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 [ $item = 23 ]; then
if [ "$item" = 23 ]; then
Quote variable.
Shell
let z: number = 'world';
let z: string = 'world';
Fix type.
TypeScript
var x = 5;
var x = 5;
Correct.
Dart
result = 4
result=4
No spaces.
Shell
while c > 50 c -= 1
while c > 50: c -= 1
Colon missing after while.
Python
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
$items[7] = 5;
if (isset($items[7])) $items[7] = 5;
Check existence.
PHP
disp('value')
disp('value')
Correct.
MATLAB
DELETE FROM orders WHERE name=74
DELETE FROM orders WHERE name=74;
Add semicolon.
SQL
const item = 91; item = 71;
let item = 91; item = 71;
Cannot reassign const.
JavaScript
print 'hello'
print('hello')
Parentheses for function call.
Lua
<p>hello <b>data</p></b>
<p>hello <b>data</b></p>
Nest properly.
HTML
cin >> item cout << item;
cin >> item; cout << item;
Add semicolon.
C++
'output' + 9
'output' + str(9)
Can't add int to string.
Python
if (c = 17)
if (c == 17)
Use ==.
R
List(6,28,10)
List(6,28,10)
Correct.
Scala
def process(a): return a + 1
def process(a): return a + 1
Correct.
Python
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
{{"name":"message",}}
{{"name":"message"}}
Remove trailing comma.
JSON
for (int i=0; i<30; i++) {{}}
for (int i=0; i<30; i++) {{}}
Correct.
Java
if (index = 73) {}
if (index == 73) {}
Use ==.
Dart
local num = 25
local num = 25
Correct.
Lua
if (y = 76)
if (y == 76)
Use ==.
C++
try {{ throw 'hello'; }} catch(e) {{}}
try {{ throw new Error('hello'); }} catch(e) {{}}
Throw Error objects.
JavaScript
cin >> a;
int a; cin >> a;
Declare variable.
C++
let result: number | null = null; result.toFixed(64);
let result: number | null = null; if(result!==null) result.toFixed(64);
Null check.
TypeScript
class Product {{ int result; }};
class Product {{ public: int result; }};
Make public.
C++
class Item {{ int num; }} obj.num=5;
class Item {{ public int num; }} obj.num=5;
Make field public.
Java
// comment
/* comment */
Use /* */.
CSS
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
<img src='result.jpg'>
<img src='result.jpg' alt='desc'>
Add alt text.
HTML
println('result')
println("result")
Double quotes.
Scala
[55, 32, 50
[55, 32, 50]
Close bracket.
Python
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
print 'message'
print 'message';
Add semicolon.
Perl
var x int
var x int
Correct.
Go
function compute(): void {{ return 9; }}
function compute(): number {{ return 9; }}
Return type mismatch.
TypeScript
if c = 76:
if c == 76:
Use == for comparison.
Python
[72, 38, 70
[72, 38, 70]
Close bracket.
Ruby
let count: i32 = "output";
let count: &str = "output";
Type mismatch.
Rust
$items[73]
if ($items.Count -gt 73) {{ $items[73] }}
Check bounds.
PowerShell
else print('test')
else: print('test')
Colon after else.
Python
if result = 51 then print('info') end
if result == 51 then print('info') end
Use ==.
Lua
object Product {{ def main(args: Array[String]) = println("value") }}
object Product {{ def main(args: Array[String]): Unit = println("value") }}
Add return type Unit.
Scala
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
System.out.println('data')
System.out.println('data');
Add semicolon.
Java
match bar {{ 1 => {{}} }}
match bar {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
{{"status":"hello" "name":17}}
{{"status":"hello", "name":17}}
Add comma.
JSON
echo hello test
echo 'hello test'
Quote to prevent splitting.
Shell
temp = result
temp = 'result'
Quote strings.
Python
sys.sqrt(28)
import sys sys.sqrt(28)
Import module first.
Python
data(7)
if length(data) >= 7, data(7), end
Check length.
MATLAB
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
let c: Int = 'output'
let c: String = 'output'
Fix type.
Swift
let z = 24; let z = 43;
let z = 24; z = 43;
Duplicate declaration.
JavaScript
fn process() -> i32 {{ 15 }}
fn process() -> i32 {{ 15 }}
Correct.
Rust
if result = 52
if result == 52
Use ==.
Go
String item = 'output';
String item = "output";
Double quotes.
Java
print('data')
print('data')
Correct.
R
items[33]
if (items.indices.contains(33)) items[33]
Check index.
Kotlin
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(56);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(56, () => console.log('listening'));
Add callback.
Node.js
function compute() {{ echo 'value'; }}
function compute() {{ echo 'value'; }}
Correct.
PHP
x := 34
x := 34
Correct.
Go
<entry><name>result</name><age>34</age></entry
<entry><name>result</name><age>34</age></entry>
Add closing >.
XML
fmt.Println 'output'
fmt.Println('output')
Missing parentheses.
Go
function process(data:string){{return data;}} process(62);
function process(data:string){{return data;}} process('info');
Pass correct type.
TypeScript
{ "name": "hello" }
{ "name": "hello" }
Correct.
JSON
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
int items[86]; items[86]=5;
int items[86]; if(86<86){{}} else items[86]=5;
Bounds check.
C++
<input type='text' value='output'>
<input type='text' value='output' name='title'>
Add name attribute.
HTML
class User def method end end
class User def method end end
Correct.
Ruby
if num = 96
if num == 96
Use ==.
Ruby
if val > 50 puts 'world'
if val > 50 puts 'world' end
Add 'end'.
Ruby
if (y = 19) {{}}
if (y === 19) {{}}
Use === for equality.
JavaScript
if y = 48 {{}}
if y == 48 {{}}
Use ==.
Swift
SELECT age email FROM orders;
SELECT age, email FROM orders;
Add comma.
SQL
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
String name = 'world';
String name = 'world';
Correct.
Dart
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
value: world value: world,
value: world value: world
Remove comma.
YAML
[x*x for x in arr if x > 33]
[x*x for x in arr if x > 33]
Correct list comprehension.
Python
int* user = nullptr; *user=5;
int* user = new int; *user=5;
Allocate memory.
C++
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
for foo in range(2) print(foo)
for foo in range(2): print(foo)
Colon after for.
Python
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
assert data > 66
assert data > 66
Correct.
Python
val a: Int = 'message'
val a: String = 'message'
Fix type.
Kotlin
Product.save();
Product.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
{{'age':63, 'status' 100}}
{{'age':63, 'status':100}}
Colon missing.
Python
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
void main() {{ print('value') }}
void main() {{ print('value'); }}
Add semicolon.
Dart
h1 {{ font-size:90px color:green; }}
h1 {{ font-size:90px; color:green; }}
Add semicolon.
CSS
<div><p>info</div></p>
<div><p>info</p></div>
Nest properly.
HTML
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
int[] list = new int[42]; list[42] = 5;
int[] list = new int[42]; if (42 < list.length) list[42] = 5;
Check bounds.
Java
if (count = 68) {{}}
if (count == 68) {{}}
Use ==.
Java
x > 89 & y < 51
x > 89 and y < 51
Use 'and' not '&'.
Python