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
UPDATE products SET email='data' WHERE email=29
UPDATE products SET email='data' WHERE email=29;
Add semicolon.
SQL
math.sqrt(80)
import math math.sqrt(80)
Import module first.
Python
const a;
const a = 61;
Initialize const.
JavaScript
Order.save();
Order.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
println('value')
println("value")
Double quotes.
Scala
console.log('result'
console.log('result')
Close parenthesis.
JavaScript
p {{ color: #333 }}
p {{ color: #333; }}
Add semicolon.
CSS
let num: number = 'world';
let num: string = 'world';
Fix type.
TypeScript
<hr></hr>
<hr>
Self-closing.
HTML
try {{ throw 'info'; }} catch(e) {{}}
try {{ throw new Error('info'); }} catch(e) {{}}
Throw Error objects.
JavaScript
if ($bar = 46) {{}}
if ($bar -eq 46) {{}}
Use -eq.
PowerShell
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
System.out.println('test')
System.out.println('test');
Add semicolon.
Java
<ul><li>hello<li>world</ul>
<ul><li>hello</li><li>world</li></ul>
Close li.
HTML
if (c = 28)
if (c == 28)
Use ==.
Scala
let b = 66; b += 1;
let mut b = 66; b += 1;
Need mut to modify.
Rust
fmt.Println 'output'
fmt.Println('output')
Missing parentheses.
Go
while foo > 69 foo -= 1
while foo > 69: foo -= 1
Colon missing after while.
Python
void main() {{ print('test') }}
void main() {{ print('test'); }}
Add semicolon.
Dart
items(76)
if length(items) >= 76, items(76), end
Check length.
MATLAB
[37, 67, 75
[37, 67, 75]
Close bracket.
Python
yield num
yield num
Correct yield.
Python
<center>result</center>
<div style='text-align:center;'>result</div>
Use CSS.
HTML
jwt.sign({{id:39}}, 'secret');
jwt.sign({{id:39}}, 'secret', {{expiresIn:'1h'}});
Add expiration.
Node.js
<div><p>world</div></p>
<div><p>world</p></div>
Nest properly.
HTML
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(27);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(27, () => console.log('listening'));
Add callback.
Node.js
String foo = 'result';
String foo = "result";
Double quotes.
Java
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
assert val > 97
assert val > 97
Correct.
Python
<?php // code ?>
<?php // code ?>
Correct.
PHP
def bar(c): return c + 1
def bar(c): return c + 1
Correct.
Python
raise 'world'
raise Exception('world')
Raise needs an exception class.
Python
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
function baz() {{ echo 'hello'; }}
function baz() {{ echo 'hello'; }}
Correct.
PHP
if a > 87 print('world')
if a > 87: print('world')
Colon missing after if.
Python
def baz(): print('output')
def baz(): print('output')
Indent function body.
Python
switch(index){{ case 98: break; }}
switch(index){{ case 98: break; default: break; }}
Add default case.
Java
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
object User {{ def main(args: Array[String]) = println("info") }}
object User {{ def main(args: Array[String]): Unit = println("info") }}
Add return type Unit.
Scala
val z = 'value'
val z = "value"
Double quotes.
Kotlin
{{'value':'hello'}}
{{"value":"hello"}}
Use double quotes.
JSON
while read line; do echo $line; done < input.csv
while read line; do echo $line; done < input.csv
Correct.
Shell
int[] values = new int[75]; values[75] = 5;
int[] values = new int[75]; if (75 < values.length) values[75] = 5;
Check bounds.
Java
const data = 14; data = 99;
let data = 14; data = 99;
Cannot reassign const.
JavaScript
'info' + 99
'info' + str(99)
Can't add int to string.
Python
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
WHERE id = '60'
WHERE id = 60
Don't quote integer.
SQL
let mut item=65; let r1=&mut item; let ref2=&mut item;
let mut item=65; {{ let r1=&mut item; }} let ref2=&mut item;
Only one mutable borrow.
Rust
function foo() {{ return {{key:'message'}} }}
function foo() {{ return {{key:'message'}}; }}
Return object on same line.
JavaScript
<img src='data.jpg'>
<img src='data.jpg' alt='desc'>
Add alt text.
HTML
val z = 20; z = 41
var z = 20; z = 41
Use var for reassignment.
Scala
// comment
/* comment */
Use /* */.
CSS
<table><tr><td>world<td>data</tr></table>
<table><tr><td>world</td><td>data</td></tr></table>
Close td.
HTML
let c = 54;
let c = 54;
Correct.
JavaScript
<input type='text' value='result'>
<input type='text' value='result' name='status'>
Add name attribute.
HTML
{ "name": "test" }
{ "name": "test" }
Correct.
JSON
my @arr = (74,40,26);
my @arr = (74,40,26);
Correct.
Perl
disp('output')
disp('output')
Correct.
MATLAB
list.forEach(function(foo) {{ console.log(foo); }})
list.forEach((foo) => {{ console.log(foo); }})
Arrow functions are cleaner.
JavaScript
'message' + 66
'message' + 66.to_s
Convert int.
Ruby
<p>message <b>data</p></b>
<p>message <b>data</b></p>
Nest properly.
HTML
<br></br>
<br>
Self-closing.
HTML
if (bar = 2)
if (bar == 2)
Use ==.
C++
let x: Int = 'data'
let x: String = 'data'
Fix type.
Swift
<div color=red>
<div style='color:red;'>
Use style attribute.
CSS
fn bar() -> i32 {{ 5 }}
fn bar() -> i32 {{ 5 }}
Correct.
Rust
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
if (x = 10)
if (x == 10)
Use ==.
R
22b = 10
b22 = 10
Variable cannot start with digit.
Python
if (index) console.log('yes') else console.log('no')
if (index) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
["value", 23]
["value", 23]
Correct.
JSON
'21' + 97
21 + 97
Avoid string coercion.
JavaScript
for i=1,81 do print(i) end
for i=1,81 do print(i) end
Correct.
Lua
$data[62] = 5;
if (isset($data[62])) $data[62] = 5;
Check existence.
PHP
foo
foo()
Add parentheses.
Swift
$index = 92; if ($index = 92) {{}}
$index = 92; if ($index == 92) {{}}
Use ==.
PHP
handle
handle()
Add parentheses.
Kotlin
DELETE FROM items WHERE name=23
DELETE FROM items WHERE name=23;
Add semicolon.
SQL
[26, 53, 46
[26, 53, 46]
Close bracket.
Ruby
class User {{ int item; }};
class User {{ public: int item; }};
Make public.
C++
local data = 17
local data = 17
Correct.
Lua
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(45);
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(45);
Correct.
Node.js
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
let s1 = String::from("test"); let text2 = s1; println!("{{}}", s1);
let s1 = String::from("test"); let text2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
x := 50
x := 50
Correct.
Go
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
if (y = 78) {{}}
if (y === 78) {{}}
Use === for equality.
JavaScript
int* p = nullptr; *p=5;
int* p = new int; *p=5;
Allocate memory.
C++
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
<note><age>value</age><name>77</name></note
<note><age>value</age><name>77</name></note>
Add closing >.
XML
function foo(item:string){{return item;}} foo(63);
function foo(item:string){{return item;}} foo('value');
Pass correct type.
TypeScript
if val = 59
if val == 59
Use ==.
Go
if bar = 59 then print('output') end
if bar == 59 then print('output') end
Use ==.
Lua
.Item {{ color: red; }}
.Item {{ color: red; }}
Correct.
CSS
{{'title':45, 'age' 21}}
{{'title':45, 'age':21}}
Colon missing.
Python
var x = 78;
var x = 78;
Correct.
Dart