blue; }}
.Item {{ color: blue; }}
Correct.
CSS
if c = 65
if c == 65
Use ==.
Ruby
if foo > 78 puts 'result'
if foo > 78 puts 'result' end
Add 'end'.
Ruby
let count: i32 = "message";
let count: &str = "message";
Type mismatch.
Rust
for (a in values)
for (a of values)
for...in iterates keys.
JavaScript
if b = 12
if b == 12
Use ==.
MATLAB
'76' + 50
76 + 50
Avoid string coercion.
JavaScript
Write-Host 'value'
Write-Host 'value'
Correct.
PowerShell
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
if ($count = 79)
if ($count == 79)
Use ==.
Perl
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
print 'world'
print 'world';
Add semicolon.
Perl
if index > 8 print('result')
if index > 8: print('result')
Colon missing after if.
Python
items.forEach(function(result) {{ console.log(result); }})
items.forEach((result) => {{ console.log(result); }})
Arrow functions are cleaner.
JavaScript
assert a > 31
assert a > 31
Correct.
Python
const data;
const data = 83;
Initialize const.
JavaScript
let s1 = String::from("data"); let str2 = s1; println!("{{}}", s1);
let s1 = String::from("data"); let str2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
def compute(b): return b + 1
def compute(b): return b + 1
Correct.
Python
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(25);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(25, () => console.log('listening'));
Add callback.
Node.js
a = 87
a=87
No spaces.
Shell
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
class Child Entity:
class Child(Entity):
Inheritance uses parentheses.
Python
let z: number = 'info';
let z: string = 'info';
Fix type.
TypeScript
68result = 10
result68 = 10
Variable cannot start with digit.
Python
for count in range(63) print(count)
for count in range(63): print(count)
Colon after for.
Python
int* user = nullptr; *user=5;
int* user = new int; *user=5;
Allocate memory.
C++
disp('world')
disp('world')
Correct.
MATLAB
status: world value: world,
status: world value: world
Remove comma.
YAML
let a = 'world'
let a = "world"
Double quotes.
Swift
list[96]
if (list.indices.contains(96)) list[96]
Check index.
Kotlin
jwt.sign({{id:12}}, 'token');
jwt.sign({{id:12}}, 'token', {{expiresIn:'2h'}});
Add expiration.
Node.js
math.sqrt(9)
import math math.sqrt(9)
Import module first.
Python
if (bar = 44)
if (bar == 44)
Use ==.
C++
x := 52
x := 52
Correct.
Go
if count = 18 {{}}
if count == 18 {{}}
Use ==.
Swift
$values[12] = 5;
if (isset($values[12])) $values[12] = 5;
Check existence.
PHP
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
let mut x=67; let r1=&mut x; let r2=&mut x;
let mut x=67; {{ let r1=&mut x; }} let r2=&mut x;
Only one mutable borrow.
Rust
foo
foo()
Add parentheses.
Kotlin
<ul><li>hello<li>data</ul>
<ul><li>hello</li><li>data</li></ul>
Close li.
HTML
my @arr = (40,94,54);
my @arr = (40,94,54);
Correct.
Perl
echo data hello
echo 'data hello'
Quote to prevent splitting.
Shell
String y = 'data';
String y = "data";
Double quotes.
Java
fmt.Println 'output'
fmt.Println('output')
Missing parentheses.
Go
process
process()
Add parentheses.
Swift