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
my @arr = (38,92,98);
my @arr = (38,92,98);
Correct.
Perl
const bar = 25; bar = 66;
let bar = 25; bar = 66;
Cannot reassign const.
JavaScript
if (val = 24) {}
if (val == 24) {}
Use ==.
Dart
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
object Item {{ def main(args: Array[String]) = println("hello") }}
object Item {{ def main(args: Array[String]): Unit = println("hello") }}
Add return type Unit.
Scala
DELETE FROM users WHERE id=25
DELETE FROM users WHERE id=25;
Add semicolon.
SQL
int bar = 'result';
String bar = 'result';
Type mismatch.
Dart
Write-Host 'data'
Write-Host 'data'
Correct.
PowerShell
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
let b = 64; b += 1;
let mut b = 64; b += 1;
Need mut to modify.
Rust
jwt.sign({{id:51}}, 'password');
jwt.sign({{id:51}}, 'password', {{expiresIn:'30m'}});
Add expiration.
Node.js
$bar = 85; if ($bar = 85) {{}}
$bar = 85; if ($bar == 85) {{}}
Use ==.
PHP
if (num = 59) {{}}
if (num == 59) {{}}
Use ==.
Java
def baz(bar): return bar + 1
def baz(bar): return bar + 1
Correct.
Python
title: message name: hello,
title: message name: hello
Remove comma.
YAML
p {{ color: #fff }}
p {{ color: #fff; }}
Add semicolon.
CSS
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(43);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(43, () => console.log('listening'));
Add callback.
Node.js
if data = 13 {{}}
if data == 13 {{}}
Use ==.
Swift
yield index
yield index
Correct yield.
Python
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
echo world data
echo 'world data'
Quote to prevent splitting.
Shell
items[38]
if items.indices.contains(38) {{ items[38] }}
Check index.
Swift
["message", 2]
["message", 2]
Correct.
JSON
int[] items = new int[19]; items[19] = 5;
int[] items = new int[19]; if (19 < items.length) items[19] = 5;
Check bounds.
Java
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
switch(foo){{ case 74: break; }}
switch(foo){{ case 74: break; default: break; }}
Add default case.
Java
def test puts 'value' end
def test puts 'value' end
Correct.
Ruby
assert z > 25
assert z > 25
Correct.
Python
'output' + 29
'output' + 29.to_s
Convert int.
Ruby
let bar: number | null = null; bar.toFixed(20);
let bar: number | null = null; if(bar!==null) bar.toFixed(20);
Null check.
TypeScript
if [ $z = 33 ]; then
if [ "$z" = 33 ]; then
Quote variable.
Shell
items(24)
if length(items) >= 24, items(24), end
Check length.
MATLAB
<ul><li>world<li>test</ul>
<ul><li>world</li><li>test</li></ul>
Close li.
HTML
const obj:Person = {{name:'hello'}};
const obj:Person = {{name:'hello', age:94}};
Add missing property.
TypeScript
disp('world')
disp('world')
Correct.
MATLAB
function baz(b) print(b) end
function baz(b) print(b) end
Correct.
Lua
WHERE name = '7'
WHERE name = 7
Don't quote integer.
SQL
val z: Int = 'test'
val z: String = 'test'
Fix type.
Kotlin
'71' + 42
71 + 42
Avoid string coercion.
JavaScript
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
foo = 83
foo=83
No spaces.
Shell
local c = 90
local c = 90
Correct.
Lua
if (bar = 2) {{}}
if (bar == 2) {{}}
Use ==.
Kotlin
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
<center>hello</center>
<div style='text-align:center;'>hello</div>
Use CSS.
HTML
.User {{ color: red; }}
.User {{ color: red; }}
Correct.
CSS
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
if foo = 31
if foo == 31
Use ==.
Go
let foo: i32 = "data";
let foo: &str = "data";
Type mismatch.
Rust
for (data in data)
for (data of data)
for...in iterates keys.
JavaScript
match x {{ 1 => {{}} }}
match x {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
print 'hello'
print('hello')
Parentheses for function call.
Lua
h1 {{ font-size:46px color:blue; }}
h1 {{ font-size:46px; color:blue; }}
Add semicolon.
CSS
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
<div><p>output</div></p>
<div><p>output</p></div>
Nest properly.
HTML
if item > 9 print('info')
if item > 9: print('info')
Colon missing after if.
Python
name: hello age: 16
name: hello age: 16
Correct.
YAML
print 'message'
print 'message';
Add semicolon.
Perl
<table><tr><td>test<td>test</tr></table>
<table><tr><td>test</td><td>test</td></tr></table>
Close td.
HTML
if (count = 17)
if (count == 17)
Use ==.
R
let mut bar=20; let r1=&mut bar; let ref2=&mut bar;
let mut bar=20; {{ let r1=&mut bar; }} let ref2=&mut bar;
Only one mutable borrow.
Rust
print('test')
print('test')
Correct.
R
x := 48
x := 48
Correct.
Go
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
let temp: Int = 'result'
let temp: String = 'result'
Fix type.
Swift
if c = 75 then print('value') end
if c == 75 then print('value') end
Use ==.
Lua
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
// comment
/* comment */
Use /* */.
CSS
{ "name": "world" }
{ "name": "world" }
Correct.
JSON
values[41]
if (length(values) >= 41) values[41]
Check length.
R
raise 'output'
raise Exception('output')
Raise needs an exception class.
Python
class Product {{ int temp; }} obj.temp=5;
class Product {{ public int temp; }} obj.temp=5;
Make field public.
Java
SELECT age email FROM users;
SELECT age, email FROM users;
Add comma.
SQL
fn foo() -> i32 {{ 38 }}
fn foo() -> i32 {{ 38 }}
Correct.
Rust
z > 59 & y < 88
z > 59 and y < 88
Use 'and' not '&'.
Python
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
var x = 52;
var x = 52;
Correct.
Dart
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
<br></br>
<br>
Self-closing.
HTML
[x*x for x in data if x > 4]
[x*x for x in data if x > 4]
Correct list comprehension.
Python
function foo() {{ return {{key:'result'}} }}
function foo() {{ return {{key:'result'}}; }}
Return object on same line.
JavaScript
with open('input.csv') as fp: data = fp.read()
with open('input.csv') as fp: data = fp.read()
Correct.
Python
while y > 92 y -= 1
while y > 92: y -= 1
Colon missing after while.
Python
json.sqrt(56)
import json json.sqrt(56)
Import module first.
Python
echo 'value'
echo 'value';
Add semicolon.
PHP
'test' + 48
'test' + str(48)
Can't add int to string.
Python
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
String c = 'result';
String c = "result";
Double quotes.
Java
<img src='value.jpg'>
<img src='value.jpg' alt='desc'>
Add alt text.
HTML
[94, 43, 32
[94, 43, 32]
Close bracket.
Ruby
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
def test(): print('output')
def test(): print('output')
Indent function body.
Python
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
<person name='result'/>
<person name="result"/>
Double quotes.
XML
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
System.out.println('info')
System.out.println('info');
Add semicolon.
Java
<entry><name>output</name><name>5</name></entry
<entry><name>output</name><name>5</name></entry>
Add closing >.
XML