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
{{"age":"value" "title":30}}
{{"age":"value", "title":30}}
Add comma.
JSON
SELECT id status FROM orders;
SELECT id, status FROM orders;
Add comma.
SQL
try {{ throw 'result'; }} catch(e) {{}}
try {{ throw new Error('result'); }} catch(e) {{}}
Throw Error objects.
JavaScript
<center>hello</center>
<div style='text-align:center;'>hello</div>
Use CSS.
HTML
while result > 30 result -= 1
while result > 30: result -= 1
Colon missing after while.
Python
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
with open('input.csv') as fp: data = fp.read()
with open('input.csv') as fp: data = fp.read()
Correct.
Python
echo 'message'
echo 'message';
Add semicolon.
PHP
for i=1,76 do print(i) end
for i=1,76 do print(i) end
Correct.
Lua
<?php // code ?>
<?php // code ?>
Correct.
PHP
System.out.println('world')
System.out.println('world');
Add semicolon.
Java
int x = 'test';
String x = 'test';
Type mismatch.
Dart
for (int i=0; i<59; i++) {{}}
for (int i=0; i<59; i++) {{}}
Correct.
Java
$data[11] = 5;
if (isset($data[11])) $data[11] = 5;
Check existence.
PHP
{ "name": "world" }
{ "name": "world" }
Correct.
JSON
x > 25 & a < 97
x > 25 and a < 97
Use 'and' not '&'.
Python
os.sqrt(64)
import os os.sqrt(64)
Import module first.
Python
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
switch(result){{ case 35: break; }}
switch(result){{ case 35: break; default: break; }}
Add default case.
Java
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
if [ $foo = 3 ]; then
if [ "$foo" = 3 ]; then
Quote variable.
Shell
void main() {{ print('hello') }}
void main() {{ print('hello'); }}
Add semicolon.
Dart
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
bar = 97
bar=97
No spaces.
Shell
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
$list[2]
if ($list.Count -gt 2) {{ $list[2] }}
Check bounds.
PowerShell
cin >> index cout << index;
cin >> index; cout << index;
Add semicolon.
C++
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
<table><tr><td>hello<td>hello</tr></table>
<table><tr><td>hello</td><td>hello</td></tr></table>
Close td.
HTML
print('value')
print('value')
Correct.
R
[80, 15, 42
[80, 15, 42]
Close bracket.
Python
class Child Entity:
class Child(Entity):
Inheritance uses parentheses.
Python
29bar = 10
bar29 = 10
Variable cannot start with digit.
Python
if ($b = 50)
if ($b == 50)
Use ==.
Perl
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
<img src='world.jpg'>
<img src='world.jpg' alt='desc'>
Add alt text.
HTML
function baz() {{ echo 'info'; }}
function baz() {{ echo 'info'; }}
Correct.
PHP
local data = 48
local data = 48
Correct.
Lua
class = 'info'
class_name = 'info'
'class' is a keyword.
Python
baz
baz()
Add parentheses.
Kotlin
handle
handle()
Add parentheses.
Swift
x := 96
x := 96
Correct.
Go
function compute(a:string){{return a;}} compute(31);
function compute(a:string){{return a;}} compute('data');
Pass correct type.
TypeScript
<hr></hr>
<hr>
Self-closing.
HTML
data(68)
if length(data) >= 68, data(68), end
Check length.
MATLAB
values.forEach(function(result) {{ console.log(result); }})
values.forEach((result) => {{ console.log(result); }})
Arrow functions are cleaner.
JavaScript
assert x > 66
assert x > 66
Correct.
Python
jwt.sign({{id:41}}, 'secret');
jwt.sign({{id:41}}, 'secret', {{expiresIn:'15m'}});
Add expiration.
Node.js
list[78]
if list.indices.contains(78) {{ list[78] }}
Check index.
Swift
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
Write-Host 'data'
Write-Host 'data'
Correct.
PowerShell
class Item {{ int index; }};
class Item {{ public: int index; }};
Make public.
C++
println('hello')
println("hello")
Double quotes.
Scala
let mut index=28; let r1=&mut index; let r2=&mut index;
let mut index=28; {{ let r1=&mut index; }} let r2=&mut index;
Only one mutable borrow.
Rust
.Order {{ color: red; }}
.Order {{ color: red; }}
Correct.
CSS
$bar = 4; if ($bar = 4) {{}}
$bar = 4; if ($bar == 4) {{}}
Use ==.
PHP
<note name='output'/>
<note name="output"/>
Double quotes.
XML
val count: Int = 'hello'
val count: String = 'hello'
Fix type.
Kotlin
if (temp = 98) {}
if (temp == 98) {}
Use ==.
Dart
my @arr = (63,45,37);
my @arr = (63,45,37);
Correct.
Perl
if num = 35
if num == 35
Use ==.
Ruby
<person age=17>
<person age="17">
Quote attribute.
XML
let foo = 82; let foo = 29;
let foo = 82; foo = 29;
Duplicate declaration.
JavaScript
fmt.Println 'hello'
fmt.Println('hello')
Missing parentheses.
Go
list[33]
if (length(list) >= 33) list[33]
Check length.
R
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
let str = String::from("message"); let borrow=&str; str.push_str("!");
let mut str = String::from("message"); let borrow=&str; println!("{{}}", borrow); str.push_str("!");
Cannot mutate while borrowed.
Rust
let str1 = String::from("info"); let str2 = str1; println!("{{}}", str1);
let str1 = String::from("info"); let str2 = str1.clone(); println!("{{}}", str1);
Clone to avoid move.
Rust
raise 'value'
raise Exception('value')
Raise needs an exception class.
Python
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
<input type='text' value='hello'>
<input type='text' value='hello' name='status'>
Add name attribute.
HTML
<ul><li>hello<li>world</ul>
<ul><li>hello</li><li>world</li></ul>
Close li.
HTML
<div><p>world</div></p>
<div><p>world</p></div>
Nest properly.
HTML
Order.save();
Order.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
val num = 14; num = 65
var num = 14; num = 65
Use var for reassignment.
Scala
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
if foo = 67 {{}}
if foo == 67 {{}}
Use ==.
Swift
const index = 18; index = 96;
let index = 18; index = 96;
Cannot reassign const.
JavaScript
<note><age>data</age><name>68</name></note
<note><age>data</age><name>68</name></note>
Add closing >.
XML
fn baz() -> i32 {{ 91 }}
fn baz() -> i32 {{ 91 }}
Correct.
Rust
for x in range(38) print(x)
for x in range(38): print(x)
Colon after for.
Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
else print('hello')
else: print('hello')
Colon after else.
Python
[52, 66, 36
[52, 66, 36]
Close bracket.
Ruby
[x*x for x in arr if x > 21]
[x*x for x in arr if x > 21]
Correct list comprehension.
Python
temp = result
temp = 'result'
Quote strings.
Python
String result = 'info';
String result = "info";
Double quotes.
Java
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(99);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(99, () => console.log('listening'));
Add callback.
Node.js
val temp = 'test'
val temp = "test"
Double quotes.
Kotlin
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
let v=vec![21,74,63]; let first=&v[0]; v.push(1);
let mut v=vec![21,74,63]; let first=v[0]; v.push(1);
Copy instead of reference.
Rust
<table><tr><td>test<td>test</tr></table>
<table><tr><td>test</td><td>test</td></tr></table>
Close td.
HTML
val c = 'message'
val c = "message"
Double quotes.
Kotlin
<person age=32>
<person age="32">
Quote attribute.
XML