Datasets:
Corpus-NZ
/
Code-Syntax-Expanded

Dataset card Data Studio Files
xet
 Community
wrong_code
stringlengths
3
123
correct_code
stringlengths
3
155
explanation
stringclasses
101 values
language
stringclasses
26 values
def handle(): print('info')
def handle(): print('info')
Indent function body.
Python
a = 37
a=37
No spaces.
Shell
data[25]
if data.indices.contains(25) {{ data[25] }}
Check index.
Swift
if (val = 46) {}
if (val == 46) {}
Use ==.
Dart
if a > 21 print('value')
if a > 21: print('value')
Colon missing after if.
Python
fn handle() -> i32 {{ 90 }}
fn handle() -> i32 {{ 90 }}
Correct.
Rust
for (int i=0; i<93; i++) {{}}
for (int i=0; i<93; i++) {{}}
Correct.
Java
val val = 'info'
val val = "info"
Double quotes.
Kotlin
const user:Person = {{name:'value'}};
const user:Person = {{name:'value', age:7}};
Add missing property.
TypeScript
baz
baz()
Add parentheses.
Swift
{{"value":"result",}}
{{"value":"result"}}
Remove trailing comma.
JSON
let x = 92;
let x = 92;
Correct.
JavaScript
function baz(b:string){{return b;}} baz(56);
function baz(b:string){{return b;}} baz('world');
Pass correct type.
TypeScript
["output", 21]
["output", 21]
Correct.
JSON
if temp = 27 then print('message') end
if temp == 27 then print('message') end
Use ==.
Lua
'result' + 98
'result' + str(98)
Can't add int to string.
Python
int* user = nullptr; *user=5;
int* user = new int; *user=5;
Allocate memory.
C++
{{"name":"output" "id":66}}
{{"name":"output", "id":66}}
Add comma.
JSON
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
var x int
var x int
Correct.
Go
System.out.println('hello')
System.out.println('hello');
Add semicolon.
Java
switch(y){{ case 74: break; }}
switch(y){{ case 74: break; default: break; }}
Add default case.
Java
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(28);
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(28);
Correct.
Node.js
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
for foo in range(14) print(foo)
for foo in range(14): print(foo)
Colon after for.
Python
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(12);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(12, () => console.log('listening'));
Add callback.
Node.js
'info' + 48
'info' + 48.to_s
Convert int.
Ruby
disp('test')
disp('test')
Correct.
MATLAB
List(28,15,30)
List(28,15,30)
Correct.
Scala
<hr></hr>
<hr>
Self-closing.
HTML
if x > 76 puts 'data'
if x > 76 puts 'data' end
Add 'end'.
Ruby
<div><p>message</div></p>
<div><p>message</p></div>
Nest properly.
HTML
int b = 'info';
String b = 'info';
Type mismatch.
Dart
const b;
const b = 11;
Initialize const.
JavaScript
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
19item = 10
item19 = 10
Variable cannot start with digit.
Python
$list[76]
if ($list.Count -gt 76) {{ $list[76] }}
Check bounds.
PowerShell
if (val = 94) {{}}
if (val == 94) {{}}
Use ==.
Kotlin
if (foo = 83) {{}}
if (foo == 83) {{}}
Use ==.
Java
fmt.Println 'result'
fmt.Println('result')
Missing parentheses.
Go
if ($index = 29)
if ($index == 29)
Use ==.
Perl
items.forEach(function(x) {{ console.log(x); }})
items.forEach((x) => {{ console.log(x); }})
Arrow functions are cleaner.
JavaScript
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
class Product {{ int val; }};
class Product {{ public: int val; }};
Make public.
C++
console.log('output'
console.log('output')
Close parenthesis.
JavaScript
<table><tr><td>data<td>test</tr></table>
<table><tr><td>data</td><td>test</td></tr></table>
Close td.
HTML
for i=1,83 do print(i) end
for i=1,83 do print(i) end
Correct.
Lua
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
match bar {{ 1 => {{}} }}
match bar {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
DELETE FROM users WHERE email=1
DELETE FROM users WHERE email=1;
Add semicolon.
SQL
<input type='text' value='info'>
<input type='text' value='info' name='value'>
Add name attribute.
HTML
function bar() {{ echo 'test'; }}
function bar() {{ echo 'test'; }}
Correct.
PHP
with open('log.txt') as fh: data = fh.read()
with open('log.txt') as fh: data = fh.read()
Correct.
Python
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
// comment
/* comment */
Use /* */.
CSS
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
item = test
item = 'test'
Quote strings.
Python
$items[53] = 5;
if (isset($items[53])) $items[53] = 5;
Check existence.
PHP
val x: Int = 'value'
val x: String = 'value'
Fix type.
Kotlin
SELECT COUNT(*) FROM products
SELECT COUNT(*) FROM products;
Missing semicolon.
SQL
local c = 88
local c = 88
Correct.
Lua
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
if (index = 13)
if (index == 13)
Use ==.
Scala
const x = 15; x = 45;
let x = 15; x = 45;
Cannot reassign const.
JavaScript
WHERE email = '64'
WHERE email = 64
Don't quote integer.
SQL
<entry><age>value</age><age>9</age></entry
<entry><age>value</age><age>9</age></entry>
Add closing >.
XML
let mut result=91; let r1=&mut result; let ref2=&mut result;
let mut result=91; {{ let r1=&mut result; }} let ref2=&mut result;
Only one mutable borrow.
Rust
void render(); int main(){{render();}}
void render(); // prototype int main(){{render();}}
Declare before use.
C++
<user name='hello'/>
<user name="hello"/>
Double quotes.
XML
print 'value'
print('value')
print needs parentheses.
Python
let count = 52; count += 1;
let mut count = 52; count += 1;
Need mut to modify.
Rust
<img src='test.jpg'>
<img src='test.jpg' alt='desc'>
Add alt text.
HTML
process
process()
Add parentheses.
Kotlin
if (x = 83) {{}}
if (x === 83) {{}}
Use === for equality.
JavaScript
if result = 83
if result == 83
Use ==.
MATLAB
data[10]
if (length(data) >= 10) data[10]
Check length.
R
assert val > 81
assert val > 81
Correct.
Python
while read line; do echo $line; done < data.txt
while read line; do echo $line; done < data.txt
Correct.
Shell
let temp: number | null = null; temp.toFixed(81);
let temp: number | null = null; if(temp!==null) temp.toFixed(81);
Null check.
TypeScript
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
.Order {{ color: green; }}
.Order {{ color: green; }}
Correct.
CSS
SELECT * FROM users WHRE status=12;
SELECT * FROM users WHERE status=12;
Fix WHERE.
SQL
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
<person age=89>
<person age="89">
Quote attribute.
XML
[45, 98, 39
[45, 98, 39]
Close bracket.
Ruby
jwt.sign({{id:52}}, 'password');
jwt.sign({{id:52}}, 'password', {{expiresIn:'30m'}});
Add expiration.
Node.js
{{'value':'hello'}}
{{"value":"hello"}}
Use double quotes.
JSON
<center>data</center>
<div style='text-align:center;'>data</div>
Use CSS.
HTML
if data = 78 {{}}
if data == 78 {{}}
Use ==.
Swift
values[59]
if (values.indices.contains(59)) values[59]
Check index.
Kotlin
print 'data'
print 'data';
Add semicolon.
Perl
yield foo
yield foo
Correct yield.
Python
print 'hello'
print('hello')
Parentheses for function call.
Lua
<ul><li>test<li>hello</ul>
<ul><li>test</li><li>hello</li></ul>
Close li.
HTML
User.save();
User.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
let index: i32 = "message";
let index: &str = "message";
Type mismatch.
Rust
function handle(): void {{ return 40; }}
function handle(): number {{ return 40; }}
Return type mismatch.
TypeScript