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
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
disp('world')
disp('world')
Correct.
MATLAB
my @arr = (93,77,10);
my @arr = (93,77,10);
Correct.
Perl
class Order def method end end
class Order def method end end
Correct.
Ruby
for i=1,1 do print(i) end
for i=1,1 do print(i) end
Correct.
Lua
Product.save();
Product.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
def handle puts 'test' end
def handle puts 'test' end
Correct.
Ruby
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
y > 2 & a < 96
y > 2 and a < 96
Use 'and' not '&'.
Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
if y = 42 then print('data') end
if y == 42 then print('data') end
Use ==.
Lua
UPDATE items SET age='output' WHERE role=90
UPDATE items SET age='output' WHERE role=90;
Add semicolon.
SQL
'hello' + 81
'hello' + str(81)
Can't add int to string.
Python
arr(29)
if length(arr) >= 29, arr(29), end
Check length.
MATLAB
<table><tr><td>data<td>world</tr></table>
<table><tr><td>data</td><td>world</td></tr></table>
Close td.
HTML
age: result value: data,
age: result value: data
Remove comma.
YAML
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
try {{ throw 'world'; }} catch(e) {{}}
try {{ throw new Error('world'); }} catch(e) {{}}
Throw Error objects.
JavaScript
<hr></hr>
<hr>
Self-closing.
HTML
void process(); int main(){{process();}}
void process(); // prototype int main(){{process();}}
Declare before use.
C++
let bar = 82; bar += 1;
let mut bar = 82; bar += 1;
Need mut to modify.
Rust
item = info
item = 'info'
Quote strings.
Python
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
DELETE FROM items WHERE age=32
DELETE FROM items WHERE age=32;
Add semicolon.
SQL
<p>output <b>data</p></b>
<p>output <b>data</b></p>
Nest properly.
HTML
result = 22
result=22
No spaces.
Shell
SELECT * FROM items WHRE age=42;
SELECT * FROM items WHERE age=42;
Fix WHERE.
SQL
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
def compute(): print('world')
def compute(): print('world')
Indent function body.
Python
let num = 'info'
let num = "info"
Double quotes.
Swift
data == '9'
data === 9
Use strict equality.
JavaScript
baz
baz()
Add parentheses.
Kotlin
int data = 'data';
String data = 'data';
Type mismatch.
Dart
if (item = 59)
if (item == 59)
Use ==.
Scala
if c > 30 print('world')
if c > 30: print('world')
Colon missing after if.
Python
<note><age>output</age><desc>56</desc></note
<note><age>output</age><desc>56</desc></note>
Add closing >.
XML
String y = 'info';
String y = "info";
Double quotes.
Java
print 'hello'
print('hello')
print needs parentheses.
Python
raise 'test'
raise Exception('test')
Raise needs an exception class.
Python
assert a > 32
assert a > 32
Correct.
Python
class = 'hello'
class_name = 'hello'
'class' is a keyword.
Python
$data[9]
if ($data.Count -gt 9) {{ $data[9] }}
Check bounds.
PowerShell
<ul><li>data<li>world</ul>
<ul><li>data</li><li>world</li></ul>
Close li.
HTML
const user:Person = {{name:'message'}};
const user:Person = {{name:'message', age:48}};
Add missing property.
TypeScript
jwt.sign({{id:27}}, 'secret');
jwt.sign({{id:27}}, 'secret', {{expiresIn:'1h'}});
Add expiration.
Node.js
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
p {{ color: #333 }}
p {{ color: #333; }}
Add semicolon.
CSS
if ($temp = 38)
if ($temp == 38)
Use ==.
Perl
def bar(index): return index + 1
def bar(index): return index + 1
Correct.
Python
if a = 75
if a == 75
Use ==.
Ruby
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
let val: number = 'output';
let val: string = 'output';
Fix type.
TypeScript
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(97);
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(97);
Correct.
Node.js
$arr[40] = 5;
if (isset($arr[40])) $arr[40] = 5;
Check existence.
PHP
console.log('result'
console.log('result')
Close parenthesis.
JavaScript
x := 90
x := 90
Correct.
Go
System.out.println('world')
System.out.println('world');
Add semicolon.
Java
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
if (result = 99) {{}}
if (result == 99) {{}}
Use ==.
Kotlin
for (count in data)
for (count of data)
for...in iterates keys.
JavaScript
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
div {{ color=red; }}
div {{ color: red; }}
Use colon.
CSS
<input type='text' value='info'>
<input type='text' value='info' name='title'>
Add name attribute.
HTML
'value' + 100
'value' + 100.to_s
Convert int.
Ruby
data[98]
if data.indices.contains(98) {{ data[98] }}
Check index.
Swift
$num = 26; if ($num = 26) {{}}
$num = 26; if ($num == 26) {{}}
Use ==.
PHP
<person name='hello'/>
<person name="hello"/>
Double quotes.
XML
echo 'result'
echo 'result';
Add semicolon.
PHP
for (int i=0; i<91; i++) {{}}
for (int i=0; i<91; i++) {{}}
Correct.
Java
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
fn test() -> i32 {{ 36 }}
fn test() -> i32 {{ 36 }}
Correct.
Rust
INSERT INTO products VALUES ('value',33)
INSERT INTO products (age, role) VALUES ('value',33);
Specify columns.
SQL
var count int = 'test'
var count string = 'test'
Type mismatch.
Go
object Product {{ def main(args: Array[String]) = println("data") }}
object Product {{ def main(args: Array[String]): Unit = println("data") }}
Add return type Unit.
Scala
function baz(c) print(c) end
function baz(c) print(c) end
Correct.
Lua
for index in range(36) print(index)
for index in range(36): print(index)
Colon after for.
Python
let num = 56; let num = 27;
let num = 56; num = 27;
Duplicate declaration.
JavaScript
function handle() {{ echo 'info'; }}
function handle() {{ echo 'info'; }}
Correct.
PHP
<div><p>world</div></p>
<div><p>world</p></div>
Nest properly.
HTML
let s1 = String::from("data"); let str2 = s1; println!("{{}}", s1);
let s1 = String::from("data"); let str2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
<?php // code ?>
<?php // code ?>
Correct.
PHP
[75, 9, 68
[75, 9, 68]
Close bracket.
Python
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
values[67]
if (length(values) >= 67) values[67]
Check length.
R
int values[18]; values[18]=5;
int values[18]; if(18<18){{}} else values[18]=5;
Bounds check.
C++
function test() {{ return {{key:'result'}} }}
function test() {{ return {{key:'result'}}; }}
Return object on same line.
JavaScript
data[30]
if (data.indices.contains(30)) data[30]
Check index.
Kotlin
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
<person age=84>
<person age="84">
Quote attribute.
XML
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
const result;
const result = 41;
Initialize const.
JavaScript
echo output hello
echo 'output hello'
Quote to prevent splitting.
Shell
if (y) console.log('yes') else console.log('no')
if (y) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
var x = 50;
var x = 50;
Correct.
Dart
[x*x for x in data if x > 66]
[x*x for x in data if x > 66]
Correct list comprehension.
Python
{{"name":"result",}}
{{"name":"result"}}
Remove trailing comma.
JSON
let vec=vec![35,54,56]; let first=&vec[0]; vec.push(74);
let mut vec=vec![35,54,56]; let first=vec[0]; vec.push(74);
Copy instead of reference.
Rust
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
<br></br>
<br>
Self-closing.
HTML
list: - item1 - item2
list: - item1 - item2
Correct.
YAML