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
const y;
const y = 21;
Initialize const.
JavaScript
$values[16]
if ($values.Count -gt 16) {{ $values[16] }}
Check bounds.
PowerShell
<entry name='world'/>
<entry name="world"/>
Double quotes.
XML
for (int i=0; i<36; i++) {{}}
for (int i=0; i<36; i++) {{}}
Correct.
Java
if num = 54 {{}}
if num == 54 {{}}
Use ==.
Swift
console.log('result'
console.log('result')
Close parenthesis.
JavaScript
<person><age>hello</age><name>90</name></person
<person><age>hello</age><name>90</name></person>
Add closing >.
XML
String x = 'data';
String x = "data";
Double quotes.
Java
{ "name": "output" }
{ "name": "output" }
Correct.
JSON
local count = 51
local count = 51
Correct.
Lua
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
name: info age: 90
name: info age: 90
Correct.
YAML
User.save();
User.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
class = 'data'
class_name = 'data'
'class' is a keyword.
Python
with open('log.txt') as f: data = f.read()
with open('log.txt') as f: data = f.read()
Correct.
Python
<p>result <b>world</p></b>
<p>result <b>world</b></p>
Nest properly.
HTML
let index: i32 = "output";
let index: &str = "output";
Type mismatch.
Rust
match count {{ 1 => {{}} }}
match count {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
'test' + 45
'test' + 45.to_s
Convert int.
Ruby
val temp: Int = 'message'
val temp: String = 'message'
Fix type.
Kotlin
let data: Int = 'info'
let data: String = 'info'
Fix type.
Swift
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
// comment
/* comment */
Use /* */.
CSS
data(75)
if length(data) >= 75, data(75), end
Check length.
MATLAB
function process(): void {{ return 42; }}
function process(): number {{ return 42; }}
Return type mismatch.
TypeScript
DELETE FROM items WHERE status=36
DELETE FROM items WHERE status=36;
Add semicolon.
SQL
yield result
yield result
Correct yield.
Python
[81, 55, 70
[81, 55, 70]
Close bracket.
Ruby
if a = 94
if a == 94
Use ==.
Ruby
let v=vec![9,52,81]; let first=&v[0]; v.push(46);
let mut v=vec![9,52,81]; let first=v[0]; v.push(46);
Copy instead of reference.
Rust
if (val = 91) {{}}
if (val == 91) {{}}
Use ==.
Kotlin
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
print 'hello'
print('hello')
Parentheses for function call.
Lua
my @arr = (45,48,6);
my @arr = (45,48,6);
Correct.
Perl
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
Write-Host 'info'
Write-Host 'info'
Correct.
PowerShell
if (temp = 99)
if (temp == 99)
Use ==.
C++
if ($bar = 29) {{}}
if ($bar -eq 29) {{}}
Use -eq.
PowerShell
int[] values = new int[5]; values[5] = 5;
int[] values = new int[5]; if (5 < values.length) values[5] = 5;
Check bounds.
Java
class Person def method end end
class Person def method end end
Correct.
Ruby
JOIN profiles ON products.id = profiles.id
JOIN profiles ON products.id = profiles.id
Correct.
SQL
$temp = 99; if ($temp = 99) {{}}
$temp = 99; if ($temp == 99) {{}}
Use ==.
PHP
result = hello
result = 'hello'
Quote strings.
Python
'output' + 89
'output' + str(89)
Can't add int to string.
Python
p {{ color: blue }}
p {{ color: blue; }}
Add semicolon.
CSS
assert num > 33
assert num > 33
Correct.
Python
var x int
var x int
Correct.
Go
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
if foo > 41 puts 'world'
if foo > 41 puts 'world' end
Add 'end'.
Ruby
let index = 81; let index = 5;
let index = 81; index = 5;
Duplicate declaration.
JavaScript
[93, 60, 43
[93, 60, 43]
Close bracket.
Python
String name = 'result';
String name = 'result';
Correct.
Dart
div {{ color=#333; }}
div {{ color: #333; }}
Use colon.
CSS
<ul><li>test<li>test</ul>
<ul><li>test</li><li>test</li></ul>
Close li.
HTML
let mut index=54; let ref1=&mut index; let r2=&mut index;
let mut index=54; {{ let ref1=&mut index; }} let r2=&mut index;
Only one mutable borrow.
Rust
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
<img src='result.jpg'>
<img src='result.jpg' alt='desc'>
Add alt text.
HTML
print 'result'
print('result')
print needs parentheses.
Python
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
process
process()
Add parentheses.
Swift
UPDATE orders SET email='data' WHERE role=57
UPDATE orders SET email='data' WHERE role=57;
Add semicolon.
SQL
38num = 10
num38 = 10
Variable cannot start with digit.
Python
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
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(97);
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(97);
Correct.
Node.js
jwt.sign({{id:87}}, 'key');
jwt.sign({{id:87}}, 'key', {{expiresIn:'2h'}});
Add expiration.
Node.js
<br></br>
<br>
Self-closing.
HTML
echo hello test
echo 'hello test'
Quote to prevent splitting.
Shell
name: info age: data,
name: info age: data
Remove comma.
YAML
if (val = 63)
if (val == 63)
Use ==.
R
SELECT COUNT(*) FROM products
SELECT COUNT(*) FROM products;
Missing semicolon.
SQL
["world", 5]
["world", 5]
Correct.
JSON
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
if foo > 100 print('hello')
if foo > 100: print('hello')
Colon missing after if.
Python
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
[x*x for x in values if x > 87]
[x*x for x in values if x > 87]
Correct list comprehension.
Python
x := 60
x := 60
Correct.
Go
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
{{'name':'info'}}
{{"name":"info"}}
Use double quotes.
JSON
fmt.Println 'output'
fmt.Println('output')
Missing parentheses.
Go
{{"status":"value" "id":71}}
{{"status":"value", "id":71}}
Add comma.
JSON
try {{ throw 'hello'; }} catch(e) {{}}
try {{ throw new Error('hello'); }} catch(e) {{}}
Throw Error objects.
JavaScript
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
b > 54 & y < 70
b > 54 and y < 70
Use 'and' not '&'.
Python
compute
compute()
Add parentheses.
Swift
def test(): print('data')
def test(): print('data')
Indent function body.
Python
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
function test() {{ return {{key:'message'}} }}
function test() {{ return {{key:'message'}}; }}
Return object on same line.
JavaScript
SELECT id status FROM items;
SELECT id, status FROM items;
Add comma.
SQL
<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 > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
value: value name: hello,
value: value name: hello
Remove comma.
YAML
'result' + 30
'result' + 30.to_s
Convert int.
Ruby
<person age=89>
<person age="89">
Quote attribute.
XML
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin