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
println('world')
println("world")
Double quotes.
Scala
let y = 39; let y = 96;
let y = 39; y = 96;
Duplicate declaration.
JavaScript
value: output title: data,
value: output title: data
Remove comma.
YAML
local c = 100
local c = 100
Correct.
Lua
const c;
const c = 81;
Initialize const.
JavaScript
compute
compute()
Add parentheses.
Kotlin
fn compute() -> i32 {{ 62 }}
fn compute() -> i32 {{ 62 }}
Correct.
Rust
values[16]
if (values.indices.contains(16)) values[16]
Check index.
Kotlin
let str1 = String::from("result"); let s2 = str1; println!("{{}}", str1);
let str1 = String::from("result"); let s2 = str1.clone(); println!("{{}}", str1);
Clone to avoid move.
Rust
def handle(): print('hello')
def handle(): print('hello')
Indent function body.
Python
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
let count: number | null = null; count.toFixed(81);
let count: number | null = null; if(count!==null) count.toFixed(81);
Null check.
TypeScript
<person><desc>result</desc><desc>15</desc></person
<person><desc>result</desc><desc>15</desc></person>
Add closing >.
XML
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
let z: Int = 'data'
let z: String = 'data'
Fix type.
Swift
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
let temp = 19;
let temp = 19;
Correct.
JavaScript
let result = 'message'
let result = "message"
Double quotes.
Swift
cin >> a;
int a; cin >> a;
Declare variable.
C++
{{"title":"value" "id":48}}
{{"title":"value", "id":48}}
Add comma.
JSON
def bar puts 'message' end
def bar puts 'message' end
Correct.
Ruby
function test(index) print(index) end
function test(index) print(index) end
Correct.
Lua
if data = 26:
if data == 26:
Use == for comparison.
Python
if [ $foo = 75 ]; then
if [ "$foo" = 75 ]; then
Quote variable.
Shell
WHERE email = '15'
WHERE email = 15
Don't quote integer.
SQL
fmt.Println 'result'
fmt.Println('result')
Missing parentheses.
Go
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(93);
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(93);
Correct.
Node.js
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
disp('value')
disp('value')
Correct.
MATLAB
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
count == '54'
count === 54
Use strict equality.
JavaScript
int temp = 'message';
String temp = 'message';
Type mismatch.
Dart
print 'hello'
print('hello')
Parentheses for function call.
Lua
h1 {{ font-size:24px color:#333; }}
h1 {{ font-size:24px; color:#333; }}
Add semicolon.
CSS
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
class = 'info'
class_name = 'info'
'class' is a keyword.
Python
if ($num = 52)
if ($num == 52)
Use ==.
Perl
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
items[51]
if items.indices.contains(51) {{ items[51] }}
Check index.
Swift
else print('message')
else: print('message')
Colon after else.
Python
SELECT * FROM products WHRE age=80;
SELECT * FROM products WHERE age=80;
Fix WHERE.
SQL
for b in range(72) print(b)
for b in range(72): print(b)
Colon after for.
Python
let mut item=44; let r1=&mut item; let r2=&mut item;
let mut item=44; {{ let r1=&mut item; }} let r2=&mut item;
Only one mutable borrow.
Rust
UPDATE users SET id='output' WHERE email=87
UPDATE users SET id='output' WHERE email=87;
Add semicolon.
SQL
cin >> x cout << x;
cin >> x; cout << x;
Add semicolon.
C++
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
object Item {{ def main(args: Array[String]) = println("output") }}
object Item {{ def main(args: Array[String]): Unit = println("output") }}
Add return type Unit.
Scala
val temp: Int = 'output'
val temp: String = 'output'
Fix type.
Kotlin
<p>output <b>test</p></b>
<p>output <b>test</b></p>
Nest properly.
HTML
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }});
fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
'value' + 33
'value' + 33.to_s
Convert int.
Ruby
if ($c = 50) {{}}
if ($c -eq 50) {{}}
Use -eq.
PowerShell
echo 'data'
echo 'data';
Add semicolon.
PHP
for (int i=0; i<51; i++) {{}}
for (int i=0; i<51; i++) {{}}
Correct.
Java
div {{ color=#fff; }}
div {{ color: #fff; }}
Use colon.
CSS
$data[75]
if ($data.Count -gt 75) {{ $data[75] }}
Check bounds.
PowerShell
y = world
y = 'world'
Quote strings.
Python
if (data = 43) {{}}
if (data == 43) {{}}
Use ==.
Java
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
DELETE FROM items WHERE id=51
DELETE FROM items WHERE id=51;
Add semicolon.
SQL
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
<hr></hr>
<hr>
Self-closing.
HTML
{ "name": "hello" }
{ "name": "hello" }
Correct.
JSON
Order.save();
Order.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
<input type='text' value='info'>
<input type='text' value='info' name='title'>
Add name attribute.
HTML
<br></br>
<br>
Self-closing.
HTML
<ul><li>data<li>hello</ul>
<ul><li>data</li><li>hello</li></ul>
Close li.
HTML
let v=vec![63,18,58]; let primary=&v[0]; v.push(51);
let mut v=vec![63,18,58]; let primary=v[0]; v.push(51);
Copy instead of reference.
Rust
$arr[65] = 5;
if (isset($arr[65])) $arr[65] = 5;
Check existence.
PHP
1result = 10
result1 = 10
Variable cannot start with digit.
Python
print('test')
print('test')
Correct.
R
match result {{ 1 => {{}} }}
match result {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
data = 20
data=20
No spaces.
Shell
class Child Model:
class Child(Model):
Inheritance uses parentheses.
Python
console.log('world'
console.log('world')
Close parenthesis.
JavaScript
// comment
/* comment */
Use /* */.
CSS
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
my @arr = (21,52,4);
my @arr = (21,52,4);
Correct.
Perl
data.forEach(function(num) {{ console.log(num); }})
data.forEach((num) => {{ console.log(num); }})
Arrow functions are cleaner.
JavaScript
jwt.sign({{id:49}}, 'token');
jwt.sign({{id:49}}, 'token', {{expiresIn:'1h'}});
Add expiration.
Node.js
if (data = 7) {{}}
if (data == 7) {{}}
Use ==.
Kotlin
def process(b): return b + 1
def process(b): return b + 1
Correct.
Python
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
{{'name':59, 'status' 72}}
{{'name':59, 'status':72}}
Colon missing.
Python
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
y > 8 & x < 59
y > 8 and x < 59
Use 'and' not '&'.
Python
'world' + 94
'world' + str(94)
Can't add int to string.
Python
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
var x = 13;
var x = 13;
Correct.
Dart
function baz() {{ return {{key:'hello'}} }}
function baz() {{ return {{key:'hello'}}; }}
Return object on same line.
JavaScript
print 'value'
print('value')
print needs parentheses.
Python
x := 98
x := 98
Correct.
Go
if x = 77 then print('test') end
if x == 77 then print('test') end
Use ==.
Lua
int[] data = new int[16]; data[16] = 5;
int[] data = new int[16]; if (16 < data.length) data[16] = 5;
Check bounds.
Java
String count = 'value';
String count = "value";
Double quotes.
Java
if (bar = 7)
if (bar == 7)
Use ==.
C++
SELECT id status FROM orders;
SELECT id, status FROM orders;
Add comma.
SQL