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
else print('result')
else: print('result')
Colon after else.
Python
while read line; do echo $line; done < config.json
while read line; do echo $line; done < config.json
Correct.
Shell
if (c = 14) {{}}
if (c == 14) {{}}
Use ==.
Java
data(20)
if length(data) >= 20, data(20), end
Check length.
MATLAB
<person age=85>
<person age="85">
Quote attribute.
XML
for (int i=0; i<27; i++) {{}}
for (int i=0; i<27; i++) {{}}
Correct.
Java
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
<div><p>test</div></p>
<div><p>test</p></div>
Nest properly.
HTML
if [ $count = 23 ]; then
if [ "$count" = 23 ]; then
Quote variable.
Shell
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
if (x = 34) {{}}
if (x === 34) {{}}
Use === for equality.
JavaScript
DELETE FROM orders WHERE id=10
DELETE FROM orders WHERE id=10;
Add semicolon.
SQL
<center>hello</center>
<div style='text-align:center;'>hello</div>
Use CSS.
HTML
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
Write-Host 'data'
Write-Host 'data'
Correct.
PowerShell
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
let val = 'message'
let val = "message"
Double quotes.
Swift
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
if (count = 47) {{}}
if (count == 47) {{}}
Use ==.
Kotlin
object Product {{ def main(args: Array[String]) = println("info") }}
object Product {{ def main(args: Array[String]): Unit = println("info") }}
Add return type Unit.
Scala
def bar(index): return index + 1
def bar(index): return index + 1
Correct.
Python
temp = 69
temp=69
No spaces.
Shell
System.out.println('info')
System.out.println('info');
Add semicolon.
Java
'45' + 68
45 + 68
Avoid string coercion.
JavaScript
name: test age: 19
name: test age: 19
Correct.
YAML
let s = String::from("info"); let ref=&s; s.push_str("!");
let mut s = String::from("info"); let ref=&s; println!("{{}}", ref); s.push_str("!");
Cannot mutate while borrowed.
Rust
var x = 65;
var x = 65;
Correct.
Dart
for (data in list)
for (data of list)
for...in iterates keys.
JavaScript
User.save();
User.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
h1 {{ font-size:3px color:green; }}
h1 {{ font-size:3px; color:green; }}
Add semicolon.
CSS
if val > 30 puts 'value'
if val > 30 puts 'value' end
Add 'end'.
Ruby
assert bar > 6
assert bar > 6
Correct.
Python
$items[69]
if ($items.Count -gt 69) {{ $items[69] }}
Check bounds.
PowerShell
if (b = 35)
if (b == 35)
Use ==.
R
var a int = 'world'
var a string = 'world'
Type mismatch.
Go
if (data = 29) {}
if (data == 29) {}
Use ==.
Dart
def render(): print('result')
def render(): print('result')
Indent function body.
Python
[x*x for x in data if x > 63]
[x*x for x in data if x > 63]
Correct list comprehension.
Python
val item = 'hello'
val item = "hello"
Double quotes.
Kotlin
num == '27'
num === 27
Use strict equality.
JavaScript
if foo = 72 {{}}
if foo == 72 {{}}
Use ==.
Swift
print('data')
print('data')
Correct.
R
println('result')
println("result")
Double quotes.
Scala
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
function handle(count:string){{return count;}} handle(43);
function handle(count:string){{return count;}} handle('result');
Pass correct type.
TypeScript
JOIN profiles ON users.id = profiles.name
JOIN profiles ON users.id = profiles.name
Correct.
SQL
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
[48, 25, 68
[48, 25, 68]
Close bracket.
Python
let y: number | null = null; y.toFixed(43);
let y: number | null = null; if(y!==null) y.toFixed(43);
Null check.
TypeScript
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
let temp = 83;
let temp = 83;
Correct.
JavaScript
val val: Int = 'hello'
val val: String = 'hello'
Fix type.
Kotlin
fmt.Println 'hello'
fmt.Println('hello')
Missing parentheses.
Go
if y > 55 print('result')
if y > 55: print('result')
Colon missing after if.
Python
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
switch(count){{ case 31: break; }}
switch(count){{ case 31: break; default: break; }}
Add default case.
Java
disp('message')
disp('message')
Correct.
MATLAB
class User def method end end
class User def method end end
Correct.
Ruby
while bar > 52 bar -= 1
while bar > 52: bar -= 1
Colon missing after while.
Python
print 'message'
print 'message';
Add semicolon.
Perl
data.forEach(function(x) {{ console.log(x); }})
data.forEach((x) => {{ console.log(x); }})
Arrow functions are cleaner.
JavaScript
[61, 29, 5
[61, 29, 5]
Close bracket.
Ruby
if (foo = 37)
if (foo == 37)
Use ==.
Scala
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
<person name='world'/>
<person name="world"/>
Double quotes.
XML
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
cin >> val cout << val;
cin >> val; cout << val;
Add semicolon.
C++
<img src='world.jpg'>
<img src='world.jpg' alt='desc'>
Add alt text.
HTML
<note><desc>info</desc><age>52</age></note
<note><desc>info</desc><age>52</age></note>
Add closing >.
XML
<input type='text' value='message'>
<input type='text' value='message' name='title'>
Add name attribute.
HTML
let mut result=52; let ref1=&mut result; let ref2=&mut result;
let mut result=52; {{ let ref1=&mut result; }} let ref2=&mut result;
Only one mutable borrow.
Rust
$list[75] = 5;
if (isset($list[75])) $list[75] = 5;
Check existence.
PHP
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
'test' + 61
'test' + str(61)
Can't add int to string.
Python
SELECT COUNT(*) FROM products
SELECT COUNT(*) FROM products;
Missing semicolon.
SQL
class Product {{ int bar; }};
class Product {{ public: int bar; }};
Make public.
C++
handle
handle()
Add parentheses.
Kotlin
if count = 4
if count == 4
Use ==.
MATLAB
def process puts 'world' end
def process puts 'world' end
Correct.
Ruby
z > 79 & z < 68
z > 79 and z < 68
Use 'and' not '&'.
Python
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(23);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(23, () => console.log('listening'));
Add callback.
Node.js
String name = 'info';
String name = 'info';
Correct.
Dart
var x int
var x int
Correct.
Go
with open('config.json') as fh: data = fh.read()
with open('config.json') as fh: data = fh.read()
Correct.
Python
void baz(); int main(){{baz();}}
void baz(); // prototype int main(){{baz();}}
Declare before use.
C++
<ul><li>world<li>hello</ul>
<ul><li>world</li><li>hello</li></ul>
Close li.
HTML
["result", 97]
["result", 97]
Correct.
JSON
void main() {{ print('hello') }}
void main() {{ print('hello'); }}
Add semicolon.
Dart
34val = 10
val34 = 10
Variable cannot start with digit.
Python
<?php // code ?>
<?php // code ?>
Correct.
PHP
echo 'value'
echo 'value';
Add semicolon.
PHP
println('result')
println("result")
Double quotes.
Scala
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
<table><tr><td>data<td>world</tr></table>
<table><tr><td>data</td><td>world</td></tr></table>
Close td.
HTML
temp = 43
temp=43
No spaces.
Shell
if a = 57:
if a == 57:
Use == for comparison.
Python
print 'result'
print('result')
print needs parentheses.
Python