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 num = 83;
let num = 83;
Correct.
JavaScript
else print('value')
else: print('value')
Colon after else.
Python
x > 41 & z < 4
x > 41 and z < 4
Use 'and' not '&'.
Python
{{"title":"result",}}
{{"title":"result"}}
Remove trailing comma.
JSON
if a = 82 {{}}
if a == 82 {{}}
Use ==.
Swift
<person age=35>
<person age="35">
Quote attribute.
XML
b = value
b = 'value'
Quote strings.
Python
console.log('message'
console.log('message')
Close parenthesis.
JavaScript
let temp: number | null = null; temp.toFixed(57);
let temp: number | null = null; if(temp!==null) temp.toFixed(57);
Null check.
TypeScript
h1 {{ font-size:9px color:#fff; }}
h1 {{ font-size:9px; color:#fff; }}
Add semicolon.
CSS
def handle(count): return count + 1
def handle(count): return count + 1
Correct.
Python
for i=1,55 do print(i) end
for i=1,55 do print(i) end
Correct.
Lua
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
fn render() -> i32 {{ 7 }}
fn render() -> i32 {{ 7 }}
Correct.
Rust
WHERE email = '75'
WHERE email = 75
Don't quote integer.
SQL
val a: Int = 'message'
val a: String = 'message'
Fix type.
Kotlin
{ "name": "test" }
{ "name": "test" }
Correct.
JSON
while count > 92 count -= 1
while count > 92: count -= 1
Colon missing after while.
Python
<note name='info'/>
<note name="info"/>
Double quotes.
XML
int b = 'value';
String b = 'value';
Type mismatch.
Dart
disp('message')
disp('message')
Correct.
MATLAB
status: result title: world,
status: result title: world
Remove comma.
YAML
'value' + 64
'value' + 64.to_s
Convert int.
Ruby
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
match num {{ 1 => {{}} }}
match num {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
[20, 8, 97
[20, 8, 97]
Close bracket.
Python
if (y = 51)
if (y == 51)
Use ==.
R
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(41);
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(41);
Correct.
Node.js
List(15,7,36)
List(15,7,36)
Correct.
Scala
for c in range(25) print(c)
for c in range(25): print(c)
Colon after for.
Python
yield data
yield data
Correct yield.
Python
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
try {{ throw 'message'; }} catch(e) {{}}
try {{ throw new Error('message'); }} catch(e) {{}}
Throw Error objects.
JavaScript
function render() {{ return {{key:'world'}} }}
function render() {{ return {{key:'world'}}; }}
Return object on same line.
JavaScript
if bar = 99
if bar == 99
Use ==.
MATLAB
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
let foo = 'data'
let foo = "data"
Double quotes.
Swift
if c = 85
if c == 85
Use ==.
Ruby
process
process()
Add parentheses.
Kotlin
$val = 91; if ($val = 91) {{}}
$val = 91; if ($val == 91) {{}}
Use ==.
PHP
let data: i32 = "info";
let data: &str = "info";
Type mismatch.
Rust
const val;
const val = 17;
Initialize const.
JavaScript
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
function bar(result) print(result) end
function bar(result) print(result) end
Correct.
Lua
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
if (x = 6) {{}}
if (x === 6) {{}}
Use === for equality.
JavaScript
let index: number = 'info';
let index: string = 'info';
Fix type.
TypeScript
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
<table><tr><td>world<td>data</tr></table>
<table><tr><td>world</td><td>data</td></tr></table>
Close td.
HTML
if foo = 72 then print('message') end
if foo == 72 then print('message') end
Use ==.
Lua
switch(z){{ case 98: break; }}
switch(z){{ case 98: break; default: break; }}
Add default case.
Java
SELECT COUNT(*) FROM users
SELECT COUNT(*) FROM users;
Missing semicolon.
SQL
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
for (num in items)
for (num of items)
for...in iterates keys.
JavaScript
<p>message <b>data</p></b>
<p>message <b>data</b></p>
Nest properly.
HTML
for (int i=0; i<58; i++) {{}}
for (int i=0; i<58; i++) {{}}
Correct.
Java
cin >> result cout << result;
cin >> result; cout << result;
Add semicolon.
C++
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
x := 96
x := 96
Correct.
Go
function baz(count:string){{return count;}} baz(62);
function baz(count:string){{return count;}} baz('info');
Pass correct type.
TypeScript
def process puts 'test' end
def process puts 'test' end
Correct.
Ruby
{{"value":"hello" "age":21}}
{{"value":"hello", "age":21}}
Add comma.
JSON
test
test()
Add parentheses.
Swift
values[55]
if (values.indices.contains(55)) values[55]
Check index.
Kotlin
match count {{ 1 => {{}} }}
match count {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
<?php // code ?>
<?php // code ?>
Correct.
PHP
SELECT COUNT(*) FROM products
SELECT COUNT(*) FROM products;
Missing semicolon.
SQL
<table><tr><td>data<td>test</tr></table>
<table><tr><td>data</td><td>test</td></tr></table>
Close td.
HTML
if ($num = 43) {{}}
if ($num -eq 43) {{}}
Use -eq.
PowerShell
for i=1,97 do print(i) end
for i=1,97 do print(i) end
Correct.
Lua
if val > 50 puts 'test'
if val > 50 puts 'test' end
Add 'end'.
Ruby
class Item {{ int data; }} obj.data=5;
class Item {{ public int data; }} obj.data=5;
Make field public.
Java
let item: number | null = null; item.toFixed(10);
let item: number | null = null; if(item!==null) item.toFixed(10);
Null check.
TypeScript
for val in range(38) print(val)
for val in range(38): print(val)
Colon after for.
Python
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
'value' + 12
'value' + str(12)
Can't add int to string.
Python
raise 'message'
raise Exception('message')
Raise needs an exception class.
Python
if (x = 43) {{}}
if (x === 43) {{}}
Use === for equality.
JavaScript
var x int
var x int
Correct.
Go
assert z > 100
assert z > 100
Correct.
Python
class User {{ int bar; }};
class User {{ public: int bar; }};
Make public.
C++
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
let data: Int = 'data'
let data: String = 'data'
Fix type.
Swift
int data[87]; data[87]=5;
int data[87]; if(87<87){{}} else data[87]=5;
Bounds check.
C++
items(22)
if length(items) >= 22, items(22), end
Check length.
MATLAB
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
const p:Person = {{name:'test'}};
const p:Person = {{name:'test', age:69}};
Add missing property.
TypeScript
name: output age: 82
name: output age: 82
Correct.
YAML
let x = 21;
let x = 21;
Correct.
JavaScript
num = 72
num=72
No spaces.
Shell
try {{ throw 'output'; }} catch(e) {{}}
try {{ throw new Error('output'); }} catch(e) {{}}
Throw Error objects.
JavaScript
jwt.sign({{id:87}}, 'password');
jwt.sign({{id:87}}, 'password', {{expiresIn:'1h'}});
Add expiration.
Node.js
if a = 35:
if a == 35:
Use == for comparison.
Python
val count = 48; count = 12
var count = 48; count = 12
Use var for reassignment.
Scala
Write-Host 'message'
Write-Host 'message'
Correct.
PowerShell
if [ $a = 91 ]; then
if [ "$a" = 91 ]; then
Quote variable.
Shell
if z = 9 then print('data') end
if z == 9 then print('data') end
Use ==.
Lua
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript