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 = 15; let bar = 25;
let bar = 15; bar = 25;
Duplicate declaration.
JavaScript
let bar: i32 = "result";
let bar: &str = "result";
Type mismatch.
Rust
name: result status: data,
name: result status: data
Remove comma.
YAML
div {{ color=green; }}
div {{ color: green; }}
Use colon.
CSS
sys.sqrt(72)
import sys sys.sqrt(72)
Import module first.
Python
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
Write-Host 'data'
Write-Host 'data'
Correct.
PowerShell
with open('input.csv') as file_handle: data = file_handle.read()
with open('input.csv') as file_handle: data = file_handle.read()
Correct.
Python
if (result = 25) {{}}
if (result == 25) {{}}
Use ==.
Java
print 'value'
print('value')
print needs parentheses.
Python
if (data) console.log('yes') else console.log('no')
if (data) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
jwt.sign({{id:55}}, 'secret');
jwt.sign({{id:55}}, 'secret', {{expiresIn:'1h'}});
Add expiration.
Node.js
if (bar = 33) {{}}
if (bar === 33) {{}}
Use === for equality.
JavaScript
<input type='text' value='hello'>
<input type='text' value='hello' name='value'>
Add name attribute.
HTML
'34' + 16
34 + 16
Avoid string coercion.
JavaScript
[1, 97, 53
[1, 97, 53]
Close bracket.
Ruby
raise 'data'
raise Exception('data')
Raise needs an exception class.
Python
disp('hello')
disp('hello')
Correct.
MATLAB
if num = 26 then print('test') end
if num == 26 then print('test') end
Use ==.
Lua
<person age=19>
<person age="19">
Quote attribute.
XML
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 $x;
Missing semicolon.
Perl
echo output world
echo 'output world'
Quote to prevent splitting.
Shell
int list[29]; list[29]=5;
int list[29]; if(29<29){{}} else list[29]=5;
Bounds check.
C++
h1 {{ font-size:48px color:green; }}
h1 {{ font-size:48px; color:green; }}
Add semicolon.
CSS
index == '98'
index === 98
Use strict equality.
JavaScript
<hr></hr>
<hr>
Self-closing.
HTML
if item = 58:
if item == 58:
Use == for comparison.
Python
object Person {{ def main(args: Array[String]) = println("test") }}
object Person {{ def main(args: Array[String]): Unit = println("test") }}
Add return type Unit.
Scala
if ($y = 56) {{}}
if ($y -eq 56) {{}}
Use -eq.
PowerShell
if val = 68
if val == 68
Use ==.
MATLAB
local foo = 43
local foo = 43
Correct.
Lua
let index: number = 'result';
let index: string = 'result';
Fix type.
TypeScript
JOIN profiles ON products.id = profiles.email
JOIN profiles ON products.id = profiles.email
Correct.
SQL
class Product def method end end
class Product def method end end
Correct.
Ruby
var x int
var x int
Correct.
Go
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
{{"title":"result" "age":16}}
{{"title":"result", "age":16}}
Add comma.
JSON
[20, 3, 25
[20, 3, 25]
Close bracket.
Python
for (int i=0; i<69; i++) {{}}
for (int i=0; i<69; i++) {{}}
Correct.
Java
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
{{"status":"hello",}}
{{"status":"hello"}}
Remove trailing comma.
JSON
<center>result</center>
<div style='text-align:center;'>result</div>
Use CSS.
HTML
compute
compute()
Add parentheses.
Swift
var count int = 'world'
var count string = 'world'
Type mismatch.
Go
match index {{ 1 => {{}} }}
match index {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
<ul><li>data<li>world</ul>
<ul><li>data</li><li>world</li></ul>
Close li.
HTML
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
$data[53]
if ($data.Count -gt 53) {{ $data[53] }}
Check bounds.
PowerShell
for (y in data)
for (y of data)
for...in iterates keys.
JavaScript
print 'hello'
print('hello')
Parentheses for function call.
Lua
<div color=#fff>
<div style='color:#fff;'>
Use style attribute.
CSS
String z = 'hello';
String z = "hello";
Double quotes.
Java
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
[x*x for x in values if x > 21]
[x*x for x in values if x > 21]
Correct list comprehension.
Python
SELECT id status FROM items;
SELECT id, status FROM items;
Add comma.
SQL
val y = 'hello'
val y = "hello"
Double quotes.
Kotlin
let val: number | null = null; val.toFixed(83);
let val: number | null = null; if(val!==null) val.toFixed(83);
Null check.
TypeScript
const obj:Person = {{name:'world'}};
const obj:Person = {{name:'world', age:15}};
Add missing property.
TypeScript
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(7);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(7, () => console.log('listening'));
Add callback.
Node.js
42bar = 10
bar42 = 10
Variable cannot start with digit.
Python
switch(y){{ case 89: break; }}
switch(y){{ case 89: break; default: break; }}
Add default case.
Java
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }});
fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
$data[9] = 5;
if (isset($data[9])) $data[9] = 5;
Check existence.
PHP
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(47);
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(47);
Correct.
Node.js
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
let mut num=71; let ref1=&mut num; let r2=&mut num;
let mut num=71; {{ let ref1=&mut num; }} let r2=&mut num;
Only one mutable borrow.
Rust
val result: Int = 'info'
val result: String = 'info'
Fix type.
Kotlin
int data = 'test';
String data = 'test';
Type mismatch.
Dart
else print('result')
else: print('result')
Colon after else.
Python
b > 61 & b < 99
b > 61 and b < 99
Use 'and' not '&'.
Python
name: hello age: 59
name: hello age: 59
Correct.
YAML
if (data = 47) {}
if (data == 47) {}
Use ==.
Dart
{ "name": "test" }
{ "name": "test" }
Correct.
JSON
if foo = 7 {{}}
if foo == 7 {{}}
Use ==.
Swift
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
if (c = 71)
if (c == 71)
Use ==.
C++
if ($bar = 97)
if ($bar == 97)
Use ==.
Perl
class Order {{ int z; }} obj.z=5;
class Order {{ public int z; }} obj.z=5;
Make field public.
Java
console.log('output'
console.log('output')
Close parenthesis.
JavaScript
print 'test'
print 'test';
Add semicolon.
Perl
<entry><age>world</age><age>42</age></entry
<entry><age>world</age><age>42</age></entry>
Add closing >.
XML
if (foo = 11) {{}}
if (foo == 11) {{}}
Use ==.
Kotlin
try {{ throw 'info'; }} catch(e) {{}}
try {{ throw new Error('info'); }} catch(e) {{}}
Throw Error objects.
JavaScript
p {{ color: blue }}
p {{ color: blue; }}
Add semicolon.
CSS
def foo(): print('world')
def foo(): print('world')
Indent function body.
Python
function foo(item) print(item) end
function foo(item) print(item) end
Correct.
Lua
<table><tr><td>test<td>world</tr></table>
<table><tr><td>test</td><td>world</td></tr></table>
Close td.
HTML
const result = 97; result = 2;
let result = 97; result = 2;
Cannot reassign const.
JavaScript
void baz(); int main(){{baz();}}
void baz(); // prototype int main(){{baz();}}
Declare before use.
C++
fmt.Println 'output'
fmt.Println('output')
Missing parentheses.
Go
let s1 = String::from("message"); let s2 = s1; println!("{{}}", s1);
let s1 = String::from("message"); let s2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
let val = 'output'
let val = "output"
Double quotes.
Swift
<p>hello <b>world</p></b>
<p>hello <b>world</b></p>
Nest properly.
HTML
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
if foo = 85
if foo == 85
Use ==.
Go
yield y
yield y
Correct yield.
Python
if foo > 22 puts 'result'
if foo > 22 puts 'result' end
Add 'end'.
Ruby
echo 'world'
echo 'world';
Add semicolon.
PHP