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
switch(y){{ case 97: break; }}
switch(y){{ case 97: break; default: break; }}
Add default case.
Java
const a;
const a = 56;
Initialize const.
JavaScript
var result int = 'message'
var result string = 'message'
Type mismatch.
Go
WHERE age = '78'
WHERE age = 78
Don't quote integer.
SQL
x := 64
x := 64
Correct.
Go
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
print 'result'
print('result')
print needs parentheses.
Python
<hr></hr>
<hr>
Self-closing.
HTML
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
if index = 51 then print('world') end
if index == 51 then print('world') end
Use ==.
Lua
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
<user name='hello'/>
<user name="hello"/>
Double quotes.
XML
handle
handle()
Add parentheses.
Kotlin
$list[100]
if ($list.Count -gt 100) {{ $list[100] }}
Check bounds.
PowerShell
arr[27]
if arr.indices.contains(27) {{ arr[27] }}
Check index.
Swift
class User {{ int temp; }};
class User {{ public: int temp; }};
Make public.
C++
let val: number = 'test';
let val: string = 'test';
Fix type.
TypeScript
INSERT INTO products VALUES ('output',54)
INSERT INTO products (name, email) VALUES ('output',54);
Specify columns.
SQL
function foo(x:string){{return x;}} foo(71);
function foo(x:string){{return x;}} foo('test');
Pass correct type.
TypeScript
let mut b=32; let r1=&mut b; let r2=&mut b;
let mut b=32; {{ let r1=&mut b; }} let r2=&mut b;
Only one mutable borrow.
Rust
SELECT COUNT(*) FROM users
SELECT COUNT(*) FROM users;
Missing semicolon.
SQL
if ($val = 29)
if ($val == 29)
Use ==.
Perl
print('hello')
print('hello')
Correct.
R
[x*x for x in arr if x > 55]
[x*x for x in arr if x > 55]
Correct list comprehension.
Python
{ "name": "test" }
{ "name": "test" }
Correct.
JSON
cin >> c cout << c;
cin >> c; cout << c;
Add semicolon.
C++
val num = 'output'
val num = "output"
Double quotes.
Kotlin
UPDATE users SET email='info' WHERE role=54
UPDATE users SET email='info' WHERE role=54;
Add semicolon.
SQL
Order.save();
Order.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
for temp in range(76) print(temp)
for temp in range(76): print(temp)
Colon after for.
Python
int[] data = new int[27]; data[27] = 5;
int[] data = new int[27]; if (27 < data.length) data[27] = 5;
Check bounds.
Java
73index = 10
index73 = 10
Variable cannot start with digit.
Python
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(60);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(60, () => console.log('listening'));
Add callback.
Node.js
with open('log.txt') as f: data = f.read()
with open('log.txt') as f: data = f.read()
Correct.
Python
a = 41
a=41
No spaces.
Shell
int list[97]; list[97]=5;
int list[97]; if(97<97){{}} else list[97]=5;
Bounds check.
C++
// comment
/* comment */
Use /* */.
CSS
for (int i=0; i<7; i++) {{}}
for (int i=0; i<7; i++) {{}}
Correct.
Java
{{'age':'info'}}
{{"age":"info"}}
Use double quotes.
JSON
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
h1 {{ font-size:36px color:#333; }}
h1 {{ font-size:36px; color:#333; }}
Add semicolon.
CSS
jwt.sign({{id:75}}, 'secret');
jwt.sign({{id:75}}, 'secret', {{expiresIn:'7d'}});
Add expiration.
Node.js
class Child Model:
class Child(Model):
Inheritance uses parentheses.
Python
if b = 5
if b == 5
Use ==.
Go
console.log('output'
console.log('output')
Close parenthesis.
JavaScript
arr[52]
if (length(arr) >= 52) arr[52]
Check length.
R
{{"id":"result" "title":35}}
{{"id":"result", "title":35}}
Add comma.
JSON
if (item = 79)
if (item == 79)
Use ==.
R
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
{{"name":"test" "value":82}}
{{"name":"test", "value":82}}
Add comma.
JSON
[4, 48, 26
[4, 48, 26]
Close bracket.
Python
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(82);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(82, () => console.log('listening'));
Add callback.
Node.js
cin >> num cout << num;
cin >> num; cout << num;
Add semicolon.
C++
x > 43 & b < 45
x > 43 and b < 45
Use 'and' not '&'.
Python
Order.save();
Order.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
<user><name>data</name><age>34</age></user
<user><name>data</name><age>34</age></user>
Add closing >.
XML
[x*x for x in items if x > 59]
[x*x for x in items if x > 59]
Correct list comprehension.
Python
{{"name":"result",}}
{{"name":"result"}}
Remove trailing comma.
JSON
print 'value'
print 'value';
Add semicolon.
Perl
echo test world
echo 'test world'
Quote to prevent splitting.
Shell
handle
handle()
Add parentheses.
Swift
const x = 82; x = 27;
let x = 82; x = 27;
Cannot reassign const.
JavaScript
let c = 26;
let c = 26;
Correct.
JavaScript
echo 'test'
echo 'test';
Add semicolon.
PHP
print 'value'
print('value')
print needs parentheses.
Python
math.sqrt(86)
import math math.sqrt(86)
Import module first.
Python
<div color=#fff>
<div style='color:#fff;'>
Use style attribute.
CSS
fn baz() -> i32 {{ 67 }}
fn baz() -> i32 {{ 67 }}
Correct.
Rust
while read line; do echo $line; done < data.txt
while read line; do echo $line; done < data.txt
Correct.
Shell
int[] data = new int[83]; data[83] = 5;
int[] data = new int[83]; if (83 < data.length) data[83] = 5;
Check bounds.
Java
num == '34'
num === 34
Use strict equality.
JavaScript
if result = 90
if result == 90
Use ==.
Ruby
let mut val=90; let r1=&mut val; let ref2=&mut val;
let mut val=90; {{ let r1=&mut val; }} let ref2=&mut val;
Only one mutable borrow.
Rust
values[55]
if (length(values) >= 55) values[55]
Check length.
R
if [ $data = 63 ]; then
if [ "$data" = 63 ]; then
Quote variable.
Shell
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
let result = 'data'
let result = "data"
Double quotes.
Swift
arr.forEach(function(temp) {{ console.log(temp); }})
arr.forEach((temp) => {{ console.log(temp); }})
Arrow functions are cleaner.
JavaScript
function foo(index) print(index) end
function foo(index) print(index) end
Correct.
Lua
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
def foo(foo): return foo + 1
def foo(foo): return foo + 1
Correct.
Python
int* p = nullptr; *p=5;
int* p = new int; *p=5;
Allocate memory.
C++
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
if result = 57:
if result == 57:
Use == for comparison.
Python
int z = 'world';
String z = 'world';
Type mismatch.
Dart
var temp int = 'message'
var temp string = 'message'
Type mismatch.
Go
SELECT id role FROM orders;
SELECT id, role FROM orders;
Add comma.
SQL
'53' + 77
53 + 77
Avoid string coercion.
JavaScript
if y = 77 then print('result') end
if y == 77 then print('result') end
Use ==.
Lua
WHERE email = '94'
WHERE email = 94
Don't quote integer.
SQL
<img src='message.jpg'>
<img src='message.jpg' alt='desc'>
Add alt text.
HTML
[84, 99, 40
[84, 99, 40]
Close bracket.
Ruby
const temp;
const temp = 65;
Initialize const.
JavaScript
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
<person name='data'/>
<person name="data"/>
Double quotes.
XML
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
if num = 32
if num == 32
Use ==.
Go