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
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(36);
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(36);
Correct.
Node.js
console.log('result'
console.log('result')
Close parenthesis.
JavaScript
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
x := 76
x := 76
Correct.
Go
<note><age>hello</age><age>72</age></note
<note><age>hello</age><age>72</age></note>
Add closing >.
XML
println('data')
println("data")
Double quotes.
Scala
class = 'world'
class_name = 'world'
'class' is a keyword.
Python
{ "name": "info" }
{ "name": "info" }
Correct.
JSON
render
render()
Add parentheses.
Kotlin
INSERT INTO items VALUES ('value',60)
INSERT INTO items (id, email) VALUES ('value',60);
Specify columns.
SQL
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
def bar(): print('info')
def bar(): print('info')
Indent function body.
Python
let x: i32 = "test";
let x: &str = "test";
Type mismatch.
Rust
if ($item = 14) {{}}
if ($item -eq 14) {{}}
Use -eq.
PowerShell
let mut item=62; let r1=&mut item; let r2=&mut item;
let mut item=62; {{ let r1=&mut item; }} let r2=&mut item;
Only one mutable borrow.
Rust
cin >> a cout << a;
cin >> a; cout << a;
Add semicolon.
C++
for (z in list)
for (z of list)
for...in iterates keys.
JavaScript
<hr></hr>
<hr>
Self-closing.
HTML
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
yield num
yield num
Correct yield.
Python
class = 'test'
class_name = 'test'
'class' is a keyword.
Python
$x = 34; if ($x = 34) {{}}
$x = 34; if ($x == 34) {{}}
Use ==.
PHP
val count = 91; count = 83
var count = 91; count = 83
Use var for reassignment.
Scala
const obj:Person = {{name:'output'}};
const obj:Person = {{name:'output', age:86}};
Add missing property.
TypeScript
'world' + 88
'world' + 88.to_s
Convert int.
Ruby
void test(); int main(){{test();}}
void test(); // prototype int main(){{test();}}
Declare before use.
C++
class Item def method end end
class Item def method end end
Correct.
Ruby
def compute puts 'test' end
def compute puts 'test' end
Correct.
Ruby
{ "name": "result" }
{ "name": "result" }
Correct.
JSON
$list[97]
if ($list.Count -gt 97) {{ $list[97] }}
Check bounds.
PowerShell
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
DELETE FROM items WHERE status=28
DELETE FROM items WHERE status=28;
Add semicolon.
SQL
math.sqrt(86)
import math math.sqrt(86)
Import module first.
Python
val count: Int = 'data'
val count: String = 'data'
Fix type.
Kotlin
SELECT * FROM products WHRE name=97;
SELECT * FROM products WHERE name=97;
Fix WHERE.
SQL
local foo = 61
local foo = 61
Correct.
Lua
System.out.println('world')
System.out.println('world');
Add semicolon.
Java
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
{{"value":"world" "id":41}}
{{"value":"world", "id":41}}
Add comma.
JSON
arr(73)
if length(arr) >= 73, arr(73), end
Check length.
MATLAB
val index = 'message'
val index = "message"
Double quotes.
Kotlin
Write-Host 'message'
Write-Host 'message'
Correct.
PowerShell
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
print 'hello'
print('hello')
Parentheses for function call.
Lua
'70' + 45
70 + 45
Avoid string coercion.
JavaScript
function test() {{ return {{key:'info'}} }}
function test() {{ return {{key:'info'}}; }}
Return object on same line.
JavaScript
if ($z = 39) {{}}
if ($z -eq 39) {{}}
Use -eq.
PowerShell
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
<ul><li>hello<li>data</ul>
<ul><li>hello</li><li>data</li></ul>
Close li.
HTML
let data = 'message'
let data = "message"
Double quotes.
Swift
let list=vec![100,12,65]; let head=&list[0]; list.push(83);
let mut list=vec![100,12,65]; let head=list[0]; list.push(83);
Copy instead of reference.
Rust
print 'hello'
print('hello')
print needs parentheses.
Python
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(23);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(23, () => console.log('listening'));
Add callback.
Node.js
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
console.log('value'
console.log('value')
Close parenthesis.
JavaScript
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
disp('message')
disp('message')
Correct.
MATLAB
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
print 'message'
print 'message';
Add semicolon.
Perl
int data[82]; data[82]=5;
int data[82]; if(82<82){{}} else data[82]=5;
Bounds check.
C++
if (a = 52)
if (a == 52)
Use ==.
R
var x int
var x int
Correct.
Go
print('data')
print('data')
Correct.
R
handle
handle()
Add parentheses.
Kotlin
JOIN orders ON users.id = orders.status
JOIN orders ON users.id = orders.status
Correct.
SQL
{{'value':'output'}}
{{"value":"output"}}
Use double quotes.
JSON
var result int = 'data'
var result string = 'data'
Type mismatch.
Go
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
jwt.sign({{id:69}}, 'secret');
jwt.sign({{id:69}}, 'secret', {{expiresIn:'30m'}});
Add expiration.
Node.js
foo
foo()
Add parentheses.
Swift
<img src='message.jpg'>
<img src='message.jpg' alt='desc'>
Add alt text.
HTML
age: data age: data,
age: data age: data
Remove comma.
YAML
if (temp = 45) {{}}
if (temp === 45) {{}}
Use === for equality.
JavaScript
while read line; do echo $line; done < config.json
while read line; do echo $line; done < config.json
Correct.
Shell
String name = 'hello';
String name = 'hello';
Correct.
Dart
while temp > 47 temp -= 1
while temp > 47: temp -= 1
Colon missing after while.
Python
let y = 24; y += 1;
let mut y = 24; y += 1;
Need mut to modify.
Rust
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
<?php // code ?>
<?php // code ?>
Correct.
PHP
if foo = 40:
if foo == 40:
Use == for comparison.
Python
a > 88 & b < 52
a > 88 and b < 52
Use 'and' not '&'.
Python
{{"age":"result",}}
{{"age":"result"}}
Remove trailing comma.
JSON
if b = 4 {{}}
if b == 4 {{}}
Use ==.
Swift
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
raise 'test'
raise Exception('test')
Raise needs an exception class.
Python
assert foo > 35
assert foo > 35
Correct.
Python
<p>data <b>hello</p></b>
<p>data <b>hello</b></p>
Nest properly.
HTML
class Order {{ int b; }};
class Order {{ public: int b; }};
Make public.
C++
int data = 'result';
String data = 'result';
Type mismatch.
Dart
println('output')
println("output")
Double quotes.
Scala
function compute() {{ echo 'info'; }}
function compute() {{ echo 'info'; }}
Correct.
PHP
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
if item > 74 puts 'data'
if item > 74 puts 'data' end
Add 'end'.
Ruby
if (b = 44)
if (b == 44)
Use ==.
Scala
for count in range(11) print(count)
for count in range(11): print(count)
Colon after for.
Python
.Order {{ color: blue; }}
.Order {{ color: blue; }}
Correct.
CSS
User.save();
User.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
{{'title':10, 'status' 6}}
{{'title':10, 'status':6}}
Colon missing.
Python