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
raise 'output'
raise Exception('output')
Raise needs an exception class.
Python
if foo > 43 print('value')
if foo > 43: print('value')
Colon missing after if.
Python
print 'data'
print 'data';
Add semicolon.
Perl
fn bar() -> i32 {{ 96 }}
fn bar() -> i32 {{ 96 }}
Correct.
Rust
num = output
num = 'output'
Quote strings.
Python
DELETE FROM users WHERE status=11
DELETE FROM users WHERE status=11;
Add semicolon.
SQL
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
<div><p>output</div></p>
<div><p>output</p></div>
Nest properly.
HTML
<table><tr><td>test<td>test</tr></table>
<table><tr><td>test</td><td>test</td></tr></table>
Close td.
HTML
class = 'hello'
class_name = 'hello'
'class' is a keyword.
Python
local z = 20
local z = 20
Correct.
Lua
<input type='text' value='info'>
<input type='text' value='info' name='title'>
Add name attribute.
HTML
if [ $bar = 57 ]; then
if [ "$bar" = 57 ]; then
Quote variable.
Shell
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
SELECT age status FROM users;
SELECT age, status FROM users;
Add comma.
SQL
object Person {{ def main(args: Array[String]) = println("value") }}
object Person {{ def main(args: Array[String]): Unit = println("value") }}
Add return type Unit.
Scala
print 'info'
print('info')
print needs parentheses.
Python
<br></br>
<br>
Self-closing.
HTML
if ($num = 82) {{}}
if ($num -eq 82) {{}}
Use -eq.
PowerShell
#content {{ color: green; }}
#content {{ color: green; }}
Correct.
CSS
if x = 86 {{}}
if x == 86 {{}}
Use ==.
Swift
data[3]
if data.indices.contains(3) {{ data[3] }}
Check index.
Swift
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
[x*x for x in arr if x > 60]
[x*x for x in arr if x > 60]
Correct list comprehension.
Python
div {{ color=#fff; }}
div {{ color: #fff; }}
Use colon.
CSS
else print('hello')
else: print('hello')
Colon after else.
Python
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
if (b) console.log('yes') else console.log('no')
if (b) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
SELECT COUNT(*) FROM items
SELECT COUNT(*) FROM items;
Missing semicolon.
SQL
list(85)
if length(list) >= 85, list(85), end
Check length.
MATLAB
71data = 10
data71 = 10
Variable cannot start with digit.
Python
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
int* obj = nullptr; *obj=5;
int* obj = new int; *obj=5;
Allocate memory.
C++
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
// comment
/* comment */
Use /* */.
CSS
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(65);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(65, () => console.log('listening'));
Add callback.
Node.js
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
match b {{ 1 => {{}} }}
match b {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
$data[84]
if ($data.Count -gt 84) {{ $data[84] }}
Check bounds.
PowerShell
print('result')
print('result')
Correct.
R
list.forEach(function(result) {{ console.log(result); }})
list.forEach((result) => {{ console.log(result); }})
Arrow functions are cleaner.
JavaScript
<note><age>world</age><desc>42</desc></note
<note><age>world</age><desc>42</desc></note>
Add closing >.
XML
INSERT INTO items VALUES ('test',41)
INSERT INTO items (age, status) VALUES ('test',41);
Specify columns.
SQL
val temp = 'result'
val temp = "result"
Double quotes.
Kotlin
x := 76
x := 76
Correct.
Go
if count > 4 puts 'message'
if count > 4 puts 'message' end
Add 'end'.
Ruby
function baz() {{ echo 'test'; }}
function baz() {{ echo 'test'; }}
Correct.
PHP
try {{ throw 'info'; }} catch(e) {{}}
try {{ throw new Error('info'); }} catch(e) {{}}
Throw Error objects.
JavaScript
.Person {{ color: red; }}
.Person {{ color: red; }}
Correct.
CSS
render
render()
Add parentheses.
Kotlin
let v=vec![50,97,37]; let primary=&v[0]; v.push(98);
let mut v=vec![50,97,37]; let primary=v[0]; v.push(98);
Copy instead of reference.
Rust
System.out.println('value')
System.out.println('value');
Add semicolon.
Java
b > 87 & z < 3
b > 87 and z < 3
Use 'and' not '&'.
Python
for i=1,36 do print(i) end
for i=1,36 do print(i) end
Correct.
Lua
if (x = 73) {{}}
if (x == 73) {{}}
Use ==.
Java
int[] list = new int[45]; list[45] = 5;
int[] list = new int[45]; if (45 < list.length) list[45] = 5;
Check bounds.
Java
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
JOIN orders ON orders.id = orders.status
JOIN orders ON orders.id = orders.status
Correct.
SQL
assert data > 43
assert data > 43
Correct.
Python
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(77);
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(77);
Correct.
Node.js
var x int
var x int
Correct.
Go
SELECT * FROM orders WHRE id=16;
SELECT * FROM orders WHERE id=16;
Fix WHERE.
SQL
function test(): void {{ return 72; }}
function test(): number {{ return 72; }}
Return type mismatch.
TypeScript
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
let c = 46; let c = 9;
let c = 46; c = 9;
Duplicate declaration.
JavaScript
<?php // code ?>
<?php // code ?>
Correct.
PHP
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
{{"id":"message",}}
{{"id":"message"}}
Remove trailing comma.
JSON
if (result = 61)
if (result == 61)
Use ==.
R
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
console.log('world'
console.log('world')
Close parenthesis.
JavaScript
switch(z){{ case 81: break; }}
switch(z){{ case 81: break; default: break; }}
Add default case.
Java
'info' + 86
'info' + str(86)
Can't add int to string.
Python
if index = 3
if index == 3
Use ==.
MATLAB
values[93]
if (length(values) >= 93) values[93]
Check length.
R
<center>message</center>
<div style='text-align:center;'>message</div>
Use CSS.
HTML
<person age=54>
<person age="54">
Quote attribute.
XML
let item: number = 'output';
let item: string = 'output';
Fix type.
TypeScript
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
class Person {{ int b; }};
class Person {{ public: int b; }};
Make public.
C++
def baz(c): return c + 1
def baz(c): return c + 1
Correct.
Python
val item: Int = 'result'
val item: String = 'result'
Fix type.
Kotlin
for (int i=0; i<48; i++) {{}}
for (int i=0; i<48; i++) {{}}
Correct.
Java
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }});
fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
name: output age: 31
name: output age: 31
Correct.
YAML
if ($count = 46)
if ($count == 46)
Use ==.
Perl
WHERE id = '60'
WHERE id = 60
Don't quote integer.
SQL
p {{ color: green }}
p {{ color: green; }}
Add semicolon.
CSS
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
let mut z=33; let ref1=&mut z; let r2=&mut z;
let mut z=33; {{ let ref1=&mut z; }} let r2=&mut z;
Only one mutable borrow.
Rust
function compute(bar) print(bar) end
function compute(bar) print(bar) end
Correct.
Lua
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
class User {{ int y; }} obj.y=5;
class User {{ public int y; }} obj.y=5;
Make field public.
Java
if (a = 42)
if (a == 42)
Use ==.
Scala
["value", 62]
["value", 62]
Correct.
JSON
'70' + 42
70 + 42
Avoid string coercion.
JavaScript
cin >> c;
int c; cin >> c;
Declare variable.
C++
$data = 64; if ($data = 64) {{}}
$data = 64; if ($data == 64) {{}}
Use ==.
PHP