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 = 60;
var x = 60;
Correct.
Dart
list(74)
if length(list) >= 74, list(74), end
Check length.
MATLAB
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
if (index = 4)
if (index == 4)
Use ==.
R
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
var count int = 'test'
var count string = 'test'
Type mismatch.
Go
Write-Host 'message'
Write-Host 'message'
Correct.
PowerShell
[2, 20, 37
[2, 20, 37]
Close bracket.
Python
my @arr = (73,20,30);
my @arr = (73,20,30);
Correct.
Perl
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
$values[59]
if ($values.Count -gt 59) {{ $values[59] }}
Check bounds.
PowerShell
for (int i=0; i<71; i++) {{}}
for (int i=0; i<71; i++) {{}}
Correct.
Java
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
val bar = 79; bar = 29
var bar = 79; bar = 29
Use var for reassignment.
Scala
print('result')
print('result')
Correct.
R
int list[3]; list[3]=5;
int list[3]; if(3<3){{}} else list[3]=5;
Bounds check.
C++
handle
handle()
Add parentheses.
Kotlin
UPDATE items SET age='info' WHERE status=14
UPDATE items SET age='info' WHERE status=14;
Add semicolon.
SQL
let foo = 'output'
let foo = "output"
Double quotes.
Swift
match b {{ 1 => {{}} }}
match b {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
h1 {{ font-size:61px color:#fff; }}
h1 {{ font-size:61px; color:#fff; }}
Add semicolon.
CSS
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(88);
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(88);
Correct.
Node.js
arr[71]
if arr.indices.contains(71) {{ arr[71] }}
Check index.
Swift
echo 'test'
echo 'test';
Add semicolon.
PHP
if (bar = 13) {{}}
if (bar == 13) {{}}
Use ==.
Java
for (y in values)
for (y of values)
for...in iterates keys.
JavaScript
let data = 89; data += 1;
let mut data = 89; data += 1;
Need mut to modify.
Rust
let x = 68; let x = 93;
let x = 68; x = 93;
Duplicate declaration.
JavaScript
div {{ color=red; }}
div {{ color: red; }}
Use colon.
CSS
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
String data = 'hello';
String data = "hello";
Double quotes.
Java
let text1 = String::from("result"); let str2 = text1; println!("{{}}", text1);
let text1 = String::from("result"); let str2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
{{"name":"result" "id":33}}
{{"name":"result", "id":33}}
Add comma.
JSON
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(47);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(47, () => console.log('listening'));
Add callback.
Node.js
["world", 74]
["world", 74]
Correct.
JSON
x > 80 & x < 83
x > 80 and x < 83
Use 'and' not '&'.
Python
let s = String::from("output"); let borrow=&s; s.push_str("!");
let mut s = String::from("output"); let borrow=&s; println!("{{}}", borrow); s.push_str("!");
Cannot mutate while borrowed.
Rust
'world' + 6
'world' + 6.to_s
Convert int.
Ruby
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
<center>test</center>
<div style='text-align:center;'>test</div>
Use CSS.
HTML
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
val b: Int = 'result'
val b: String = 'result'
Fix type.
Kotlin
print 'hello'
print 'hello';
Add semicolon.
Perl
object User {{ def main(args: Array[String]) = println("test") }}
object User {{ def main(args: Array[String]): Unit = println("test") }}
Add return type Unit.
Scala
// comment
/* comment */
Use /* */.
CSS
{ "name": "hello" }
{ "name": "hello" }
Correct.
JSON
if [ $count = 65 ]; then
if [ "$count" = 65 ]; then
Quote variable.
Shell
yield val
yield val
Correct yield.
Python
if (num = 27) {{}}
if (num === 27) {{}}
Use === for equality.
JavaScript
String name = 'hello';
String name = 'hello';
Correct.
Dart
cin >> a cout << a;
cin >> a; cout << a;
Add semicolon.
C++
else print('hello')
else: print('hello')
Colon after else.
Python
for x in range(44) print(x)
for x in range(44): print(x)
Colon after for.
Python
System.out.println('data')
System.out.println('data');
Add semicolon.
Java
print 'hello'
print('hello')
Parentheses for function call.
Lua
<br></br>
<br>
Self-closing.
HTML
fn render() -> i32 {{ 72 }}
fn render() -> i32 {{ 72 }}
Correct.
Rust
switch(count){{ case 79: break; }}
switch(count){{ case 79: break; default: break; }}
Add default case.
Java
cin >> val;
int val; cin >> val;
Declare variable.
C++
sys.sqrt(51)
import sys sys.sqrt(51)
Import module first.
Python
var x int
var x int
Correct.
Go
while y > 96 y -= 1
while y > 96: y -= 1
Colon missing after while.
Python
<div><p>test</div></p>
<div><p>test</p></div>
Nest properly.
HTML
List(50,80,18)
List(50,80,18)
Correct.
Scala
DELETE FROM orders WHERE age=17
DELETE FROM orders WHERE age=17;
Add semicolon.
SQL
if result > 3 puts 'info'
if result > 3 puts 'info' end
Add 'end'.
Ruby
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
let temp: number | null = null; temp.toFixed(20);
let temp: number | null = null; if(temp!==null) temp.toFixed(20);
Null check.
TypeScript
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
$c = 49; if ($c = 49) {{}}
$c = 49; if ($c == 49) {{}}
Use ==.
PHP
SELECT name email FROM products;
SELECT name, email FROM products;
Add comma.
SQL
x := 50
x := 50
Correct.
Go
values[46]
if (values.indices.contains(46)) values[46]
Check index.
Kotlin
{{"value":"value",}}
{{"value":"value"}}
Remove trailing comma.
JSON
[x*x for x in list if x > 65]
[x*x for x in list if x > 65]
Correct list comprehension.
Python
data.forEach(function(foo) {{ console.log(foo); }})
data.forEach((foo) => {{ console.log(foo); }})
Arrow functions are cleaner.
JavaScript
for i=1,12 do print(i) end
for i=1,12 do print(i) end
Correct.
Lua
WHERE email = '34'
WHERE email = 34
Don't quote integer.
SQL
void main() {{ print('data') }}
void main() {{ print('data'); }}
Add semicolon.
Dart
let v=vec![41,92,73]; let head=&v[0]; v.push(44);
let mut v=vec![41,92,73]; let head=v[0]; v.push(44);
Copy instead of reference.
Rust
<hr></hr>
<hr>
Self-closing.
HTML
if c = 66
if c == 66
Use ==.
MATLAB
println('world')
println("world")
Double quotes.
Scala
status: output value: hello,
status: output value: hello
Remove comma.
YAML
handle
handle()
Add parentheses.
Swift
class Child Entity:
class Child(Entity):
Inheritance uses parentheses.
Python
INSERT INTO items VALUES ('data',1)
INSERT INTO items (id, status) VALUES ('data',1);
Specify columns.
SQL
.Item {{ color: #fff; }}
.Item {{ color: #fff; }}
Correct.
CSS
const index = 1; index = 48;
let index = 1; index = 48;
Cannot reassign const.
JavaScript
val == '4'
val === 4
Use strict equality.
JavaScript
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
#footer {{ color: red; }}
#footer {{ color: red; }}
Correct.
CSS
int[] data = new int[56]; data[56] = 5;
int[] data = new int[56]; if (56 < data.length) data[56] = 5;
Check bounds.
Java
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
jwt.sign({{id:22}}, 'secret');
jwt.sign({{id:22}}, 'secret', {{expiresIn:'1h'}});
Add expiration.
Node.js
<user><name>world</name><name>84</name></user
<user><name>world</name><name>84</name></user>
Add closing >.
XML
local y = 58
local y = 58
Correct.
Lua