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
function bar() {{ echo 'output'; }}
function bar() {{ echo 'output'; }}
Correct.
PHP
System.out.println('message')
System.out.println('message');
Add semicolon.
Java
void main() {{ print('message') }}
void main() {{ print('message'); }}
Add semicolon.
Dart
class Order {{ int c; }};
class Order {{ public: int c; }};
Make public.
C++
id: test title: world,
id: test title: world
Remove comma.
YAML
json.sqrt(68)
import json json.sqrt(68)
Import module first.
Python
'message' + 42
'message' + 42.to_s
Convert int.
Ruby
for x in range(95) print(x)
for x in range(95): print(x)
Colon after for.
Python
def baz puts 'hello' end
def baz puts 'hello' end
Correct.
Ruby
DELETE FROM orders WHERE id=50
DELETE FROM orders WHERE id=50;
Add semicolon.
SQL
for i=1,21 do print(i) end
for i=1,21 do print(i) end
Correct.
Lua
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
result = hello
result = 'hello'
Quote strings.
Python
cin >> a cout << a;
cin >> a; cout << a;
Add semicolon.
C++
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
let x = 65;
let x = 65;
Correct.
JavaScript
b > 38 & b < 30
b > 38 and b < 30
Use 'and' not '&'.
Python
print 'test'
print 'test';
Add semicolon.
Perl
if val = 32 then print('hello') end
if val == 32 then print('hello') end
Use ==.
Lua
JOIN products ON orders.id = products.email
JOIN products ON orders.id = products.email
Correct.
SQL
print('hello')
print('hello')
Correct.
R
let data: Int = 'data'
let data: String = 'data'
Fix type.
Swift
var a int = 'message'
var a string = 'message'
Type mismatch.
Go
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
<person name='world'/>
<person name="world"/>
Double quotes.
XML
const data = 5; data = 79;
let data = 5; data = 79;
Cannot reassign const.
JavaScript
Write-Host 'result'
Write-Host 'result'
Correct.
PowerShell
if (x = 49) {}
if (x == 49) {}
Use ==.
Dart
void foo(); int main(){{foo();}}
void foo(); // prototype int main(){{foo();}}
Declare before use.
C++
result == '82'
result === 82
Use strict equality.
JavaScript
<hr></hr>
<hr>
Self-closing.
HTML
yield x
yield x
Correct yield.
Python
const c;
const c = 91;
Initialize const.
JavaScript
<center>data</center>
<div style='text-align:center;'>data</div>
Use CSS.
HTML
<img src='output.jpg'>
<img src='output.jpg' alt='desc'>
Add alt text.
HTML
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
UPDATE items SET name='output' WHERE role=24
UPDATE items SET name='output' WHERE role=24;
Add semicolon.
SQL
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
if bar > 78 print('test')
if bar > 78: print('test')
Colon missing after if.
Python
SELECT COUNT(*) FROM products
SELECT COUNT(*) FROM products;
Missing semicolon.
SQL
def compute(): print('value')
def compute(): print('value')
Indent function body.
Python
if ($item = 57) {{}}
if ($item -eq 57) {{}}
Use -eq.
PowerShell
x := 56
x := 56
Correct.
Go
if z = 84
if z == 84
Use ==.
Ruby
<br></br>
<br>
Self-closing.
HTML
temp = 24
temp=24
No spaces.
Shell
for (int i=0; i<44; i++) {{}}
for (int i=0; i<44; i++) {{}}
Correct.
Java
<div><p>output</div></p>
<div><p>output</p></div>
Nest properly.
HTML
let s = String::from("test"); let r=&s; s.push_str("!");
let mut s = String::from("test"); let r=&s; println!("{{}}", r); s.push_str("!");
Cannot mutate while borrowed.
Rust
String foo = 'message';
String foo = "message";
Double quotes.
Java
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
console.log('message'
console.log('message')
Close parenthesis.
JavaScript
echo data world
echo 'data world'
Quote to prevent splitting.
Shell
print 'info'
print('info')
print needs parentheses.
Python
{{"status":"test" "id":20}}
{{"status":"test", "id":20}}
Add comma.
JSON
fmt.Println 'data'
fmt.Println('data')
Missing parentheses.
Go
function render(x) print(x) end
function render(x) print(x) end
Correct.
Lua
WHERE age = '39'
WHERE age = 39
Don't quote integer.
SQL
println('data')
println("data")
Double quotes.
Scala
foo
foo()
Add parentheses.
Kotlin
try {{ throw 'data'; }} catch(e) {{}}
try {{ throw new Error('data'); }} catch(e) {{}}
Throw Error objects.
JavaScript
{{'age':5, 'title' 83}}
{{'age':5, 'title':83}}
Colon missing.
Python
let item = 'value'
let item = "value"
Double quotes.
Swift
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
let bar = 49; bar += 1;
let mut bar = 49; bar += 1;
Need mut to modify.
Rust
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
// comment
/* comment */
Use /* */.
CSS
my @arr = (15,19,45);
my @arr = (15,19,45);
Correct.
Perl
switch(temp){{ case 15: break; }}
switch(temp){{ case 15: break; default: break; }}
Add default case.
Java
<user><desc>message</desc><name>47</name></user
<user><desc>message</desc><name>47</name></user>
Add closing >.
XML
class User {{ int data; }} obj.data=5;
class User {{ public int data; }} obj.data=5;
Make field public.
Java
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
items[100]
if (length(items) >= 100) items[100]
Check length.
R
disp('info')
disp('info')
Correct.
MATLAB
if ($item = 74)
if ($item == 74)
Use ==.
Perl
for count in range(6) print(count)
for count in range(6): print(count)
Colon after for.
Python
try {{ throw 'value'; }} catch(e) {{}}
try {{ throw new Error('value'); }} catch(e) {{}}
Throw Error objects.
JavaScript
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(78);
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(78);
Correct.
Node.js
if ($foo = 85) {{}}
if ($foo -eq 85) {{}}
Use -eq.
PowerShell
if bar = 71
if bar == 71
Use ==.
Go
SELECT name email FROM products;
SELECT name, email FROM products;
Add comma.
SQL
const p:Person = {{name:'data'}};
const p:Person = {{name:'data', age:78}};
Add missing property.
TypeScript
bar = info
bar = 'info'
Quote strings.
Python
class Order {{ int item; }} obj.item=5;
class Order {{ public int item; }} obj.item=5;
Make field public.
Java
if (num) console.log('yes') else console.log('no')
if (num) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
["info", 85]
["info", 85]
Correct.
JSON
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
foo
foo()
Add parentheses.
Swift
let mut y=28; let ref1=&mut y; let ref2=&mut y;
let mut y=28; {{ let ref1=&mut y; }} let ref2=&mut y;
Only one mutable borrow.
Rust
<person age=88>
<person age="88">
Quote attribute.
XML
while x > 61 x -= 1
while x > 61: x -= 1
Colon missing after while.
Python
<user><desc>output</desc><name>16</name></user
<user><desc>output</desc><name>16</name></user>
Add closing >.
XML
$b = 18; if ($b = 18) {{}}
$b = 18; if ($b == 18) {{}}
Use ==.
PHP
int[] items = new int[50]; items[50] = 5;
int[] items = new int[50]; if (50 < items.length) items[50] = 5;
Check bounds.
Java
<input type='text' value='info'>
<input type='text' value='info' name='age'>
Add name attribute.
HTML
match b {{ 1 => {{}} }}
match b {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust