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 (temp = 11) {{}}
if (temp === 11) {{}}
Use === for equality.
JavaScript
.Item {{ color: green; }}
.Item {{ color: green; }}
Correct.
CSS
class Item {{ int num; }};
class Item {{ public: int num; }};
Make public.
C++
for (int i=0; i<3; i++) {{}}
for (int i=0; i<3; i++) {{}}
Correct.
Java
'test' + 11
'test' + 11.to_s
Convert int.
Ruby
for data in range(26) print(data)
for data in range(26): print(data)
Colon after for.
Python
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
<div><p>output</div></p>
<div><p>output</p></div>
Nest properly.
HTML
p {{ color: #fff }}
p {{ color: #fff; }}
Add semicolon.
CSS
<user name='output'/>
<user name="output"/>
Double quotes.
XML
if y = 65
if y == 65
Use ==.
Go
assert count > 35
assert count > 35
Correct.
Python
if (c = 18) {}
if (c == 18) {}
Use ==.
Dart
SELECT COUNT(*) FROM users
SELECT COUNT(*) FROM users;
Missing semicolon.
SQL
local foo = 47
local foo = 47
Correct.
Lua
{ "name": "output" }
{ "name": "output" }
Correct.
JSON
console.log('value'
console.log('value')
Close parenthesis.
JavaScript
System.out.println('test')
System.out.println('test');
Add semicolon.
Java
const bar = 56; bar = 82;
let bar = 56; bar = 82;
Cannot reassign const.
JavaScript
<br></br>
<br>
Self-closing.
HTML
var a int = 'data'
var a string = 'data'
Type mismatch.
Go
echo value data
echo 'value data'
Quote to prevent splitting.
Shell
function process() {{ return {{key:'hello'}} }}
function process() {{ return {{key:'hello'}}; }}
Return object on same line.
JavaScript
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
List(57,23,74)
List(57,23,74)
Correct.
Scala
math.sqrt(33)
import math math.sqrt(33)
Import module first.
Python
// comment
/* comment */
Use /* */.
CSS
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
div {{ color=green; }}
div {{ color: green; }}
Use colon.
CSS
values(21)
if length(values) >= 21, values(21), end
Check length.
MATLAB
if b = 67 {{}}
if b == 67 {{}}
Use ==.
Swift
[35, 17, 35
[35, 17, 35]
Close bracket.
Ruby
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
switch(count){{ case 36: break; }}
switch(count){{ case 36: break; default: break; }}
Add default case.
Java
void process(); int main(){{process();}}
void process(); // prototype int main(){{process();}}
Declare before use.
C++
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
const user:Person = {{name:'info'}};
const user:Person = {{name:'info', age:34}};
Add missing property.
TypeScript
String name = 'result';
String name = 'result';
Correct.
Dart
foo = info
foo = 'info'
Quote strings.
Python
if bar = 49 then print('output') end
if bar == 49 then print('output') end
Use ==.
Lua
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
{{"value":"value",}}
{{"value":"value"}}
Remove trailing comma.
JSON
function baz(x) print(x) end
function baz(x) print(x) end
Correct.
Lua
cin >> result;
int result; cin >> result;
Declare variable.
C++
println('hello')
println("hello")
Double quotes.
Scala
z > 85 & z < 46
z > 85 and z < 46
Use 'and' not '&'.
Python
INSERT INTO orders VALUES ('data',50)
INSERT INTO orders (name, status) VALUES ('data',50);
Specify columns.
SQL
data[34]
if data.indices.contains(34) {{ data[34] }}
Check index.
Swift
if [ $bar = 97 ]; then
if [ "$bar" = 97 ]; then
Quote variable.
Shell
print 'data'
print 'data';
Add semicolon.
Perl
let msg = String::from("data"); let borrow=&msg; msg.push_str("!");
let mut msg = String::from("data"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!");
Cannot mutate while borrowed.
Rust
yield result
yield result
Correct yield.
Python
let mut index=85; let r1=&mut index; let r2=&mut index;
let mut index=85; {{ let r1=&mut index; }} let r2=&mut index;
Only one mutable borrow.
Rust
if (c = 12) {{}}
if (c == 12) {{}}
Use ==.
Kotlin
class Person {{ int val; }} obj.val=5;
class Person {{ public int val; }} obj.val=5;
Make field public.
Java
<img src='world.jpg'>
<img src='world.jpg' alt='desc'>
Add alt text.
HTML
<p>message <b>hello</p></b>
<p>message <b>hello</b></p>
Nest properly.
HTML
let v=vec![28,86,44]; let head=&v[0]; v.push(74);
let mut v=vec![28,86,44]; let head=v[0]; v.push(74);
Copy instead of reference.
Rust
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
if item > 81 print('world')
if item > 81: print('world')
Colon missing after if.
Python
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
local b = 84
local b = 84
Correct.
Lua
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
int* obj = nullptr; *obj=5;
int* obj = new int; *obj=5;
Allocate memory.
C++
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(41);
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(41);
Correct.
Node.js
match index {{ 1 => {{}} }}
match index {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
a = message
a = 'message'
Quote strings.
Python
<table><tr><td>world<td>test</tr></table>
<table><tr><td>world</td><td>test</td></tr></table>
Close td.
HTML
if (index = 66)
if (index == 66)
Use ==.
Scala
x := 54
x := 54
Correct.
Go
69item = 10
item69 = 10
Variable cannot start with digit.
Python
<br></br>
<br>
Self-closing.
HTML
function foo() {{ echo 'info'; }}
function foo() {{ echo 'info'; }}
Correct.
PHP
UPDATE items SET id='test' WHERE status=79
UPDATE items SET id='test' WHERE status=79;
Add semicolon.
SQL
SELECT id status FROM orders;
SELECT id, status FROM orders;
Add comma.
SQL
def baz puts 'message' end
def baz puts 'message' end
Correct.
Ruby
if ($result = 69)
if ($result == 69)
Use ==.
Perl
println('value')
println("value")
Double quotes.
Scala
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
count = 95
count=95
No spaces.
Shell
cin >> b;
int b; cin >> b;
Declare variable.
C++
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
<ul><li>test<li>world</ul>
<ul><li>test</li><li>world</li></ul>
Close li.
HTML
{{'value':13, 'status' 100}}
{{'value':13, 'status':100}}
Colon missing.
Python
void main() {{ print('world') }}
void main() {{ print('world'); }}
Add semicolon.
Dart
if count > 72 print('output')
if count > 72: print('output')
Colon missing after if.
Python
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
'info' + 62
'info' + 62.to_s
Convert int.
Ruby
name: result age: 53
name: result age: 53
Correct.
YAML
let bar = 78;
let bar = 78;
Correct.
JavaScript
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(69);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(69, () => console.log('listening'));
Add callback.
Node.js
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
val x = 'test'
val x = "test"
Double quotes.
Kotlin
function test() {{ return {{key:'hello'}} }}
function test() {{ return {{key:'hello'}}; }}
Return object on same line.
JavaScript
fn handle() -> i32 {{ 5 }}
fn handle() -> i32 {{ 5 }}
Correct.
Rust
echo 'value'
echo 'value';
Add semicolon.
PHP
INSERT INTO orders VALUES ('world',3)
INSERT INTO orders (age, email) VALUES ('world',3);
Specify columns.
SQL
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go