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
class Order {{ int temp; }};
class Order {{ public: int temp; }};
Make public.
C++
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
const index;
const index = 96;
Initialize const.
JavaScript
cin >> num;
int num; cin >> num;
Declare variable.
C++
baz
baz()
Add parentheses.
Swift
my @arr = (60,5,87);
my @arr = (60,5,87);
Correct.
Perl
WHERE age = '91'
WHERE age = 91
Don't quote integer.
SQL
if ($num = 82)
if ($num == 82)
Use ==.
Perl
print 'world'
print 'world';
Add semicolon.
Perl
function baz(): void {{ return 76; }}
function baz(): number {{ return 76; }}
Return type mismatch.
TypeScript
data(84)
if length(data) >= 84, data(84), end
Check length.
MATLAB
<center>data</center>
<div style='text-align:center;'>data</div>
Use CSS.
HTML
with open('config.json') as fp: data = fp.read()
with open('config.json') as fp: data = fp.read()
Correct.
Python
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
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(60);
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(60);
Correct.
Node.js
yield data
yield data
Correct yield.
Python
foo
foo()
Add parentheses.
Kotlin
arr[36]
if arr.indices.contains(36) {{ arr[36] }}
Check index.
Swift
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
<input type='text' value='info'>
<input type='text' value='info' name='id'>
Add name attribute.
HTML
val temp: Int = 'value'
val temp: String = 'value'
Fix type.
Kotlin
for i=1,74 do print(i) end
for i=1,74 do print(i) end
Correct.
Lua
DELETE FROM products WHERE email=99
DELETE FROM products WHERE email=99;
Add semicolon.
SQL
result = hello
result = 'hello'
Quote strings.
Python
match bar {{ 1 => {{}} }}
match bar {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
if (z = 40)
if (z == 40)
Use ==.
C++
if (y = 35)
if (y == 35)
Use ==.
R
if (data = 74) {{}}
if (data === 74) {{}}
Use === for equality.
JavaScript
console.log('message'
console.log('message')
Close parenthesis.
JavaScript
let a = 7; a += 1;
let mut a = 7; a += 1;
Need mut to modify.
Rust
var z int = 'data'
var z string = 'data'
Type mismatch.
Go
local result = 55
local result = 55
Correct.
Lua
<note><age>data</age><age>5</age></note
<note><age>data</age><age>5</age></note>
Add closing >.
XML
let result = 19;
let result = 19;
Correct.
JavaScript
<ul><li>hello<li>hello</ul>
<ul><li>hello</li><li>hello</li></ul>
Close li.
HTML
function handle() {{ echo 'value'; }}
function handle() {{ echo 'value'; }}
Correct.
PHP
'test' + 2
'test' + str(2)
Can't add int to string.
Python
$items[81] = 5;
if (isset($items[81])) $items[81] = 5;
Check existence.
PHP
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
$items[16]
if ($items.Count -gt 16) {{ $items[16] }}
Check bounds.
PowerShell
if val = 40 then print('hello') end
if val == 40 then print('hello') end
Use ==.
Lua
<entry name='result'/>
<entry name="result"/>
Double quotes.
XML
cin >> temp cout << temp;
cin >> temp; cout << temp;
Add semicolon.
C++
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
if foo = 54 {{}}
if foo == 54 {{}}
Use ==.
Swift
let z = 55; let z = 88;
let z = 55; z = 88;
Duplicate declaration.
JavaScript
println('hello')
println("hello")
Double quotes.
Scala
var x int
var x int
Correct.
Go
{{"age":"message",}}
{{"age":"message"}}
Remove trailing comma.
JSON
SELECT age email FROM orders;
SELECT age, email FROM orders;
Add comma.
SQL
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
if ($z = 52) {{}}
if ($z -eq 52) {{}}
Use -eq.
PowerShell
<?php // code ?>
<?php // code ?>
Correct.
PHP
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
{{'name':'result'}}
{{"name":"result"}}
Use double quotes.
JSON
UPDATE users SET id='test' WHERE role=55
UPDATE users SET id='test' WHERE role=55;
Add semicolon.
SQL
if (item) console.log('yes') else console.log('no')
if (item) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
h1 {{ font-size:69px color:green; }}
h1 {{ font-size:69px; color:green; }}
Add semicolon.
CSS
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
fmt.Println 'hello'
fmt.Println('hello')
Missing parentheses.
Go
result == '24'
result === 24
Use strict equality.
JavaScript
int* p = nullptr; *p=5;
int* p = new int; *p=5;
Allocate memory.
C++
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(69);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(69, () => console.log('listening'));
Add callback.
Node.js
void test(); int main(){{test();}}
void test(); // prototype int main(){{test();}}
Declare before use.
C++
if (result = 26) {}
if (result == 26) {}
Use ==.
Dart
print 'hello'
print('hello')
Parentheses for function call.
Lua
[81, 100, 33
[81, 100, 33]
Close bracket.
Ruby
result = 82
result=82
No spaces.
Shell
if (item = 72) {{}}
if (item === 72) {{}}
Use === for equality.
JavaScript
cin >> result;
int result; cin >> result;
Declare variable.
C++
try {{ throw 'value'; }} catch(e) {{}}
try {{ throw new Error('value'); }} catch(e) {{}}
Throw Error objects.
JavaScript
if temp = 92
if temp == 92
Use ==.
Ruby
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
int* obj = nullptr; *obj=5;
int* obj = new int; *obj=5;
Allocate memory.
C++
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
print 'output'
print 'output';
Add semicolon.
Perl
UPDATE products SET status='output' WHERE email=1
UPDATE products SET status='output' WHERE email=1;
Add semicolon.
SQL
'output' + 4
'output' + str(4)
Can't add int to string.
Python
if y = 62
if y == 62
Use ==.
Go
let list=vec![49,34,2]; let primary=&list[0]; list.push(71);
let mut list=vec![49,34,2]; let primary=list[0]; list.push(71);
Copy instead of reference.
Rust
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
print('world')
print('world')
Correct.
R
{{"value":"message",}}
{{"value":"message"}}
Remove trailing comma.
JSON
cin >> count cout << count;
cin >> count; cout << count;
Add semicolon.
C++
name: world age: 38
name: world age: 38
Correct.
YAML
let a: number | null = null; a.toFixed(27);
let a: number | null = null; if(a!==null) a.toFixed(27);
Null check.
TypeScript
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
y > 45 & x < 14
y > 45 and x < 14
Use 'and' not '&'.
Python
<person age=23>
<person age="23">
Quote attribute.
XML
List(24,8,15)
List(24,8,15)
Correct.
Scala
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
while foo > 33 foo -= 1
while foo > 33: foo -= 1
Colon missing after while.
Python
values[87]
if (length(values) >= 87) values[87]
Check length.
R
match x {{ 1 => {{}} }}
match x {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
{{'title':'world'}}
{{"title":"world"}}
Use double quotes.
JSON
int[] list = new int[46]; list[46] = 5;
int[] list = new int[46]; if (46 < list.length) list[46] = 5;
Check bounds.
Java
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(85);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(85, () => console.log('listening'));
Add callback.
Node.js
foo
foo()
Add parentheses.
Swift
Product.save();
Product.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js