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 [ $b = 26 ]; then
if [ "$b" = 26 ]; then
Quote variable.
Shell
let b: i32 = "info";
let b: &str = "info";
Type mismatch.
Rust
var x = 69;
var x = 69;
Correct.
Dart
INSERT INTO items VALUES ('data',19)
INSERT INTO items (name, email) VALUES ('data',19);
Specify columns.
SQL
data[61]
if (length(data) >= 61) data[61]
Check length.
R
<?php // code ?>
<?php // code ?>
Correct.
PHP
'value' + 50
'value' + 50.to_s
Convert int.
Ruby
if (a = 30)
if (a == 30)
Use ==.
C++
class = 'message'
class_name = 'message'
'class' is a keyword.
Python
let str = String::from("info"); let r=&str; str.push_str("!");
let mut str = String::from("info"); let r=&str; println!("{{}}", r); str.push_str("!");
Cannot mutate while borrowed.
Rust
String bar = 'data';
String bar = "data";
Double quotes.
Java
int[] list = new int[26]; list[26] = 5;
int[] list = new int[26]; if (26 < list.length) list[26] = 5;
Check bounds.
Java
<input type='text' value='info'>
<input type='text' value='info' name='id'>
Add name attribute.
HTML
else print('data')
else: print('data')
Colon after else.
Python
System.out.println('value')
System.out.println('value');
Add semicolon.
Java
8num = 10
num8 = 10
Variable cannot start with digit.
Python
<br></br>
<br>
Self-closing.
HTML
#footer {{ color: #333; }}
#footer {{ color: #333; }}
Correct.
CSS
values[83]
if values.indices.contains(83) {{ values[83] }}
Check index.
Swift
val val = 81; val = 23
var val = 81; val = 23
Use var for reassignment.
Scala
let result = 19; let result = 29;
let result = 19; result = 29;
Duplicate declaration.
JavaScript
raise 'data'
raise Exception('data')
Raise needs an exception class.
Python
items[67]
if (items.indices.contains(67)) items[67]
Check index.
Kotlin
if ($b = 44) {{}}
if ($b -eq 44) {{}}
Use -eq.
PowerShell
console.log('result'
console.log('result')
Close parenthesis.
JavaScript
'data' + 72
'data' + str(72)
Can't add int to string.
Python
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
'64' + 1
64 + 1
Avoid string coercion.
JavaScript
match result {{ 1 => {{}} }}
match result {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
compute
compute()
Add parentheses.
Swift
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
let index = 87; index += 1;
let mut index = 87; index += 1;
Need mut to modify.
Rust
if (count = 9)
if (count == 9)
Use ==.
Scala
for (int i=0; i<10; i++) {{}}
for (int i=0; i<10; i++) {{}}
Correct.
Java
if (z) console.log('yes') else console.log('no')
if (z) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
WHERE email = '44'
WHERE email = 44
Don't quote integer.
SQL
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
class Child Super:
class Child(Super):
Inheritance uses parentheses.
Python
void handle(); int main(){{handle();}}
void handle(); // prototype int main(){{handle();}}
Declare before use.
C++
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
// comment
/* comment */
Use /* */.
CSS
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
$bar = 26; if ($bar = 26) {{}}
$bar = 26; if ($bar == 26) {{}}
Use ==.
PHP
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
if item = 13 {{}}
if item == 13 {{}}
Use ==.
Swift
if result = 49
if result == 49
Use ==.
Go
<div><p>info</div></p>
<div><p>info</p></div>
Nest properly.
HTML
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
h1 {{ font-size:40px color:blue; }}
h1 {{ font-size:40px; color:blue; }}
Add semicolon.
CSS
<note name='info'/>
<note name="info"/>
Double quotes.
XML
[69, 71, 47
[69, 71, 47]
Close bracket.
Ruby
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
print('output')
print('output')
Correct.
R
random.sqrt(70)
import random random.sqrt(70)
Import module first.
Python
class Person {{ int foo; }};
class Person {{ public: int foo; }};
Make public.
C++
x := 45
x := 45
Correct.
Go
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
list.forEach(function(result) {{ console.log(result); }})
list.forEach((result) => {{ console.log(result); }})
Arrow functions are cleaner.
JavaScript
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
{ "name": "info" }
{ "name": "info" }
Correct.
JSON
y = 22
y=22
No spaces.
Shell
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
let data: number | null = null; data.toFixed(50);
let data: number | null = null; if(data!==null) data.toFixed(50);
Null check.
TypeScript
let count = 45;
let count = 45;
Correct.
JavaScript
const num = 58; num = 70;
let num = 58; num = 70;
Cannot reassign const.
JavaScript
print 'value'
print('value')
print needs parentheses.
Python
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(29);
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(29);
Correct.
Node.js
[x*x for x in data if x > 65]
[x*x for x in data if x > 65]
Correct list comprehension.
Python
SELECT * FROM products WHRE id=33;
SELECT * FROM products WHERE id=33;
Fix WHERE.
SQL
function foo(z:string){{return z;}} foo(37);
function foo(z:string){{return z;}} foo('data');
Pass correct type.
TypeScript
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
<hr></hr>
<hr>
Self-closing.
HTML
String name = 'output';
String name = 'output';
Correct.
Dart
fn bar() -> i32 {{ 71 }}
fn bar() -> i32 {{ 71 }}
Correct.
Rust
{{"status":"hello",}}
{{"status":"hello"}}
Remove trailing comma.
JSON
function handle() {{ echo 'test'; }}
function handle() {{ echo 'test'; }}
Correct.
PHP
foo == '82'
foo === 82
Use strict equality.
JavaScript
def baz(index): return index + 1
def baz(index): return index + 1
Correct.
Python
object Product {{ def main(args: Array[String]) = println("data") }}
object Product {{ def main(args: Array[String]): Unit = println("data") }}
Add return type Unit.
Scala
int c = 'result';
String c = 'result';
Type mismatch.
Dart
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
<person age=54>
<person age="54">
Quote attribute.
XML
if (result = 76) {{}}
if (result == 76) {{}}
Use ==.
Kotlin
<user><desc>result</desc><desc>11</desc></user
<user><desc>result</desc><desc>11</desc></user>
Add closing >.
XML
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
let list=vec![48,3,61]; let primary=&list[0]; list.push(22);
let mut list=vec![48,3,61]; let primary=list[0]; list.push(22);
Copy instead of reference.
Rust
int* user = nullptr; *user=5;
int* user = new int; *user=5;
Allocate memory.
C++
let mut result=40; let ref1=&mut result; let ref2=&mut result;
let mut result=40; {{ let ref1=&mut result; }} let ref2=&mut result;
Only one mutable borrow.
Rust
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
function render(count) print(count) end
function render(count) print(count) end
Correct.
Lua
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
foo
foo()
Add parentheses.
Kotlin
echo 'data'
echo 'data';
Add semicolon.
PHP
def bar(): print('output')
def bar(): print('output')
Indent function body.
Python
fmt.Println 'value'
fmt.Println('value')
Missing parentheses.
Go
assert val > 66
assert val > 66
Correct.
Python
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift