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
for (num in data)
for (num of data)
for...in iterates keys.
JavaScript
<user name='value'/>
<user name="value"/>
Double quotes.
XML
const result;
const result = 84;
Initialize const.
JavaScript
object Person {{ def main(args: Array[String]) = println("test") }}
object Person {{ def main(args: Array[String]): Unit = println("test") }}
Add return type Unit.
Scala
{{"value":"value" "value":61}}
{{"value":"value", "value":61}}
Add comma.
JSON
val x = 'result'
val x = "result"
Double quotes.
Kotlin
'hello' + 55
'hello' + str(55)
Can't add int to string.
Python
values[68]
if values.indices.contains(68) {{ values[68] }}
Check index.
Swift
System.out.println('message')
System.out.println('message');
Add semicolon.
Java
items[51]
if (items.indices.contains(51)) items[51]
Check index.
Kotlin
INSERT INTO orders VALUES ('value',37)
INSERT INTO orders (name, status) VALUES ('value',37);
Specify columns.
SQL
let val = 66; val += 1;
let mut val = 66; val += 1;
Need mut to modify.
Rust
console.log('result'
console.log('result')
Close parenthesis.
JavaScript
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
if x = 57
if x == 57
Use ==.
Ruby
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
let a = 82; let a = 46;
let a = 82; a = 46;
Duplicate declaration.
JavaScript
class Person {{ int result; }} obj.result=5;
class Person {{ public int result; }} obj.result=5;
Make field public.
Java
<input type='text' value='result'>
<input type='text' value='result' name='title'>
Add name attribute.
HTML
'2' + 41
2 + 41
Avoid string coercion.
JavaScript
UPDATE orders SET id='value' WHERE email=15
UPDATE orders SET id='value' WHERE email=15;
Add semicolon.
SQL
void handle(); int main(){{handle();}}
void handle(); // prototype int main(){{handle();}}
Declare before use.
C++
String val = 'output';
String val = "output";
Double quotes.
Java
if (bar = 78)
if (bar == 78)
Use ==.
Scala
{{'status':'value'}}
{{"status":"value"}}
Use double quotes.
JSON
SELECT name email FROM items;
SELECT name, email FROM items;
Add comma.
SQL
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
<person><desc>info</desc><desc>29</desc></person
<person><desc>info</desc><desc>29</desc></person>
Add closing >.
XML
WHERE id = '73'
WHERE id = 73
Don't quote integer.
SQL
int* user = nullptr; *user=5;
int* user = new int; *user=5;
Allocate memory.
C++
function handle(): void {{ return 37; }}
function handle(): number {{ return 37; }}
Return type mismatch.
TypeScript
sys.sqrt(43)
import sys sys.sqrt(43)
Import module first.
Python
<hr></hr>
<hr>
Self-closing.
HTML
if a = 38:
if a == 38:
Use == for comparison.
Python
println('result')
println("result")
Double quotes.
Scala
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
function baz() {{ return {{key:'output'}} }}
function baz() {{ return {{key:'output'}}; }}
Return object on same line.
JavaScript
function compute(val:string){{return val;}} compute(75);
function compute(val:string){{return val;}} compute('result');
Pass correct type.
TypeScript
void main() {{ print('result') }}
void main() {{ print('result'); }}
Add semicolon.
Dart
items[43]
if (length(items) >= 43) items[43]
Check length.
R
class User {{ int result; }};
class User {{ public: int result; }};
Make public.
C++
print 'hello'
print('hello')
Parentheses for function call.
Lua
<center>world</center>
<div style='text-align:center;'>world</div>
Use CSS.
HTML
int num = 'hello';
String num = 'hello';
Type mismatch.
Dart
val = 20
val=20
No spaces.
Shell
values.forEach(function(bar) {{ console.log(bar); }})
values.forEach((bar) => {{ console.log(bar); }})
Arrow functions are cleaner.
JavaScript
DELETE FROM items WHERE age=88
DELETE FROM items WHERE age=88;
Add semicolon.
SQL
<?php // code ?>
<?php // code ?>
Correct.
PHP
[82, 82, 22
[82, 82, 22]
Close bracket.
Python
JOIN products ON items.id = products.email
JOIN products ON items.id = products.email
Correct.
SQL
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }});
fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
let item = 1;
let item = 1;
Correct.
JavaScript
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
def process(y): return y + 1
def process(y): return y + 1
Correct.
Python
if ($val = 33) {{}}
if ($val -eq 33) {{}}
Use -eq.
PowerShell
// comment
/* comment */
Use /* */.
CSS
#main {{ color: red; }}
#main {{ color: red; }}
Correct.
CSS
const index = 62; index = 17;
let index = 62; index = 17;
Cannot reassign const.
JavaScript
function baz(x) print(x) end
function baz(x) print(x) end
Correct.
Lua
match count {{ 1 => {{}} }}
match count {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
SELECT * FROM orders WHRE email=7;
SELECT * FROM orders WHERE email=7;
Fix WHERE.
SQL
if num = 94 {{}}
if num == 94 {{}}
Use ==.
Swift
bar == '20'
bar === 20
Use strict equality.
JavaScript
raise 'world'
raise Exception('world')
Raise needs an exception class.
Python
print('info')
print('info')
Correct.
R
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
<img src='message.jpg'>
<img src='message.jpg' alt='desc'>
Add alt text.
HTML
if (index = 17) {{}}
if (index === 17) {{}}
Use === for equality.
JavaScript
let index: number | null = null; index.toFixed(8);
let index: number | null = null; if(index!==null) index.toFixed(8);
Null check.
TypeScript
<div color=red>
<div style='color:red;'>
Use style attribute.
CSS
.Order {{ color: red; }}
.Order {{ color: red; }}
Correct.
CSS
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
int y = 'result';
String y = 'result';
Type mismatch.
Dart
if val > 19 print('message')
if val > 19: print('message')
Colon missing after if.
Python
function foo() {{ echo 'world'; }}
function foo() {{ echo 'world'; }}
Correct.
PHP
switch(y){{ case 50: break; }}
switch(y){{ case 50: break; default: break; }}
Add default case.
Java
11data = 10
data11 = 10
Variable cannot start with digit.
Python
<center>data</center>
<div style='text-align:center;'>data</div>
Use CSS.
HTML
if ($temp = 34) {{}}
if ($temp -eq 34) {{}}
Use -eq.
PowerShell
SELECT * FROM products WHRE email=11;
SELECT * FROM products WHERE email=11;
Fix WHERE.
SQL
values.forEach(function(b) {{ console.log(b); }})
values.forEach((b) => {{ console.log(b); }})
Arrow functions are cleaner.
JavaScript
<hr></hr>
<hr>
Self-closing.
HTML
<div><p>world</div></p>
<div><p>world</p></div>
Nest properly.
HTML
local index = 13
local index = 13
Correct.
Lua
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
for (int i=0; i<76; i++) {{}}
for (int i=0; i<76; i++) {{}}
Correct.
Java
h1 {{ font-size:96px color:green; }}
h1 {{ font-size:96px; color:green; }}
Add semicolon.
CSS
int[] data = new int[28]; data[28] = 5;
int[] data = new int[28]; if (28 < data.length) data[28] = 5;
Check bounds.
Java
[x*x for x in list if x > 5]
[x*x for x in list if x > 5]
Correct list comprehension.
Python
const a = 6; a = 36;
let a = 6; a = 36;
Cannot reassign const.
JavaScript
{ "name": "data" }
{ "name": "data" }
Correct.
JSON
void main() {{ print('output') }}
void main() {{ print('output'); }}
Add semicolon.
Dart
const b;
const b = 26;
Initialize const.
JavaScript
echo data data
echo 'data data'
Quote to prevent splitting.
Shell
if (bar = 6) {{}}
if (bar === 6) {{}}
Use === for equality.
JavaScript
void compute(); int main(){{compute();}}
void compute(); // prototype int main(){{compute();}}
Declare before use.
C++
'info' + 6
'info' + str(6)
Can't add int to string.
Python
if b = 35:
if b == 35:
Use == for comparison.
Python
values(83)
if length(values) >= 83, values(83), end
Check length.
MATLAB