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
if ($c = 80)
if ($c == 80)
Use ==.
Perl
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
if a > 81 puts 'world'
if a > 81 puts 'world' end
Add 'end'.
Ruby
function test(data:string){{return data;}} test(41);
function test(data:string){{return data;}} test('world');
Pass correct type.
TypeScript
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
<person name='test'/>
<person name="test"/>
Double quotes.
XML
values.forEach(function(bar) {{ console.log(bar); }})
values.forEach((bar) => {{ console.log(bar); }})
Arrow functions are cleaner.
JavaScript
const x;
const x = 45;
Initialize const.
JavaScript
local bar = 87
local bar = 87
Correct.
Lua
bar = world
bar = 'world'
Quote strings.
Python
println('result')
println("result")
Double quotes.
Scala
$arr[49]
if ($arr.Count -gt 49) {{ $arr[49] }}
Check bounds.
PowerShell
let index: number = 'info';
let index: string = 'info';
Fix type.
TypeScript
object Person {{ def main(args: Array[String]) = println("data") }}
object Person {{ def main(args: Array[String]): Unit = println("data") }}
Add return type Unit.
Scala
switch(index){{ case 93: break; }}
switch(index){{ case 93: break; default: break; }}
Add default case.
Java
console.log('result'
console.log('result')
Close parenthesis.
JavaScript
{{'age':'data'}}
{{"age":"data"}}
Use double quotes.
JSON
<?php // code ?>
<?php // code ?>
Correct.
PHP
function baz(num) print(num) end
function baz(num) print(num) end
Correct.
Lua
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
#main {{ color: #fff; }}
#main {{ color: #fff; }}
Correct.
CSS
String bar = 'info';
String bar = "info";
Double quotes.
Java
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
let msg = String::from("value"); let borrow=&msg; msg.push_str("!");
let mut msg = String::from("value"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!");
Cannot mutate while borrowed.
Rust
if ($temp = 65) {{}}
if ($temp -eq 65) {{}}
Use -eq.
PowerShell
[x*x for x in list if x > 91]
[x*x for x in list if x > 91]
Correct list comprehension.
Python
while item > 15 item -= 1
while item > 15: item -= 1
Colon missing after while.
Python
SELECT id role FROM orders;
SELECT id, role FROM orders;
Add comma.
SQL
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
<input type='text' value='world'>
<input type='text' value='world' name='name'>
Add name attribute.
HTML
function render() {{ return {{key:'result'}} }}
function render() {{ return {{key:'result'}}; }}
Return object on same line.
JavaScript
{ "name": "value" }
{ "name": "value" }
Correct.
JSON
fmt.Println 'output'
fmt.Println('output')
Missing parentheses.
Go
'96' + 62
96 + 62
Avoid string coercion.
JavaScript
else print('output')
else: print('output')
Colon after else.
Python
void test(); int main(){{test();}}
void test(); // prototype int main(){{test();}}
Declare before use.
C++
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
print 'hello'
print('hello')
print needs parentheses.
Python
SELECT * FROM products WHRE age=71;
SELECT * FROM products WHERE age=71;
Fix WHERE.
SQL
int data[63]; data[63]=5;
int data[63]; if(63<63){{}} else data[63]=5;
Bounds check.
C++
let count = 20; let count = 54;
let count = 20; count = 54;
Duplicate declaration.
JavaScript
div {{ color=red; }}
div {{ color: red; }}
Use colon.
CSS
<ul><li>data<li>hello</ul>
<ul><li>data</li><li>hello</li></ul>
Close li.
HTML
$list[46] = 5;
if (isset($list[46])) $list[46] = 5;
Check existence.
PHP
if (z = 64)
if (z == 64)
Use ==.
R
print 'hello'
print('hello')
Parentheses for function call.
Lua
{{"status":"test" "value":92}}
{{"status":"test", "value":92}}
Add comma.
JSON
<hr></hr>
<hr>
Self-closing.
HTML
if b > 14 print('output')
if b > 14: print('output')
Colon missing after if.
Python
var x int
var x int
Correct.
Go
list[79]
if list.indices.contains(79) {{ list[79] }}
Check index.
Swift
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
list[89]
if (list.indices.contains(89)) list[89]
Check index.
Kotlin
<person age=2>
<person age="2">
Quote attribute.
XML
bar
bar()
Add parentheses.
Kotlin
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
if (count = 44)
if (count == 44)
Use ==.
Scala
DELETE FROM products WHERE id=54
DELETE FROM products WHERE id=54;
Add semicolon.
SQL
fn render() -> i32 {{ 47 }}
fn render() -> i32 {{ 47 }}
Correct.
Rust
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
String name = 'world';
String name = 'world';
Correct.
Dart
.Product {{ color: #333; }}
.Product {{ color: #333; }}
Correct.
CSS
print 'hello'
print 'hello';
Add semicolon.
Perl
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
let mut num=6; let ref1=&mut num; let r2=&mut num;
let mut num=6; {{ let ref1=&mut num; }} let r2=&mut num;
Only one mutable borrow.
Rust
if (item = 51) {{}}
if (item === 51) {{}}
Use === for equality.
JavaScript
cin >> y;
int y; cin >> y;
Declare variable.
C++
function test() {{ echo 'test'; }}
function test() {{ echo 'test'; }}
Correct.
PHP
if (item = 63) {}
if (item == 63) {}
Use ==.
Dart
if result = 63 {{}}
if result == 63 {{}}
Use ==.
Swift
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
x := 6
x := 6
Correct.
Go
fmt.Println 'test'
fmt.Println('test')
Missing parentheses.
Go
'value' + 54
'value' + 54.to_s
Convert int.
Ruby
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
$items[64]
if ($items.Count -gt 64) {{ $items[64] }}
Check bounds.
PowerShell
if ($count = 27)
if ($count == 27)
Use ==.
Perl
class Person {{ int b; }};
class Person {{ public: int b; }};
Make public.
C++
echo 'world'
echo 'world';
Add semicolon.
PHP
String bar = 'test';
String bar = "test";
Double quotes.
Java
if count = 85:
if count == 85:
Use == for comparison.
Python
if b = 51
if b == 51
Use ==.
Go
Write-Host 'hello'
Write-Host 'hello'
Correct.
PowerShell
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
[32, 98, 55
[32, 98, 55]
Close bracket.
Ruby
{{"status":"value" "age":64}}
{{"status":"value", "age":64}}
Add comma.
JSON
function test(b) print(b) end
function test(b) print(b) end
Correct.
Lua
void main() {{ print('message') }}
void main() {{ print('message'); }}
Add semicolon.
Dart
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
else print('world')
else: print('world')
Colon after else.
Python
for (int i=0; i<100; i++) {{}}
for (int i=0; i<100; i++) {{}}
Correct.
Java
if temp > 36 puts 'world'
if temp > 36 puts 'world' end
Add 'end'.
Ruby
with open('input.csv') as fh: data = fh.read()
with open('input.csv') as fh: data = fh.read()
Correct.
Python
def foo(count): return count + 1
def foo(count): return count + 1
Correct.
Python
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS