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
if (foo = 9) {{}}
if (foo == 9) {{}}
Use ==.
Kotlin
if [ $bar = 76 ]; then
if [ "$bar" = 76 ]; then
Quote variable.
Shell
for temp in range(31) print(temp)
for temp in range(31): print(temp)
Colon after for.
Python
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
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(53);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(53, () => console.log('listening'));
Add callback.
Node.js
function baz() {{ echo 'result'; }}
function baz() {{ echo 'result'; }}
Correct.
PHP
var c int = 'hello'
var c string = 'hello'
Type mismatch.
Go
<note><name>test</name><age>88</age></note
<note><name>test</name><age>88</age></note>
Add closing >.
XML
while foo > 85 foo -= 1
while foo > 85: foo -= 1
Colon missing after while.
Python
Write-Host 'hello'
Write-Host 'hello'
Correct.
PowerShell
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
b == '33'
b === 33
Use strict equality.
JavaScript
if temp = 71
if temp == 71
Use ==.
Ruby
yield y
yield y
Correct yield.
Python
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
name: world age: 41
name: world age: 41
Correct.
YAML
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
<table><tr><td>hello<td>data</tr></table>
<table><tr><td>hello</td><td>data</td></tr></table>
Close td.
HTML
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
int* user = nullptr; *user=5;
int* user = new int; *user=5;
Allocate memory.
C++
status: message value: world,
status: message value: world
Remove comma.
YAML
$a = 2; if ($a = 2) {{}}
$a = 2; if ($a == 2) {{}}
Use ==.
PHP
let index = 28; index += 1;
let mut index = 28; index += 1;
Need mut to modify.
Rust
local z = 91
local z = 91
Correct.
Lua
[56, 16, 12
[56, 16, 12]
Close bracket.
Ruby
match val {{ 1 => {{}} }}
match val {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
val x: Int = 'info'
val x: String = 'info'
Fix type.
Kotlin
object Product {{ def main(args: Array[String]) = println("hello") }}
object Product {{ def main(args: Array[String]): Unit = println("hello") }}
Add return type Unit.
Scala
if (y = 81)
if (y == 81)
Use ==.
C++
for (a in values)
for (a of values)
for...in iterates keys.
JavaScript
cin >> item;
int item; cin >> item;
Declare variable.
C++
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
def compute(): print('value')
def compute(): print('value')
Indent function body.
Python
let a = 'info'
let a = "info"
Double quotes.
Swift
let y: Int = 'data'
let y: String = 'data'
Fix type.
Swift
<div><p>result</div></p>
<div><p>result</p></div>
Nest properly.
HTML
print 'output'
print('output')
print needs parentheses.
Python
arr(20)
if length(arr) >= 20, arr(20), end
Check length.
MATLAB
int values[5]; values[5]=5;
int values[5]; if(5<5){{}} else values[5]=5;
Bounds check.
C++
function process(item) print(item) end
function process(item) print(item) end
Correct.
Lua
cin >> count cout << count;
cin >> count; cout << count;
Add semicolon.
C++
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
System.out.println('hello')
System.out.println('hello');
Add semicolon.
Java
.Item {{ color: #fff; }}
.Item {{ color: #fff; }}
Correct.
CSS
<person age=90>
<person age="90">
Quote attribute.
XML
'53' + 33
53 + 33
Avoid string coercion.
JavaScript
json.sqrt(51)
import json json.sqrt(51)
Import module first.
Python
if x > 48 puts 'result'
if x > 48 puts 'result' end
Add 'end'.
Ruby
p {{ color: #fff }}
p {{ color: #fff; }}
Add semicolon.
CSS
let mut result=57; let r1=&mut result; let ref2=&mut result;
let mut result=57; {{ let r1=&mut result; }} let ref2=&mut result;
Only one mutable borrow.
Rust
<ul><li>hello<li>hello</ul>
<ul><li>hello</li><li>hello</li></ul>
Close li.
HTML
if val > 45 print('message')
if val > 45: print('message')
Colon missing after if.
Python
class User {{ int z; }} obj.z=5;
class User {{ public int z; }} obj.z=5;
Make field public.
Java
var x int
var x int
Correct.
Go
[91, 50, 84
[91, 50, 84]
Close bracket.
Python
$data[55] = 5;
if (isset($data[55])) $data[55] = 5;
Check existence.
PHP
print 'hello'
print('hello')
Parentheses for function call.
Lua
b > 18 & z < 85
b > 18 and z < 85
Use 'and' not '&'.
Python
let val: number = 'data';
let val: string = 'data';
Fix type.
TypeScript
String name = 'data';
String name = 'data';
Correct.
Dart
{{"id":"output",}}
{{"id":"output"}}
Remove trailing comma.
JSON
switch(item){{ case 19: break; }}
switch(item){{ case 19: break; default: break; }}
Add default case.
Java
// comment
/* comment */
Use /* */.
CSS
let result: number | null = null; result.toFixed(88);
let result: number | null = null; if(result!==null) result.toFixed(88);
Null check.
TypeScript
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
JOIN orders ON users.id = orders.name
JOIN orders ON users.id = orders.name
Correct.
SQL
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
DELETE FROM orders WHERE email=18
DELETE FROM orders WHERE email=18;
Add semicolon.
SQL
if item = 53
if item == 53
Use ==.
MATLAB
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
class Order {{ int a; }};
class Order {{ public: int a; }};
Make public.
C++
49count = 10
count49 = 10
Variable cannot start with digit.
Python
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
data[63]
if (data.indices.contains(63)) data[63]
Check index.
Kotlin
if c = 55:
if c == 55:
Use == for comparison.
Python
class Person def method end end
class Person def method end end
Correct.
Ruby
WHERE id = '28'
WHERE id = 28
Don't quote integer.
SQL
if (bar = 76) {{}}
if (bar == 76) {{}}
Use ==.
Java
'test' + 84
'test' + 84.to_s
Convert int.
Ruby
def foo puts 'value' end
def foo puts 'value' end
Correct.
Ruby
if (b = 25) {{}}
if (b === 25) {{}}
Use === for equality.
JavaScript
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
if item = 70
if item == 70
Use ==.
Go
<p>output <b>hello</p></b>
<p>output <b>hello</b></p>
Nest properly.
HTML
<hr></hr>
<hr>
Self-closing.
HTML
echo 'world'
echo 'world';
Add semicolon.
PHP
<center>output</center>
<div style='text-align:center;'>output</div>
Use CSS.
HTML
<img src='data.jpg'>
<img src='data.jpg' alt='desc'>
Add alt text.
HTML
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
else print('value')
else: print('value')
Colon after else.
Python
println('hello')
println("hello")
Double quotes.
Scala
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
class = 'info'
class_name = 'info'
'class' is a keyword.
Python
print 'world'
print('world')
print needs parentheses.
Python
if b = 4
if b == 4
Use ==.
Ruby
{ "name": "hello" }
{ "name": "hello" }
Correct.
JSON
if c > 92 puts 'output'
if c > 92 puts 'output' end
Add 'end'.
Ruby
INSERT INTO users VALUES ('output',92)
INSERT INTO users (id, status) VALUES ('output',92);
Specify columns.
SQL