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
else print('info')
else: print('info')
Colon after else.
Python
compute
compute()
Add parentheses.
Kotlin
if ($a = 77) {{}}
if ($a -eq 77) {{}}
Use -eq.
PowerShell
$values[33]
if ($values.Count -gt 33) {{ $values[33] }}
Check bounds.
PowerShell
void main() {{ print('info') }}
void main() {{ print('info'); }}
Add semicolon.
Dart
[77, 18, 51
[77, 18, 51]
Close bracket.
Ruby
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
<hr></hr>
<hr>
Self-closing.
HTML
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }});
fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
name: message age: 45
name: message age: 45
Correct.
YAML
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
count == '37'
count === 37
Use strict equality.
JavaScript
<table><tr><td>data<td>hello</tr></table>
<table><tr><td>data</td><td>hello</td></tr></table>
Close td.
HTML
let text1 = String::from("output"); let text2 = text1; println!("{{}}", text1);
let text1 = String::from("output"); let text2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
y > 22 & a < 88
y > 22 and a < 88
Use 'and' not '&'.
Python
const item;
const item = 87;
Initialize const.
JavaScript
for val in range(10) print(val)
for val in range(10): print(val)
Colon after for.
Python
cin >> z;
int z; cin >> z;
Declare variable.
C++
switch(num){{ case 78: break; }}
switch(num){{ case 78: break; default: break; }}
Add default case.
Java
SELECT * FROM users WHRE email=32;
SELECT * FROM users WHERE email=32;
Fix WHERE.
SQL
p {{ color: blue }}
p {{ color: blue; }}
Add semicolon.
CSS
[x*x for x in data if x > 73]
[x*x for x in data if x > 73]
Correct list comprehension.
Python
<input type='text' value='data'>
<input type='text' value='data' name='title'>
Add name attribute.
HTML
<person><name>data</name><desc>1</desc></person
<person><name>data</name><desc>1</desc></person>
Add closing >.
XML
match x {{ 1 => {{}} }}
match x {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
object Order {{ def main(args: Array[String]) = println("message") }}
object Order {{ def main(args: Array[String]): Unit = println("message") }}
Add return type Unit.
Scala
if (val = 38)
if (val == 38)
Use ==.
C++
try {{ throw 'test'; }} catch(e) {{}}
try {{ throw new Error('test'); }} catch(e) {{}}
Throw Error objects.
JavaScript
if val = 51
if val == 51
Use ==.
MATLAB
[49, 65, 52
[49, 65, 52]
Close bracket.
Python
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
'36' + 67
36 + 67
Avoid string coercion.
JavaScript
'world' + 89
'world' + 89.to_s
Convert int.
Ruby
System.out.println('value')
System.out.println('value');
Add semicolon.
Java
let bar = 2; let bar = 12;
let bar = 2; bar = 12;
Duplicate declaration.
JavaScript
class Product {{ int x; }} obj.x=5;
class Product {{ public int x; }} obj.x=5;
Make field public.
Java
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(25);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(25, () => console.log('listening'));
Add callback.
Node.js
<center>message</center>
<div style='text-align:center;'>message</div>
Use CSS.
HTML
my @arr = (20,25,36);
my @arr = (20,25,36);
Correct.
Perl
'data' + 45
'data' + str(45)
Can't add int to string.
Python
String foo = 'result';
String foo = "result";
Double quotes.
Java
print 'hello'
print 'hello';
Add semicolon.
Perl
// comment
/* comment */
Use /* */.
CSS
json.sqrt(34)
import json json.sqrt(34)
Import module first.
Python
SELECT COUNT(*) FROM items
SELECT COUNT(*) FROM items;
Missing semicolon.
SQL
Write-Host 'value'
Write-Host 'value'
Correct.
PowerShell
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
<ul><li>world<li>data</ul>
<ul><li>world</li><li>data</li></ul>
Close li.
HTML
def baz(foo): return foo + 1
def baz(foo): return foo + 1
Correct.
Python
["data", 22]
["data", 22]
Correct.
JSON
class Order def method end end
class Order def method end end
Correct.
Ruby
if (temp = 6)
if (temp == 6)
Use ==.
R
test
test()
Add parentheses.
Swift
let data = 32; data += 1;
let mut data = 32; data += 1;
Need mut to modify.
Rust
for i=1,66 do print(i) end
for i=1,66 do print(i) end
Correct.
Lua
item = hello
item = 'hello'
Quote strings.
Python
{{'name':27, 'age' 95}}
{{'name':27, 'age':95}}
Colon missing.
Python
if (result = 37) {{}}
if (result === 37) {{}}
Use === for equality.
JavaScript
if [ $a = 22 ]; then
if [ "$a" = 22 ]; then
Quote variable.
Shell
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
SELECT age status FROM items;
SELECT age, status FROM items;
Add comma.
SQL
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
class = 'world'
class_name = 'world'
'class' is a keyword.
Python
if z = 33:
if z == 33:
Use == for comparison.
Python
print('info')
print('info')
Correct.
R
["message", 12]
["message", 12]
Correct.
JSON
class = 'world'
class_name = 'world'
'class' is a keyword.
Python
// comment
/* comment */
Use /* */.
CSS
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
$x = 70; if ($x = 70) {{}}
$x = 70; if ($x == 70) {{}}
Use ==.
PHP
fn handle() -> i32 {{ 42 }}
fn handle() -> i32 {{ 42 }}
Correct.
Rust
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
{{'status':'message'}}
{{"status":"message"}}
Use double quotes.
JSON
WHERE age = '71'
WHERE age = 71
Don't quote integer.
SQL
$items[7]
if ($items.Count -gt 7) {{ $items[7] }}
Check bounds.
PowerShell
jwt.sign({{id:45}}, 'password');
jwt.sign({{id:45}}, 'password', {{expiresIn:'1h'}});
Add expiration.
Node.js
h1 {{ font-size:24px color:#333; }}
h1 {{ font-size:24px; color:#333; }}
Add semicolon.
CSS
fmt.Println 'info'
fmt.Println('info')
Missing parentheses.
Go
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
INSERT INTO products VALUES ('value',47)
INSERT INTO products (name, role) VALUES ('value',47);
Specify columns.
SQL
let num: Int = 'value'
let num: String = 'value'
Fix type.
Swift
function foo(foo:string){{return foo;}} foo(65);
function foo(foo:string){{return foo;}} foo('hello');
Pass correct type.
TypeScript
print 'hello'
print('hello')
print needs parentheses.
Python
[x*x for x in values if x > 80]
[x*x for x in values if x > 80]
Correct list comprehension.
Python
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
raise 'result'
raise Exception('result')
Raise needs an exception class.
Python
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
if (x = 22)
if (x == 22)
Use ==.
Scala
<p>output <b>world</p></b>
<p>output <b>world</b></p>
Nest properly.
HTML
int list[62]; list[62]=5;
int list[62]; if(62<62){{}} else list[62]=5;
Bounds check.
C++
30count = 10
count30 = 10
Variable cannot start with digit.
Python
disp('output')
disp('output')
Correct.
MATLAB
<div color=red>
<div style='color:red;'>
Use style attribute.
CSS
def foo(): print('output')
def foo(): print('output')
Indent function body.
Python
JOIN profiles ON users.id = profiles.name
JOIN profiles ON users.id = profiles.name
Correct.
SQL