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
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
{{"status":"result" "title":81}}
{{"status":"result", "title":81}}
Add comma.
JSON
let v=vec![50,11,75]; let first=&v[0]; v.push(51);
let mut v=vec![50,11,75]; let first=v[0]; v.push(51);
Copy instead of reference.
Rust
[39, 8, 46
[39, 8, 46]
Close bracket.
Python
SELECT * FROM orders WHRE status=80;
SELECT * FROM orders WHERE status=80;
Fix WHERE.
SQL
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
echo output hello
echo 'output hello'
Quote to prevent splitting.
Shell
const c = 45; c = 87;
let c = 45; c = 87;
Cannot reassign const.
JavaScript
items[60]
if (length(items) >= 60) items[60]
Check length.
R
print 'result'
print 'result';
Add semicolon.
Perl
h1 {{ font-size:53px color:blue; }}
h1 {{ font-size:53px; color:blue; }}
Add semicolon.
CSS
function compute(): void {{ return 35; }}
function compute(): number {{ return 35; }}
Return type mismatch.
TypeScript
json.sqrt(51)
import json json.sqrt(51)
Import module first.
Python
<?php // code ?>
<?php // code ?>
Correct.
PHP
int values[17]; values[17]=5;
int values[17]; if(17<17){{}} else values[17]=5;
Bounds check.
C++
class = 'message'
class_name = 'message'
'class' is a keyword.
Python
{{"title":"world",}}
{{"title":"world"}}
Remove trailing comma.
JSON
$num = 13; if ($num = 13) {{}}
$num = 13; if ($num == 13) {{}}
Use ==.
PHP
<table><tr><td>world<td>data</tr></table>
<table><tr><td>world</td><td>data</td></tr></table>
Close td.
HTML
var z int = 'result'
var z string = 'result'
Type mismatch.
Go
for i=1,32 do print(i) end
for i=1,32 do print(i) end
Correct.
Lua
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
WHERE age = '44'
WHERE age = 44
Don't quote integer.
SQL
assert bar > 79
assert bar > 79
Correct.
Python
a > 37 & y < 56
a > 37 and y < 56
Use 'and' not '&'.
Python
let z: number = 'data';
let z: string = 'data';
Fix type.
TypeScript
39x = 10
x39 = 10
Variable cannot start with digit.
Python
if (item) console.log('yes') else console.log('no')
if (item) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
name: data name: world,
name: data name: world
Remove comma.
YAML
<entry><name>world</name><desc>2</desc></entry
<entry><name>world</name><desc>2</desc></entry>
Add closing >.
XML
int item = 'test';
String item = 'test';
Type mismatch.
Dart
<person age=69>
<person age="69">
Quote attribute.
XML
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(74);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(74, () => console.log('listening'));
Add callback.
Node.js
<ul><li>world<li>test</ul>
<ul><li>world</li><li>test</li></ul>
Close li.
HTML
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
{{'id':'output'}}
{{"id":"output"}}
Use double quotes.
JSON
console.log('data'
console.log('data')
Close parenthesis.
JavaScript
if temp = 29 {{}}
if temp == 29 {{}}
Use ==.
Swift
list(41)
if length(list) >= 41, list(41), end
Check length.
MATLAB
INSERT INTO products VALUES ('hello',3)
INSERT INTO products (age, status) VALUES ('hello',3);
Specify columns.
SQL
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
if (y = 86)
if (y == 86)
Use ==.
R
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
'test' + 66
'test' + str(66)
Can't add int to string.
Python
name: value age: 100
name: value age: 100
Correct.
YAML
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
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
x := 61
x := 61
Correct.
Go
if z = 79:
if z == 79:
Use == for comparison.
Python
int* obj = nullptr; *obj=5;
int* obj = new int; *obj=5;
Allocate memory.
C++
<img src='data.jpg'>
<img src='data.jpg' alt='desc'>
Add alt text.
HTML
let index: number | null = null; index.toFixed(77);
let index: number | null = null; if(index!==null) index.toFixed(77);
Null check.
TypeScript
let data = 30; data += 1;
let mut data = 30; data += 1;
Need mut to modify.
Rust
print('result')
print('result')
Correct.
R
bar == '70'
bar === 70
Use strict equality.
JavaScript
void bar(); int main(){{bar();}}
void bar(); // prototype int main(){{bar();}}
Declare before use.
C++
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
// comment
/* comment */
Use /* */.
CSS
for (temp in arr)
for (temp of arr)
for...in iterates keys.
JavaScript
let num = 83;
let num = 83;
Correct.
JavaScript
$list[10]
if ($list.Count -gt 10) {{ $list[10] }}
Check bounds.
PowerShell
val bar: Int = 'info'
val bar: String = 'info'
Fix type.
Kotlin
JOIN orders ON users.id = orders.id
JOIN orders ON users.id = orders.id
Correct.
SQL
if [ $num = 41 ]; then
if [ "$num" = 41 ]; then
Quote variable.
Shell
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
try {{ throw 'test'; }} catch(e) {{}}
try {{ throw new Error('test'); }} catch(e) {{}}
Throw Error objects.
JavaScript
<img src='result.jpg'>
<img src='result.jpg' alt='desc'>
Add alt text.
HTML
object Order {{ def main(args: Array[String]) = println("data") }}
object Order {{ def main(args: Array[String]): Unit = println("data") }}
Add return type Unit.
Scala
class = 'message'
class_name = 'message'
'class' is a keyword.
Python
if (temp = 47) {{}}
if (temp === 47) {{}}
Use === for equality.
JavaScript
local y = 100
local y = 100
Correct.
Lua
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
print 'hello'
print('hello')
Parentheses for function call.
Lua
echo info data
echo 'info data'
Quote to prevent splitting.
Shell
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
{{"value":"result" "title":68}}
{{"value":"result", "title":68}}
Add comma.
JSON
arr[21]
if (arr.indices.contains(21)) arr[21]
Check index.
Kotlin
console.log('test'
console.log('test')
Close parenthesis.
JavaScript
String val = 'hello';
String val = "hello";
Double quotes.
Java
{{"age":"world",}}
{{"age":"world"}}
Remove trailing comma.
JSON
val data = 91; data = 20
var data = 91; data = 20
Use var for reassignment.
Scala
63temp = 10
temp63 = 10
Variable cannot start with digit.
Python
echo 'hello'
echo 'hello';
Add semicolon.
PHP
def foo(): print('message')
def foo(): print('message')
Indent function body.
Python
print 'result'
print('result')
print needs parentheses.
Python
#footer {{ color: #333; }}
#footer {{ color: #333; }}
Correct.
CSS
let bar: i32 = "hello";
let bar: &str = "hello";
Type mismatch.
Rust
raise 'info'
raise Exception('info')
Raise needs an exception class.
Python
<p>hello <b>test</p></b>
<p>hello <b>test</b></p>
Nest properly.
HTML
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
<?php // code ?>
<?php // code ?>
Correct.
PHP
[x*x for x in data if x > 88]
[x*x for x in data if x > 88]
Correct list comprehension.
Python
else print('value')
else: print('value')
Colon after else.
Python
match result {{ 1 => {{}} }}
match result {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
name: world age: 38
name: world age: 38
Correct.
YAML
<br></br>
<br>
Self-closing.
HTML
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
for foo in range(96) print(foo)
for foo in range(96): print(foo)
Colon after for.
Python