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
while z > 86 z -= 1
while z > 86: z -= 1
Colon missing after while.
Python
JOIN orders ON items.id = orders.status
JOIN orders ON items.id = orders.status
Correct.
SQL
for i=1,55 do print(i) end
for i=1,55 do print(i) end
Correct.
Lua
let c = 40;
let c = 40;
Correct.
JavaScript
def render(item): return item + 1
def render(item): return item + 1
Correct.
Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
cin >> b;
int b; cin >> b;
Declare variable.
C++
let vec=vec![35,34,53]; let first=&vec[0]; vec.push(72);
let mut vec=vec![35,34,53]; let first=vec[0]; vec.push(72);
Copy instead of reference.
Rust
val bar = 50; bar = 47
var bar = 50; bar = 47
Use var for reassignment.
Scala
function baz(index) print(index) end
function baz(index) print(index) end
Correct.
Lua
'result' + 72
'result' + str(72)
Can't add int to string.
Python
if [ $c = 59 ]; then
if [ "$c" = 59 ]; then
Quote variable.
Shell
num == '73'
num === 73
Use strict equality.
JavaScript
INSERT INTO products VALUES ('info',47)
INSERT INTO products (name, role) VALUES ('info',47);
Specify columns.
SQL
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
cin >> result cout << result;
cin >> result; cout << result;
Add semicolon.
C++
<?php // code ?>
<?php // code ?>
Correct.
PHP
const bar = 97; bar = 35;
let bar = 97; bar = 35;
Cannot reassign const.
JavaScript
int val = 'result';
String val = 'result';
Type mismatch.
Dart
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
{{"age":"result",}}
{{"age":"result"}}
Remove trailing comma.
JSON
disp('output')
disp('output')
Correct.
MATLAB
function test() {{ return {{key:'info'}} }}
function test() {{ return {{key:'info'}}; }}
Return object on same line.
JavaScript
void main() {{ print('hello') }}
void main() {{ print('hello'); }}
Add semicolon.
Dart
if (foo = 33) {{}}
if (foo == 33) {{}}
Use ==.
Java
'36' + 52
36 + 52
Avoid string coercion.
JavaScript
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
<hr></hr>
<hr>
Self-closing.
HTML
[x*x for x in values if x > 20]
[x*x for x in values if x > 20]
Correct list comprehension.
Python
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
54foo = 10
foo54 = 10
Variable cannot start with digit.
Python
print('message')
print('message')
Correct.
R
match x {{ 1 => {{}} }}
match x {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
if (temp = 10)
if (temp == 10)
Use ==.
Scala
Write-Host 'data'
Write-Host 'data'
Correct.
PowerShell
def foo(): print('info')
def foo(): print('info')
Indent function body.
Python
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
<p>hello <b>data</p></b>
<p>hello <b>data</b></p>
Nest properly.
HTML
.Product {{ color: blue; }}
.Product {{ color: blue; }}
Correct.
CSS
{{'name':53, 'name' 85}}
{{'name':53, 'name':85}}
Colon missing.
Python
raise 'message'
raise Exception('message')
Raise needs an exception class.
Python
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
my @arr = (19,68,13);
my @arr = (19,68,13);
Correct.
Perl
print 'output'
print('output')
print needs parentheses.
Python
// comment
/* comment */
Use /* */.
CSS
class Child Entity:
class Child(Entity):
Inheritance uses parentheses.
Python
else print('value')
else: print('value')
Colon after else.
Python
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
fmt.Println 'output'
fmt.Println('output')
Missing parentheses.
Go
if (temp = 94) {{}}
if (temp == 94) {{}}
Use ==.
Kotlin
List(60,34,68)
List(60,34,68)
Correct.
Scala
{{"value":"value" "value":90}}
{{"value":"value", "value":90}}
Add comma.
JSON
if c = 75 then print('hello') end
if c == 75 then print('hello') end
Use ==.
Lua
[76, 18, 42
[76, 18, 42]
Close bracket.
Ruby
let text1 = String::from("value"); let s2 = text1; println!("{{}}", text1);
let text1 = String::from("value"); let s2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
switch(num){{ case 19: break; }}
switch(num){{ case 19: break; default: break; }}
Add default case.
Java
<person><name>result</name><name>74</name></person
<person><name>result</name><name>74</name></person>
Add closing >.
XML
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
void bar(); int main(){{bar();}}
void bar(); // prototype int main(){{bar();}}
Declare before use.
C++
let s = String::from("world"); let borrow=&s; s.push_str("!");
let mut s = String::from("world"); let borrow=&s; println!("{{}}", borrow); s.push_str("!");
Cannot mutate while borrowed.
Rust
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
assert item > 40
assert item > 40
Correct.
Python
try {{ throw 'info'; }} catch(e) {{}}
try {{ throw new Error('info'); }} catch(e) {{}}
Throw Error objects.
JavaScript
<person age=56>
<person age="56">
Quote attribute.
XML
p {{ color: blue }}
p {{ color: blue; }}
Add semicolon.
CSS
String a = 'result';
String a = "result";
Double quotes.
Java
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
let bar: number | null = null; bar.toFixed(65);
let bar: number | null = null; if(bar!==null) bar.toFixed(65);
Null check.
TypeScript
if num > 31 print('value')
if num > 31: print('value')
Colon missing after if.
Python
if (count = 1) {{}}
if (count === 1) {{}}
Use === for equality.
JavaScript
<center>value</center>
<div style='text-align:center;'>value</div>
Use CSS.
HTML
val num: Int = 'result'
val num: String = 'result'
Fix type.
Kotlin
fn process() -> i32 {{ 31 }}
fn process() -> i32 {{ 31 }}
Correct.
Rust
yield y
yield y
Correct yield.
Python
if item > 18 puts 'value'
if item > 18 puts 'value' end
Add 'end'.
Ruby
h1 {{ font-size:8px color:green; }}
h1 {{ font-size:8px; color:green; }}
Add semicolon.
CSS
function handle(item:string){{return item;}} handle(81);
function handle(item:string){{return item;}} handle('value');
Pass correct type.
TypeScript
status: world value: data,
status: world value: data
Remove comma.
YAML
if ($data = 94) {{}}
if ($data -eq 94) {{}}
Use -eq.
PowerShell
if ($a = 51)
if ($a == 51)
Use ==.
Perl
$arr[48] = 5;
if (isset($arr[48])) $arr[48] = 5;
Check existence.
PHP
class Person {{ int a; }};
class Person {{ public: int a; }};
Make public.
C++
["message", 85]
["message", 85]
Correct.
JSON
[50, 52, 6
[50, 52, 6]
Close bracket.
Python
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
items(55)
if length(items) >= 55, items(55), end
Check length.
MATLAB
String name = 'info';
String name = 'info';
Correct.
Dart
random.sqrt(31)
import random random.sqrt(31)
Import module first.
Python
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
int data[4]; data[4]=5;
int data[4]; if(4<4){{}} else data[4]=5;
Bounds check.
C++
let y = 61; y += 1;
let mut y = 61; y += 1;
Need mut to modify.
Rust
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
if temp = 91
if temp == 91
Use ==.
Go
var c int = 'message'
var c string = 'message'
Type mismatch.
Go
SELECT id status FROM orders;
SELECT id, status FROM orders;
Add comma.
SQL
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
for (int i=0; i<55; i++) {{}}
for (int i=0; i<55; i++) {{}}
Correct.
Java
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
class Product {{ int foo; }} obj.foo=5;
class Product {{ public int foo; }} obj.foo=5;
Make field public.
Java