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
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
<br></br>
<br>
Self-closing.
HTML
{{'name':27, 'age' 83}}
{{'name':27, 'age':83}}
Colon missing.
Python
const p:Person = {{name:'output'}};
const p:Person = {{name:'output', age:17}};
Add missing property.
TypeScript
object User {{ def main(args: Array[String]) = println("data") }}
object User {{ def main(args: Array[String]): Unit = println("data") }}
Add return type Unit.
Scala
<?php // code ?>
<?php // code ?>
Correct.
PHP
if (x = 66)
if (x == 66)
Use ==.
C++
List(34,96,58)
List(34,96,58)
Correct.
Scala
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
class = 'message'
class_name = 'message'
'class' is a keyword.
Python
if (bar = 67)
if (bar == 67)
Use ==.
Scala
assert a > 55
assert a > 55
Correct.
Python
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
let count = 87;
let count = 87;
Correct.
JavaScript
let count = 'info'
let count = "info"
Double quotes.
Swift
{{'age':'message'}}
{{"age":"message"}}
Use double quotes.
JSON
$arr[44] = 5;
if (isset($arr[44])) $arr[44] = 5;
Check existence.
PHP
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
// comment
/* comment */
Use /* */.
CSS
with open('input.csv') as fh: data = fh.read()
with open('input.csv') as fh: data = fh.read()
Correct.
Python
<person age=93>
<person age="93">
Quote attribute.
XML
if val = 50 {{}}
if val == 50 {{}}
Use ==.
Swift
yield data
yield data
Correct yield.
Python
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(94);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(94, () => console.log('listening'));
Add callback.
Node.js
def handle puts 'output' end
def handle puts 'output' end
Correct.
Ruby
<p>world <b>data</p></b>
<p>world <b>data</b></p>
Nest properly.
HTML
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
<div><p>data</div></p>
<div><p>data</p></div>
Nest properly.
HTML
<input type='text' value='value'>
<input type='text' value='value' name='title'>
Add name attribute.
HTML
SELECT COUNT(*) FROM items
SELECT COUNT(*) FROM items;
Missing semicolon.
SQL
for i=1,20 do print(i) end
for i=1,20 do print(i) end
Correct.
Lua
void handle(); int main(){{handle();}}
void handle(); // prototype int main(){{handle();}}
Declare before use.
C++
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
print 'info'
print 'info';
Add semicolon.
Perl
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
let item = 65; item += 1;
let mut item = 65; item += 1;
Need mut to modify.
Rust
list[22]
if (list.indices.contains(22)) list[22]
Check index.
Kotlin
{ "name": "world" }
{ "name": "world" }
Correct.
JSON
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
print 'result'
print('result')
print needs parentheses.
Python
print('value')
print('value')
Correct.
R
if temp = 21 then print('data') end
if temp == 21 then print('data') end
Use ==.
Lua
Write-Host 'message'
Write-Host 'message'
Correct.
PowerShell
int* obj = nullptr; *obj=5;
int* obj = new int; *obj=5;
Allocate memory.
C++
p {{ color: #333 }}
p {{ color: #333; }}
Add semicolon.
CSS
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
if result = 84
if result == 84
Use ==.
Ruby
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
my @arr = (88,31,45);
my @arr = (88,31,45);
Correct.
Perl
void main() {{ print('output') }}
void main() {{ print('output'); }}
Add semicolon.
Dart
handle
handle()
Add parentheses.
Kotlin
if a = 66:
if a == 66:
Use == for comparison.
Python
<img src='value.jpg'>
<img src='value.jpg' alt='desc'>
Add alt text.
HTML
<entry name='info'/>
<entry name="info"/>
Double quotes.
XML
if (c) console.log('yes') else console.log('no')
if (c) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
if ($num = 80)
if ($num == 80)
Use ==.
Perl
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
println('info')
println("info")
Double quotes.
Scala
int arr[32]; arr[32]=5;
int arr[32]; if(32<32){{}} else arr[32]=5;
Bounds check.
C++
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
cin >> val;
int val; cin >> val;
Declare variable.
C++
cin >> index cout << index;
cin >> index; cout << index;
Add semicolon.
C++
let c: Int = 'hello'
let c: String = 'hello'
Fix type.
Swift
const a = 49; a = 62;
let a = 49; a = 62;
Cannot reassign const.
JavaScript
fn render() -> i32 {{ 23 }}
fn render() -> i32 {{ 23 }}
Correct.
Rust
switch(index){{ case 51: break; }}
switch(index){{ case 51: break; default: break; }}
Add default case.
Java
echo data world
echo 'data world'
Quote to prevent splitting.
Shell
def foo(result): return result + 1
def foo(result): return result + 1
Correct.
Python
name: info age: 39
name: info age: 39
Correct.
YAML
String name = 'data';
String name = 'data';
Correct.
Dart
var x int
var x int
Correct.
Go
a = output
a = 'output'
Quote strings.
Python
class Person {{ int foo; }};
class Person {{ public: int foo; }};
Make public.
C++
x := 59
x := 59
Correct.
Go
let str = String::from("value"); let r=&str; str.push_str("!");
let mut str = String::from("value"); let r=&str; println!("{{}}", r); str.push_str("!");
Cannot mutate while borrowed.
Rust
if foo > 22 puts 'world'
if foo > 22 puts 'world' end
Add 'end'.
Ruby
function foo() {{ echo 'message'; }}
function foo() {{ echo 'message'; }}
Correct.
PHP
$values[86]
if ($values.Count -gt 86) {{ $values[86] }}
Check bounds.
PowerShell
var x = 7;
var x = 7;
Correct.
Dart
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
class Child Super:
class Child(Super):
Inheritance uses parentheses.
Python
SELECT id role FROM orders;
SELECT id, role FROM orders;
Add comma.
SQL
'world' + 7
'world' + str(7)
Can't add int to string.
Python
h1 {{ font-size:76px color:#fff; }}
h1 {{ font-size:76px; color:#fff; }}
Add semicolon.
CSS
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
<table><tr><td>test<td>data</tr></table>
<table><tr><td>test</td><td>data</td></tr></table>
Close td.
HTML
if [ $b = 87 ]; then
if [ "$b" = 87 ]; then
Quote variable.
Shell
UPDATE items SET email='hello' WHERE email=94
UPDATE items SET email='hello' WHERE email=94;
Add semicolon.
SQL
let z: number = 'info';
let z: string = 'info';
Fix type.
TypeScript
{{"value":"value" "age":17}}
{{"value":"value", "age":17}}
Add comma.
JSON
print 'hello'
print('hello')
Parentheses for function call.
Lua
let item: number | null = null; item.toFixed(78);
let item: number | null = null; if(item!==null) item.toFixed(78);
Null check.
TypeScript
if result = 100
if result == 100
Use ==.
MATLAB
for (c in items)
for (c of items)
for...in iterates keys.
JavaScript
UPDATE items SET name='data' WHERE email=28
UPDATE items SET name='data' WHERE email=28;
Add semicolon.
SQL
arr(15)
if length(arr) >= 15, arr(15), end
Check length.
MATLAB
cin >> index cout << index;
cin >> index; cout << index;
Add semicolon.
C++
DELETE FROM items WHERE name=13
DELETE FROM items WHERE name=13;
Add semicolon.
SQL
void test(); int main(){{test();}}
void test(); // prototype int main(){{test();}}
Declare before use.
C++