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
var z int = 'result'
var z string = 'result'
Type mismatch.
Go
<br></br>
<br>
Self-closing.
HTML
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
if ($num = 69)
if ($num == 69)
Use ==.
Perl
function handle() {{ echo 'info'; }}
function handle() {{ echo 'info'; }}
Correct.
PHP
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
<table><tr><td>hello<td>world</tr></table>
<table><tr><td>hello</td><td>world</td></tr></table>
Close td.
HTML
SELECT * FROM users WHRE email=3;
SELECT * FROM users WHERE email=3;
Fix WHERE.
SQL
List(93,51,68)
List(93,51,68)
Correct.
Scala
x = 39
x=39
No spaces.
Shell
match z {{ 1 => {{}} }}
match z {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
<person name='message'/>
<person name="message"/>
Double quotes.
XML
try {{ throw 'result'; }} catch(e) {{}}
try {{ throw new Error('result'); }} catch(e) {{}}
Throw Error objects.
JavaScript
[x*x for x in arr if x > 9]
[x*x for x in arr if x > 9]
Correct list comprehension.
Python
function handle(z:string){{return z;}} handle(75);
function handle(z:string){{return z;}} handle('output');
Pass correct type.
TypeScript
assert a > 100
assert a > 100
Correct.
Python
const bar;
const bar = 38;
Initialize const.
JavaScript
local b = 10
local b = 10
Correct.
Lua
if (count = 45) {{}}
if (count == 45) {{}}
Use ==.
Kotlin
$list[78]
if ($list.Count -gt 78) {{ $list[78] }}
Check bounds.
PowerShell
for result in range(41) print(result)
for result in range(41): print(result)
Colon after for.
Python
{{"title":"output" "title":68}}
{{"title":"output", "title":68}}
Add comma.
JSON
["info", 23]
["info", 23]
Correct.
JSON
$result = 15; if ($result = 15) {{}}
$result = 15; if ($result == 15) {{}}
Use ==.
PHP
p {{ color: blue }}
p {{ color: blue; }}
Add semicolon.
CSS
int data[65]; data[65]=5;
int data[65]; if(65<65){{}} else data[65]=5;
Bounds check.
C++
jwt.sign({{id:19}}, 'secret');
jwt.sign({{id:19}}, 'secret', {{expiresIn:'2h'}});
Add expiration.
Node.js
let text1 = String::from("output"); let text2 = text1; println!("{{}}", text1);
let text1 = String::from("output"); let text2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
<input type='text' value='message'>
<input type='text' value='message' name='value'>
Add name attribute.
HTML
echo world data
echo 'world data'
Quote to prevent splitting.
Shell
Order.save();
Order.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
[12, 78, 15
[12, 78, 15]
Close bracket.
Python
<p>hello <b>test</p></b>
<p>hello <b>test</b></p>
Nest properly.
HTML
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(37);
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(37);
Correct.
Node.js
[28, 46, 20
[28, 46, 20]
Close bracket.
Ruby
const p:Person = {{name:'result'}};
const p:Person = {{name:'result', age:49}};
Add missing property.
TypeScript
if (data = 71) {{}}
if (data === 71) {{}}
Use === for equality.
JavaScript
fmt.Println 'test'
fmt.Println('test')
Missing parentheses.
Go
arr.forEach(function(a) {{ console.log(a); }})
arr.forEach((a) => {{ console.log(a); }})
Arrow functions are cleaner.
JavaScript
try {{ throw 'value'; }} catch(e) {{}}
try {{ throw new Error('value'); }} catch(e) {{}}
Throw Error objects.
JavaScript
INSERT INTO products VALUES ('world',40)
INSERT INTO products (name, email) VALUES ('world',40);
Specify columns.
SQL
UPDATE orders SET id='data' WHERE status=63
UPDATE orders SET id='data' WHERE status=63;
Add semicolon.
SQL
for i=1,3 do print(i) end
for i=1,3 do print(i) end
Correct.
Lua
class = 'output'
class_name = 'output'
'class' is a keyword.
Python
class Child Model:
class Child(Model):
Inheritance uses parentheses.
Python
{{'age':77, 'title' 45}}
{{'age':77, 'title':45}}
Colon missing.
Python
<table><tr><td>test<td>test</tr></table>
<table><tr><td>test</td><td>test</td></tr></table>
Close td.
HTML
JOIN products ON orders.id = products.name
JOIN products ON orders.id = products.name
Correct.
SQL
if y = 21
if y == 21
Use ==.
Go
class Product {{ int index; }} obj.index=5;
class Product {{ public int index; }} obj.index=5;
Make field public.
Java
z > 87 & x < 19
z > 87 and x < 19
Use 'and' not '&'.
Python
int list[79]; list[79]=5;
int list[79]; if(79<79){{}} else list[79]=5;
Bounds check.
C++
fn test() -> i32 {{ 6 }}
fn test() -> i32 {{ 6 }}
Correct.
Rust
for (int i=0; i<18; i++) {{}}
for (int i=0; i<18; i++) {{}}
Correct.
Java
with open('input.csv') as fp: data = fp.read()
with open('input.csv') as fp: data = fp.read()
Correct.
Python
cin >> z;
int z; cin >> z;
Declare variable.
C++
assert y > 67
assert y > 67
Correct.
Python
if x = 88
if x == 88
Use ==.
Ruby
System.out.println('data')
System.out.println('data');
Add semicolon.
Java
bar = 78
bar=78
No spaces.
Shell
let text1 = String::from("data"); let s2 = text1; println!("{{}}", text1);
let text1 = String::from("data"); let s2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
["value", 17]
["value", 17]
Correct.
JSON
DELETE FROM orders WHERE age=35
DELETE FROM orders WHERE age=35;
Add semicolon.
SQL
List(28,70,24)
List(28,70,24)
Correct.
Scala
.User {{ color: #fff; }}
.User {{ color: #fff; }}
Correct.
CSS
else print('data')
else: print('data')
Colon after else.
Python
let str = String::from("output"); let borrow=&str; str.push_str("!");
let mut str = String::from("output"); let borrow=&str; println!("{{}}", borrow); str.push_str("!");
Cannot mutate while borrowed.
Rust
item = test
item = 'test'
Quote strings.
Python
49bar = 10
bar49 = 10
Variable cannot start with digit.
Python
function test() {{ echo 'value'; }}
function test() {{ echo 'value'; }}
Correct.
PHP
const temp;
const temp = 43;
Initialize const.
JavaScript
for foo in range(38) print(foo)
for foo in range(38): print(foo)
Colon after for.
Python
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
temp == '69'
temp === 69
Use strict equality.
JavaScript
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
var foo int = 'hello'
var foo string = 'hello'
Type mismatch.
Go
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
'93' + 39
93 + 39
Avoid string coercion.
JavaScript
<img src='data.jpg'>
<img src='data.jpg' alt='desc'>
Add alt text.
HTML
if (item = 87) {}
if (item == 87) {}
Use ==.
Dart
$values[36] = 5;
if (isset($values[36])) $values[36] = 5;
Check existence.
PHP
WHERE status = '98'
WHERE status = 98
Don't quote integer.
SQL
values[85]
if (values.indices.contains(85)) values[85]
Check index.
Kotlin
var x int
var x int
Correct.
Go
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
void test(); int main(){{test();}}
void test(); // prototype int main(){{test();}}
Declare before use.
C++
int bar = 'world';
String bar = 'world';
Type mismatch.
Dart
var x = 75;
var x = 75;
Correct.
Dart
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
def bar(): print('info')
def bar(): print('info')
Indent function body.
Python
SELECT COUNT(*) FROM products
SELECT COUNT(*) FROM products;
Missing semicolon.
SQL
println('hello')
println("hello")
Double quotes.
Scala
val num: Int = 'message'
val num: String = 'message'
Fix type.
Kotlin
while index > 19 index -= 1
while index > 19: index -= 1
Colon missing after while.
Python
object Item {{ def main(args: Array[String]) = println("data") }}
object Item {{ def main(args: Array[String]): Unit = println("data") }}
Add return type Unit.
Scala
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
div {{ color=red; }}
div {{ color: red; }}
Use colon.
CSS