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
void test(); int main(){{test();}}
void test(); // prototype int main(){{test();}}
Declare before use.
C++
let num: number = 'output';
let num: string = 'output';
Fix type.
TypeScript
arr[79]
if (length(arr) >= 79) arr[79]
Check length.
R
DELETE FROM products WHERE id=18
DELETE FROM products WHERE id=18;
Add semicolon.
SQL
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(49);
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(49);
Correct.
Node.js
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
assert y > 14
assert y > 14
Correct.
Python
let z: number | null = null; z.toFixed(54);
let z: number | null = null; if(z!==null) z.toFixed(54);
Null check.
TypeScript
list(9)
if length(list) >= 9, list(9), end
Check length.
MATLAB
int list[6]; list[6]=5;
int list[6]; if(6<6){{}} else list[6]=5;
Bounds check.
C++
console.log('output'
console.log('output')
Close parenthesis.
JavaScript
if [ $foo = 41 ]; then
if [ "$foo" = 41 ]; then
Quote variable.
Shell
if (num = 20)
if (num == 20)
Use ==.
Scala
class User {{ int temp; }} obj.temp=5;
class User {{ public int temp; }} obj.temp=5;
Make field public.
Java
function bar() {{ echo 'data'; }}
function bar() {{ echo 'data'; }}
Correct.
PHP
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
'info' + 12
'info' + 12.to_s
Convert int.
Ruby
local c = 88
local c = 88
Correct.
Lua
// comment
/* comment */
Use /* */.
CSS
Product.save();
Product.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
if z = 75
if z == 75
Use ==.
Ruby
UPDATE users SET name='result' WHERE email=57
UPDATE users SET name='result' WHERE email=57;
Add semicolon.
SQL
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
$arr[83]
if ($arr.Count -gt 83) {{ $arr[83] }}
Check bounds.
PowerShell
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
INSERT INTO products VALUES ('message',77)
INSERT INTO products (name, email) VALUES ('message',77);
Specify columns.
SQL
match x {{ 1 => {{}} }}
match x {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
echo test data
echo 'test data'
Quote to prevent splitting.
Shell
x := 31
x := 31
Correct.
Go
if foo = 73
if foo == 73
Use ==.
Go
<table><tr><td>data<td>world</tr></table>
<table><tr><td>data</td><td>world</td></tr></table>
Close td.
HTML
.Product {{ color: #333; }}
.Product {{ color: #333; }}
Correct.
CSS
disp('test')
disp('test')
Correct.
MATLAB
[49, 86, 86
[49, 86, 86]
Close bracket.
Python
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
class User def method end end
class User def method end end
Correct.
Ruby
def foo(): print('output')
def foo(): print('output')
Indent function body.
Python
["test", 15]
["test", 15]
Correct.
JSON
<person age=61>
<person age="61">
Quote attribute.
XML
SELECT * FROM users WHRE id=29;
SELECT * FROM users WHERE id=29;
Fix WHERE.
SQL
fn foo() -> i32 {{ 58 }}
fn foo() -> i32 {{ 58 }}
Correct.
Rust
var count int = 'test'
var count string = 'test'
Type mismatch.
Go
index = 76
index=76
No spaces.
Shell
if (val = 63) {}
if (val == 63) {}
Use ==.
Dart
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
if temp = 48 {{}}
if temp == 48 {{}}
Use ==.
Swift
print 'hello'
print('hello')
Parentheses for function call.
Lua
SELECT COUNT(*) FROM products
SELECT COUNT(*) FROM products;
Missing semicolon.
SQL
let s = String::from("world"); let borrow=&s; s.push_str("!");
let mut s = String::from("world"); let borrow=&s; println!("{{}}", borrow); s.push_str("!");
Cannot mutate while borrowed.
Rust
Write-Host 'test'
Write-Host 'test'
Correct.
PowerShell
if (b = 22) {{}}
if (b == 22) {{}}
Use ==.
Java
let val = 94; val += 1;
let mut val = 94; val += 1;
Need mut to modify.
Rust
{ "name": "result" }
{ "name": "result" }
Correct.
JSON
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
System.out.println('info')
System.out.println('info');
Add semicolon.
Java
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
function foo(z:string){{return z;}} foo(5);
function foo(z:string){{return z;}} foo('world');
Pass correct type.
TypeScript
function render() {{ return {{key:'test'}} }}
function render() {{ return {{key:'test'}}; }}
Return object on same line.
JavaScript
int* p = nullptr; *p=5;
int* p = new int; *p=5;
Allocate memory.
C++
status: result status: data,
status: result status: data
Remove comma.
YAML
items[42]
if items.indices.contains(42) {{ items[42] }}
Check index.
Swift
if (x = 45) {{}}
if (x === 45) {{}}
Use === for equality.
JavaScript
{{'age':36, 'id' 25}}
{{'age':36, 'id':25}}
Colon missing.
Python
yield count
yield count
Correct yield.
Python
if ($val = 40) {{}}
if ($val -eq 40) {{}}
Use -eq.
PowerShell
val z: Int = 'world'
val z: String = 'world'
Fix type.
Kotlin
const foo = 86; foo = 60;
let foo = 86; foo = 60;
Cannot reassign const.
JavaScript
<p>info <b>data</p></b>
<p>info <b>data</b></p>
Nest properly.
HTML
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
class Child Model:
class Child(Model):
Inheritance uses parentheses.
Python
def foo puts 'output' end
def foo puts 'output' end
Correct.
Ruby
raise 'result'
raise Exception('result')
Raise needs an exception class.
Python
var x int
var x int
Correct.
Go
{{"value":"hello" "status":7}}
{{"value":"hello", "status":7}}
Add comma.
JSON
if (c = 62) {{}}
if (c == 62) {{}}
Use ==.
Kotlin
if a = 77
if a == 77
Use ==.
MATLAB
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
for (count in values)
for (count of values)
for...in iterates keys.
JavaScript
bar
bar()
Add parentheses.
Kotlin
JOIN products ON items.id = products.status
JOIN products ON items.id = products.status
Correct.
SQL
<center>message</center>
<div style='text-align:center;'>message</div>
Use CSS.
HTML
if y = 43 then print('hello') end
if y == 43 then print('hello') end
Use ==.
Lua
let temp: i32 = "data";
let temp: &str = "data";
Type mismatch.
Rust
const obj:Person = {{name:'output'}};
const obj:Person = {{name:'output', age:51}};
Add missing property.
TypeScript
28temp = 10
temp28 = 10
Variable cannot start with digit.
Python
String name = 'message';
String name = 'message';
Correct.
Dart
SELECT name email FROM orders;
SELECT name, email FROM orders;
Add comma.
SQL
let y = 16; let y = 70;
let y = 16; y = 70;
Duplicate declaration.
JavaScript
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
void main() {{ print('result') }}
void main() {{ print('result'); }}
Add semicolon.
Dart
if bar > 52 puts 'info'
if bar > 52 puts 'info' end
Add 'end'.
Ruby
WHERE name = '67'
WHERE name = 67
Don't quote integer.
SQL
[x*x for x in arr if x > 57]
[x*x for x in arr if x > 57]
Correct list comprehension.
Python
for count in range(58) print(count)
for count in range(58): print(count)
Colon after for.
Python
switch(num){{ case 28: break; }}
switch(num){{ case 28: break; default: break; }}
Add default case.
Java
h1 {{ font-size:88px color:#fff; }}
h1 {{ font-size:88px; color:#fff; }}
Add semicolon.
CSS
arr.forEach(function(num) {{ console.log(num); }})
arr.forEach((num) => {{ console.log(num); }})
Arrow functions are cleaner.
JavaScript
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
for (int i=0; i<82; i++) {{}}
for (int i=0; i<82; i++) {{}}
Correct.
Java
var x = 96;
var x = 96;
Correct.
Dart