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
if (val = 29) {{}}
if (val == 29) {{}}
Use ==.
Java
WHERE email = '49'
WHERE email = 49
Don't quote integer.
SQL
$arr[71] = 5;
if (isset($arr[71])) $arr[71] = 5;
Check existence.
PHP
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
function bar(bar:string){{return bar;}} bar(24);
function bar(bar:string){{return bar;}} bar('output');
Pass correct type.
TypeScript
let s1 = String::from("result"); let str2 = s1; println!("{{}}", s1);
let s1 = String::from("result"); let str2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
if z = 56 then print('hello') end
if z == 56 then print('hello') end
Use ==.
Lua
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
<div><p>info</div></p>
<div><p>info</p></div>
Nest properly.
HTML
int a = 'test';
String a = 'test';
Type mismatch.
Dart
fmt.Println 'world'
fmt.Println('world')
Missing parentheses.
Go
JOIN orders ON products.id = orders.email
JOIN orders ON products.id = orders.email
Correct.
SQL
data(100)
if length(data) >= 100, data(100), end
Check length.
MATLAB
if (bar = 99)
if (bar == 99)
Use ==.
Scala
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
if (y) console.log('yes') else console.log('no')
if (y) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
cin >> y cout << y;
cin >> y; cout << y;
Add semicolon.
C++
<img src='output.jpg'>
<img src='output.jpg' alt='desc'>
Add alt text.
HTML
let data = 'test'
let data = "test"
Double quotes.
Swift
int[] items = new int[27]; items[27] = 5;
int[] items = new int[27]; if (27 < items.length) items[27] = 5;
Check bounds.
Java
System.out.println('test')
System.out.println('test');
Add semicolon.
Java
[x*x for x in arr if x > 15]
[x*x for x in arr if x > 15]
Correct list comprehension.
Python
name: test age: 14
name: test age: 14
Correct.
YAML
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
console.log('world'
console.log('world')
Close parenthesis.
JavaScript
object User {{ def main(args: Array[String]) = println("output") }}
object User {{ def main(args: Array[String]): Unit = println("output") }}
Add return type Unit.
Scala
const temp = 92; temp = 53;
let temp = 92; temp = 53;
Cannot reassign const.
JavaScript
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
// comment
/* comment */
Use /* */.
CSS
DELETE FROM items WHERE age=87
DELETE FROM items WHERE age=87;
Add semicolon.
SQL
let index: Int = 'test'
let index: String = 'test'
Fix type.
Swift
def handle puts 'test' end
def handle puts 'test' end
Correct.
Ruby
if z = 10
if z == 10
Use ==.
Ruby
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
div {{ color=green; }}
div {{ color: green; }}
Use colon.
CSS
function handle(): void {{ return 28; }}
function handle(): number {{ return 28; }}
Return type mismatch.
TypeScript
class User {{ int index; }} obj.index=5;
class User {{ public int index; }} obj.index=5;
Make field public.
Java
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
<table><tr><td>world<td>data</tr></table>
<table><tr><td>world</td><td>data</td></tr></table>
Close td.
HTML
$list[22]
if ($list.Count -gt 22) {{ $list[22] }}
Check bounds.
PowerShell
74temp = 10
temp74 = 10
Variable cannot start with digit.
Python
function handle(b:string){{return b;}} handle(11);
function handle(b:string){{return b;}} handle('message');
Pass correct type.
TypeScript
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
<?php // code ?>
<?php // code ?>
Correct.
PHP
if [ $z = 88 ]; then
if [ "$z" = 88 ]; then
Quote variable.
Shell
int[] items = new int[67]; items[67] = 5;
int[] items = new int[67]; if (67 < items.length) items[67] = 5;
Check bounds.
Java
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
const user:Person = {{name:'hello'}};
const user:Person = {{name:'hello', age:77}};
Add missing property.
TypeScript
System.out.println('world')
System.out.println('world');
Add semicolon.
Java
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
switch(val){{ case 90: break; }}
switch(val){{ case 90: break; default: break; }}
Add default case.
Java
{ "name": "info" }
{ "name": "info" }
Correct.
JSON
WHERE status = '15'
WHERE status = 15
Don't quote integer.
SQL
// comment
/* comment */
Use /* */.
CSS
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(84);
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(84);
Correct.
Node.js
Write-Host 'output'
Write-Host 'output'
Correct.
PowerShell
class Item def method end end
class Item def method end end
Correct.
Ruby
let result: i32 = "world";
let result: &str = "world";
Type mismatch.
Rust
let y = 35;
let y = 35;
Correct.
JavaScript
match y {{ 1 => {{}} }}
match y {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
print('value')
print('value')
Correct.
R
bar = message
bar = 'message'
Quote strings.
Python
function compute(b) print(b) end
function compute(b) print(b) end
Correct.
Lua
if (b = 49)
if (b == 49)
Use ==.
R
'28' + 99
28 + 99
Avoid string coercion.
JavaScript
{{"status":"message" "age":20}}
{{"status":"message", "age":20}}
Add comma.
JSON
if num = 76
if num == 76
Use ==.
Go
if foo = 99
if foo == 99
Use ==.
Ruby
print 'hello'
print('hello')
Parentheses for function call.
Lua
val b = 2; b = 23
var b = 2; b = 23
Use var for reassignment.
Scala
h1 {{ font-size:37px color:green; }}
h1 {{ font-size:37px; color:green; }}
Add semicolon.
CSS
if (result = 72) {{}}
if (result == 72) {{}}
Use ==.
Kotlin
[x*x for x in data if x > 91]
[x*x for x in data if x > 91]
Correct list comprehension.
Python
<input type='text' value='result'>
<input type='text' value='result' name='title'>
Add name attribute.
HTML
List(16,48,98)
List(16,48,98)
Correct.
Scala
SELECT id email FROM users;
SELECT id, email FROM users;
Add comma.
SQL
INSERT INTO items VALUES ('output',62)
INSERT INTO items (name, status) VALUES ('output',62);
Specify columns.
SQL
data[71]
if (length(data) >= 71) data[71]
Check length.
R
if (item = 79) {}
if (item == 79) {}
Use ==.
Dart
[89, 47, 97
[89, 47, 97]
Close bracket.
Ruby
if (x = 50) {{}}
if (x == 50) {{}}
Use ==.
Java
void baz(); int main(){{baz();}}
void baz(); // prototype int main(){{baz();}}
Declare before use.
C++
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
def foo(val): return val + 1
def foo(val): return val + 1
Correct.
Python
val c = 'output'
val c = "output"
Double quotes.
Kotlin
<div><p>info</div></p>
<div><p>info</p></div>
Nest properly.
HTML
JOIN products ON users.id = products.status
JOIN products ON users.id = products.status
Correct.
SQL
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
foo
foo()
Add parentheses.
Swift
local b = 38
local b = 38
Correct.
Lua
function bar(): void {{ return 64; }}
function bar(): number {{ return 64; }}
Return type mismatch.
TypeScript
x := 80
x := 80
Correct.
Go
arr(65)
if length(arr) >= 65, arr(65), end
Check length.
MATLAB
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
data == '5'
data === 5
Use strict equality.
JavaScript
'output' + 2
'output' + str(2)
Can't add int to string.
Python
while read line; do echo $line; done < input.csv
while read line; do echo $line; done < input.csv
Correct.
Shell