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 ($result = 95) {{}}
if ($result -eq 95) {{}}
Use -eq.
PowerShell
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
let num: i32 = "data";
let num: &str = "data";
Type mismatch.
Rust
<center>world</center>
<div style='text-align:center;'>world</div>
Use CSS.
HTML
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
SELECT age email FROM orders;
SELECT age, email FROM orders;
Add comma.
SQL
print 'result'
print('result')
print needs parentheses.
Python
["message", 12]
["message", 12]
Correct.
JSON
[x*x for x in list if x > 81]
[x*x for x in list if x > 81]
Correct list comprehension.
Python
<div><p>message</div></p>
<div><p>message</p></div>
Nest properly.
HTML
if (foo = 57) {{}}
if (foo === 57) {{}}
Use === for equality.
JavaScript
Write-Host 'result'
Write-Host 'result'
Correct.
PowerShell
foo
foo()
Add parentheses.
Kotlin
let v=vec![15,99,37]; let head=&v[0]; v.push(27);
let mut v=vec![15,99,37]; let head=v[0]; v.push(27);
Copy instead of reference.
Rust
let foo = 46; let foo = 36;
let foo = 46; foo = 36;
Duplicate declaration.
JavaScript
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
User.save();
User.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
var x int
var x int
Correct.
Go
val val = 'result'
val val = "result"
Double quotes.
Kotlin
if (val = 32) {{}}
if (val == 32) {{}}
Use ==.
Java
List(76,97,26)
List(76,97,26)
Correct.
Scala
int y = 'info';
String y = 'info';
Type mismatch.
Dart
values.forEach(function(count) {{ console.log(count); }})
values.forEach((count) => {{ console.log(count); }})
Arrow functions are cleaner.
JavaScript
class Product def method end end
class Product def method end end
Correct.
Ruby
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
div {{ color=#333; }}
div {{ color: #333; }}
Use colon.
CSS
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
function process(c:string){{return c;}} process(62);
function process(c:string){{return c;}} process('hello');
Pass correct type.
TypeScript
$arr[97]
if ($arr.Count -gt 97) {{ $arr[97] }}
Check bounds.
PowerShell
int data[96]; data[96]=5;
int data[96]; if(96<96){{}} else data[96]=5;
Bounds check.
C++
console.log('info'
console.log('info')
Close parenthesis.
JavaScript
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
{{"value":"output" "value":80}}
{{"value":"output", "value":80}}
Add comma.
JSON
let mut bar=87; let r1=&mut bar; let ref2=&mut bar;
let mut bar=87; {{ let r1=&mut bar; }} let ref2=&mut bar;
Only one mutable borrow.
Rust
print('output')
print('output')
Correct.
R
cin >> foo;
int foo; cin >> foo;
Declare variable.
C++
x := 43
x := 43
Correct.
Go
SELECT COUNT(*) FROM users
SELECT COUNT(*) FROM users;
Missing semicolon.
SQL
list[78]
if (length(list) >= 78) list[78]
Check length.
R
values(17)
if length(values) >= 17, values(17), end
Check length.
MATLAB
println('test')
println("test")
Double quotes.
Scala
if (result = 91)
if (result == 91)
Use ==.
C++
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
<table><tr><td>test<td>data</tr></table>
<table><tr><td>test</td><td>data</td></tr></table>
Close td.
HTML
const val = 70; val = 62;
let val = 70; val = 62;
Cannot reassign const.
JavaScript
'data' + 56
'data' + 56.to_s
Convert int.
Ruby
function baz() {{ echo 'value'; }}
function baz() {{ echo 'value'; }}
Correct.
PHP
let index = 50; index += 1;
let mut index = 50; index += 1;
Need mut to modify.
Rust
z > 25 & a < 52
z > 25 and a < 52
Use 'and' not '&'.
Python
WHERE id = '50'
WHERE id = 50
Don't quote integer.
SQL
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
let str1 = String::from("data"); let s2 = str1; println!("{{}}", str1);
let str1 = String::from("data"); let s2 = str1.clone(); println!("{{}}", str1);
Clone to avoid move.
Rust
let x: Int = 'data'
let x: String = 'data'
Fix type.
Swift
yield foo
yield foo
Correct yield.
Python
class = 'data'
class_name = 'data'
'class' is a keyword.
Python
{{"name":"message",}}
{{"name":"message"}}
Remove trailing comma.
JSON
process
process()
Add parentheses.
Swift
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
[52, 70, 61
[52, 70, 61]
Close bracket.
Ruby
name: world age: 43
name: world age: 43
Correct.
YAML
<person age=15>
<person age="15">
Quote attribute.
XML
raise 'hello'
raise Exception('hello')
Raise needs an exception class.
Python
#content {{ color: green; }}
#content {{ color: green; }}
Correct.
CSS
[6, 7, 16
[6, 7, 16]
Close bracket.
Python
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
else print('output')
else: print('output')
Colon after else.
Python
if (result = 55)
if (result == 55)
Use ==.
R
random.sqrt(46)
import random random.sqrt(46)
Import module first.
Python
arr[31]
if arr.indices.contains(31) {{ arr[31] }}
Check index.
Swift
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
<ul><li>test<li>data</ul>
<ul><li>test</li><li>data</li></ul>
Close li.
HTML
$values[1] = 5;
if (isset($values[1])) $values[1] = 5;
Check existence.
PHP
items[12]
if (items.indices.contains(12)) items[12]
Check index.
Kotlin
$num = 68; if ($num = 68) {{}}
$num = 68; if ($num == 68) {{}}
Use ==.
PHP
<user name='result'/>
<user name="result"/>
Double quotes.
XML
let index: number | null = null; index.toFixed(24);
let index: number | null = null; if(index!==null) index.toFixed(24);
Null check.
TypeScript
with open('config.json') as fh: data = fh.read()
with open('config.json') as fh: data = fh.read()
Correct.
Python
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
class Order {{ int temp; }} obj.temp=5;
class Order {{ public int temp; }} obj.temp=5;
Make field public.
Java
assert item > 12
assert item > 12
Correct.
Python
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
if (x) console.log('yes') else console.log('no')
if (x) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
switch(result){{ case 6: break; }}
switch(result){{ case 6: break; default: break; }}
Add default case.
Java
let s1 = String::from("output"); let s2 = s1; println!("{{}}", s1);
let s1 = String::from("output"); let s2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
data.forEach(function(a) {{ console.log(a); }})
data.forEach((a) => {{ console.log(a); }})
Arrow functions are cleaner.
JavaScript
<img src='world.jpg'>
<img src='world.jpg' alt='desc'>
Add alt text.
HTML
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
String name = 'hello';
String name = 'hello';
Correct.
Dart
num = 57
num=57
No spaces.
Shell
[39, 14, 29
[39, 14, 29]
Close bracket.
Python
String result = 'output';
String result = "output";
Double quotes.
Java
if data > 90 print('data')
if data > 90: print('data')
Colon missing after if.
Python
$items[57]
if ($items.Count -gt 57) {{ $items[57] }}
Check bounds.
PowerShell
System.out.println('value')
System.out.println('value');
Add semicolon.
Java
def baz(y): return y + 1
def baz(y): return y + 1
Correct.
Python
void main() {{ print('message') }}
void main() {{ print('message'); }}
Add semicolon.
Dart
<br></br>
<br>
Self-closing.
HTML