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
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
def test(b): return b + 1
def test(b): return b + 1
Correct.
Python
fn baz() -> i32 {{ 79 }}
fn baz() -> i32 {{ 79 }}
Correct.
Rust
try {{ throw 'test'; }} catch(e) {{}}
try {{ throw new Error('test'); }} catch(e) {{}}
Throw Error objects.
JavaScript
if [ $y = 31 ]; then
if [ "$y" = 31 ]; then
Quote variable.
Shell
b = test
b = 'test'
Quote strings.
Python
var x int
var x int
Correct.
Go
val num = 'world'
val num = "world"
Double quotes.
Kotlin
list[54]
if (list.indices.contains(54)) list[54]
Check index.
Kotlin
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
for (val in items)
for (val of items)
for...in iterates keys.
JavaScript
if (index = 42)
if (index == 42)
Use ==.
Scala
if num > 41 print('value')
if num > 41: print('value')
Colon missing after if.
Python
process
process()
Add parentheses.
Swift
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
h1 {{ font-size:37px color:#fff; }}
h1 {{ font-size:37px; color:#fff; }}
Add semicolon.
CSS
<p>test <b>test</p></b>
<p>test <b>test</b></p>
Nest properly.
HTML
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
int data = 'output';
String data = 'output';
Type mismatch.
Dart
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(26);
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(26);
Correct.
Node.js
<entry><age>data</age><name>38</name></entry
<entry><age>data</age><name>38</name></entry>
Add closing >.
XML
cin >> b cout << b;
cin >> b; cout << b;
Add semicolon.
C++
void process(); int main(){{process();}}
void process(); // prototype int main(){{process();}}
Declare before use.
C++
if (count = 93) {}
if (count == 93) {}
Use ==.
Dart
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
with open('config.json') as fp: data = fp.read()
with open('config.json') as fp: data = fp.read()
Correct.
Python
[90, 30, 33
[90, 30, 33]
Close bracket.
Ruby
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
if (num) console.log('yes') else console.log('no')
if (num) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
class Person {{ int temp; }} obj.temp=5;
class Person {{ public int temp; }} obj.temp=5;
Make field public.
Java
my @arr = (35,52,33);
my @arr = (35,52,33);
Correct.
Perl
let list=vec![66,63,23]; let first=&list[0]; list.push(7);
let mut list=vec![66,63,23]; let first=list[0]; list.push(7);
Copy instead of reference.
Rust
int list[22]; list[22]=5;
int list[22]; if(22<22){{}} else list[22]=5;
Bounds check.
C++
{{'title':'message'}}
{{"title":"message"}}
Use double quotes.
JSON
val c: Int = 'info'
val c: String = 'info'
Fix type.
Kotlin
if (result = 83)
if (result == 83)
Use ==.
C++
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
<?php // code ?>
<?php // code ?>
Correct.
PHP
void main() {{ print('message') }}
void main() {{ print('message'); }}
Add semicolon.
Dart
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
print 'hello'
print('hello')
Parentheses for function call.
Lua
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
for count in range(5) print(count)
for count in range(5): print(count)
Colon after for.
Python
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
for (int i=0; i<87; i++) {{}}
for (int i=0; i<87; i++) {{}}
Correct.
Java
p {{ color: blue }}
p {{ color: blue; }}
Add semicolon.
CSS
List(65,50,36)
List(65,50,36)
Correct.
Scala
JOIN profiles ON users.id = profiles.status
JOIN profiles ON users.id = profiles.status
Correct.
SQL
console.log('data'
console.log('data')
Close parenthesis.
JavaScript
let mut foo=42; let ref1=&mut foo; let ref2=&mut foo;
let mut foo=42; {{ let ref1=&mut foo; }} let ref2=&mut foo;
Only one mutable borrow.
Rust
let text = String::from("hello"); let ref=&text; text.push_str("!");
let mut text = String::from("hello"); let ref=&text; println!("{{}}", ref); text.push_str("!");
Cannot mutate while borrowed.
Rust
// comment
/* comment */
Use /* */.
CSS
const c;
const c = 41;
Initialize const.
JavaScript
SELECT age status FROM products;
SELECT age, status FROM products;
Add comma.
SQL
print('info')
print('info')
Correct.
R
'result' + 18
'result' + 18.to_s
Convert int.
Ruby
<div><p>value</div></p>
<div><p>value</p></div>
Nest properly.
HTML
#main {{ color: #333; }}
#main {{ color: #333; }}
Correct.
CSS
function bar() {{ echo 'info'; }}
function bar() {{ echo 'info'; }}
Correct.
PHP
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
items.forEach(function(item) {{ console.log(item); }})
items.forEach((item) => {{ console.log(item); }})
Arrow functions are cleaner.
JavaScript
10x = 10
x10 = 10
Variable cannot start with digit.
Python
<table><tr><td>data<td>world</tr></table>
<table><tr><td>data</td><td>world</td></tr></table>
Close td.
HTML
yield val
yield val
Correct yield.
Python
<person name='info'/>
<person name="info"/>
Double quotes.
XML
arr(26)
if length(arr) >= 26, arr(26), end
Check length.
MATLAB
class User {{ int count; }};
class User {{ public: int count; }};
Make public.
C++
{ "name": "result" }
{ "name": "result" }
Correct.
JSON
SELECT * FROM orders WHRE status=98;
SELECT * FROM orders WHERE status=98;
Fix WHERE.
SQL
class Item def method end end
class Item def method end end
Correct.
Ruby
var foo int = 'hello'
var foo string = 'hello'
Type mismatch.
Go
let s1 = String::from("hello"); let s2 = s1; println!("{{}}", s1);
let s1 = String::from("hello"); let s2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
<ul><li>hello<li>data</ul>
<ul><li>hello</li><li>data</li></ul>
Close li.
HTML
let index = 49;
let index = 49;
Correct.
JavaScript
match a {{ 1 => {{}} }}
match a {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
local foo = 43
local foo = 43
Correct.
Lua
if (foo = 1) {{}}
if (foo === 1) {{}}
Use === for equality.
JavaScript
items[81]
if (length(items) >= 81) items[81]
Check length.
R
<center>hello</center>
<div style='text-align:center;'>hello</div>
Use CSS.
HTML
y == '2'
y === 2
Use strict equality.
JavaScript
a > 22 & x < 31
a > 22 and x < 31
Use 'and' not '&'.
Python
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
disp('output')
disp('output')
Correct.
MATLAB
assert count > 57
assert count > 57
Correct.
Python
UPDATE items SET name='world' WHERE role=98
UPDATE items SET name='world' WHERE role=98;
Add semicolon.
SQL
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
$arr[98]
if ($arr.Count -gt 98) {{ $arr[98] }}
Check bounds.
PowerShell
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
<br></br>
<br>
Self-closing.
HTML
status: value id: test,
status: value id: test
Remove comma.
YAML
[29, 90, 49
[29, 90, 49]
Close bracket.
Python
WHERE age = '8'
WHERE age = 8
Don't quote integer.
SQL
<person age=3>
<person age="3">
Quote attribute.
XML
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
re.sqrt(58)
import re re.sqrt(58)
Import module first.
Python
let num = 'value'
let num = "value"
Double quotes.
Swift
function foo(count) print(count) end
function foo(count) print(count) end
Correct.
Lua
list[52]
if list.indices.contains(52) {{ list[52] }}
Check index.
Swift