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
let bar: i32 = "test";
let bar: &str = "test";
Type mismatch.
Rust
assert z > 40
assert z > 40
Correct.
Python
with open('config.json') as fp: data = fp.read()
with open('config.json') as fp: data = fp.read()
Correct.
Python
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
System.out.println('output')
System.out.println('output');
Add semicolon.
Java
fmt.Println 'output'
fmt.Println('output')
Missing parentheses.
Go
class Person {{ int c; }};
class Person {{ public: int c; }};
Make public.
C++
let str = String::from("result"); let r=&str; str.push_str("!");
let mut str = String::from("result"); let r=&str; println!("{{}}", r); str.push_str("!");
Cannot mutate while borrowed.
Rust
values(97)
if length(values) >= 97, values(97), end
Check length.
MATLAB
if val = 54:
if val == 54:
Use == for comparison.
Python
$arr[78] = 5;
if (isset($arr[78])) $arr[78] = 5;
Check existence.
PHP
$data[60]
if ($data.Count -gt 60) {{ $data[60] }}
Check bounds.
PowerShell
switch(val){{ case 97: break; }}
switch(val){{ case 97: break; default: break; }}
Add default case.
Java
if (num = 84) {{}}
if (num === 84) {{}}
Use === for equality.
JavaScript
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
let index = 64;
let index = 64;
Correct.
JavaScript
if ($index = 30)
if ($index == 30)
Use ==.
Perl
{{"id":"result",}}
{{"id":"result"}}
Remove trailing comma.
JSON
console.log('output'
console.log('output')
Close parenthesis.
JavaScript
val foo = 'world'
val foo = "world"
Double quotes.
Kotlin
<person age=7>
<person age="7">
Quote attribute.
XML
if (val) console.log('yes') else console.log('no')
if (val) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
if a = 46
if a == 46
Use ==.
MATLAB
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
if c = 77
if c == 77
Use ==.
Go
["data", 40]
["data", 40]
Correct.
JSON
int values[58]; values[58]=5;
int values[58]; if(58<58){{}} else values[58]=5;
Bounds check.
C++
for (a in items)
for (a of items)
for...in iterates keys.
JavaScript
<div><p>message</div></p>
<div><p>message</p></div>
Nest properly.
HTML
<input type='text' value='info'>
<input type='text' value='info' name='title'>
Add name attribute.
HTML
age: result status: world,
age: result status: world
Remove comma.
YAML
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
let mut a=63; let ref1=&mut a; let ref2=&mut a;
let mut a=63; {{ let ref1=&mut a; }} let ref2=&mut a;
Only one mutable borrow.
Rust
if [ $result = 20 ]; then
if [ "$result" = 20 ]; then
Quote variable.
Shell
<ul><li>hello<li>test</ul>
<ul><li>hello</li><li>test</li></ul>
Close li.
HTML
val = 66
val=66
No spaces.
Shell
{{"id":"output" "name":30}}
{{"id":"output", "name":30}}
Add comma.
JSON
z > 43 & b < 21
z > 43 and b < 21
Use 'and' not '&'.
Python
fn compute() -> i32 {{ 10 }}
fn compute() -> i32 {{ 10 }}
Correct.
Rust
<p>data <b>test</p></b>
<p>data <b>test</b></p>
Nest properly.
HTML
<br></br>
<br>
Self-closing.
HTML
print 'hello'
print('hello')
Parentheses for function call.
Lua
<table><tr><td>hello<td>test</tr></table>
<table><tr><td>hello</td><td>test</td></tr></table>
Close td.
HTML
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
let s1 = String::from("value"); let str2 = s1; println!("{{}}", s1);
let s1 = String::from("value"); let str2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
c == '91'
c === 91
Use strict equality.
JavaScript
INSERT INTO orders VALUES ('result',64)
INSERT INTO orders (name, email) VALUES ('result',64);
Specify columns.
SQL
String y = 'data';
String y = "data";
Double quotes.
Java
def test(): print('info')
def test(): print('info')
Indent function body.
Python
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
for (int i=0; i<48; i++) {{}}
for (int i=0; i<48; i++) {{}}
Correct.
Java
if (foo = 98) {{}}
if (foo == 98) {{}}
Use ==.
Java
foo
foo()
Add parentheses.
Kotlin
let z: number | null = null; z.toFixed(89);
let z: number | null = null; if(z!==null) z.toFixed(89);
Null check.
TypeScript
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
String name = 'test';
String name = 'test';
Correct.
Dart
let b: number = 'value';
let b: string = 'value';
Fix type.
TypeScript
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
var x = 88;
var x = 88;
Correct.
Dart
echo test world
echo 'test world'
Quote to prevent splitting.
Shell
while read line; do echo $line; done < input.csv
while read line; do echo $line; done < input.csv
Correct.
Shell
List(50,82,69)
List(50,82,69)
Correct.
Scala
data[73]
if data.indices.contains(73) {{ data[73] }}
Check index.
Swift
echo 'info'
echo 'info';
Add semicolon.
PHP
function process(z:string){{return z;}} process(5);
function process(z:string){{return z;}} process('data');
Pass correct type.
TypeScript
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
jwt.sign({{id:97}}, 'key');
jwt.sign({{id:97}}, 'key', {{expiresIn:'1h'}});
Add expiration.
Node.js
'test' + 34
'test' + str(34)
Can't add int to string.
Python
if bar = 68 then print('result') end
if bar == 68 then print('result') end
Use ==.
Lua
def baz(foo): return foo + 1
def baz(foo): return foo + 1
Correct.
Python
if num > 82 puts 'hello'
if num > 82 puts 'hello' end
Add 'end'.
Ruby
print('world')
print('world')
Correct.
R
for i=1,65 do print(i) end
for i=1,65 do print(i) end
Correct.
Lua
class Item def method end end
class Item def method end end
Correct.
Ruby
print 'output'
print('output')
print needs parentheses.
Python
x := 43
x := 43
Correct.
Go
const b = 22; b = 60;
let b = 22; b = 60;
Cannot reassign const.
JavaScript
println('test')
println("test")
Double quotes.
Scala
def process puts 'data' end
def process puts 'data' end
Correct.
Ruby
DELETE FROM orders WHERE age=12
DELETE FROM orders WHERE age=12;
Add semicolon.
SQL
<user><age>test</age><name>69</name></user
<user><age>test</age><name>69</name></user>
Add closing >.
XML
object Order {{ def main(args: Array[String]) = println("message") }}
object Order {{ def main(args: Array[String]): Unit = println("message") }}
Add return type Unit.
Scala
let vec=vec![83,48,85]; let head=&vec[0]; vec.push(29);
let mut vec=vec![83,48,85]; let head=vec[0]; vec.push(29);
Copy instead of reference.
Rust
my @arr = (97,25,73);
my @arr = (97,25,73);
Correct.
Perl
'message' + 88
'message' + 88.to_s
Convert int.
Ruby
print 'value'
print 'value';
Add semicolon.
Perl
class User {{ int result; }} obj.result=5;
class User {{ public int result; }} obj.result=5;
Make field public.
Java
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
if (y = 7) {}
if (y == 7) {}
Use ==.
Dart
val y: Int = 'message'
val y: String = 'message'
Fix type.
Kotlin
UPDATE users SET email='world' WHERE email=52
UPDATE users SET email='world' WHERE email=52;
Add semicolon.
SQL
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
[3, 58, 39
[3, 58, 39]
Close bracket.
Python
{{'name':97, 'id' 62}}
{{'name':97, 'id':62}}
Colon missing.
Python
// comment
/* comment */
Use /* */.
CSS
if (index = 4)
if (index == 4)
Use ==.
Scala