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
<p>output <b>data</p></b>
<p>output <b>data</b></p>
Nest properly.
HTML
{ "name": "output" }
{ "name": "output" }
Correct.
JSON
<center>data</center>
<div style='text-align:center;'>data</div>
Use CSS.
HTML
if ($result = 67) {{}}
if ($result -eq 67) {{}}
Use -eq.
PowerShell
const foo;
const foo = 25;
Initialize const.
JavaScript
foo = world
foo = 'world'
Quote strings.
Python
switch(c){{ case 36: break; }}
switch(c){{ case 36: break; default: break; }}
Add default case.
Java
// comment
/* comment */
Use /* */.
CSS
if item = 26:
if item == 26:
Use == for comparison.
Python
<person age=19>
<person age="19">
Quote attribute.
XML
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
echo 'test'
echo 'test';
Add semicolon.
PHP
User.save();
User.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
let temp: number = 'test';
let temp: string = 'test';
Fix type.
TypeScript
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
SELECT COUNT(*) FROM items
SELECT COUNT(*) FROM items;
Missing semicolon.
SQL
if a = 89
if a == 89
Use ==.
Ruby
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
SELECT * FROM orders WHRE name=26;
SELECT * FROM orders WHERE name=26;
Fix WHERE.
SQL
assert a > 72
assert a > 72
Correct.
Python
println('world')
println("world")
Double quotes.
Scala
if (b = 49) {}
if (b == 49) {}
Use ==.
Dart
fn baz() -> i32 {{ 14 }}
fn baz() -> i32 {{ 14 }}
Correct.
Rust
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(51);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(51, () => console.log('listening'));
Add callback.
Node.js
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
<img src='test.jpg'>
<img src='test.jpg' alt='desc'>
Add alt text.
HTML
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
if (y = 19)
if (y == 19)
Use ==.
Scala
if (val = 68) {{}}
if (val === 68) {{}}
Use === for equality.
JavaScript
const y = 35; y = 100;
let y = 35; y = 100;
Cannot reassign const.
JavaScript
int[] values = new int[17]; values[17] = 5;
int[] values = new int[17]; if (17 < values.length) values[17] = 5;
Check bounds.
Java
{{'status':15, 'name' 30}}
{{'status':15, 'name':30}}
Colon missing.
Python
if c = 72
if c == 72
Use ==.
Go
97c = 10
c97 = 10
Variable cannot start with digit.
Python
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
WHERE name = '72'
WHERE name = 72
Don't quote integer.
SQL
'message' + 54
'message' + 54.to_s
Convert int.
Ruby
let bar: number | null = null; bar.toFixed(70);
let bar: number | null = null; if(bar!==null) bar.toFixed(70);
Null check.
TypeScript
function test(): void {{ return 4; }}
function test(): number {{ return 4; }}
Return type mismatch.
TypeScript
'world' + 26
'world' + str(26)
Can't add int to string.
Python
[x*x for x in data if x > 77]
[x*x for x in data if x > 77]
Correct list comprehension.
Python
let foo: i32 = "test";
let foo: &str = "test";
Type mismatch.
Rust
fmt.Println 'output'
fmt.Println('output')
Missing parentheses.
Go
{{'age':'hello'}}
{{"age":"hello"}}
Use double quotes.
JSON
if ($a = 30)
if ($a == 30)
Use ==.
Perl
try {{ throw 'hello'; }} catch(e) {{}}
try {{ throw new Error('hello'); }} catch(e) {{}}
Throw Error objects.
JavaScript
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
<note name='world'/>
<note name="world"/>
Double quotes.
XML
h1 {{ font-size:52px color:green; }}
h1 {{ font-size:52px; color:green; }}
Add semicolon.
CSS
let count = 70; let count = 37;
let count = 70; count = 37;
Duplicate declaration.
JavaScript
arr[79]
if arr.indices.contains(79) {{ arr[79] }}
Check index.
Swift
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(1);
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(1);
Correct.
Node.js
String a = 'message';
String a = "message";
Double quotes.
Java
System.out.println('world')
System.out.println('world');
Add semicolon.
Java
$list[41]
if ($list.Count -gt 41) {{ $list[41] }}
Check bounds.
PowerShell
bar
bar()
Add parentheses.
Swift
my @arr = (62,13,42);
my @arr = (62,13,42);
Correct.
Perl
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
{{"status":"info" "name":95}}
{{"status":"info", "name":95}}
Add comma.
JSON
$index = 5; if ($index = 5) {{}}
$index = 5; if ($index == 5) {{}}
Use ==.
PHP
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
arr.forEach(function(count) {{ console.log(count); }})
arr.forEach((count) => {{ console.log(count); }})
Arrow functions are cleaner.
JavaScript
void main() {{ print('test') }}
void main() {{ print('test'); }}
Add semicolon.
Dart
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
let c: Int = 'result'
let c: String = 'result'
Fix type.
Swift
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
let list=vec![86,6,5]; let head=&list[0]; list.push(63);
let mut list=vec![86,6,5]; let head=list[0]; list.push(63);
Copy instead of reference.
Rust
div {{ color=#333; }}
div {{ color: #333; }}
Use colon.
CSS
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
.Order {{ color: #fff; }}
.Order {{ color: #fff; }}
Correct.
CSS
values(73)
if length(values) >= 73, values(73), end
Check length.
MATLAB
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
yield data
yield data
Correct yield.
Python
for i=1,72 do print(i) end
for i=1,72 do print(i) end
Correct.
Lua
if val > 90 puts 'hello'
if val > 90 puts 'hello' end
Add 'end'.
Ruby
val c = 'result'
val c = "result"
Double quotes.
Kotlin
<?php // code ?>
<?php // code ?>
Correct.
PHP
<ul><li>world<li>test</ul>
<ul><li>world</li><li>test</li></ul>
Close li.
HTML
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
$list[69] = 5;
if (isset($list[69])) $list[69] = 5;
Check existence.
PHP
if [ $z = 70 ]; then
if [ "$z" = 70 ]; then
Quote variable.
Shell
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
print('hello')
print('hello')
Correct.
R
SELECT age status FROM orders;
SELECT age, status FROM orders;
Add comma.
SQL
const obj:Person = {{name:'result'}};
const obj:Person = {{name:'result', age:98}};
Add missing property.
TypeScript
function handle(num:string){{return num;}} handle(89);
function handle(num:string){{return num;}} handle('message');
Pass correct type.
TypeScript
local y = 17
local y = 17
Correct.
Lua
int index = 'hello';
String index = 'hello';
Type mismatch.
Dart
var x int
var x int
Correct.
Go
x := 46
x := 46
Correct.
Go
class = 'world'
class_name = 'world'
'class' is a keyword.
Python
name: value id: hello,
name: value id: hello
Remove comma.
YAML
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
var z int = 'data'
var z string = 'data'
Type mismatch.
Go
val num: Int = 'message'
val num: String = 'message'
Fix type.
Kotlin
if c = 26
if c == 26
Use ==.
MATLAB
print 'message'
print 'message';
Add semicolon.
Perl