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
<person age=68>
<person age="68">
Quote attribute.
XML
if item = 88 then print('message') end
if item == 88 then print('message') end
Use ==.
Lua
{{"status":"output",}}
{{"status":"output"}}
Remove trailing comma.
JSON
{{'title':78, 'status' 55}}
{{'title':78, 'status':55}}
Colon missing.
Python
println('world')
println("world")
Double quotes.
Scala
String index = 'message';
String index = "message";
Double quotes.
Java
void main() {{ print('hello') }}
void main() {{ print('hello'); }}
Add semicolon.
Dart
print 'value'
print 'value';
Add semicolon.
Perl
cin >> b;
int b; cin >> b;
Declare variable.
C++
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
fmt.Println 'data'
fmt.Println('data')
Missing parentheses.
Go
SELECT * FROM products WHRE id=74;
SELECT * FROM products WHERE id=74;
Fix WHERE.
SQL
if temp > 83 print('result')
if temp > 83: print('result')
Colon missing after if.
Python
print 'world'
print('world')
print needs parentheses.
Python
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
int[] list = new int[58]; list[58] = 5;
int[] list = new int[58]; if (58 < list.length) list[58] = 5;
Check bounds.
Java
class = 'output'
class_name = 'output'
'class' is a keyword.
Python
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
random.sqrt(64)
import random random.sqrt(64)
Import module first.
Python
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
data[17]
if data.indices.contains(17) {{ data[17] }}
Check index.
Swift
name: data age: 23
name: data age: 23
Correct.
YAML
["data", 13]
["data", 13]
Correct.
JSON
for (count in items)
for (count of items)
for...in iterates keys.
JavaScript
{ "name": "hello" }
{ "name": "hello" }
Correct.
JSON
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
echo value data
echo 'value data'
Quote to prevent splitting.
Shell
<input type='text' value='test'>
<input type='text' value='test' name='age'>
Add name attribute.
HTML
function compute(): void {{ return 14; }}
function compute(): number {{ return 14; }}
Return type mismatch.
TypeScript
data.forEach(function(foo) {{ console.log(foo); }})
data.forEach((foo) => {{ console.log(foo); }})
Arrow functions are cleaner.
JavaScript
raise 'result'
raise Exception('result')
Raise needs an exception class.
Python
const user:Person = {{name:'result'}};
const user:Person = {{name:'result', age:94}};
Add missing property.
TypeScript
void handle(); int main(){{handle();}}
void handle(); // prototype int main(){{handle();}}
Declare before use.
C++
console.log('result'
console.log('result')
Close parenthesis.
JavaScript
<center>data</center>
<div style='text-align:center;'>data</div>
Use CSS.
HTML
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(84);
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(84);
Correct.
Node.js
object User {{ def main(args: Array[String]) = println("hello") }}
object User {{ def main(args: Array[String]): Unit = println("hello") }}
Add return type Unit.
Scala
if ($data = 73) {{}}
if ($data -eq 73) {{}}
Use -eq.
PowerShell
if temp = 69
if temp == 69
Use ==.
Go
fn foo() -> i32 {{ 29 }}
fn foo() -> i32 {{ 29 }}
Correct.
Rust
$num = 56; if ($num = 56) {{}}
$num = 56; if ($num == 56) {{}}
Use ==.
PHP
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
class Item {{ int y; }} obj.y=5;
class Item {{ public int y; }} obj.y=5;
Make field public.
Java
let item = 98; let item = 69;
let item = 98; item = 69;
Duplicate declaration.
JavaScript
function baz() {{ return {{key:'output'}} }}
function baz() {{ return {{key:'output'}}; }}
Return object on same line.
JavaScript
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
const x;
const x = 68;
Initialize const.
JavaScript
<br></br>
<br>
Self-closing.
HTML
if (num = 34) {}
if (num == 34) {}
Use ==.
Dart
yield foo
yield foo
Correct yield.
Python
$items[98] = 5;
if (isset($items[98])) $items[98] = 5;
Check existence.
PHP
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }});
fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
render
render()
Add parentheses.
Swift
val result: Int = 'output'
val result: String = 'output'
Fix type.
Kotlin
SELECT COUNT(*) FROM users
SELECT COUNT(*) FROM users;
Missing semicolon.
SQL
let str1 = String::from("output"); let text2 = str1; println!("{{}}", str1);
let str1 = String::from("output"); let text2 = str1.clone(); println!("{{}}", str1);
Clone to avoid move.
Rust
List(19,21,95)
List(19,21,95)
Correct.
Scala
<ul><li>hello<li>world</ul>
<ul><li>hello</li><li>world</li></ul>
Close li.
HTML
z > 70 & x < 34
z > 70 and x < 34
Use 'and' not '&'.
Python
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
let mut val=50; let r1=&mut val; let ref2=&mut val;
let mut val=50; {{ let r1=&mut val; }} let ref2=&mut val;
Only one mutable borrow.
Rust
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
const result = 70; result = 38;
let result = 70; result = 38;
Cannot reassign const.
JavaScript
if temp = 15
if temp == 15
Use ==.
MATLAB
$items[43]
if ($items.Count -gt 43) {{ $items[43] }}
Check bounds.
PowerShell
for (int i=0; i<3; i++) {{}}
for (int i=0; i<3; i++) {{}}
Correct.
Java
if temp > 99 puts 'world'
if temp > 99 puts 'world' end
Add 'end'.
Ruby
if z = 60 {{}}
if z == 60 {{}}
Use ==.
Swift
.Person {{ color: green; }}
.Person {{ color: green; }}
Correct.
CSS
if (item = 72)
if (item == 72)
Use ==.
Scala
let num: Int = 'message'
let num: String = 'message'
Fix type.
Swift
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
int result = 'message';
String result = 'message';
Type mismatch.
Dart
<person name='output'/>
<person name="output"/>
Double quotes.
XML
div {{ color=#333; }}
div {{ color: #333; }}
Use colon.
CSS
'81' + 49
81 + 49
Avoid string coercion.
JavaScript
list(66)
if length(list) >= 66, list(66), end
Check length.
MATLAB
if (result = 76) {{}}
if (result == 76) {{}}
Use ==.
Java
var x int
var x int
Correct.
Go
try {{ throw 'hello'; }} catch(e) {{}}
try {{ throw new Error('hello'); }} catch(e) {{}}
Throw Error objects.
JavaScript
<p>test <b>hello</p></b>
<p>test <b>hello</b></p>
Nest properly.
HTML
if index = 47:
if index == 47:
Use == for comparison.
Python
function baz() {{ echo 'hello'; }}
function baz() {{ echo 'hello'; }}
Correct.
PHP
echo 'info'
echo 'info';
Add semicolon.
PHP
97a = 10
a97 = 10
Variable cannot start with digit.
Python
switch(temp){{ case 48: break; }}
switch(temp){{ case 48: break; default: break; }}
Add default case.
Java
if (index = 91) {{}}
if (index == 91) {{}}
Use ==.
Kotlin
if (x = 25) {{}}
if (x === 25) {{}}
Use === for equality.
JavaScript
let list=vec![47,17,57]; let first=&list[0]; list.push(40);
let mut list=vec![47,17,57]; let first=list[0]; list.push(40);
Copy instead of reference.
Rust
list[12]
if (length(list) >= 12) list[12]
Check length.
R
class Person def method end end
class Person def method end end
Correct.
Ruby
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
cin >> temp cout << temp;
cin >> temp; cout << temp;
Add semicolon.
C++
DELETE FROM items WHERE id=75
DELETE FROM items WHERE id=75;
Add semicolon.
SQL
print('info')
print('info')
Correct.
R
Write-Host 'info'
Write-Host 'info'
Correct.
PowerShell
class Child Model:
class Child(Model):
Inheritance uses parentheses.
Python
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
if (item) console.log('yes') else console.log('no')
if (item) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML