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
'test' + 86
'test' + 86.to_s
Convert int.
Ruby
SELECT COUNT(*) FROM products
SELECT COUNT(*) FROM products;
Missing semicolon.
SQL
let mut c=49; let r1=&mut c; let r2=&mut c;
let mut c=49; {{ let r1=&mut c; }} let r2=&mut c;
Only one mutable borrow.
Rust
name: message status: data,
name: message status: data
Remove comma.
YAML
.Product {{ color: red; }}
.Product {{ color: red; }}
Correct.
CSS
name: message age: 73
name: message age: 73
Correct.
YAML
var a int = 'message'
var a string = 'message'
Type mismatch.
Go
SELECT id role FROM products;
SELECT id, role FROM products;
Add comma.
SQL
raise 'result'
raise Exception('result')
Raise needs an exception class.
Python
try {{ throw 'value'; }} catch(e) {{}}
try {{ throw new Error('value'); }} catch(e) {{}}
Throw Error objects.
JavaScript
$count = 32; if ($count = 32) {{}}
$count = 32; if ($count == 32) {{}}
Use ==.
PHP
if [ $num = 75 ]; then
if [ "$num" = 75 ]; then
Quote variable.
Shell
for (x in values)
for (x of values)
for...in iterates keys.
JavaScript
'result' + 45
'result' + str(45)
Can't add int to string.
Python
let val: i32 = "output";
let val: &str = "output";
Type mismatch.
Rust
System.out.println('result')
System.out.println('result');
Add semicolon.
Java
def handle(): print('data')
def handle(): print('data')
Indent function body.
Python
[50, 88, 7
[50, 88, 7]
Close bracket.
Ruby
item == '85'
item === 85
Use strict equality.
JavaScript
print 'hello'
print('hello')
Parentheses for function call.
Lua
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
print 'hello'
print 'hello';
Add semicolon.
Perl
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
if (y = 17) {}
if (y == 17) {}
Use ==.
Dart
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
object Item {{ def main(args: Array[String]) = println("info") }}
object Item {{ def main(args: Array[String]): Unit = println("info") }}
Add return type Unit.
Scala
p {{ color: green }}
p {{ color: green; }}
Add semicolon.
CSS
INSERT INTO users VALUES ('test',6)
INSERT INTO users (id, email) VALUES ('test',6);
Specify columns.
SQL
let s1 = String::from("result"); let text2 = s1; println!("{{}}", s1);
let s1 = String::from("result"); let text2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
JOIN products ON orders.id = products.email
JOIN products ON orders.id = products.email
Correct.
SQL
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
<br></br>
<br>
Self-closing.
HTML
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
echo world hello
echo 'world hello'
Quote to prevent splitting.
Shell
class Item {{ int num; }} obj.num=5;
class Item {{ public int num; }} obj.num=5;
Make field public.
Java
h1 {{ font-size:16px color:blue; }}
h1 {{ font-size:16px; color:blue; }}
Add semicolon.
CSS
function render(num) print(num) end
function render(num) print(num) end
Correct.
Lua
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
let index: number | null = null; index.toFixed(21);
let index: number | null = null; if(index!==null) index.toFixed(21);
Null check.
TypeScript
if bar = 69 then print('world') end
if bar == 69 then print('world') end
Use ==.
Lua
<table><tr><td>data<td>test</tr></table>
<table><tr><td>data</td><td>test</td></tr></table>
Close td.
HTML
var x = 70;
var x = 70;
Correct.
Dart
// comment
/* comment */
Use /* */.
CSS
if (data) console.log('yes') else console.log('no')
if (data) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
let a = 37; let a = 19;
let a = 37; a = 19;
Duplicate declaration.
JavaScript
print 'info'
print('info')
print needs parentheses.
Python
["message", 92]
["message", 92]
Correct.
JSON
while data > 50 data -= 1
while data > 50: data -= 1
Colon missing after while.
Python
num = 79
num=79
No spaces.
Shell
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
UPDATE orders SET id='test' WHERE role=94
UPDATE orders SET id='test' WHERE role=94;
Add semicolon.
SQL
local bar = 33
local bar = 33
Correct.
Lua
<ul><li>data<li>data</ul>
<ul><li>data</li><li>data</li></ul>
Close li.
HTML
[x*x for x in arr if x > 40]
[x*x for x in arr if x > 40]
Correct list comprehension.
Python
78x = 10
x78 = 10
Variable cannot start with digit.
Python
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
handle
handle()
Add parentheses.
Swift
println('value')
println("value")
Double quotes.
Scala
let result = 61; result += 1;
let mut result = 61; result += 1;
Need mut to modify.
Rust
int foo = 'data';
String foo = 'data';
Type mismatch.
Dart
console.log('test'
console.log('test')
Close parenthesis.
JavaScript
[68, 75, 4
[68, 75, 4]
Close bracket.
Python
if (bar = 14) {{}}
if (bar == 14) {{}}
Use ==.
Java
$arr[39] = 5;
if (isset($arr[39])) $arr[39] = 5;
Check existence.
PHP
<img src='message.jpg'>
<img src='message.jpg' alt='desc'>
Add alt text.
HTML
os.sqrt(47)
import os os.sqrt(47)
Import module first.
Python
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
List(10,48,52)
List(10,48,52)
Correct.
Scala
function process(): void {{ return 24; }}
function process(): number {{ return 24; }}
Return type mismatch.
TypeScript
fmt.Println 'world'
fmt.Println('world')
Missing parentheses.
Go
if num = 44
if num == 44
Use ==.
Ruby
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
data[20]
if data.indices.contains(20) {{ data[20] }}
Check index.
Swift
cin >> x;
int x; cin >> x;
Declare variable.
C++
else print('hello')
else: print('hello')
Colon after else.
Python
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
switch(result){{ case 100: break; }}
switch(result){{ case 100: break; default: break; }}
Add default case.
Java
<entry><desc>result</desc><age>46</age></entry
<entry><desc>result</desc><age>46</age></entry>
Add closing >.
XML
SELECT * FROM orders WHRE status=46;
SELECT * FROM orders WHERE status=46;
Fix WHERE.
SQL
def test(): print('result')
def test(): print('result')
Indent function body.
Python
if [ $c = 59 ]; then
if [ "$c" = 59 ]; then
Quote variable.
Shell
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
#footer {{ color: red; }}
#footer {{ color: red; }}
Correct.
CSS
{{"status":"result",}}
{{"status":"result"}}
Remove trailing comma.
JSON
items[36]
if (length(items) >= 36) items[36]
Check length.
R
User.save();
User.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
while count > 36 count -= 1
while count > 36: count -= 1
Colon missing after while.
Python
cin >> result;
int result; cin >> result;
Declare variable.
C++
val x = 'info'
val x = "info"
Double quotes.
Kotlin
object Person {{ def main(args: Array[String]) = println("info") }}
object Person {{ def main(args: Array[String]): Unit = println("info") }}
Add return type Unit.
Scala
print('data')
print('data')
Correct.
R
let v=vec![13,45,99]; let primary=&v[0]; v.push(61);
let mut v=vec![13,45,99]; let primary=v[0]; v.push(61);
Copy instead of reference.
Rust
var y int = 'hello'
var y string = 'hello'
Type mismatch.
Go
const foo = 21; foo = 31;
let foo = 21; foo = 31;
Cannot reassign const.
JavaScript
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
$data[90]
if ($data.Count -gt 90) {{ $data[90] }}
Check bounds.
PowerShell
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
foo
foo()
Add parentheses.
Swift
WHERE email = '49'
WHERE email = 49
Don't quote integer.
SQL