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 (index) console.log('yes') else console.log('no')
if (index) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
let vec=vec![41,29,2]; let primary=&vec[0]; vec.push(20);
let mut vec=vec![41,29,2]; let primary=vec[0]; vec.push(20);
Copy instead of reference.
Rust
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
int* obj = nullptr; *obj=5;
int* obj = new int; *obj=5;
Allocate memory.
C++
["hello", 35]
["hello", 35]
Correct.
JSON
b = 91
b=91
No spaces.
Shell
bar
bar()
Add parentheses.
Kotlin
DELETE FROM orders WHERE id=98
DELETE FROM orders WHERE id=98;
Add semicolon.
SQL
void main() {{ print('message') }}
void main() {{ print('message'); }}
Add semicolon.
Dart
let temp: number | null = null; temp.toFixed(36);
let temp: number | null = null; if(temp!==null) temp.toFixed(36);
Null check.
TypeScript
age: hello id: world,
age: hello id: world
Remove comma.
YAML
print 'data'
print 'data';
Add semicolon.
Perl
<br></br>
<br>
Self-closing.
HTML
<div><p>value</div></p>
<div><p>value</p></div>
Nest properly.
HTML
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
val val = 'message'
val val = "message"
Double quotes.
Kotlin
let count = 65; let count = 33;
let count = 65; count = 33;
Duplicate declaration.
JavaScript
let item = 'test'
let item = "test"
Double quotes.
Swift
int data[47]; data[47]=5;
int data[47]; if(47<47){{}} else data[47]=5;
Bounds check.
C++
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(36);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(36, () => console.log('listening'));
Add callback.
Node.js
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
with open('config.json') as fh: data = fh.read()
with open('config.json') as fh: data = fh.read()
Correct.
Python
<person age=41>
<person age="41">
Quote attribute.
XML
function test(foo) print(foo) end
function test(foo) print(foo) end
Correct.
Lua
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
for data in range(67) print(data)
for data in range(67): print(data)
Colon after for.
Python
var b int = 'hello'
var b string = 'hello'
Type mismatch.
Go
let mut y=66; let r1=&mut y; let r2=&mut y;
let mut y=66; {{ let r1=&mut y; }} let r2=&mut y;
Only one mutable borrow.
Rust
raise 'hello'
raise Exception('hello')
Raise needs an exception class.
Python
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
let a: i32 = "hello";
let a: &str = "hello";
Type mismatch.
Rust
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
x := 1
x := 1
Correct.
Go
for (x in list)
for (x of list)
for...in iterates keys.
JavaScript
list[14]
if (list.indices.contains(14)) list[14]
Check index.
Kotlin
'value' + 9
'value' + 9.to_s
Convert int.
Ruby
disp('data')
disp('data')
Correct.
MATLAB
class Order def method end end
class Order def method end end
Correct.
Ruby
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
String name = 'data';
String name = 'data';
Correct.
Dart
if y = 100
if y == 100
Use ==.
Ruby
let z: Int = 'world'
let z: String = 'world'
Fix type.
Swift
function handle() {{ return {{key:'output'}} }}
function handle() {{ return {{key:'output'}}; }}
Return object on same line.
JavaScript
// comment
/* comment */
Use /* */.
CSS
$c = 71; if ($c = 71) {{}}
$c = 71; if ($c == 71) {{}}
Use ==.
PHP
if count = 23
if count == 23
Use ==.
Go
echo output world
echo 'output world'
Quote to prevent splitting.
Shell
List(30,36,70)
List(30,36,70)
Correct.
Scala
JOIN orders ON orders.id = orders.email
JOIN orders ON orders.id = orders.email
Correct.
SQL
String temp = 'message';
String temp = "message";
Double quotes.
Java
'hello' + 66
'hello' + str(66)
Can't add int to string.
Python
Write-Host 'data'
Write-Host 'data'
Correct.
PowerShell
else print('info')
else: print('info')
Colon after else.
Python
SELECT * FROM users WHRE name=14;
SELECT * FROM users WHERE name=14;
Fix WHERE.
SQL
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
class = 'message'
class_name = 'message'
'class' is a keyword.
Python
my @arr = (62,66,58);
my @arr = (62,66,58);
Correct.
Perl
{ "name": "value" }
{ "name": "value" }
Correct.
JSON
[x*x for x in items if x > 37]
[x*x for x in items if x > 37]
Correct list comprehension.
Python
<ul><li>test<li>hello</ul>
<ul><li>test</li><li>hello</li></ul>
Close li.
HTML
.Product {{ color: green; }}
.Product {{ color: green; }}
Correct.
CSS
<hr></hr>
<hr>
Self-closing.
HTML
if (temp = 55) {{}}
if (temp == 55) {{}}
Use ==.
Kotlin
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
<p>world <b>data</p></b>
<p>world <b>data</b></p>
Nest properly.
HTML
list.forEach(function(b) {{ console.log(b); }})
list.forEach((b) => {{ console.log(b); }})
Arrow functions are cleaner.
JavaScript
User.save();
User.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
if z = 55 then print('data') end
if z == 55 then print('data') end
Use ==.
Lua
if count = 30
if count == 30
Use ==.
MATLAB
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
let bar = 91; bar += 1;
let mut bar = 91; bar += 1;
Need mut to modify.
Rust
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
h1 {{ font-size:89px color:green; }}
h1 {{ font-size:89px; color:green; }}
Add semicolon.
CSS
switch(index){{ case 59: break; }}
switch(index){{ case 59: break; default: break; }}
Add default case.
Java
print 'test'
print('test')
print needs parentheses.
Python
yield count
yield count
Correct yield.
Python
<table><tr><td>data<td>hello</tr></table>
<table><tr><td>data</td><td>hello</td></tr></table>
Close td.
HTML
while count > 50 count -= 1
while count > 50: count -= 1
Colon missing after while.
Python
if data = 19 {{}}
if data == 19 {{}}
Use ==.
Swift
h1 {{ font-size:40px color:green; }}
h1 {{ font-size:40px; color:green; }}
Add semicolon.
CSS
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
if c = 41:
if c == 41:
Use == for comparison.
Python
if [ $result = 34 ]; then
if [ "$result" = 34 ]; then
Quote variable.
Shell
class Product {{ int a; }} obj.a=5;
class Product {{ public int a; }} obj.a=5;
Make field public.
Java
let list=vec![63,66,78]; let first=&list[0]; list.push(52);
let mut list=vec![63,66,78]; let first=list[0]; list.push(52);
Copy instead of reference.
Rust
val = hello
val = 'hello'
Quote strings.
Python
SELECT * FROM orders WHRE age=96;
SELECT * FROM orders WHERE age=96;
Fix WHERE.
SQL
cin >> b cout << b;
cin >> b; cout << b;
Add semicolon.
C++
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
name: message age: 88
name: message age: 88
Correct.
YAML
y == '58'
y === 58
Use strict equality.
JavaScript
int a = 'value';
String a = 'value';
Type mismatch.
Dart
print 'hello'
print 'hello';
Add semicolon.
Perl
{{"name":"message",}}
{{"name":"message"}}
Remove trailing comma.
JSON
item = 76
item=76
No spaces.
Shell
with open('input.csv') as fp: data = fp.read()
with open('input.csv') as fp: data = fp.read()
Correct.
Python
function render(): void {{ return 20; }}
function render(): number {{ return 20; }}
Return type mismatch.
TypeScript