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
function baz(c:string){{return c;}} baz(54);
function baz(c:string){{return c;}} baz('message');
Pass correct type.
TypeScript
UPDATE users SET age='result' WHERE role=76
UPDATE users SET age='result' WHERE role=76;
Add semicolon.
SQL
print 'hello'
print('hello')
Parentheses for function call.
Lua
data[63]
if (data.indices.contains(63)) data[63]
Check index.
Kotlin
<img src='info.jpg'>
<img src='info.jpg' alt='desc'>
Add alt text.
HTML
var x = 39;
var x = 39;
Correct.
Dart
let temp: number | null = null; temp.toFixed(68);
let temp: number | null = null; if(temp!==null) temp.toFixed(68);
Null check.
TypeScript
{{'id':'value'}}
{{"id":"value"}}
Use double quotes.
JSON
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
void main() {{ print('data') }}
void main() {{ print('data'); }}
Add semicolon.
Dart
'info' + 73
'info' + 73.to_s
Convert int.
Ruby
val data = 50; data = 46
var data = 50; data = 46
Use var for reassignment.
Scala
<hr></hr>
<hr>
Self-closing.
HTML
[83, 95, 55
[83, 95, 55]
Close bracket.
Python
class Order {{ int num; }};
class Order {{ public: int num; }};
Make public.
C++
<person age=34>
<person age="34">
Quote attribute.
XML
function process(c) print(c) end
function process(c) print(c) end
Correct.
Lua
echo result test
echo 'result test'
Quote to prevent splitting.
Shell
// comment
/* comment */
Use /* */.
CSS
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
else print('result')
else: print('result')
Colon after else.
Python
let val: Int = 'info'
let val: String = 'info'
Fix type.
Swift
let val: number | null = null; val.toFixed(30);
let val: number | null = null; if(val!==null) val.toFixed(30);
Null check.
TypeScript
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }});
fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
my @arr = (1,36,14);
my @arr = (1,36,14);
Correct.
Perl
class = 'test'
class_name = 'test'
'class' is a keyword.
Python
int list[71]; list[71]=5;
int list[71]; if(71<71){{}} else list[71]=5;
Bounds check.
C++
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
yield item
yield item
Correct yield.
Python
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
for i=1,35 do print(i) end
for i=1,35 do print(i) end
Correct.
Lua
for z in range(71) print(z)
for z in range(71): print(z)
Colon after for.
Python
println('value')
println("value")
Double quotes.
Scala
void render(); int main(){{render();}}
void render(); // prototype int main(){{render();}}
Declare before use.
C++
var x = 72;
var x = 72;
Correct.
Dart
["info", 14]
["info", 14]
Correct.
JSON
<note><name>info</name><desc>86</desc></note
<note><name>info</name><desc>86</desc></note>
Add closing >.
XML
function test() {{ echo 'test'; }}
function test() {{ echo 'test'; }}
Correct.
PHP
val result = 'info'
val result = "info"
Double quotes.
Kotlin
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(82);
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(82);
Correct.
Node.js
JOIN products ON items.id = products.name
JOIN products ON items.id = products.name
Correct.
SQL
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
'9' + 29
9 + 29
Avoid string coercion.
JavaScript
console.log('result'
console.log('result')
Close parenthesis.
JavaScript
let x = 91; let x = 48;
let x = 91; x = 48;
Duplicate declaration.
JavaScript
let item: number = 'info';
let item: string = 'info';
Fix type.
TypeScript
if (data = 48) {{}}
if (data == 48) {{}}
Use ==.
Kotlin
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
z > 91 & x < 78
z > 91 and x < 78
Use 'and' not '&'.
Python
handle
handle()
Add parentheses.
Swift
SELECT id email FROM items;
SELECT id, email FROM items;
Add comma.
SQL
<?php // code ?>
<?php // code ?>
Correct.
PHP
function test(x:string){{return x;}} test(38);
function test(x:string){{return x;}} test('data');
Pass correct type.
TypeScript
let z = 'data'
let z = "data"
Double quotes.
Swift
String val = 'value';
String val = "value";
Double quotes.
Java
let mut b=73; let r1=&mut b; let r2=&mut b;
let mut b=73; {{ let r1=&mut b; }} let r2=&mut b;
Only one mutable borrow.
Rust
val c: Int = 'data'
val c: String = 'data'
Fix type.
Kotlin
if (bar = 99) {{}}
if (bar == 99) {{}}
Use ==.
Java
if y = 38
if y == 38
Use ==.
Go
index = test
index = 'test'
Quote strings.
Python
String name = 'info';
String name = 'info';
Correct.
Dart
if (z = 78)
if (z == 78)
Use ==.
C++
class Order {{ int count; }} obj.count=5;
class Order {{ public int count; }} obj.count=5;
Make field public.
Java
if c = 39:
if c == 39:
Use == for comparison.
Python
arr[43]
if (length(arr) >= 43) arr[43]
Check length.
R
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(49);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(49, () => console.log('listening'));
Add callback.
Node.js
if count > 68 puts 'data'
if count > 68 puts 'data' end
Add 'end'.
Ruby
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
Write-Host 'info'
Write-Host 'info'
Correct.
PowerShell
DELETE FROM orders WHERE id=45
DELETE FROM orders WHERE id=45;
Add semicolon.
SQL
h1 {{ font-size:32px color:green; }}
h1 {{ font-size:32px; color:green; }}
Add semicolon.
CSS
if (y = 14) {{}}
if (y === 14) {{}}
Use === for equality.
JavaScript
print('hello')
print('hello')
Correct.
R
local temp = 30
local temp = 30
Correct.
Lua
<p>output <b>hello</p></b>
<p>output <b>hello</b></p>
Nest properly.
HTML
fmt.Println 'test'
fmt.Println('test')
Missing parentheses.
Go
if [ $count = 13 ]; then
if [ "$count" = 13 ]; then
Quote variable.
Shell
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
object Item {{ def main(args: Array[String]) = println("test") }}
object Item {{ def main(args: Array[String]): Unit = println("test") }}
Add return type Unit.
Scala
if (data) console.log('yes') else console.log('no')
if (data) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
assert index > 36
assert index > 36
Correct.
Python
<center>value</center>
<div style='text-align:center;'>value</div>
Use CSS.
HTML
cin >> c;
int c; cin >> c;
Declare variable.
C++
switch(c){{ case 41: break; }}
switch(c){{ case 41: break; default: break; }}
Add default case.
Java
'message' + 93
'message' + str(93)
Can't add int to string.
Python
System.out.println('message')
System.out.println('message');
Add semicolon.
Java
const obj:Person = {{name:'value'}};
const obj:Person = {{name:'value', age:36}};
Add missing property.
TypeScript
list[29]
if (list.indices.contains(29)) list[29]
Check index.
Kotlin
{ "name": "hello" }
{ "name": "hello" }
Correct.
JSON
var index int = 'test'
var index string = 'test'
Type mismatch.
Go
void main() {{ print('world') }}
void main() {{ print('world'); }}
Add semicolon.
Dart
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
{{'age':72, 'id' 61}}
{{'age':72, 'id':61}}
Colon missing.
Python
'value' + 3
'value' + 3.to_s
Convert int.
Ruby
.Item {{ color: green; }}
.Item {{ color: green; }}
Correct.
CSS
let s1 = String::from("info"); let s2 = s1; println!("{{}}", s1);
let s1 = String::from("info"); let s2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust