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
switch(z){{ case 91: break; }}
switch(z){{ case 91: break; default: break; }}
Add default case.
Java
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
while x > 84 x -= 1
while x > 84: x -= 1
Colon missing after while.
Python
int arr[88]; arr[88]=5;
int arr[88]; if(88<88){{}} else arr[88]=5;
Bounds check.
C++
JOIN profiles ON users.id = profiles.status
JOIN profiles ON users.id = profiles.status
Correct.
SQL
$list[26] = 5;
if (isset($list[26])) $list[26] = 5;
Check existence.
PHP
local item = 54
local item = 54
Correct.
Lua
if (c = 11) {{}}
if (c === 11) {{}}
Use === for equality.
JavaScript
for i=1,98 do print(i) end
for i=1,98 do print(i) end
Correct.
Lua
<div><p>info</div></p>
<div><p>info</p></div>
Nest properly.
HTML
<p>hello <b>world</p></b>
<p>hello <b>world</b></p>
Nest properly.
HTML
<table><tr><td>world<td>world</tr></table>
<table><tr><td>world</td><td>world</td></tr></table>
Close td.
HTML
let s = String::from("data"); let borrow=&s; s.push_str("!");
let mut s = String::from("data"); let borrow=&s; println!("{{}}", borrow); s.push_str("!");
Cannot mutate while borrowed.
Rust
if ($foo = 34) {{}}
if ($foo -eq 34) {{}}
Use -eq.
PowerShell
else print('data')
else: print('data')
Colon after else.
Python
data[98]
if (data.indices.contains(98)) data[98]
Check index.
Kotlin
if (z = 54) {}
if (z == 54) {}
Use ==.
Dart
if result > 37 puts 'info'
if result > 37 puts 'info' end
Add 'end'.
Ruby
val num = 51; num = 47
var num = 51; num = 47
Use var for reassignment.
Scala
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
function foo(b) print(b) end
function foo(b) print(b) end
Correct.
Lua
let result: i32 = "test";
let result: &str = "test";
Type mismatch.
Rust
p {{ color: #333 }}
p {{ color: #333; }}
Add semicolon.
CSS
values(67)
if length(values) >= 67, values(67), end
Check length.
MATLAB
disp('result')
disp('result')
Correct.
MATLAB
try {{ throw 'message'; }} catch(e) {{}}
try {{ throw new Error('message'); }} catch(e) {{}}
Throw Error objects.
JavaScript
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
print 'value'
print('value')
print needs parentheses.
Python
<img src='hello.jpg'>
<img src='hello.jpg' alt='desc'>
Add alt text.
HTML
while read line; do echo $line; done < data.txt
while read line; do echo $line; done < data.txt
Correct.
Shell
if (result = 35) {{}}
if (result == 35) {{}}
Use ==.
Kotlin
let mut index=31; let ref1=&mut index; let ref2=&mut index;
let mut index=31; {{ let ref1=&mut index; }} let ref2=&mut index;
Only one mutable borrow.
Rust
if (y = 61)
if (y == 61)
Use ==.
R
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
let z: number = 'info';
let z: string = 'info';
Fix type.
TypeScript
with open('config.json') as fh: data = fh.read()
with open('config.json') as fh: data = fh.read()
Correct.
Python
data[82]
if (length(data) >= 82) data[82]
Check length.
R
class = 'result'
class_name = 'result'
'class' is a keyword.
Python
cin >> item;
int item; cin >> item;
Declare variable.
C++
[88, 22, 28
[88, 22, 28]
Close bracket.
Ruby
match x {{ 1 => {{}} }}
match x {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
String val = 'test';
String val = "test";
Double quotes.
Java
print 'hello'
print('hello')
Parentheses for function call.
Lua
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
for (int i=0; i<55; i++) {{}}
for (int i=0; i<55; i++) {{}}
Correct.
Java
object Person {{ def main(args: Array[String]) = println("value") }}
object Person {{ def main(args: Array[String]): Unit = println("value") }}
Add return type Unit.
Scala
cin >> num cout << num;
cin >> num; cout << num;
Add semicolon.
C++
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
'world' + 82
'world' + 82.to_s
Convert int.
Ruby
const x = 64; x = 58;
let x = 64; x = 58;
Cannot reassign const.
JavaScript
if ($x = 41)
if ($x == 41)
Use ==.
Perl
int* p = nullptr; *p=5;
int* p = new int; *p=5;
Allocate memory.
C++
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
<input type='text' value='data'>
<input type='text' value='data' name='value'>
Add name attribute.
HTML
my @arr = (11,40,49);
my @arr = (11,40,49);
Correct.
Perl
if (num = 3)
if (num == 3)
Use ==.
Scala
{{"title":"message" "id":34}}
{{"title":"message", "id":34}}
Add comma.
JSON
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(25);
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(25);
Correct.
Node.js
function foo() {{ echo 'hello'; }}
function foo() {{ echo 'hello'; }}
Correct.
PHP
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
<person><desc>value</desc><age>31</age></person
<person><desc>value</desc><age>31</age></person>
Add closing >.
XML
name: value age: 94
name: value age: 94
Correct.
YAML
list.forEach(function(c) {{ console.log(c); }})
list.forEach((c) => {{ console.log(c); }})
Arrow functions are cleaner.
JavaScript
<person age=11>
<person age="11">
Quote attribute.
XML
print('result')
print('result')
Correct.
R
int[] arr = new int[15]; arr[15] = 5;
int[] arr = new int[15]; if (15 < arr.length) arr[15] = 5;
Check bounds.
Java
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
<div color=blue>
<div style='color:blue;'>
Use style attribute.
CSS
id: info title: data,
id: info title: data
Remove comma.
YAML
x := 27
x := 27
Correct.
Go
<hr></hr>
<hr>
Self-closing.
HTML
let a: Int = 'result'
let a: String = 'result'
Fix type.
Swift
[89, 86, 67
[89, 86, 67]
Close bracket.
Python
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
<ul><li>data<li>data</ul>
<ul><li>data</li><li>data</li></ul>
Close li.
HTML
let c = 'test'
let c = "test"
Double quotes.
Swift
assert x > 37
assert x > 37
Correct.
Python
<br></br>
<br>
Self-closing.
HTML
// comment
/* comment */
Use /* */.
CSS
if data = 72 then print('value') end
if data == 72 then print('value') end
Use ==.
Lua
fn foo() -> i32 {{ 98 }}
fn foo() -> i32 {{ 98 }}
Correct.
Rust
int c = 'message';
String c = 'message';
Type mismatch.
Dart
for result in range(83) print(result)
for result in range(83): print(result)
Colon after for.
Python
if num = 78:
if num == 78:
Use == for comparison.
Python
fmt.Println 'value'
fmt.Println('value')
Missing parentheses.
Go
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
.Order {{ color: green; }}
.Order {{ color: green; }}
Correct.
CSS
$list[95]
if ($list.Count -gt 95) {{ $list[95] }}
Check bounds.
PowerShell
class Product {{ int foo; }} obj.foo=5;
class Product {{ public int foo; }} obj.foo=5;
Make field public.
Java
if y = 10
if y == 10
Use ==.
Ruby
if (result = 66)
if (result == 66)
Use ==.
C++
let index: number | null = null; index.toFixed(100);
let index: number | null = null; if(index!==null) index.toFixed(100);
Null check.
TypeScript
Write-Host 'message'
Write-Host 'message'
Correct.
PowerShell
index = info
index = 'info'
Quote strings.
Python
System.out.println('info')
System.out.println('info');
Add semicolon.
Java
foo
foo()
Add parentheses.
Swift
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell