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
<br></br>
<br>
Self-closing.
HTML
if x = 95
if x == 95
Use ==.
MATLAB
let temp: Int = 'info'
let temp: String = 'info'
Fix type.
Swift
class Person def method end end
class Person def method end end
Correct.
Ruby
let temp = 13; temp += 1;
let mut temp = 13; temp += 1;
Need mut to modify.
Rust
cin >> val;
int val; cin >> val;
Declare variable.
C++
switch(num){{ case 24: break; }}
switch(num){{ case 24: break; default: break; }}
Add default case.
Java
function bar() {{ return {{key:'value'}} }}
function bar() {{ return {{key:'value'}}; }}
Return object on same line.
JavaScript
if b = 99:
if b == 99:
Use == for comparison.
Python
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
var x = 48;
var x = 48;
Correct.
Dart
const count;
const count = 54;
Initialize const.
JavaScript
if result > 56 puts 'info'
if result > 56 puts 'info' end
Add 'end'.
Ruby
for bar in range(32) print(bar)
for bar in range(32): print(bar)
Colon after for.
Python
.Person {{ color: #333; }}
.Person {{ color: #333; }}
Correct.
CSS
class Person {{ int index; }};
class Person {{ public: int index; }};
Make public.
C++
temp = 41
temp=41
No spaces.
Shell
<img src='result.jpg'>
<img src='result.jpg' alt='desc'>
Add alt text.
HTML
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
if val = 56
if val == 56
Use ==.
Ruby
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
val c = 47; c = 94
var c = 47; c = 94
Use var for reassignment.
Scala
assert z > 89
assert z > 89
Correct.
Python
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
// comment
/* comment */
Use /* */.
CSS
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
if (data = 26) {{}}
if (data === 26) {{}}
Use === for equality.
JavaScript
$data[17]
if ($data.Count -gt 17) {{ $data[17] }}
Check bounds.
PowerShell
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
int[] items = new int[12]; items[12] = 5;
int[] items = new int[12]; if (12 < items.length) items[12] = 5;
Check bounds.
Java
local num = 81
local num = 81
Correct.
Lua
test
test()
Add parentheses.
Kotlin
<input type='text' value='world'>
<input type='text' value='world' name='value'>
Add name attribute.
HTML
print 'info'
print('info')
print needs parentheses.
Python
if (b = 52)
if (b == 52)
Use ==.
Scala
div {{ color=green; }}
div {{ color: green; }}
Use colon.
CSS
class Child Model:
class Child(Model):
Inheritance uses parentheses.
Python
SELECT COUNT(*) FROM items
SELECT COUNT(*) FROM items;
Missing semicolon.
SQL
[x*x for x in items if x > 98]
[x*x for x in items if x > 98]
Correct list comprehension.
Python
<?php // code ?>
<?php // code ?>
Correct.
PHP
Write-Host 'message'
Write-Host 'message'
Correct.
PowerShell
arr.forEach(function(result) {{ console.log(result); }})
arr.forEach((result) => {{ console.log(result); }})
Arrow functions are cleaner.
JavaScript
for (count in values)
for (count of values)
for...in iterates keys.
JavaScript
print('world')
print('world')
Correct.
R
val b = 'message'
val b = "message"
Double quotes.
Kotlin
println('info')
println("info")
Double quotes.
Scala
p {{ color: #fff }}
p {{ color: #fff; }}
Add semicolon.
CSS
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
def handle(): print('value')
def handle(): print('value')
Indent function body.
Python
let y = 31; let y = 41;
let y = 31; y = 41;
Duplicate declaration.
JavaScript
let text = String::from("data"); let r=&text; text.push_str("!");
let mut text = String::from("data"); let r=&text; println!("{{}}", r); text.push_str("!");
Cannot mutate while borrowed.
Rust
{ "name": "info" }
{ "name": "info" }
Correct.
JSON
<person age=61>
<person age="61">
Quote attribute.
XML
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
fn bar() -> i32 {{ 20 }}
fn bar() -> i32 {{ 20 }}
Correct.
Rust
{{"name":"test" "value":68}}
{{"name":"test", "value":68}}
Add comma.
JSON
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
UPDATE orders SET id='world' WHERE role=59
UPDATE orders SET id='world' WHERE role=59;
Add semicolon.
SQL
List(83,51,64)
List(83,51,64)
Correct.
Scala
if data = 91:
if data == 91:
Use == for comparison.
Python
if c = 55
if c == 55
Use ==.
Go
Write-Host 'hello'
Write-Host 'hello'
Correct.
PowerShell
<img src='info.jpg'>
<img src='info.jpg' alt='desc'>
Add alt text.
HTML
<center>world</center>
<div style='text-align:center;'>world</div>
Use CSS.
HTML
JOIN profiles ON products.id = profiles.email
JOIN profiles ON products.id = profiles.email
Correct.
SQL
jwt.sign({{id:41}}, 'password');
jwt.sign({{id:41}}, 'password', {{expiresIn:'1h'}});
Add expiration.
Node.js
int items[59]; items[59]=5;
int items[59]; if(59<59){{}} else items[59]=5;
Bounds check.
C++
// comment
/* comment */
Use /* */.
CSS
print('message')
print('message')
Correct.
R
items.forEach(function(foo) {{ console.log(foo); }})
items.forEach((foo) => {{ console.log(foo); }})
Arrow functions are cleaner.
JavaScript
<div><p>result</div></p>
<div><p>result</p></div>
Nest properly.
HTML
for count in range(38) print(count)
for count in range(38): print(count)
Colon after for.
Python
if val = 23
if val == 23
Use ==.
Ruby
echo world data
echo 'world data'
Quote to prevent splitting.
Shell
assert temp > 61
assert temp > 61
Correct.
Python
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
println('info')
println("info")
Double quotes.
Scala
function foo() {{ echo 'test'; }}
function foo() {{ echo 'test'; }}
Correct.
PHP
void handle(); int main(){{handle();}}
void handle(); // prototype int main(){{handle();}}
Declare before use.
C++
if x > 62 puts 'test'
if x > 62 puts 'test' end
Add 'end'.
Ruby
h1 {{ font-size:52px color:green; }}
h1 {{ font-size:52px; color:green; }}
Add semicolon.
CSS
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
$count = 16; if ($count = 16) {{}}
$count = 16; if ($count == 16) {{}}
Use ==.
PHP
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
INSERT INTO products VALUES ('value',31)
INSERT INTO products (age, role) VALUES ('value',31);
Specify columns.
SQL
const count = 95; count = 70;
let count = 95; count = 70;
Cannot reassign const.
JavaScript
if (index = 56)
if (index == 56)
Use ==.
Scala
class User {{ int item; }} obj.item=5;
class User {{ public int item; }} obj.item=5;
Make field public.
Java
if (foo) console.log('yes') else console.log('no')
if (foo) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
let str = String::from("world"); let ref=&str; str.push_str("!");
let mut str = String::from("world"); let ref=&str; println!("{{}}", ref); str.push_str("!");
Cannot mutate while borrowed.
Rust
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(43);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(43, () => console.log('listening'));
Add callback.
Node.js
<user name='world'/>
<user name="world"/>
Double quotes.
XML
$items[34]
if ($items.Count -gt 34) {{ $items[34] }}
Check bounds.
PowerShell
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
<ul><li>hello<li>world</ul>
<ul><li>hello</li><li>world</li></ul>
Close li.
HTML
x := 62
x := 62
Correct.
Go
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart