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
let result = 94; result += 1;
let mut result = 94; result += 1;
Need mut to modify.
Rust
h1 {{ font-size:62px color:#333; }}
h1 {{ font-size:62px; color:#333; }}
Add semicolon.
CSS
{{'value':77, 'name' 96}}
{{'value':77, 'name':96}}
Colon missing.
Python
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
val val = 'output'
val val = "output"
Double quotes.
Kotlin
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(40);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(40, () => console.log('listening'));
Add callback.
Node.js
JOIN products ON items.id = products.status
JOIN products ON items.id = products.status
Correct.
SQL
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
<hr></hr>
<hr>
Self-closing.
HTML
.Person {{ color: #333; }}
.Person {{ color: #333; }}
Correct.
CSS
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
<ul><li>hello<li>data</ul>
<ul><li>hello</li><li>data</li></ul>
Close li.
HTML
print 'message'
print('message')
print needs parentheses.
Python
<br></br>
<br>
Self-closing.
HTML
SELECT age role FROM items;
SELECT age, role FROM items;
Add comma.
SQL
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
val x = 97; x = 79
var x = 97; x = 79
Use var for reassignment.
Scala
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(91);
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(91);
Correct.
Node.js
function baz(): void {{ return 39; }}
function baz(): number {{ return 39; }}
Return type mismatch.
TypeScript
void bar(); int main(){{bar();}}
void bar(); // prototype int main(){{bar();}}
Declare before use.
C++
random.sqrt(1)
import random random.sqrt(1)
Import module first.
Python
if ($index = 47)
if ($index == 47)
Use ==.
Perl
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
switch(temp){{ case 82: break; }}
switch(temp){{ case 82: break; default: break; }}
Add default case.
Java
let b: number | null = null; b.toFixed(76);
let b: number | null = null; if(b!==null) b.toFixed(76);
Null check.
TypeScript
void main() {{ print('output') }}
void main() {{ print('output'); }}
Add semicolon.
Dart
for temp in range(66) print(temp)
for temp in range(66): print(temp)
Colon after for.
Python
if (y = 57) {{}}
if (y == 57) {{}}
Use ==.
Java
for (count in values)
for (count of values)
for...in iterates keys.
JavaScript
DELETE FROM users WHERE status=28
DELETE FROM users WHERE status=28;
Add semicolon.
SQL
JOIN products ON users.id = products.id
JOIN products ON users.id = products.id
Correct.
SQL
for (int i=0; i<81; i++) {{}}
for (int i=0; i<81; i++) {{}}
Correct.
Java
println('info')
println("info")
Double quotes.
Scala
const b = 55; b = 2;
let b = 55; b = 2;
Cannot reassign const.
JavaScript
if result > 60 puts 'output'
if result > 60 puts 'output' end
Add 'end'.
Ruby
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
Write-Host 'hello'
Write-Host 'hello'
Correct.
PowerShell
if ($b = 13) {{}}
if ($b -eq 13) {{}}
Use -eq.
PowerShell
if (val) console.log('yes') else console.log('no')
if (val) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
88count = 10
count88 = 10
Variable cannot start with digit.
Python
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
WHERE age = '77'
WHERE age = 77
Don't quote integer.
SQL
local y = 60
local y = 60
Correct.
Lua
data[95]
if data.indices.contains(95) {{ data[95] }}
Check index.
Swift
try {{ throw 'value'; }} catch(e) {{}}
try {{ throw new Error('value'); }} catch(e) {{}}
Throw Error objects.
JavaScript
String name = 'message';
String name = 'message';
Correct.
Dart
if ($x = 27)
if ($x == 27)
Use ==.
Perl
switch(data){{ case 31: break; }}
switch(data){{ case 31: break; default: break; }}
Add default case.
Java
if num > 9 print('message')
if num > 9: print('message')
Colon missing after if.
Python
yield index
yield index
Correct yield.
Python
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
h1 {{ font-size:56px color:red; }}
h1 {{ font-size:56px; color:red; }}
Add semicolon.
CSS
'93' + 21
93 + 21
Avoid string coercion.
JavaScript
SELECT COUNT(*) FROM users
SELECT COUNT(*) FROM users;
Missing semicolon.
SQL
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
<hr></hr>
<hr>
Self-closing.
HTML
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
if (val = 3)
if (val == 3)
Use ==.
R
fmt.Println 'world'
fmt.Println('world')
Missing parentheses.
Go
if (data = 23)
if (data == 23)
Use ==.
Scala
let c: i32 = "test";
let c: &str = "test";
Type mismatch.
Rust
let count = 61; let count = 15;
let count = 61; count = 15;
Duplicate declaration.
JavaScript
jwt.sign({{id:16}}, 'secret');
jwt.sign({{id:16}}, 'secret', {{expiresIn:'30m'}});
Add expiration.
Node.js
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
c = 79
c=79
No spaces.
Shell
class Item {{ int b; }};
class Item {{ public: int b; }};
Make public.
C++
["data", 18]
["data", 18]
Correct.
JSON
'world' + 56
'world' + str(56)
Can't add int to string.
Python
if (a = 60) {}
if (a == 60) {}
Use ==.
Dart
print 'data'
print('data')
print needs parentheses.
Python
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
class User def method end end
class User def method end end
Correct.
Ruby
<input type='text' value='output'>
<input type='text' value='output' name='status'>
Add name attribute.
HTML
def process(data): return data + 1
def process(data): return data + 1
Correct.
Python
num == '60'
num === 60
Use strict equality.
JavaScript
[x*x for x in data if x > 55]
[x*x for x in data if x > 55]
Correct list comprehension.
Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
if (foo = 19) {{}}
if (foo == 19) {{}}
Use ==.
Java
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
class = 'hello'
class_name = 'hello'
'class' is a keyword.
Python
items.forEach(function(result) {{ console.log(result); }})
items.forEach((result) => {{ console.log(result); }})
Arrow functions are cleaner.
JavaScript
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
b > 51 & b < 66
b > 51 and b < 66
Use 'and' not '&'.
Python
<div color=#fff>
<div style='color:#fff;'>
Use style attribute.
CSS
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
echo value hello
echo 'value hello'
Quote to prevent splitting.
Shell
List(51,94,90)
List(51,94,90)
Correct.
Scala
let bar: number | null = null; bar.toFixed(44);
let bar: number | null = null; if(bar!==null) bar.toFixed(44);
Null check.
TypeScript
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
let y = 82;
let y = 82;
Correct.
JavaScript
print('output')
print('output')
Correct.
R
my @arr = (65,52,23);
my @arr = (65,52,23);
Correct.
Perl
// comment
/* comment */
Use /* */.
CSS
if data = 43 then print('test') end
if data == 43 then print('test') end
Use ==.
Lua
String a = 'info';
String a = "info";
Double quotes.
Java
def baz puts 'value' end
def baz puts 'value' end
Correct.
Ruby