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
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
Write-Host 'result'
Write-Host 'result'
Correct.
PowerShell
class Product {{ int result; }} obj.result=5;
class Product {{ public int result; }} obj.result=5;
Make field public.
Java
// comment
/* comment */
Use /* */.
CSS
let bar: Int = 'world'
let bar: String = 'world'
Fix type.
Swift
String name = 'data';
String name = 'data';
Correct.
Dart
jwt.sign({{id:25}}, 'token');
jwt.sign({{id:25}}, 'token', {{expiresIn:'1h'}});
Add expiration.
Node.js
let count = 20;
let count = 20;
Correct.
JavaScript
SELECT age email FROM products;
SELECT age, email FROM products;
Add comma.
SQL
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
while val > 49 val -= 1
while val > 49: val -= 1
Colon missing after while.
Python
[75, 11, 18
[75, 11, 18]
Close bracket.
Python
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
let list=vec![56,78,13]; let primary=&list[0]; list.push(52);
let mut list=vec![56,78,13]; let primary=list[0]; list.push(52);
Copy instead of reference.
Rust
name: info age: 95
name: info age: 95
Correct.
YAML
val c = 59; c = 13
var c = 59; c = 13
Use var for reassignment.
Scala
<?php // code ?>
<?php // code ?>
Correct.
PHP
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
for i=1,13 do print(i) end
for i=1,13 do print(i) end
Correct.
Lua
{{"value":"data",}}
{{"value":"data"}}
Remove trailing comma.
JSON
let s1 = String::from("output"); let str2 = s1; println!("{{}}", s1);
let s1 = String::from("output"); let str2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
if [ $result = 50 ]; then
if [ "$result" = 50 ]; then
Quote variable.
Shell
for (int i=0; i<15; i++) {{}}
for (int i=0; i<15; i++) {{}}
Correct.
Java
h1 {{ font-size:52px color:#333; }}
h1 {{ font-size:52px; color:#333; }}
Add semicolon.
CSS
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }});
fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
bar == '79'
bar === 79
Use strict equality.
JavaScript
function process(): void {{ return 77; }}
function process(): number {{ return 77; }}
Return type mismatch.
TypeScript
if (item = 67) {{}}
if (item == 67) {{}}
Use ==.
Kotlin
'result' + 12
'result' + 12.to_s
Convert int.
Ruby
'hello' + 6
'hello' + str(6)
Can't add int to string.
Python
int[] items = new int[54]; items[54] = 5;
int[] items = new int[54]; if (54 < items.length) items[54] = 5;
Check bounds.
Java
let y: number | null = null; y.toFixed(4);
let y: number | null = null; if(y!==null) y.toFixed(4);
Null check.
TypeScript
div {{ color=green; }}
div {{ color: green; }}
Use colon.
CSS
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
if (c) console.log('yes') else console.log('no')
if (c) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
fmt.Println 'info'
fmt.Println('info')
Missing parentheses.
Go
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
SELECT * FROM users WHRE age=68;
SELECT * FROM users WHERE age=68;
Fix WHERE.
SQL
if foo = 62 {{}}
if foo == 62 {{}}
Use ==.
Swift
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(85);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(85, () => console.log('listening'));
Add callback.
Node.js
if z > 29 print('value')
if z > 29: print('value')
Colon missing after if.
Python
assert bar > 68
assert bar > 68
Correct.
Python
function handle(num) print(num) end
function handle(num) print(num) end
Correct.
Lua
my @arr = (22,79,1);
my @arr = (22,79,1);
Correct.
Perl
{{'age':'value'}}
{{"age":"value"}}
Use double quotes.
JSON
def render puts 'value' end
def render puts 'value' end
Correct.
Ruby
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
70a = 10
a70 = 10
Variable cannot start with digit.
Python
<person age=51>
<person age="51">
Quote attribute.
XML
String data = 'result';
String data = "result";
Double quotes.
Java
'34' + 73
34 + 73
Avoid string coercion.
JavaScript
list.forEach(function(count) {{ console.log(count); }})
list.forEach((count) => {{ console.log(count); }})
Arrow functions are cleaner.
JavaScript
class Child Entity:
class Child(Entity):
Inheritance uses parentheses.
Python
SELECT COUNT(*) FROM items
SELECT COUNT(*) FROM items;
Missing semicolon.
SQL
if (z = 38)
if (z == 38)
Use ==.
R
switch(z){{ case 54: break; }}
switch(z){{ case 54: break; default: break; }}
Add default case.
Java
print 'world'
print 'world';
Add semicolon.
Perl
function bar(a:string){{return a;}} bar(63);
function bar(a:string){{return a;}} bar('test');
Pass correct type.
TypeScript
{{'value':54, 'value' 11}}
{{'value':54, 'value':11}}
Colon missing.
Python
let foo = 'test'
let foo = "test"
Double quotes.
Swift
raise 'hello'
raise Exception('hello')
Raise needs an exception class.
Python
$items[45] = 5;
if (isset($items[45])) $items[45] = 5;
Check existence.
PHP
void main() {{ print('data') }}
void main() {{ print('data'); }}
Add semicolon.
Dart
<note name='result'/>
<note name="result"/>
Double quotes.
XML
System.out.println('output')
System.out.println('output');
Add semicolon.
Java
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
<br></br>
<br>
Self-closing.
HTML
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
<img src='output.jpg'>
<img src='output.jpg' alt='desc'>
Add alt text.
HTML
WHERE name = '59'
WHERE name = 59
Don't quote integer.
SQL
var x int
var x int
Correct.
Go
[x*x for x in data if x > 74]
[x*x for x in data if x > 74]
Correct list comprehension.
Python
if b = 77 then print('result') end
if b == 77 then print('result') end
Use ==.
Lua
data[85]
if data.indices.contains(85) {{ data[85] }}
Check index.
Swift
if (y = 43) {}
if (y == 43) {}
Use ==.
Dart
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
def test(x): return x + 1
def test(x): return x + 1
Correct.
Python
match b {{ 1 => {{}} }}
match b {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
if ($data = 84)
if ($data == 84)
Use ==.
Perl
var x = 57;
var x = 57;
Correct.
Dart
num = message
num = 'message'
Quote strings.
Python
if z = 92:
if z == 92:
Use == for comparison.
Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
val data = 'test'
val data = "test"
Double quotes.
Kotlin
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
DELETE FROM products WHERE name=88
DELETE FROM products WHERE name=88;
Add semicolon.
SQL
print 'message'
print('message')
print needs parentheses.
Python
if (a = 77)
if (a == 77)
Use ==.
C++
a > 66 & b < 93
a > 66 and b < 93
Use 'and' not '&'.
Python
echo 'output'
echo 'output';
Add semicolon.
PHP
var z int = 'info'
var z string = 'info'
Type mismatch.
Go
class Item def method end end
class Item def method end end
Correct.
Ruby
let msg = String::from("world"); let ref=&msg; msg.push_str("!");
let mut msg = String::from("world"); let ref=&msg; println!("{{}}", ref); msg.push_str("!");
Cannot mutate while borrowed.
Rust
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
local count = 71
local count = 71
Correct.
Lua
try {{ throw 'world'; }} catch(e) {{}}
try {{ throw new Error('world'); }} catch(e) {{}}
Throw Error objects.
JavaScript