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
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
arr(80)
if length(arr) >= 80, arr(80), end
Check length.
MATLAB
h1 {{ font-size:99px color:#fff; }}
h1 {{ font-size:99px; color:#fff; }}
Add semicolon.
CSS
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
List(9,23,97)
List(9,23,97)
Correct.
Scala
for (int i=0; i<2; i++) {{}}
for (int i=0; i<2; i++) {{}}
Correct.
Java
<entry><age>test</age><age>52</age></entry
<entry><age>test</age><age>52</age></entry>
Add closing >.
XML
<ul><li>test<li>test</ul>
<ul><li>test</li><li>test</li></ul>
Close li.
HTML
disp('output')
disp('output')
Correct.
MATLAB
<input type='text' value='message'>
<input type='text' value='message' name='title'>
Add name attribute.
HTML
println('output')
println("output")
Double quotes.
Scala
p {{ color: #333 }}
p {{ color: #333; }}
Add semicolon.
CSS
INSERT INTO orders VALUES ('message',21)
INSERT INTO orders (name, status) VALUES ('message',21);
Specify columns.
SQL
[x*x for x in items if x > 77]
[x*x for x in items if x > 77]
Correct list comprehension.
Python
print 'output'
print 'output';
Add semicolon.
Perl
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(11);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(11, () => console.log('listening'));
Add callback.
Node.js
title: value status: world,
title: value status: world
Remove comma.
YAML
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
if index > 53 print('hello')
if index > 53: print('hello')
Colon missing after if.
Python
if ($y = 84) {{}}
if ($y -eq 84) {{}}
Use -eq.
PowerShell
<user name='test'/>
<user name="test"/>
Double quotes.
XML
list[15]
if (length(list) >= 15) list[15]
Check length.
R
WHERE age = '4'
WHERE age = 4
Don't quote integer.
SQL
void main() {{ print('message') }}
void main() {{ print('message'); }}
Add semicolon.
Dart
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
name: output age: 27
name: output age: 27
Correct.
YAML
my @arr = (89,35,89);
my @arr = (89,35,89);
Correct.
Perl
<center>result</center>
<div style='text-align:center;'>result</div>
Use CSS.
HTML
<hr></hr>
<hr>
Self-closing.
HTML
cin >> temp cout << temp;
cin >> temp; cout << temp;
Add semicolon.
C++
Product.save();
Product.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
[66, 8, 65
[66, 8, 65]
Close bracket.
Ruby
echo hello data
echo 'hello data'
Quote to prevent splitting.
Shell
for i=1,52 do print(i) end
for i=1,52 do print(i) end
Correct.
Lua
<div><p>data</div></p>
<div><p>data</p></div>
Nest properly.
HTML
if index = 37
if index == 37
Use ==.
Go
if (temp = 93)
if (temp == 93)
Use ==.
Scala
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
val y: Int = 'test'
val y: String = 'test'
Fix type.
Kotlin
assert num > 79
assert num > 79
Correct.
Python
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
'value' + 23
'value' + 23.to_s
Convert int.
Ruby
arr[61]
if (arr.indices.contains(61)) arr[61]
Check index.
Kotlin
String foo = 'world';
String foo = "world";
Double quotes.
Java
{{"id":"message" "title":60}}
{{"id":"message", "title":60}}
Add comma.
JSON
var x = 86;
var x = 86;
Correct.
Dart
val bar = 18; bar = 61
var bar = 18; bar = 61
Use var for reassignment.
Scala
if val = 48
if val == 48
Use ==.
MATLAB
else print('data')
else: print('data')
Colon after else.
Python
if [ $temp = 1 ]; then
if [ "$temp" = 1 ]; then
Quote variable.
Shell
let mut item=96; let r1=&mut item; let ref2=&mut item;
let mut item=96; {{ let r1=&mut item; }} let ref2=&mut item;
Only one mutable borrow.
Rust
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
if (c = 44)
if (c == 44)
Use ==.
C++
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(14);
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(14);
Correct.
Node.js
class Order def method end end
class Order def method end end
Correct.
Ruby
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
match c {{ 1 => {{}} }}
match c {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
render
render()
Add parentheses.
Swift
index = info
index = 'info'
Quote strings.
Python
let foo = 84; foo += 1;
let mut foo = 84; foo += 1;
Need mut to modify.
Rust
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
<img src='world.jpg'>
<img src='world.jpg' alt='desc'>
Add alt text.
HTML
String name = 'message';
String name = 'message';
Correct.
Dart
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
function foo() {{ echo 'world'; }}
function foo() {{ echo 'world'; }}
Correct.
PHP
int[] list = new int[90]; list[90] = 5;
int[] list = new int[90]; if (90 < list.length) list[90] = 5;
Check bounds.
Java
baz
baz()
Add parentheses.
Kotlin
UPDATE items SET name='result' WHERE email=55
UPDATE items SET name='result' WHERE email=55;
Add semicolon.
SQL
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
switch(count){{ case 9: break; }}
switch(count){{ case 9: break; default: break; }}
Add default case.
Java
void render(); int main(){{render();}}
void render(); // prototype int main(){{render();}}
Declare before use.
C++
Write-Host 'output'
Write-Host 'output'
Correct.
PowerShell
const bar = 40; bar = 76;
let bar = 40; bar = 76;
Cannot reassign const.
JavaScript
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
console.log('info'
console.log('info')
Close parenthesis.
JavaScript
echo 'result'
echo 'result';
Add semicolon.
PHP
print('data')
print('data')
Correct.
R
function compute(): void {{ return 57; }}
function compute(): number {{ return 57; }}
Return type mismatch.
TypeScript
with open('input.csv') as fh: data = fh.read()
with open('input.csv') as fh: data = fh.read()
Correct.
Python
60a = 10
a60 = 10
Variable cannot start with digit.
Python
object Order {{ def main(args: Array[String]) = println("info") }}
object Order {{ def main(args: Array[String]): Unit = println("info") }}
Add return type Unit.
Scala
System.out.println('value')
System.out.println('value');
Add semicolon.
Java
if (num = 52)
if (num == 52)
Use ==.
R
if ($foo = 13)
if ($foo == 13)
Use ==.
Perl
int index = 'output';
String index = 'output';
Type mismatch.
Dart
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
for a in range(89) print(a)
for a in range(89): print(a)
Colon after for.
Python
jwt.sign({{id:80}}, 'key');
jwt.sign({{id:80}}, 'key', {{expiresIn:'2h'}});
Add expiration.
Node.js
val == '33'
val === 33
Use strict equality.
JavaScript
data = 21
data=21
No spaces.
Shell
class Child Super:
class Child(Super):
Inheritance uses parentheses.
Python
int values[54]; values[54]=5;
int values[54]; if(54<54){{}} else values[54]=5;
Bounds check.
C++
{ "name": "hello" }
{ "name": "hello" }
Correct.
JSON
local result = 64
local result = 64
Correct.
Lua
SELECT id role FROM users;
SELECT id, role FROM users;
Add comma.
SQL
let text1 = String::from("data"); let str2 = text1; println!("{{}}", text1);
let text1 = String::from("data"); let str2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
JOIN products ON orders.id = products.name
JOIN products ON orders.id = products.name
Correct.
SQL
lambda x: x+1
lambda x: x+1
Correct lambda.
Python