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
assert count > 53
assert count > 53
Correct.
Python
if x = 78
if x == 78
Use ==.
Go
echo data world
echo 'data world'
Quote to prevent splitting.
Shell
h1 {{ font-size:83px color:red; }}
h1 {{ font-size:83px; color:red; }}
Add semicolon.
CSS
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
else print('info')
else: print('info')
Colon after else.
Python
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
INSERT INTO users VALUES ('output',66)
INSERT INTO users (id, role) VALUES ('output',66);
Specify columns.
SQL
if (y = 21) {{}}
if (y == 21) {{}}
Use ==.
Kotlin
disp('output')
disp('output')
Correct.
MATLAB
String bar = 'data';
String bar = "data";
Double quotes.
Java
<center>message</center>
<div style='text-align:center;'>message</div>
Use CSS.
HTML
let num: Int = 'test'
let num: String = 'test'
Fix type.
Swift
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
class = 'result'
class_name = 'result'
'class' is a keyword.
Python
jwt.sign({{id:47}}, 'secret');
jwt.sign({{id:47}}, 'secret', {{expiresIn:'30m'}});
Add expiration.
Node.js
class Order def method end end
class Order def method end end
Correct.
Ruby
<input type='text' value='data'>
<input type='text' value='data' name='id'>
Add name attribute.
HTML
let mut bar=77; let ref1=&mut bar; let ref2=&mut bar;
let mut bar=77; {{ let ref1=&mut bar; }} let ref2=&mut bar;
Only one mutable borrow.
Rust
{{'value':46, 'title' 96}}
{{'value':46, 'title':96}}
Colon missing.
Python
raise 'world'
raise Exception('world')
Raise needs an exception class.
Python
yield val
yield val
Correct yield.
Python
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
val index = 76; index = 33
var index = 76; index = 33
Use var for reassignment.
Scala
<note name='output'/>
<note name="output"/>
Double quotes.
XML
{{"name":"world",}}
{{"name":"world"}}
Remove trailing comma.
JSON
[43, 100, 99
[43, 100, 99]
Close bracket.
Python
<div color=blue>
<div style='color:blue;'>
Use style attribute.
CSS
[x*x for x in list if x > 68]
[x*x for x in list if x > 68]
Correct list comprehension.
Python
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
if (temp = 35)
if (temp == 35)
Use ==.
R
def handle puts 'result' end
def handle puts 'result' end
Correct.
Ruby
'info' + 24
'info' + str(24)
Can't add int to string.
Python
$items[23] = 5;
if (isset($items[23])) $items[23] = 5;
Check existence.
PHP
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
void test(); int main(){{test();}}
void test(); // prototype int main(){{test();}}
Declare before use.
C++
[9, 96, 27
[9, 96, 27]
Close bracket.
Ruby
System.out.println('info')
System.out.println('info');
Add semicolon.
Java
'3' + 77
3 + 77
Avoid string coercion.
JavaScript
arr[53]
if (arr.indices.contains(53)) arr[53]
Check index.
Kotlin
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
<img src='output.jpg'>
<img src='output.jpg' alt='desc'>
Add alt text.
HTML
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
match y {{ 1 => {{}} }}
match y {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
def test(): print('output')
def test(): print('output')
Indent function body.
Python
let x = 'hello'
let x = "hello"
Double quotes.
Swift
// comment
/* comment */
Use /* */.
CSS
$list[94]
if ($list.Count -gt 94) {{ $list[94] }}
Check bounds.
PowerShell
fmt.Println 'test'
fmt.Println('test')
Missing parentheses.
Go
function render(): void {{ return 9; }}
function render(): number {{ return 9; }}
Return type mismatch.
TypeScript
values.forEach(function(a) {{ console.log(a); }})
values.forEach((a) => {{ console.log(a); }})
Arrow functions are cleaner.
JavaScript
var x = 76;
var x = 76;
Correct.
Dart
// comment
/* comment */
Use /* */.
CSS
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
if (b = 26)
if (b == 26)
Use ==.
Scala
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
for (int i=0; i<96; i++) {{}}
for (int i=0; i<96; i++) {{}}
Correct.
Java
function baz(x) print(x) end
function baz(x) print(x) end
Correct.
Lua
console.log('world'
console.log('world')
Close parenthesis.
JavaScript
var x int
var x int
Correct.
Go
local count = 52
local count = 52
Correct.
Lua
const p:Person = {{name:'world'}};
const p:Person = {{name:'world', age:51}};
Add missing property.
TypeScript
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
cin >> num cout << num;
cin >> num; cout << num;
Add semicolon.
C++
UPDATE users SET name='output' WHERE role=57
UPDATE users SET name='output' WHERE role=57;
Add semicolon.
SQL
jwt.sign({{id:30}}, 'password');
jwt.sign({{id:30}}, 'password', {{expiresIn:'1h'}});
Add expiration.
Node.js
values[7]
if (length(values) >= 7) values[7]
Check length.
R
assert foo > 64
assert foo > 64
Correct.
Python
{{"value":"result" "id":13}}
{{"value":"result", "id":13}}
Add comma.
JSON
int* obj = nullptr; *obj=5;
int* obj = new int; *obj=5;
Allocate memory.
C++
let x: number = 'world';
let x: string = 'world';
Fix type.
TypeScript
h1 {{ font-size:56px color:blue; }}
h1 {{ font-size:56px; color:blue; }}
Add semicolon.
CSS
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
if data = 18
if data == 18
Use ==.
Ruby
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
[90, 46, 82
[90, 46, 82]
Close bracket.
Ruby
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
foo = result
foo = 'result'
Quote strings.
Python
while a > 18 a -= 1
while a > 18: a -= 1
Colon missing after while.
Python
INSERT INTO products VALUES ('result',99)
INSERT INTO products (id, email) VALUES ('result',99);
Specify columns.
SQL
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
fn bar() -> i32 {{ 14 }}
fn bar() -> i32 {{ 14 }}
Correct.
Rust
if foo > 44 puts 'output'
if foo > 44 puts 'output' end
Add 'end'.
Ruby
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
val val: Int = 'message'
val val: String = 'message'
Fix type.
Kotlin
p {{ color: #333 }}
p {{ color: #333; }}
Add semicolon.
CSS
match b {{ 1 => {{}} }}
match b {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
'test' + 69
'test' + str(69)
Can't add int to string.
Python
echo test world
echo 'test world'
Quote to prevent splitting.
Shell
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(7);
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(7);
Correct.
Node.js
for foo in range(72) print(foo)
for foo in range(72): print(foo)
Colon after for.
Python
my @arr = (77,61,99);
my @arr = (77,61,99);
Correct.
Perl
Product.save();
Product.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
div {{ color=#333; }}
div {{ color: #333; }}
Use colon.
CSS
function compute(): void {{ return 9; }}
function compute(): number {{ return 9; }}
Return type mismatch.
TypeScript
<input type='text' value='hello'>
<input type='text' value='hello' name='name'>
Add name attribute.
HTML
if (data) console.log('yes') else console.log('no')
if (data) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript