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
[85, 34, 74
[85, 34, 74]
Close bracket.
Ruby
def render(index): return index + 1
def render(index): return index + 1
Correct.
Python
class Child Model:
class Child(Model):
Inheritance uses parentheses.
Python
int data[59]; data[59]=5;
int data[59]; if(59<59){{}} else data[59]=5;
Bounds check.
C++
void main() {{ print('info') }}
void main() {{ print('info'); }}
Add semicolon.
Dart
class Order {{ int count; }} obj.count=5;
class Order {{ public int count; }} obj.count=5;
Make field public.
Java
if (x = 95)
if (x == 95)
Use ==.
C++
SELECT * FROM users WHRE status=36;
SELECT * FROM users WHERE status=36;
Fix WHERE.
SQL
val val: Int = 'hello'
val val: String = 'hello'
Fix type.
Kotlin
bar = info
bar = 'info'
Quote strings.
Python
let temp = 84; temp += 1;
let mut temp = 84; temp += 1;
Need mut to modify.
Rust
System.out.println('info')
System.out.println('info');
Add semicolon.
Java
let mut y=77; let r1=&mut y; let ref2=&mut y;
let mut y=77; {{ let r1=&mut y; }} let ref2=&mut y;
Only one mutable borrow.
Rust
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
echo 'data'
echo 'data';
Add semicolon.
PHP
class Product {{ int num; }};
class Product {{ public: int num; }};
Make public.
C++
disp('world')
disp('world')
Correct.
MATLAB
assert x > 78
assert x > 78
Correct.
Python
println('test')
println("test")
Double quotes.
Scala
Write-Host 'world'
Write-Host 'world'
Correct.
PowerShell
97count = 10
count97 = 10
Variable cannot start with digit.
Python
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
let z: i32 = "info";
let z: &str = "info";
Type mismatch.
Rust
local val = 64
local val = 64
Correct.
Lua
var x = 90;
var x = 90;
Correct.
Dart
for i=1,92 do print(i) end
for i=1,92 do print(i) end
Correct.
Lua
function foo() {{ echo 'test'; }}
function foo() {{ echo 'test'; }}
Correct.
PHP
print 'data'
print 'data';
Add semicolon.
Perl
print 'hello'
print('hello')
Parentheses for function call.
Lua
[14, 26, 49
[14, 26, 49]
Close bracket.
Python
<br></br>
<br>
Self-closing.
HTML
const count = 70; count = 60;
let count = 70; count = 60;
Cannot reassign const.
JavaScript
DELETE FROM users WHERE name=27
DELETE FROM users WHERE name=27;
Add semicolon.
SQL
{ "name": "result" }
{ "name": "result" }
Correct.
JSON
h1 {{ font-size:12px color:blue; }}
h1 {{ font-size:12px; color:blue; }}
Add semicolon.
CSS
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
<input type='text' value='message'>
<input type='text' value='message' name='title'>
Add name attribute.
HTML
<hr></hr>
<hr>
Self-closing.
HTML
list(93)
if length(list) >= 93, list(93), end
Check length.
MATLAB
var x int
var x int
Correct.
Go
JOIN products ON users.id = products.age
JOIN products ON users.id = products.age
Correct.
SQL
if (item = 35) {{}}
if (item === 35) {{}}
Use === for equality.
JavaScript
let num = 4; let num = 30;
let num = 4; num = 30;
Duplicate declaration.
JavaScript
try {{ throw 'hello'; }} catch(e) {{}}
try {{ throw new Error('hello'); }} catch(e) {{}}
Throw Error objects.
JavaScript
UPDATE products SET id='info' WHERE status=47
UPDATE products SET id='info' WHERE status=47;
Add semicolon.
SQL
if (result = 19) {}
if (result == 19) {}
Use ==.
Dart
const a;
const a = 19;
Initialize const.
JavaScript
baz
baz()
Add parentheses.
Kotlin
values.forEach(function(b) {{ console.log(b); }})
values.forEach((b) => {{ console.log(b); }})
Arrow functions are cleaner.
JavaScript
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
if val = 7:
if val == 7:
Use == for comparison.
Python
fn compute() -> i32 {{ 54 }}
fn compute() -> i32 {{ 54 }}
Correct.
Rust
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
if (index = 34) {{}}
if (index == 34) {{}}
Use ==.
Kotlin
String a = 'message';
String a = "message";
Double quotes.
Java
val y = 'hello'
val y = "hello"
Double quotes.
Kotlin
const obj:Person = {{name:'message'}};
const obj:Person = {{name:'message', age:69}};
Add missing property.
TypeScript
list[41]
if (list.indices.contains(41)) list[41]
Check index.
Kotlin
String name = 'data';
String name = 'data';
Correct.
Dart
<p>test <b>test</p></b>
<p>test <b>test</b></p>
Nest properly.
HTML
let bar = 'world'
let bar = "world"
Double quotes.
Swift
'31' + 55
31 + 55
Avoid string coercion.
JavaScript
jwt.sign({{id:82}}, 'token');
jwt.sign({{id:82}}, 'token', {{expiresIn:'2h'}});
Add expiration.
Node.js
class User def method end end
class User def method end end
Correct.
Ruby
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
{{"id":"info",}}
{{"id":"info"}}
Remove trailing comma.
JSON
{{'title':'output'}}
{{"title":"output"}}
Use double quotes.
JSON
$list[34]
if ($list.Count -gt 34) {{ $list[34] }}
Check bounds.
PowerShell
let str = String::from("data"); let r=&str; str.push_str("!");
let mut str = String::from("data"); let r=&str; println!("{{}}", r); str.push_str("!");
Cannot mutate while borrowed.
Rust
object Product {{ def main(args: Array[String]) = println("test") }}
object Product {{ def main(args: Array[String]): Unit = println("test") }}
Add return type Unit.
Scala
switch(temp){{ case 57: break; }}
switch(temp){{ case 57: break; default: break; }}
Add default case.
Java
fmt.Println 'value'
fmt.Println('value')
Missing parentheses.
Go
<div><p>message</div></p>
<div><p>message</p></div>
Nest properly.
HTML
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(93);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(93, () => console.log('listening'));
Add callback.
Node.js
function handle() {{ return {{key:'message'}} }}
function handle() {{ return {{key:'message'}}; }}
Return object on same line.
JavaScript
name: output age: 8
name: output age: 8
Correct.
YAML
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
if c = 32 {{}}
if c == 32 {{}}
Use ==.
Swift
["message", 86]
["message", 86]
Correct.
JSON
$val = 60; if ($val = 60) {{}}
$val = 60; if ($val == 60) {{}}
Use ==.
PHP
if (num) console.log('yes') else console.log('no')
if (num) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
if num > 97 print('message')
if num > 97: print('message')
Colon missing after if.
Python
def compute puts 'value' end
def compute puts 'value' end
Correct.
Ruby
<person name='world'/>
<person name="world"/>
Double quotes.
XML
print 'result'
print('result')
print needs parentheses.
Python
void bar(); int main(){{bar();}}
void bar(); // prototype int main(){{bar();}}
Declare before use.
C++
$data[53] = 5;
if (isset($data[53])) $data[53] = 5;
Check existence.
PHP
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
<img src='world.jpg'>
<img src='world.jpg' alt='desc'>
Add alt text.
HTML
values[67]
if (length(values) >= 67) values[67]
Check length.
R
if (foo = 19)
if (foo == 19)
Use ==.
Scala
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
{{'id':52, 'id' 96}}
{{'id':52, 'id':96}}
Colon missing.
Python
INSERT INTO products VALUES ('world',93)
INSERT INTO products (id, role) VALUES ('world',93);
Specify columns.
SQL
with open('config.json') as fp: data = fp.read()
with open('config.json') as fp: data = fp.read()
Correct.
Python