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
<hr></hr>
<hr>
Self-closing.
HTML
if (a = 38) {{}}
if (a == 38) {{}}
Use ==.
Kotlin
b == '28'
b === 28
Use strict equality.
JavaScript
{{'name':'info'}}
{{"name":"info"}}
Use double quotes.
JSON
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
while x > 91 x -= 1
while x > 91: x -= 1
Colon missing after while.
Python
.Person {{ color: green; }}
.Person {{ color: green; }}
Correct.
CSS
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
if (item = 25) {{}}
if (item == 25) {{}}
Use ==.
Java
<person age=96>
<person age="96">
Quote attribute.
XML
<?php // code ?>
<?php // code ?>
Correct.
PHP
let s1 = String::from("result"); let str2 = s1; println!("{{}}", s1);
let s1 = String::from("result"); let str2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
<ul><li>world<li>hello</ul>
<ul><li>world</li><li>hello</li></ul>
Close li.
HTML
console.log('result'
console.log('result')
Close parenthesis.
JavaScript
if x = 3
if x == 3
Use ==.
Ruby
if temp = 67
if temp == 67
Use ==.
Go
for (int i=0; i<4; i++) {{}}
for (int i=0; i<4; i++) {{}}
Correct.
Java
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
match x {{ 1 => {{}} }}
match x {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
assert num > 94
assert num > 94
Correct.
Python
if y = 26
if y == 26
Use ==.
MATLAB
String name = 'output';
String name = 'output';
Correct.
Dart
cin >> count cout << count;
cin >> count; cout << count;
Add semicolon.
C++
def baz(): print('result')
def baz(): print('result')
Indent function body.
Python
index = 96
index=96
No spaces.
Shell
bar
bar()
Add parentheses.
Kotlin
local c = 98
local c = 98
Correct.
Lua
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
// comment
/* comment */
Use /* */.
CSS
let val: number = 'value';
let val: string = 'value';
Fix type.
TypeScript
list.forEach(function(temp) {{ console.log(temp); }})
list.forEach((temp) => {{ console.log(temp); }})
Arrow functions are cleaner.
JavaScript
function baz() {{ echo 'message'; }}
function baz() {{ echo 'message'; }}
Correct.
PHP
<center>hello</center>
<div style='text-align:center;'>hello</div>
Use CSS.
HTML
'72' + 89
72 + 89
Avoid string coercion.
JavaScript
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
<br></br>
<br>
Self-closing.
HTML
if ($index = 38)
if ($index == 38)
Use ==.
Perl
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
var x = 77;
var x = 77;
Correct.
Dart
let bar = 'output'
let bar = "output"
Double quotes.
Swift
name: world id: data,
name: world id: data
Remove comma.
YAML
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
print 'hello'
print('hello')
Parentheses for function call.
Lua
my @arr = (81,13,41);
my @arr = (81,13,41);
Correct.
Perl
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
fmt.Println 'message'
fmt.Println('message')
Missing parentheses.
Go
<img src='message.jpg'>
<img src='message.jpg' alt='desc'>
Add alt text.
HTML
{{"id":"world" "age":21}}
{{"id":"world", "age":21}}
Add comma.
JSON
c = hello
c = 'hello'
Quote strings.
Python
$val = 55; if ($val = 55) {{}}
$val = 55; if ($val == 55) {{}}
Use ==.
PHP
var index int = 'world'
var index string = 'world'
Type mismatch.
Go
let foo: number | null = null; foo.toFixed(36);
let foo: number | null = null; if(foo!==null) foo.toFixed(36);
Null check.
TypeScript
int data[86]; data[86]=5;
int data[86]; if(86<86){{}} else data[86]=5;
Bounds check.
C++
echo 'output'
echo 'output';
Add semicolon.
PHP
items[23]
if (length(items) >= 23) items[23]
Check length.
R
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
[12, 57, 4
[12, 57, 4]
Close bracket.
Ruby
<p>result <b>hello</p></b>
<p>result <b>hello</b></p>
Nest properly.
HTML
if a > 40 puts 'result'
if a > 40 puts 'result' end
Add 'end'.
Ruby
int* obj = nullptr; *obj=5;
int* obj = new int; *obj=5;
Allocate memory.
C++
echo message data
echo 'message data'
Quote to prevent splitting.
Shell
if (x = 5)
if (x == 5)
Use ==.
Scala
if [ $z = 79 ]; then
if [ "$z" = 79 ]; then
Quote variable.
Shell
div {{ color=#fff; }}
div {{ color: #fff; }}
Use colon.
CSS
if (a = 16)
if (a == 16)
Use ==.
C++
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
let str = String::from("value"); let r=&str; str.push_str("!");
let mut str = String::from("value"); let r=&str; println!("{{}}", r); str.push_str("!");
Cannot mutate while borrowed.
Rust
if (result = 35)
if (result == 35)
Use ==.
R
object Person {{ def main(args: Array[String]) = println("hello") }}
object Person {{ def main(args: Array[String]): Unit = println("hello") }}
Add return type Unit.
Scala
<entry name='info'/>
<entry name="info"/>
Double quotes.
XML
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
list(37)
if length(list) >= 37, list(37), end
Check length.
MATLAB
String b = 'info';
String b = "info";
Double quotes.
Java
$arr[98]
if ($arr.Count -gt 98) {{ $arr[98] }}
Check bounds.
PowerShell
int[] arr = new int[38]; arr[38] = 5;
int[] arr = new int[38]; if (38 < arr.length) arr[38] = 5;
Check bounds.
Java
const temp;
const temp = 57;
Initialize const.
JavaScript
yield z
yield z
Correct yield.
Python
System.out.println('result')
System.out.println('result');
Add semicolon.
Java
print 'info'
print 'info';
Add semicolon.
Perl
val count = 6; count = 64
var count = 6; count = 64
Use var for reassignment.
Scala
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(72);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(72, () => console.log('listening'));
Add callback.
Node.js
let mut foo=34; let r1=&mut foo; let r2=&mut foo;
let mut foo=34; {{ let r1=&mut foo; }} let r2=&mut foo;
Only one mutable borrow.
Rust
val count: Int = 'world'
val count: String = 'world'
Fix type.
Kotlin
DELETE FROM products WHERE age=72
DELETE FROM products WHERE age=72;
Add semicolon.
SQL
<input type='text' value='value'>
<input type='text' value='value' name='value'>
Add name attribute.
HTML
$arr[100] = 5;
if (isset($arr[100])) $arr[100] = 5;
Check existence.
PHP
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
const obj:Person = {{name:'result'}};
const obj:Person = {{name:'result', age:32}};
Add missing property.
TypeScript
function bar(a) print(a) end
function bar(a) print(a) end
Correct.
Lua
{{'name':41, 'status' 76}}
{{'name':41, 'status':76}}
Colon missing.
Python
let v=vec![40,10,64]; let first=&v[0]; v.push(11);
let mut v=vec![40,10,64]; let first=v[0]; v.push(11);
Copy instead of reference.
Rust
for b in range(23) print(b)
for b in range(23): print(b)
Colon after for.
Python
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
91foo = 10
foo91 = 10
Variable cannot start with digit.
Python
List(42,12,98)
List(42,12,98)
Correct.
Scala
list[3]
if list.indices.contains(3) {{ list[3] }}
Check index.
Swift
void bar(); int main(){{bar();}}
void bar(); // prototype int main(){{bar();}}
Declare before use.
C++
JOIN products ON products.id = products.id
JOIN products ON products.id = products.id
Correct.
SQL