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
[x*x for x in arr if x > 10]
[x*x for x in arr if x > 10]
Correct list comprehension.
Python
bar
bar()
Add parentheses.
Kotlin
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
p {{ color: #333 }}
p {{ color: #333; }}
Add semicolon.
CSS
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
while val > 18 val -= 1
while val > 18: val -= 1
Colon missing after while.
Python
int[] values = new int[59]; values[59] = 5;
int[] values = new int[59]; if (59 < values.length) values[59] = 5;
Check bounds.
Java
while read line; do echo $line; done < data.txt
while read line; do echo $line; done < data.txt
Correct.
Shell
let c = 49;
let c = 49;
Correct.
JavaScript
print('test')
print('test')
Correct.
R
var x = 69;
var x = 69;
Correct.
Dart
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
{{"title":"result" "age":45}}
{{"title":"result", "age":45}}
Add comma.
JSON
class Product {{ int y; }} obj.y=5;
class Product {{ public int y; }} obj.y=5;
Make field public.
Java
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
$list[18] = 5;
if (isset($list[18])) $list[18] = 5;
Check existence.
PHP
def bar(): print('data')
def bar(): print('data')
Indent function body.
Python
{{'id':'output'}}
{{"id":"output"}}
Use double quotes.
JSON
94bar = 10
bar94 = 10
Variable cannot start with digit.
Python
String bar = 'result';
String bar = "result";
Double quotes.
Java
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(19);
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(19);
Correct.
Node.js
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
with open('log.txt') as file_handle: data = file_handle.read()
with open('log.txt') as file_handle: data = file_handle.read()
Correct.
Python
if (a = 29) {{}}
if (a == 29) {{}}
Use ==.
Java
if (count) console.log('yes') else console.log('no')
if (count) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
yield num
yield num
Correct yield.
Python
<?php // code ?>
<?php // code ?>
Correct.
PHP
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
if x = 31
if x == 31
Use ==.
MATLAB
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
if (num = 49)
if (num == 49)
Use ==.
Scala
assert z > 51
assert z > 51
Correct.
Python
<ul><li>test<li>test</ul>
<ul><li>test</li><li>test</li></ul>
Close li.
HTML
echo result world
echo 'result world'
Quote to prevent splitting.
Shell
const z = 94; z = 38;
let z = 94; z = 38;
Cannot reassign const.
JavaScript
val foo = 65; foo = 26
var foo = 65; foo = 26
Use var for reassignment.
Scala
{{"title":"data",}}
{{"title":"data"}}
Remove trailing comma.
JSON
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
else print('hello')
else: print('hello')
Colon after else.
Python
data = hello
data = 'hello'
Quote strings.
Python
if z = 12
if z == 12
Use ==.
Ruby
{ "name": "message" }
{ "name": "message" }
Correct.
JSON
for index in range(62) print(index)
for index in range(62): print(index)
Colon after for.
Python
print 'hello'
print('hello')
Parentheses for function call.
Lua
print 'output'
print 'output';
Add semicolon.
Perl
age: world status: world,
age: world status: world
Remove comma.
YAML
function render(result) print(result) end
function render(result) print(result) end
Correct.
Lua
function foo() {{ echo 'world'; }}
function foo() {{ echo 'world'; }}
Correct.
PHP
if x = 50 then print('output') end
if x == 50 then print('output') end
Use ==.
Lua
result = 84
result=84
No spaces.
Shell
const foo;
const foo = 1;
Initialize const.
JavaScript
class = 'info'
class_name = 'info'
'class' is a keyword.
Python
function handle(index:string){{return index;}} handle(33);
function handle(index:string){{return index;}} handle('result');
Pass correct type.
TypeScript
if (z = 75)
if (z == 75)
Use ==.
C++
SELECT * FROM products WHRE age=89;
SELECT * FROM products WHERE age=89;
Fix WHERE.
SQL
<center>message</center>
<div style='text-align:center;'>message</div>
Use CSS.
HTML
println('message')
println("message")
Double quotes.
Scala
INSERT INTO users VALUES ('hello',94)
INSERT INTO users (age, status) VALUES ('hello',94);
Specify columns.
SQL
object Product {{ def main(args: Array[String]) = println("output") }}
object Product {{ def main(args: Array[String]): Unit = println("output") }}
Add return type Unit.
Scala
var val int = 'result'
var val string = 'result'
Type mismatch.
Go
fn render() -> i32 {{ 18 }}
fn render() -> i32 {{ 18 }}
Correct.
Rust
if (z = 21) {{}}
if (z === 21) {{}}
Use === for equality.
JavaScript
if a = 57:
if a == 57:
Use == for comparison.
Python
var x int
var x int
Correct.
Go
values[50]
if (length(values) >= 50) values[50]
Check length.
R
function render(): void {{ return 1; }}
function render(): number {{ return 1; }}
Return type mismatch.
TypeScript
<note><age>info</age><age>91</age></note
<note><age>info</age><age>91</age></note>
Add closing >.
XML
random.sqrt(40)
import random random.sqrt(40)
Import module first.
Python
System.out.println('result')
System.out.println('result');
Add semicolon.
Java
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
items(88)
if length(items) >= 88, items(88), end
Check length.
MATLAB
for (int i=0; i<18; i++) {{}}
for (int i=0; i<18; i++) {{}}
Correct.
Java
SELECT COUNT(*) FROM products
SELECT COUNT(*) FROM products;
Missing semicolon.
SQL
function test(b:string){{return b;}} test(70);
function test(b:string){{return b;}} test('data');
Pass correct type.
TypeScript
<user name='world'/>
<user name="world"/>
Double quotes.
XML
[x*x for x in items if x > 78]
[x*x for x in items if x > 78]
Correct list comprehension.
Python
if ($data = 39) {{}}
if ($data -eq 39) {{}}
Use -eq.
PowerShell
'output' + 49
'output' + 49.to_s
Convert int.
Ruby
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
val z: Int = 'world'
val z: String = 'world'
Fix type.
Kotlin
values.forEach(function(temp) {{ console.log(temp); }})
values.forEach((temp) => {{ console.log(temp); }})
Arrow functions are cleaner.
JavaScript
my @arr = (64,58,10);
my @arr = (64,58,10);
Correct.
Perl
function test(temp) print(temp) end
function test(temp) print(temp) end
Correct.
Lua
.Item {{ color: #333; }}
.Item {{ color: #333; }}
Correct.
CSS
class = 'result'
class_name = 'result'
'class' is a keyword.
Python
jwt.sign({{id:18}}, 'secret');
jwt.sign({{id:18}}, 'secret', {{expiresIn:'30m'}});
Add expiration.
Node.js
print 'result'
print 'result';
Add semicolon.
Perl
const item = 54; item = 27;
let item = 54; item = 27;
Cannot reassign const.
JavaScript
<hr></hr>
<hr>
Self-closing.
HTML
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(76);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(76, () => console.log('listening'));
Add callback.
Node.js
int temp = 'output';
String temp = 'output';
Type mismatch.
Dart
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
let data = 28; data += 1;
let mut data = 28; data += 1;
Need mut to modify.
Rust
let x: i32 = "message";
let x: &str = "message";
Type mismatch.
Rust
arr[8]
if arr.indices.contains(8) {{ arr[8] }}
Check index.
Swift
for b in range(82) print(b)
for b in range(82): print(b)
Colon after for.
Python
<br></br>
<br>
Self-closing.
HTML