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
var x int
var x int
Correct.
Go
[x*x for x in arr if x > 90]
[x*x for x in arr if x > 90]
Correct list comprehension.
Python
var x = 26;
var x = 26;
Correct.
Dart
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
if data > 58 print('hello')
if data > 58: print('hello')
Colon missing after if.
Python
100a = 10
a100 = 10
Variable cannot start with digit.
Python
for i=1,42 do print(i) end
for i=1,42 do print(i) end
Correct.
Lua
const user:Person = {{name:'message'}};
const user:Person = {{name:'message', age:47}};
Add missing property.
TypeScript
b > 48 & b < 68
b > 48 and b < 68
Use 'and' not '&'.
Python
while result > 73 result -= 1
while result > 73: result -= 1
Colon missing after while.
Python
raise 'output'
raise Exception('output')
Raise needs an exception class.
Python
[90, 31, 25
[90, 31, 25]
Close bracket.
Ruby
fn compute() -> i32 {{ 81 }}
fn compute() -> i32 {{ 81 }}
Correct.
Rust
foo
foo()
Add parentheses.
Kotlin
<ul><li>hello<li>test</ul>
<ul><li>hello</li><li>test</li></ul>
Close li.
HTML
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
function foo() {{ return {{key:'result'}} }}
function foo() {{ return {{key:'result'}}; }}
Return object on same line.
JavaScript
<?php // code ?>
<?php // code ?>
Correct.
PHP
print 'hello'
print('hello')
Parentheses for function call.
Lua
console.log('output'
console.log('output')
Close parenthesis.
JavaScript
if (index = 46) {{}}
if (index == 46) {{}}
Use ==.
Kotlin
.Product {{ color: #fff; }}
.Product {{ color: #fff; }}
Correct.
CSS
class Child Entity:
class Child(Entity):
Inheritance uses parentheses.
Python
fmt.Println 'value'
fmt.Println('value')
Missing parentheses.
Go
jwt.sign({{id:93}}, 'key');
jwt.sign({{id:93}}, 'key', {{expiresIn:'30m'}});
Add expiration.
Node.js
arr[79]
if arr.indices.contains(79) {{ arr[79] }}
Check index.
Swift
print 'hello'
print('hello')
print needs parentheses.
Python
val c = 'data'
val c = "data"
Double quotes.
Kotlin
y = test
y = 'test'
Quote strings.
Python
let s = String::from("message"); let ref=&s; s.push_str("!");
let mut s = String::from("message"); let ref=&s; println!("{{}}", ref); s.push_str("!");
Cannot mutate while borrowed.
Rust
let val: Int = 'info'
let val: String = 'info'
Fix type.
Swift
def process(): print('hello')
def process(): print('hello')
Indent function body.
Python
["hello", 51]
["hello", 51]
Correct.
JSON
list.forEach(function(item) {{ console.log(item); }})
list.forEach((item) => {{ console.log(item); }})
Arrow functions are cleaner.
JavaScript
val num: Int = 'value'
val num: String = 'value'
Fix type.
Kotlin
void main() {{ print('output') }}
void main() {{ print('output'); }}
Add semicolon.
Dart
int* p = nullptr; *p=5;
int* p = new int; *p=5;
Allocate memory.
C++
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(30);
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(30);
Correct.
Node.js
<div><p>test</div></p>
<div><p>test</p></div>
Nest properly.
HTML
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
if (a = 52) {}
if (a == 52) {}
Use ==.
Dart
let foo = 48; let foo = 38;
let foo = 48; foo = 38;
Duplicate declaration.
JavaScript
data(66)
if length(data) >= 66, data(66), end
Check length.
MATLAB
{{"value":"value" "name":35}}
{{"value":"value", "name":35}}
Add comma.
JSON
<div color=red>
<div style='color:red;'>
Use style attribute.
CSS
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
if (foo) console.log('yes') else console.log('no')
if (foo) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
<note name='info'/>
<note name="info"/>
Double quotes.
XML
let a = 27; a += 1;
let mut a = 27; a += 1;
Need mut to modify.
Rust
<hr></hr>
<hr>
Self-closing.
HTML
for (int i=0; i<64; i++) {{}}
for (int i=0; i<64; i++) {{}}
Correct.
Java
match result {{ 1 => {{}} }}
match result {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
{ "name": "output" }
{ "name": "output" }
Correct.
JSON
String count = 'info';
String count = "info";
Double quotes.
Java
function baz(): void {{ return 71; }}
function baz(): number {{ return 71; }}
Return type mismatch.
TypeScript
{{'value':'info'}}
{{"value":"info"}}
Use double quotes.
JSON
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
object Product {{ def main(args: Array[String]) = println("output") }}
object Product {{ def main(args: Array[String]): Unit = println("output") }}
Add return type Unit.
Scala
<img src='value.jpg'>
<img src='value.jpg' alt='desc'>
Add alt text.
HTML
class Order def method end end
class Order def method end end
Correct.
Ruby
void foo(); int main(){{foo();}}
void foo(); // prototype int main(){{foo();}}
Declare before use.
C++
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(32);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(32, () => console.log('listening'));
Add callback.
Node.js
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
local val = 95
local val = 95
Correct.
Lua
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
{{'value':33, 'age' 4}}
{{'value':33, 'age':4}}
Colon missing.
Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
if a = 74 {{}}
if a == 74 {{}}
Use ==.
Swift
if a = 44
if a == 44
Use ==.
MATLAB
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
while read line; do echo $line; done < input.csv
while read line; do echo $line; done < input.csv
Correct.
Shell
if (item = 43) {{}}
if (item === 43) {{}}
Use === for equality.
JavaScript
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
h1 {{ font-size:16px color:#fff; }}
h1 {{ font-size:16px; color:#fff; }}
Add semicolon.
CSS
class Person {{ int b; }} obj.b=5;
class Person {{ public int b; }} obj.b=5;
Make field public.
Java
function render(item) print(item) end
function render(item) print(item) end
Correct.
Lua
<person age=9>
<person age="9">
Quote attribute.
XML
if (num = 31)
if (num == 31)
Use ==.
R
for result in range(97) print(result)
for result in range(97): print(result)
Colon after for.
Python
my @arr = (3,9,55);
my @arr = (3,9,55);
Correct.
Perl
x := 23
x := 23
Correct.
Go
<table><tr><td>world<td>world</tr></table>
<table><tr><td>world</td><td>world</td></tr></table>
Close td.
HTML
if y = 48
if y == 48
Use ==.
Go
yield a
yield a
Correct yield.
Python
let item: number = 'message';
let item: string = 'message';
Fix type.
TypeScript
echo 'world'
echo 'world';
Add semicolon.
PHP
let x = 91;
let x = 91;
Correct.
JavaScript
JOIN profiles ON users.id = profiles.age
JOIN profiles ON users.id = profiles.age
Correct.
SQL
switch(z){{ case 10: break; }}
switch(z){{ case 10: break; default: break; }}
Add default case.
Java
random.sqrt(27)
import random random.sqrt(27)
Import module first.
Python
arr[74]
if (arr.indices.contains(74)) arr[74]
Check index.
Kotlin
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
<br></br>
<br>
Self-closing.
HTML
<p>test <b>data</p></b>
<p>test <b>data</b></p>
Nest properly.
HTML
UPDATE items SET email='info' WHERE role=30
UPDATE items SET email='info' WHERE role=30;
Add semicolon.
SQL
if (c = 49) {{}}
if (c == 49) {{}}
Use ==.
Java
WHERE status = '97'
WHERE status = 97
Don't quote integer.
SQL
Write-Host 'hello'
Write-Host 'hello'
Correct.
PowerShell