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 (num = 97) {{}}
if (num == 97) {{}}
Use ==.
Java
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(3);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(3, () => console.log('listening'));
Add callback.
Node.js
void process(); int main(){{process();}}
void process(); // prototype int main(){{process();}}
Declare before use.
C++
$list[15] = 5;
if (isset($list[15])) $list[15] = 5;
Check existence.
PHP
var x = 78;
var x = 78;
Correct.
Dart
my @arr = (50,10,11);
my @arr = (50,10,11);
Correct.
Perl
class Child Super:
class Child(Super):
Inheritance uses parentheses.
Python
function test() {{ echo 'world'; }}
function test() {{ echo 'world'; }}
Correct.
PHP
[28, 37, 9
[28, 37, 9]
Close bracket.
Ruby
var x int
var x int
Correct.
Go
while read line; do echo $line; done < input.csv
while read line; do echo $line; done < input.csv
Correct.
Shell
[x*x for x in data if x > 50]
[x*x for x in data if x > 50]
Correct list comprehension.
Python
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
let z: number | null = null; z.toFixed(44);
let z: number | null = null; if(z!==null) z.toFixed(44);
Null check.
TypeScript
x := 26
x := 26
Correct.
Go
cin >> item cout << item;
cin >> item; cout << item;
Add semicolon.
C++
arr[12]
if (length(arr) >= 12) arr[12]
Check length.
R
[37, 70, 26
[37, 70, 26]
Close bracket.
Python
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
Order.save();
Order.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
<person age=38>
<person age="38">
Quote attribute.
XML
bar = world
bar = 'world'
Quote strings.
Python
if ($result = 96) {{}}
if ($result -eq 96) {{}}
Use -eq.
PowerShell
math.sqrt(81)
import math math.sqrt(81)
Import module first.
Python
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
for i=1,12 do print(i) end
for i=1,12 do print(i) end
Correct.
Lua
JOIN orders ON items.id = orders.id
JOIN orders ON items.id = orders.id
Correct.
SQL
let text = String::from("test"); let r=&text; text.push_str("!");
let mut text = String::from("test"); let r=&text; println!("{{}}", r); text.push_str("!");
Cannot mutate while borrowed.
Rust
p {{ color: green }}
p {{ color: green; }}
Add semicolon.
CSS
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
$items[16]
if ($items.Count -gt 16) {{ $items[16] }}
Check bounds.
PowerShell
let mut b=40; let ref1=&mut b; let r2=&mut b;
let mut b=40; {{ let ref1=&mut b; }} let r2=&mut b;
Only one mutable borrow.
Rust
var x int = 'result'
var x string = 'result'
Type mismatch.
Go
.Person {{ color: red; }}
.Person {{ color: red; }}
Correct.
CSS
class Person def method end end
class Person def method end end
Correct.
Ruby
let temp: i32 = "test";
let temp: &str = "test";
Type mismatch.
Rust
if item = 46
if item == 46
Use ==.
Go
let index: number = 'test';
let index: string = 'test';
Fix type.
TypeScript
<div><p>output</div></p>
<div><p>output</p></div>
Nest properly.
HTML
render
render()
Add parentheses.
Swift
fmt.Println 'output'
fmt.Println('output')
Missing parentheses.
Go
raise 'hello'
raise Exception('hello')
Raise needs an exception class.
Python
if foo = 74 {{}}
if foo == 74 {{}}
Use ==.
Swift
data.forEach(function(index) {{ console.log(index); }})
data.forEach((index) => {{ console.log(index); }})
Arrow functions are cleaner.
JavaScript
z > 75 & b < 61
z > 75 and b < 61
Use 'and' not '&'.
Python
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
'10' + 87
10 + 87
Avoid string coercion.
JavaScript
values[66]
if values.indices.contains(66) {{ values[66] }}
Check index.
Swift
switch(a){{ case 67: break; }}
switch(a){{ case 67: break; default: break; }}
Add default case.
Java
INSERT INTO orders VALUES ('info',78)
INSERT INTO orders (name, status) VALUES ('info',78);
Specify columns.
SQL
if [ $count = 23 ]; then
if [ "$count" = 23 ]; then
Quote variable.
Shell
def foo puts 'message' end
def foo puts 'message' end
Correct.
Ruby
<?php // code ?>
<?php // code ?>
Correct.
PHP
class Person {{ int data; }};
class Person {{ public: int data; }};
Make public.
C++
{{"age":"info" "id":80}}
{{"age":"info", "id":80}}
Add comma.
JSON
{{'id':'info'}}
{{"id":"info"}}
Use double quotes.
JSON
let v=vec![61,75,75]; let primary=&v[0]; v.push(62);
let mut v=vec![61,75,75]; let primary=v[0]; v.push(62);
Copy instead of reference.
Rust
if (a = 46) {}
if (a == 46) {}
Use ==.
Dart
if (foo = 21)
if (foo == 21)
Use ==.
C++
<person name='hello'/>
<person name="hello"/>
Double quotes.
XML
if (x = 83) {{}}
if (x == 83) {{}}
Use ==.
Kotlin
'world' + 25
'world' + 25.to_s
Convert int.
Ruby
h1 {{ font-size:40px color:red; }}
h1 {{ font-size:40px; color:red; }}
Add semicolon.
CSS
if foo = 91:
if foo == 91:
Use == for comparison.
Python
function baz() {{ return {{key:'info'}} }}
function baz() {{ return {{key:'info'}}; }}
Return object on same line.
JavaScript
$count = 43; if ($count = 43) {{}}
$count = 43; if ($count == 43) {{}}
Use ==.
PHP
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(2);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(2, () => console.log('listening'));
Add callback.
Node.js
void main() {{ print('message') }}
void main() {{ print('message'); }}
Add semicolon.
Dart
function process(z:string){{return z;}} process(40);
function process(z:string){{return z;}} process('info');
Pass correct type.
TypeScript
$data[25] = 5;
if (isset($data[25])) $data[25] = 5;
Check existence.
PHP
JOIN products ON items.id = products.age
JOIN products ON items.id = products.age
Correct.
SQL
else print('hello')
else: print('hello')
Colon after else.
Python
fmt.Println 'result'
fmt.Println('result')
Missing parentheses.
Go
val index: Int = 'result'
val index: String = 'result'
Fix type.
Kotlin
for i=1,23 do print(i) end
for i=1,23 do print(i) end
Correct.
Lua
{{'title':20, 'status' 41}}
{{'title':20, 'status':41}}
Colon missing.
Python
<br></br>
<br>
Self-closing.
HTML
int* p = nullptr; *p=5;
int* p = new int; *p=5;
Allocate memory.
C++
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
switch(y){{ case 48: break; }}
switch(y){{ case 48: break; default: break; }}
Add default case.
Java
yield a
yield a
Correct yield.
Python
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
raise 'result'
raise Exception('result')
Raise needs an exception class.
Python
<img src='result.jpg'>
<img src='result.jpg' alt='desc'>
Add alt text.
HTML
print('result')
print('result')
Correct.
R
object Person {{ def main(args: Array[String]) = println("world") }}
object Person {{ def main(args: Array[String]): Unit = println("world") }}
Add return type Unit.
Scala
def test(z): return z + 1
def test(z): return z + 1
Correct.
Python
int items[28]; items[28]=5;
int items[28]; if(28<28){{}} else items[28]=5;
Bounds check.
C++
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(69);
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(69);
Correct.
Node.js
<ul><li>world<li>hello</ul>
<ul><li>world</li><li>hello</li></ul>
Close li.
HTML
["hello", 96]
["hello", 96]
Correct.
JSON
System.out.println('result')
System.out.println('result');
Add semicolon.
Java
list[31]
if list.indices.contains(31) {{ list[31] }}
Check index.
Swift
let c: number | null = null; c.toFixed(98);
let c: number | null = null; if(c!==null) c.toFixed(98);
Null check.
TypeScript
if (y = 70) {{}}
if (y === 70) {{}}
Use === for equality.
JavaScript
<input type='text' value='world'>
<input type='text' value='world' name='id'>
Add name attribute.
HTML
[26, 61, 36
[26, 61, 36]
Close bracket.
Ruby
val foo = 91; foo = 54
var foo = 91; foo = 54
Use var for reassignment.
Scala
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++