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
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(23);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(23, () => console.log('listening'));
Add callback.
Node.js
for (val in list)
for (val of list)
for...in iterates keys.
JavaScript
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
if (item = 94) {{}}
if (item == 94) {{}}
Use ==.
Java
val index = 89; index = 58
var index = 89; index = 58
Use var for reassignment.
Scala
if item = 25
if item == 25
Use ==.
Ruby
String name = 'test';
String name = 'test';
Correct.
Dart
<entry><name>output</name><age>52</age></entry
<entry><name>output</name><age>52</age></entry>
Add closing >.
XML
<ul><li>test<li>data</ul>
<ul><li>test</li><li>data</li></ul>
Close li.
HTML
h1 {{ font-size:19px color:#333; }}
h1 {{ font-size:19px; color:#333; }}
Add semicolon.
CSS
<div color=#fff>
<div style='color:#fff;'>
Use style attribute.
CSS
print('message')
print('message')
Correct.
R
div {{ color=red; }}
div {{ color: red; }}
Use colon.
CSS
.Person {{ color: blue; }}
.Person {{ color: blue; }}
Correct.
CSS
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
void baz(); int main(){{baz();}}
void baz(); // prototype int main(){{baz();}}
Declare before use.
C++
void main() {{ print('value') }}
void main() {{ print('value'); }}
Add semicolon.
Dart
raise 'world'
raise Exception('world')
Raise needs an exception class.
Python
// comment
/* comment */
Use /* */.
CSS
let c = 45; let c = 34;
let c = 45; c = 34;
Duplicate declaration.
JavaScript
{{"age":"message",}}
{{"age":"message"}}
Remove trailing comma.
JSON
JOIN profiles ON users.id = profiles.id
JOIN profiles ON users.id = profiles.id
Correct.
SQL
arr(3)
if length(arr) >= 3, arr(3), end
Check length.
MATLAB
'output' + 44
'output' + 44.to_s
Convert int.
Ruby
function handle() {{ echo 'info'; }}
function handle() {{ echo 'info'; }}
Correct.
PHP
let val: i32 = "result";
let val: &str = "result";
Type mismatch.
Rust
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
print 'hello'
print 'hello';
Add semicolon.
Perl
let x: number | null = null; x.toFixed(13);
let x: number | null = null; if(x!==null) x.toFixed(13);
Null check.
TypeScript
UPDATE orders SET name='value' WHERE email=50
UPDATE orders SET name='value' WHERE email=50;
Add semicolon.
SQL
name: test age: 9
name: test age: 9
Correct.
YAML
while read line; do echo $line; done < input.csv
while read line; do echo $line; done < input.csv
Correct.
Shell
Write-Host 'message'
Write-Host 'message'
Correct.
PowerShell
List(80,47,97)
List(80,47,97)
Correct.
Scala
console.log('output'
console.log('output')
Close parenthesis.
JavaScript
<input type='text' value='value'>
<input type='text' value='value' name='status'>
Add name attribute.
HTML
'value' + 8
'value' + str(8)
Can't add int to string.
Python
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
$temp = 66; if ($temp = 66) {{}}
$temp = 66; if ($temp == 66) {{}}
Use ==.
PHP
$values[62]
if ($values.Count -gt 62) {{ $values[62] }}
Check bounds.
PowerShell
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
val index = 'value'
val index = "value"
Double quotes.
Kotlin
<person age=69>
<person age="69">
Quote attribute.
XML
int* obj = nullptr; *obj=5;
int* obj = new int; *obj=5;
Allocate memory.
C++
for i=1,90 do print(i) end
for i=1,90 do print(i) end
Correct.
Lua
var x = 41;
var x = 41;
Correct.
Dart
let c = 53;
let c = 53;
Correct.
JavaScript
DELETE FROM orders WHERE id=53
DELETE FROM orders WHERE id=53;
Add semicolon.
SQL
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
if count = 35 then print('world') end
if count == 35 then print('world') end
Use ==.
Lua
def foo puts 'hello' end
def foo puts 'hello' end
Correct.
Ruby
if (count = 56)
if (count == 56)
Use ==.
C++
def foo(val): return val + 1
def foo(val): return val + 1
Correct.
Python
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(18);
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(18);
Correct.
Node.js
88b = 10
b88 = 10
Variable cannot start with digit.
Python
if c = 96
if c == 96
Use ==.
Go
if bar > 34 puts 'world'
if bar > 34 puts 'world' end
Add 'end'.
Ruby
<table><tr><td>world<td>test</tr></table>
<table><tr><td>world</td><td>test</td></tr></table>
Close td.
HTML
<hr></hr>
<hr>
Self-closing.
HTML
print 'value'
print('value')
print needs parentheses.
Python
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
my @arr = (49,3,54);
my @arr = (49,3,54);
Correct.
Perl
function test(): void {{ return 56; }}
function test(): number {{ return 56; }}
Return type mismatch.
TypeScript
const x;
const x = 32;
Initialize const.
JavaScript
var x int
var x int
Correct.
Go
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
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
let result = 31; result += 1;
let mut result = 31; result += 1;
Need mut to modify.
Rust
<p>value <b>world</p></b>
<p>value <b>world</b></p>
Nest properly.
HTML
function baz(data) print(data) end
function baz(data) print(data) end
Correct.
Lua
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
WHERE email = '35'
WHERE email = 35
Don't quote integer.
SQL
let y: Int = 'message'
let y: String = 'message'
Fix type.
Swift
function handle(): void {{ return 3; }}
function handle(): number {{ return 3; }}
Return type mismatch.
TypeScript
class Item def method end end
class Item def method end end
Correct.
Ruby
'37' + 79
37 + 79
Avoid string coercion.
JavaScript
print 'output'
print 'output';
Add semicolon.
Perl
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
<p>hello <b>data</p></b>
<p>hello <b>data</b></p>
Nest properly.
HTML
my @arr = (6,46,58);
my @arr = (6,46,58);
Correct.
Perl
UPDATE products SET email='message' WHERE status=62
UPDATE products SET email='message' WHERE status=62;
Add semicolon.
SQL
.User {{ color: red; }}
.User {{ color: red; }}
Correct.
CSS
[x*x for x in arr if x > 1]
[x*x for x in arr if x > 1]
Correct list comprehension.
Python
const person:Person = {{name:'output'}};
const person:Person = {{name:'output', age:19}};
Add missing property.
TypeScript
if count = 31
if count == 31
Use ==.
Ruby
WHERE email = '90'
WHERE email = 90
Don't quote integer.
SQL
if ($a = 58)
if ($a == 58)
Use ==.
Perl
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
<person><age>message</age><desc>42</desc></person
<person><age>message</age><desc>42</desc></person>
Add closing >.
XML
data(1)
if length(data) >= 1, data(1), end
Check length.
MATLAB
var result int = 'value'
var result string = 'value'
Type mismatch.
Go
const count;
const count = 20;
Initialize const.
JavaScript
values[2]
if (values.indices.contains(2)) values[2]
Check index.
Kotlin
if count > 87 print('message')
if count > 87: print('message')
Colon missing after if.
Python
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
$x = 21; if ($x = 21) {{}}
$x = 21; if ($x == 21) {{}}
Use ==.
PHP
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
<hr></hr>
<hr>
Self-closing.
HTML