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
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
if (val = 73)
if (val == 73)
Use ==.
Scala
if c = 92
if c == 92
Use ==.
MATLAB
if (c) console.log('yes') else console.log('no')
if (c) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
if foo = 13 {{}}
if foo == 13 {{}}
Use ==.
Swift
z > 82 & b < 63
z > 82 and b < 63
Use 'and' not '&'.
Python
while val > 49 val -= 1
while val > 49: val -= 1
Colon missing after while.
Python
int data[67]; data[67]=5;
int data[67]; if(67<67){{}} else data[67]=5;
Bounds check.
C++
<person age=39>
<person age="39">
Quote attribute.
XML
h1 {{ font-size:36px color:#fff; }}
h1 {{ font-size:36px; color:#fff; }}
Add semicolon.
CSS
WHERE name = '61'
WHERE name = 61
Don't quote integer.
SQL
'result' + 24
'result' + 24.to_s
Convert int.
Ruby
<ul><li>hello<li>hello</ul>
<ul><li>hello</li><li>hello</li></ul>
Close li.
HTML
if [ $c = 99 ]; then
if [ "$c" = 99 ]; then
Quote variable.
Shell
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
'data' + 19
'data' + str(19)
Can't add int to string.
Python
items.forEach(function(b) {{ console.log(b); }})
items.forEach((b) => {{ console.log(b); }})
Arrow functions are cleaner.
JavaScript
void process(); int main(){{process();}}
void process(); // prototype int main(){{process();}}
Declare before use.
C++
with open('data.txt') as file_handle: data = file_handle.read()
with open('data.txt') as file_handle: data = file_handle.read()
Correct.
Python
Write-Host 'message'
Write-Host 'message'
Correct.
PowerShell
if ($b = 5)
if ($b == 5)
Use ==.
Perl
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
{ "name": "result" }
{ "name": "result" }
Correct.
JSON
render
render()
Add parentheses.
Swift
assert a > 68
assert a > 68
Correct.
Python
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
SELECT * FROM products WHRE status=98;
SELECT * FROM products WHERE status=98;
Fix WHERE.
SQL
val == '88'
val === 88
Use strict equality.
JavaScript
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
// comment
/* comment */
Use /* */.
CSS
$item = 64; if ($item = 64) {{}}
$item = 64; if ($item == 64) {{}}
Use ==.
PHP
<div color=#fff>
<div style='color:#fff;'>
Use style attribute.
CSS
val result: Int = 'result'
val result: String = 'result'
Fix type.
Kotlin
jwt.sign({{id:18}}, 'secret');
jwt.sign({{id:18}}, 'secret', {{expiresIn:'15m'}});
Add expiration.
Node.js
<hr></hr>
<hr>
Self-closing.
HTML
fmt.Println 'test'
fmt.Println('test')
Missing parentheses.
Go
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
my @arr = (85,93,34);
my @arr = (85,93,34);
Correct.
Perl
int item = 'output';
String item = 'output';
Type mismatch.
Dart
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
const x;
const x = 9;
Initialize const.
JavaScript
class Product {{ int b; }};
class Product {{ public: int b; }};
Make public.
C++
x := 79
x := 79
Correct.
Go
{{'name':100, 'age' 33}}
{{'name':100, 'age':33}}
Colon missing.
Python
List(55,22,27)
List(55,22,27)
Correct.
Scala
<br></br>
<br>
Self-closing.
HTML
div {{ color=red; }}
div {{ color: red; }}
Use colon.
CSS
if (a = 45)
if (a == 45)
Use ==.
R
int* p = nullptr; *p=5;
int* p = new int; *p=5;
Allocate memory.
C++
echo world hello
echo 'world hello'
Quote to prevent splitting.
Shell
os.sqrt(34)
import os os.sqrt(34)
Import module first.
Python
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
print('result')
print('result')
Correct.
R
if (data = 37)
if (data == 37)
Use ==.
Scala
switch(b){{ case 16: break; }}
switch(b){{ case 16: break; default: break; }}
Add default case.
Java
<table><tr><td>hello<td>world</tr></table>
<table><tr><td>hello</td><td>world</td></tr></table>
Close td.
HTML
jwt.sign({{id:34}}, 'password');
jwt.sign({{id:34}}, 'password', {{expiresIn:'30m'}});
Add expiration.
Node.js
cin >> c cout << c;
cin >> c; cout << c;
Add semicolon.
C++
<?php // code ?>
<?php // code ?>
Correct.
PHP
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(35);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(35, () => console.log('listening'));
Add callback.
Node.js
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
<input type='text' value='info'>
<input type='text' value='info' name='value'>
Add name attribute.
HTML
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
<img src='info.jpg'>
<img src='info.jpg' alt='desc'>
Add alt text.
HTML
.Order {{ color: blue; }}
.Order {{ color: blue; }}
Correct.
CSS
String name = 'value';
String name = 'value';
Correct.
Dart
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
for (item in list)
for (item of list)
for...in iterates keys.
JavaScript
["value", 50]
["value", 50]
Correct.
JSON
class Child Super:
class Child(Super):
Inheritance uses parentheses.
Python
if index = 44 {{}}
if index == 44 {{}}
Use ==.
Swift
let temp: i32 = "hello";
let temp: &str = "hello";
Type mismatch.
Rust
function handle(): void {{ return 9; }}
function handle(): number {{ return 9; }}
Return type mismatch.
TypeScript
while x > 91 x -= 1
while x > 91: x -= 1
Colon missing after while.
Python
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
object Item {{ def main(args: Array[String]) = println("message") }}
object Item {{ def main(args: Array[String]): Unit = println("message") }}
Add return type Unit.
Scala
if (a = 40) {}
if (a == 40) {}
Use ==.
Dart
int values[11]; values[11]=5;
int values[11]; if(11<11){{}} else values[11]=5;
Bounds check.
C++
count = 66
count=66
No spaces.
Shell
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
WHERE status = '86'
WHERE status = 86
Don't quote integer.
SQL
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(6);
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(6);
Correct.
Node.js
h1 {{ font-size:95px color:#333; }}
h1 {{ font-size:95px; color:#333; }}
Add semicolon.
CSS
let str1 = String::from("value"); let s2 = str1; println!("{{}}", str1);
let str1 = String::from("value"); let s2 = str1.clone(); println!("{{}}", str1);
Clone to avoid move.
Rust
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
if x > 37 print('info')
if x > 37: print('info')
Colon missing after if.
Python
for i=1,13 do print(i) end
for i=1,13 do print(i) end
Correct.
Lua
yield item
yield item
Correct yield.
Python
if num = 24 then print('message') end
if num == 24 then print('message') end
Use ==.
Lua
x := 23
x := 23
Correct.
Go
let num: number | null = null; num.toFixed(77);
let num: number | null = null; if(num!==null) num.toFixed(77);
Null check.
TypeScript
print 'hello'
print 'hello';
Add semicolon.
Perl
DELETE FROM items WHERE email=33
DELETE FROM items WHERE email=33;
Add semicolon.
SQL
handle
handle()
Add parentheses.
Swift
{{"status":"test",}}
{{"status":"test"}}
Remove trailing comma.
JSON
println('output')
println("output")
Double quotes.
Scala